merge from trunk r1617527

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/fs-encryption@1617532 13f79535-47bb-0310-9956-ffa450edef68

BUILDING.txt

@@ -210,6 +210,7 @@ Requirements:
 * Maven 3.0 or later
 * Findbugs 1.3.9 (if running findbugs)
 * ProtocolBuffer 2.5.0
+* CMake 2.6 or newer
 * Windows SDK or Visual Studio 2010 Professional
 * Unix command-line tools from GnuWin32 or Cygwin: sh, mkdir, rm, cp, tar, gzip
 * zlib headers (if building native code bindings for zlib)

hadoop-common-project/hadoop-auth/pom.xml

@@ -144,6 +144,15 @@
         <artifactId>maven-jar-plugin</artifactId>
         <executions>
           <execution>
+            <id>prepare-jar</id>
+            <phase>prepare-package</phase>
+            <goals>
+              <goal>jar</goal>
+            </goals>
+          </execution>
+          <execution>
+            <id>prepare-test-jar</id>
+            <phase>prepare-package</phase>
             <goals>
               <goal>test-jar</goal>
             </goals>

hadoop-common-project/hadoop-auth/src/main/java/org/apache/hadoop/security/authentication/client/AuthenticatedURL.java

@@ -120,32 +120,6 @@ public class AuthenticatedURL {
       return token;
     }
 
-    /**
-     * Return the hashcode for the token.
-     *
-     * @return the hashcode for the token.
-     */
-    @Override
-    public int hashCode() {
-      return (token != null) ? token.hashCode() : 0;
-    }
-
-    /**
-     * Return if two token instances are equal.
-     *
-     * @param o the other token instance.
-     *
-     * @return if this instance and the other instance are equal.
-     */
-    @Override
-    public boolean equals(Object o) {
-      boolean eq = false;
-      if (o instanceof Token) {
-        Token other = (Token) o;
-        eq = (token == null && other.token == null) || (token != null && this.token.equals(other.token));
-      }
-      return eq;
-    }
   }
 
   private static Class<? extends Authenticator> DEFAULT_AUTHENTICATOR = KerberosAuthenticator.class;
@@ -208,6 +182,16 @@ public class AuthenticatedURL {
     this.authenticator.setConnectionConfigurator(connConfigurator);
   }
 
+  /**
+   * Returns the {@link Authenticator} instance used by the
+   * <code>AuthenticatedURL</code>.
+   *
+   * @return the {@link Authenticator} instance
+   */
+  protected Authenticator getAuthenticator() {
+    return authenticator;
+  }
+
   /**
    * Returns an authenticated {@link HttpURLConnection}.
    *

hadoop-common-project/hadoop-auth/src/main/java/org/apache/hadoop/security/authentication/server/AuthenticationFilter.java

@@ -127,6 +127,7 @@ public class AuthenticationFilter implements Filter {
   public static final String SIGNATURE_PROVIDER_ATTRIBUTE =
       "org.apache.hadoop.security.authentication.util.SignerSecretProvider";
 
+  private Properties config;
   private Signer signer;
   private SignerSecretProvider secretProvider;
   private AuthenticationHandler authHandler;
@@ -150,7 +151,7 @@ public class AuthenticationFilter implements Filter {
   public void init(FilterConfig filterConfig) throws ServletException {
     String configPrefix = filterConfig.getInitParameter(CONFIG_PREFIX);
     configPrefix = (configPrefix != null) ? configPrefix + "." : "";
-    Properties config = getConfiguration(configPrefix, filterConfig);
+    config = getConfiguration(configPrefix, filterConfig);
     String authHandlerName = config.getProperty(AUTH_TYPE, null);
     String authHandlerClassName;
     if (authHandlerName == null) {
@@ -224,6 +225,17 @@ public class AuthenticationFilter implements Filter {
     cookiePath = config.getProperty(COOKIE_PATH, null);
   }
 
+  /**
+   * Returns the configuration properties of the {@link AuthenticationFilter}
+   * without the prefix. The returned properties are the same that the
+   * {@link #getConfiguration(String, FilterConfig)} method returned.
+   *
+   * @return the configuration properties.
+   */
+  protected Properties getConfiguration() {
+    return config;
+  }
+
   /**
    * Returns the authentication handler being used.
    *
@@ -457,7 +469,7 @@ public class AuthenticationFilter implements Filter {
             createAuthCookie(httpResponse, signedToken, getCookieDomain(),
                     getCookiePath(), token.getExpires(), isHttps);
           }
-          filterChain.doFilter(httpRequest, httpResponse);
+          doFilter(filterChain, httpRequest, httpResponse);
         }
       } else {
         unauthorizedResponse = false;
@@ -481,6 +493,15 @@ public class AuthenticationFilter implements Filter {
     }
   }
 
+  /**
+   * Delegates call to the servlet filter chain. Sub-classes my override this
+   * method to perform pre and post tasks.
+   */
+  protected void doFilter(FilterChain filterChain, HttpServletRequest request,
+      HttpServletResponse response) throws IOException, ServletException {
+    filterChain.doFilter(request, response);
+  }
+
   /**
    * Creates the Hadoop authentication HTTP cookie.
    *

hadoop-common-project/hadoop-auth/src/main/java/org/apache/hadoop/security/authentication/server/KerberosAuthenticationHandler.java

@@ -142,11 +142,30 @@ public class KerberosAuthenticationHandler implements AuthenticationHandler {
    */
   public static final String NAME_RULES = TYPE + ".name.rules";
 
+  private String type;
   private String keytab;
   private GSSManager gssManager;
   private Subject serverSubject = new Subject();
   private List<LoginContext> loginContexts = new ArrayList<LoginContext>();
 
+  /**
+   * Creates a Kerberos SPNEGO authentication handler with the default
+   * auth-token type, <code>kerberos</code>.
+   */
+  public KerberosAuthenticationHandler() {
+    this(TYPE);
+  }
+
+  /**
+   * Creates a Kerberos SPNEGO authentication handler with a custom auth-token
+   * type.
+   *
+   * @param type auth-token type.
+   */
+  public KerberosAuthenticationHandler(String type) {
+    this.type = type;
+  }
+
   /**
    * Initializes the authentication handler instance.
    * <p/>
@@ -249,7 +268,7 @@ public class KerberosAuthenticationHandler implements AuthenticationHandler {
    */
   @Override
   public String getType() {
-    return TYPE;
+    return type;
   }
 
   /**

hadoop-common-project/hadoop-auth/src/main/java/org/apache/hadoop/security/authentication/server/PseudoAuthenticationHandler.java

@@ -55,6 +55,25 @@ public class PseudoAuthenticationHandler implements AuthenticationHandler {
 
   private static final Charset UTF8_CHARSET = Charset.forName("UTF-8");
   private boolean acceptAnonymous;
+  private String type;
+
+  /**
+   * Creates a Hadoop pseudo authentication handler with the default auth-token
+   * type, <code>simple</code>.
+   */
+  public PseudoAuthenticationHandler() {
+    this(TYPE);
+  }
+
+  /**
+   * Creates a Hadoop pseudo authentication handler with a custom auth-token
+   * type.
+   *
+   * @param type auth-token type.
+   */
+  public PseudoAuthenticationHandler(String type) {
+    this.type = type;
+  }
 
   /**
    * Initializes the authentication handler instance.
@@ -96,7 +115,7 @@ public class PseudoAuthenticationHandler implements AuthenticationHandler {
    */
   @Override
   public String getType() {
-    return TYPE;
+    return type;
   }
 
   /**

hadoop-common-project/hadoop-auth/src/test/java/org/apache/hadoop/security/authentication/client/TestAuthenticatedURL.java

@@ -33,36 +33,6 @@ public class TestAuthenticatedURL {
     token = new AuthenticatedURL.Token("foo");
     Assert.assertTrue(token.isSet());
     Assert.assertEquals("foo", token.toString());
-
-    AuthenticatedURL.Token token1 = new AuthenticatedURL.Token();
-    AuthenticatedURL.Token token2 = new AuthenticatedURL.Token();
-    Assert.assertEquals(token1.hashCode(), token2.hashCode());
-    Assert.assertTrue(token1.equals(token2));
-
-    token1 = new AuthenticatedURL.Token();
-    token2 = new AuthenticatedURL.Token("foo");
-    Assert.assertNotSame(token1.hashCode(), token2.hashCode());
-    Assert.assertFalse(token1.equals(token2));
-
-    token1 = new AuthenticatedURL.Token("foo");
-    token2 = new AuthenticatedURL.Token();
-    Assert.assertNotSame(token1.hashCode(), token2.hashCode());
-    Assert.assertFalse(token1.equals(token2));
-
-    token1 = new AuthenticatedURL.Token("foo");
-    token2 = new AuthenticatedURL.Token("foo");
-    Assert.assertEquals(token1.hashCode(), token2.hashCode());
-    Assert.assertTrue(token1.equals(token2));
-
-    token1 = new AuthenticatedURL.Token("bar");
-    token2 = new AuthenticatedURL.Token("foo");
-    Assert.assertNotSame(token1.hashCode(), token2.hashCode());
-    Assert.assertFalse(token1.equals(token2));
-
-    token1 = new AuthenticatedURL.Token("foo");
-    token2 = new AuthenticatedURL.Token("bar");
-    Assert.assertNotSame(token1.hashCode(), token2.hashCode());
-    Assert.assertFalse(token1.equals(token2));
   }
 
   @Test
@@ -137,4 +107,12 @@ public class TestAuthenticatedURL {
     Mockito.verify(connConf).configure(Mockito.<HttpURLConnection>any());
   }
 
+  @Test
+  public void testGetAuthenticator() throws Exception {
+    Authenticator authenticator = Mockito.mock(Authenticator.class);
+
+    AuthenticatedURL aURL = new AuthenticatedURL(authenticator);
+    Assert.assertEquals(authenticator, aURL.getAuthenticator());
+  }
+
 }

hadoop-common-project/hadoop-common/CHANGES.txt

@@ -199,6 +199,9 @@ Trunk (Unreleased)
 
     HADOOP-10936. Change default KeyProvider bitlength to 128. (wang)
 
+    HADOOP-10224. JavaKeyStoreProvider has to protect against corrupting 
+    underlying store. (asuresh via tucu)
+
   BUG FIXES
 
     HADOOP-9451. Fault single-layer config if node group topology is enabled.
@@ -421,6 +424,9 @@ Trunk (Unreleased)
     HADOOP-10939. Fix TestKeyProviderFactory testcases to use default 128 bit
     length keys. (Arun Suresh via wang)
 
+    HADOOP-10862. Miscellaneous trivial corrections to KMS classes. 
+    (asuresh via tucu)
+
   OPTIMIZATIONS
 
     HADOOP-7761. Improve the performance of raw comparisons. (todd)
@@ -490,6 +496,12 @@ Release 2.6.0 - UNRELEASED
     HADOOP-10791. AuthenticationFilter should support externalizing the 
     secret for signing and provide rotation support. (rkanter via tucu)
 
+    HADOOP-10771. Refactor HTTP delegation support out of httpfs to common. 
+    (tucu)
+
+    HADOOP-10835. Implement HTTP proxyuser support in HTTP authentication 
+    client/server libraries. (tucu)
+
   OPTIMIZATIONS
 
   BUG FIXES
@@ -521,9 +533,6 @@ Release 2.6.0 - UNRELEASED
     HADOOP-10830. Missing lock in JavaKeyStoreProvider.createCredentialEntry.
     (Benoy Antony via umamahesh)
 
-    HADOOP-10876. The constructor of Path should not take an empty URL as a
-    parameter. (Zhihai Xu via wang)
-
     HADOOP-10928. Incorrect usage on `hadoop credential list`.
     (Josh Elser via wang)
 
@@ -545,6 +554,12 @@ Release 2.6.0 - UNRELEASED
 
     HADOOP-10931 compile error on tools/hadoop-openstack (xukun via stevel)
 
+    HADOOP-10929. Typo in Configuration.getPasswordFromCredentialProviders
+    (lmccay via brandonli)
+
+    HADOOP-10402. Configuration.getValByRegex does not substitute for
+    variables. (Robert Kanter via kasha)
+
 Release 2.5.0 - UNRELEASED
 
   INCOMPATIBLE CHANGES

hadoop-common-project/hadoop-common/pom.xml

@@ -203,6 +203,17 @@
       <artifactId>hadoop-auth</artifactId>
       <scope>compile</scope>
     </dependency>
+    <dependency>
+      <groupId>org.apache.hadoop</groupId>
+      <artifactId>hadoop-auth</artifactId>
+      <type>test-jar</type>
+      <scope>test</scope>
+    </dependency>
+    <dependency>
+      <groupId>org.apache.hadoop</groupId>
+      <artifactId>hadoop-minikdc</artifactId>
+      <scope>test</scope>
+    </dependency>
     <dependency>
       <groupId>com.jcraft</groupId>
       <artifactId>jsch</artifactId>

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/conf/Configuration.java

@@ -1781,7 +1781,7 @@ public class Configuration implements Iterable<Map.Entry<String,String>>,
   public char[] getPassword(String name) throws IOException {
     char[] pass = null;
 
-    pass = getPasswordFromCredenitalProviders(name);
+    pass = getPasswordFromCredentialProviders(name);
 
     if (pass == null) {
       pass = getPasswordFromConfig(name);
@@ -1797,7 +1797,7 @@ public class Configuration implements Iterable<Map.Entry<String,String>>,
    * @return password or null if not found
    * @throws IOException
    */
-  protected char[] getPasswordFromCredenitalProviders(String name)
+  protected char[] getPasswordFromCredentialProviders(String name)
       throws IOException {
     char[] pass = null;
     try {
@@ -2755,7 +2755,8 @@ public class Configuration implements Iterable<Map.Entry<String,String>>,
           item.getValue() instanceof String) {
         m = p.matcher((String)item.getKey());
         if(m.find()) { // match
-          result.put((String) item.getKey(), (String) item.getValue());
+          result.put((String) item.getKey(),
+              substituteVars(getProps().getProperty((String) item.getKey())));
         }
       }
     }

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/crypto/key/JavaKeyStoreProvider.java

@@ -27,8 +27,11 @@ import org.apache.hadoop.fs.FileSystem;
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.fs.permission.FsPermission;
 import org.apache.hadoop.security.ProviderUtils;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import javax.crypto.spec.SecretKeySpec;
+
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.ObjectInputStream;
@@ -80,6 +83,9 @@ import java.util.concurrent.locks.ReentrantReadWriteLock;
 @InterfaceAudience.Private
 public class JavaKeyStoreProvider extends KeyProvider {
   private static final String KEY_METADATA = "KeyMetadata";
+  private static Logger LOG =
+      LoggerFactory.getLogger(JavaKeyStoreProvider.class);
+
   public static final String SCHEME_NAME = "jceks";
 
   public static final String KEYSTORE_PASSWORD_FILE_KEY =
@@ -115,6 +121,10 @@ public class JavaKeyStoreProvider extends KeyProvider {
       if (pwFile != null) {
         ClassLoader cl = Thread.currentThread().getContextClassLoader();
         URL pwdFile = cl.getResource(pwFile);
+        if (pwdFile == null) {
+          // Provided Password file does not exist
+          throw new IOException("Password file does not exists");
+        }
         if (pwdFile != null) {
           InputStream is = pwdFile.openStream();
           try {
@@ -129,19 +139,25 @@ public class JavaKeyStoreProvider extends KeyProvider {
       password = KEYSTORE_PASSWORD_DEFAULT;
     }
     try {
+      Path oldPath = constructOldPath(path);
+      Path newPath = constructNewPath(path);
       keyStore = KeyStore.getInstance(SCHEME_NAME);
+      FsPermission perm = null;
       if (fs.exists(path)) {
-        // save off permissions in case we need to
-        // rewrite the keystore in flush()
-        FileStatus s = fs.getFileStatus(path);
-        permissions = s.getPermission();
-
-        keyStore.load(fs.open(path), password);
+        // flush did not proceed to completion
+        // _NEW should not exist
+        if (fs.exists(newPath)) {
+          throw new IOException(
+              String.format("Keystore not loaded due to some inconsistency "
+              + "('%s' and '%s' should not exist together)!!", path, newPath));
+        }
+        perm = tryLoadFromPath(path, oldPath);
       } else {
-        permissions = new FsPermission("700");
-        // required to create an empty keystore. *sigh*
-        keyStore.load(null, password);
+        perm = tryLoadIncompleteFlush(oldPath, newPath);
       }
+      // Need to save off permissions in case we need to
+      // rewrite the keystore in flush()
+      permissions = perm;
     } catch (KeyStoreException e) {
       throw new IOException("Can't create keystore", e);
     } catch (NoSuchAlgorithmException e) {
@@ -154,6 +170,136 @@ public class JavaKeyStoreProvider extends KeyProvider {
     writeLock = lock.writeLock();
   }
 
+  /**
+   * Try loading from the user specified path, else load from the backup
+   * path in case Exception is not due to bad/wrong password
+   * @param path Actual path to load from
+   * @param backupPath Backup path (_OLD)
+   * @return The permissions of the loaded file
+   * @throws NoSuchAlgorithmException
+   * @throws CertificateException
+   * @throws IOException
+   */
+  private FsPermission tryLoadFromPath(Path path, Path backupPath)
+      throws NoSuchAlgorithmException, CertificateException,
+      IOException {
+    FsPermission perm = null;
+    try {
+      perm = loadFromPath(path, password);
+      // Remove _OLD if exists
+      if (fs.exists(backupPath)) {
+        fs.delete(backupPath, true);
+      }
+      LOG.debug("KeyStore loaded successfully !!");
+    } catch (IOException ioe) {
+      // If file is corrupted for some reason other than
+      // wrong password try the _OLD file if exits
+      if (!isBadorWrongPassword(ioe)) {
+        perm = loadFromPath(backupPath, password);
+        // Rename CURRENT to CORRUPTED
+        renameOrFail(path, new Path(path.toString() + "_CORRUPTED_"
+            + System.currentTimeMillis()));
+        renameOrFail(backupPath, path);
+        LOG.debug(String.format(
+            "KeyStore loaded successfully from '%s' since '%s'"
+                + "was corrupted !!", backupPath, path));
+      } else {
+        throw ioe;
+      }
+    }
+    return perm;
+  }
+
+  /**
+   * The KeyStore might have gone down during a flush, In which case either the
+   * _NEW or _OLD files might exists. This method tries to load the KeyStore
+   * from one of these intermediate files.
+   * @param oldPath the _OLD file created during flush
+   * @param newPath the _NEW file created during flush
+   * @return The permissions of the loaded file
+   * @throws IOException
+   * @throws NoSuchAlgorithmException
+   * @throws CertificateException
+   */
+  private FsPermission tryLoadIncompleteFlush(Path oldPath, Path newPath)
+      throws IOException, NoSuchAlgorithmException, CertificateException {
+    FsPermission perm = null;
+    // Check if _NEW exists (in case flush had finished writing but not
+    // completed the re-naming)
+    if (fs.exists(newPath)) {
+      perm = loadAndReturnPerm(newPath, oldPath);
+    }
+    // try loading from _OLD (An earlier Flushing MIGHT not have completed
+    // writing completely)
+    if ((perm == null) && fs.exists(oldPath)) {
+      perm = loadAndReturnPerm(oldPath, newPath);
+    }
+    // If not loaded yet,
+    // required to create an empty keystore. *sigh*
+    if (perm == null) {
+      keyStore.load(null, password);
+      LOG.debug("KeyStore initialized anew successfully !!");
+      perm = new FsPermission("700");
+    }
+    return perm;
+  }
+
+  private FsPermission loadAndReturnPerm(Path pathToLoad, Path pathToDelete)
+      throws NoSuchAlgorithmException, CertificateException,
+      IOException {
+    FsPermission perm = null;
+    try {
+      perm = loadFromPath(pathToLoad, password);
+      renameOrFail(pathToLoad, path);
+      LOG.debug(String.format("KeyStore loaded successfully from '%s'!!",
+          pathToLoad));
+      if (fs.exists(pathToDelete)) {
+        fs.delete(pathToDelete, true);
+      }
+    } catch (IOException e) {
+      // Check for password issue : don't want to trash file due
+      // to wrong password
+      if (isBadorWrongPassword(e)) {
+        throw e;
+      }
+    }
+    return perm;
+  }
+
+  private boolean isBadorWrongPassword(IOException ioe) {
+    // As per documentation this is supposed to be the way to figure
+    // if password was correct
+    if (ioe.getCause() instanceof UnrecoverableKeyException) {
+      return true;
+    }
+    // Unfortunately that doesn't seem to work..
+    // Workaround :
+    if ((ioe.getCause() == null)
+        && (ioe.getMessage() != null)
+        && ((ioe.getMessage().contains("Keystore was tampered")) || (ioe
+            .getMessage().contains("password was incorrect")))) {
+      return true;
+    }
+    return false;
+  }
+
+  private FsPermission loadFromPath(Path p, char[] password)
+      throws IOException, NoSuchAlgorithmException, CertificateException {
+    FileStatus s = fs.getFileStatus(p);
+    keyStore.load(fs.open(p), password);
+    return s.getPermission();
+  }
+
+  private Path constructNewPath(Path path) {
+    Path newPath = new Path(path.toString() + "_NEW");
+    return newPath;
+  }
+
+  private Path constructOldPath(Path path) {
+    Path oldPath = new Path(path.toString() + "_OLD");
+    return oldPath;
+  }
+
   @Override
   public KeyVersion getKeyVersion(String versionName) throws IOException {
     readLock.lock();
@@ -352,11 +498,22 @@ public class JavaKeyStoreProvider extends KeyProvider {
 
   @Override
   public void flush() throws IOException {
+    Path newPath = constructNewPath(path);
+    Path oldPath = constructOldPath(path);
     writeLock.lock();
     try {
       if (!changed) {
         return;
       }
+      // Might exist if a backup has been restored etc.
+      if (fs.exists(newPath)) {
+        renameOrFail(newPath, new Path(newPath.toString()
+            + "_ORPHANED_" + System.currentTimeMillis()));
+      }
+      if (fs.exists(oldPath)) {
+        renameOrFail(oldPath, new Path(oldPath.toString()
+            + "_ORPHANED_" + System.currentTimeMillis()));
+      }
       // put all of the updates into the keystore
       for(Map.Entry<String, Metadata> entry: cache.entrySet()) {
         try {
@@ -366,25 +523,77 @@ public class JavaKeyStoreProvider extends KeyProvider {
           throw new IOException("Can't set metadata key " + entry.getKey(),e );
         }
       }
+
+      // Save old File first
+      boolean fileExisted = backupToOld(oldPath);
       // write out the keystore
-      FSDataOutputStream out = FileSystem.create(fs, path, permissions);
+      // Write to _NEW path first :
       try {
-        keyStore.store(out, password);
-      } catch (KeyStoreException e) {
-        throw new IOException("Can't store keystore " + this, e);
-      } catch (NoSuchAlgorithmException e) {
-        throw new IOException("No such algorithm storing keystore " + this, e);
-      } catch (CertificateException e) {
-        throw new IOException("Certificate exception storing keystore " + this,
-            e);
+        writeToNew(newPath);
+      } catch (IOException ioe) {
+        // rename _OLD back to curent and throw Exception
+        revertFromOld(oldPath, fileExisted);
+        throw ioe;
       }
-      out.close();
+      // Rename _NEW to CURRENT and delete _OLD
+      cleanupNewAndOld(newPath, oldPath);
       changed = false;
     } finally {
       writeLock.unlock();
     }
   }
 
+  private void cleanupNewAndOld(Path newPath, Path oldPath) throws IOException {
+    // Rename _NEW to CURRENT
+    renameOrFail(newPath, path);
+    // Delete _OLD
+    if (fs.exists(oldPath)) {
+      fs.delete(oldPath, true);
+    }
+  }
+
+  private void writeToNew(Path newPath) throws IOException {
+    FSDataOutputStream out =
+        FileSystem.create(fs, newPath, permissions);
+    try {
+      keyStore.store(out, password);
+    } catch (KeyStoreException e) {
+      throw new IOException("Can't store keystore " + this, e);
+    } catch (NoSuchAlgorithmException e) {
+      throw new IOException(
+          "No such algorithm storing keystore " + this, e);
+    } catch (CertificateException e) {
+      throw new IOException(
+          "Certificate exception storing keystore " + this, e);
+    }
+    out.close();
+  }
+
+  private void revertFromOld(Path oldPath, boolean fileExisted)
+      throws IOException {
+    if (fileExisted) {
+      renameOrFail(oldPath, path);
+    }
+  }
+
+  private boolean backupToOld(Path oldPath)
+      throws IOException {
+    boolean fileExisted = false;
+    if (fs.exists(path)) {
+      renameOrFail(path, oldPath);
+      fileExisted = true;
+    }
+    return fileExisted;
+  }
+
+  private void renameOrFail(Path src, Path dest)
+      throws IOException {
+    if (!fs.rename(src, dest)) {
+      throw new IOException("Rename unsuccessful : "
+          + String.format("'%s' to '%s'", src, dest));
+    }
+  }
+
   @Override
   public String toString() {
     return uri.toString();

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/crypto/key/kms/KMSClientProvider.java

@@ -512,7 +512,7 @@ public class KMSClientProvider extends KeyProvider implements CryptoExtension {
     List<String> batch = new ArrayList<String>();
     int batchLen = 0;
     for (String name : keyNames) {
-      int additionalLen = KMSRESTConstants.KEY_OP.length() + 1 + name.length();
+      int additionalLen = KMSRESTConstants.KEY.length() + 1 + name.length();
       batchLen += additionalLen;
       // topping at 1500 to account for initial URL and encoded names
       if (batchLen > 1500) {
@@ -536,7 +536,7 @@ public class KMSClientProvider extends KeyProvider implements CryptoExtension {
     for (String[] keySet : keySets) {
       if (keyNames.length > 0) {
         Map<String, Object> queryStr = new HashMap<String, Object>();
-        queryStr.put(KMSRESTConstants.KEY_OP, keySet);
+        queryStr.put(KMSRESTConstants.KEY, keySet);
         URL url = createURL(KMSRESTConstants.KEYS_METADATA_RESOURCE, null,
             null, queryStr);
         HttpURLConnection conn = createConnection(url, HTTP_GET);

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/crypto/key/kms/KMSRESTConstants.java

@@ -37,7 +37,7 @@ public class KMSRESTConstants {
   public static final String EEK_SUB_RESOURCE = "_eek";
   public static final String CURRENT_VERSION_SUB_RESOURCE = "_currentversion";
 
-  public static final String KEY_OP = "key";
+  public static final String KEY = "key";
   public static final String EEK_OP = "eek_op";
   public static final String EEK_GENERATE = "generate";
   public static final String EEK_DECRYPT = "decrypt";

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/Path.java

@@ -129,19 +129,6 @@ public class Path implements Comparable {
     }   
   }
   
-  /** check URI parameter of Path constructor. */
-  private void checkPathArg(URI aUri) throws IllegalArgumentException {
-    // disallow construction of a Path from an empty URI
-    if (aUri == null) {
-      throw new IllegalArgumentException(
-          "Can not create a Path from a null URI");
-    }
-    if (aUri.toString().isEmpty()) {
-      throw new IllegalArgumentException(
-          "Can not create a Path from an empty URI");
-    }
-  }
-
   /** Construct a path from a String.  Path strings are URIs, but with
    * unescaped elements and some additional normalization. */
   public Path(String pathString) throws IllegalArgumentException {
@@ -189,7 +176,6 @@ public class Path implements Comparable {
    * Construct a path from a URI
    */
   public Path(URI aUri) {
-    checkPathArg(aUri);
     uri = aUri.normalize();
   }
   

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/metrics2/impl/MetricsCollectorImpl.java

@@ -21,14 +21,18 @@ package org.apache.hadoop.metrics2.impl;
 import java.util.Iterator;
 import java.util.List;
 
+import com.google.common.annotations.VisibleForTesting;
 import com.google.common.collect.Lists;
 
+import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.metrics2.MetricsInfo;
 import org.apache.hadoop.metrics2.MetricsCollector;
 import org.apache.hadoop.metrics2.MetricsFilter;
 import static org.apache.hadoop.metrics2.lib.Interns.*;
 
-class MetricsCollectorImpl implements MetricsCollector,
+@InterfaceAudience.Private
+@VisibleForTesting
+public class MetricsCollectorImpl implements MetricsCollector,
     Iterable<MetricsRecordBuilderImpl> {
 
   private final List<MetricsRecordBuilderImpl> rbs = Lists.newArrayList();

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/metrics2/lib/MutableStat.java

@@ -89,6 +89,14 @@ public class MutableStat extends MutableMetric {
     this(name, description, sampleName, valueName, false);
   }
 
+  /**
+   * Set whether to display the extended stats (stdev, min/max etc.) or not
+   * @param extended enable/disable displaying extended stats
+   */
+  public synchronized void setExtended(boolean extended) {
+    this.extended = extended;
+  }
+
   /**
    * Add a number of samples and their sum to the running stat
    * @param numSamples  number of samples

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/token/delegation/web/DelegationTokenAuthenticatedURL.java

@@ -0,0 +1,343 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.hadoop.security.token.delegation.web;
+
+import com.google.common.base.Preconditions;
+import org.apache.hadoop.classification.InterfaceAudience;
+import org.apache.hadoop.classification.InterfaceStability;
+import org.apache.hadoop.io.Text;
+import org.apache.hadoop.security.Credentials;
+import org.apache.hadoop.security.SecurityUtil;
+import org.apache.hadoop.security.UserGroupInformation;
+import org.apache.hadoop.security.authentication.client.AuthenticatedURL;
+import org.apache.hadoop.security.authentication.client.AuthenticationException;
+import org.apache.hadoop.security.authentication.client.ConnectionConfigurator;
+import org.apache.hadoop.security.token.TokenIdentifier;
+import org.apache.hadoop.security.token.delegation.AbstractDelegationTokenIdentifier;
+
+import java.io.IOException;
+import java.net.HttpURLConnection;
+import java.net.InetSocketAddress;
+import java.net.URL;
+import java.net.URLEncoder;
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * The <code>DelegationTokenAuthenticatedURL</code> is a
+ * {@link AuthenticatedURL} sub-class with built-in Hadoop Delegation Token
+ * functionality.
+ * <p/>
+ * The authentication mechanisms supported by default are Hadoop Simple
+ * authentication (also known as pseudo authentication) and Kerberos SPNEGO
+ * authentication.
+ * <p/>
+ * Additional authentication mechanisms can be supported via {@link
+ * DelegationTokenAuthenticator} implementations.
+ * <p/>
+ * The default {@link DelegationTokenAuthenticator} is the {@link
+ * KerberosDelegationTokenAuthenticator} class which supports
+ * automatic fallback from Kerberos SPNEGO to Hadoop Simple authentication via
+ * the {@link PseudoDelegationTokenAuthenticator} class.
+ * <p/>
+ * <code>AuthenticatedURL</code> instances are not thread-safe.
+ */
+@InterfaceAudience.Public
+@InterfaceStability.Unstable
+public class DelegationTokenAuthenticatedURL extends AuthenticatedURL {
+
+  /**
+   * Constant used in URL's query string to perform a proxy user request, the
+   * value of the <code>DO_AS</code> parameter is the user the request will be
+   * done on behalf of.
+   */
+  static final String DO_AS = "doAs";
+
+  /**
+   * Client side authentication token that handles Delegation Tokens.
+   */
+  @InterfaceAudience.Public
+  @InterfaceStability.Unstable
+  public static class Token extends AuthenticatedURL.Token {
+    private
+    org.apache.hadoop.security.token.Token<AbstractDelegationTokenIdentifier>
+        delegationToken;
+
+    org.apache.hadoop.security.token.Token<AbstractDelegationTokenIdentifier>
+    getDelegationToken() {
+      return delegationToken;
+    }
+
+  }
+
+  private static Class<? extends DelegationTokenAuthenticator>
+      DEFAULT_AUTHENTICATOR = KerberosDelegationTokenAuthenticator.class;
+
+  /**
+   * Sets the default {@link DelegationTokenAuthenticator} class to use when an
+   * {@link DelegationTokenAuthenticatedURL} instance is created without
+   * specifying one.
+   *
+   * The default class is {@link KerberosDelegationTokenAuthenticator}
+   *
+   * @param authenticator the authenticator class to use as default.
+   */
+  public static void setDefaultDelegationTokenAuthenticator(
+      Class<? extends DelegationTokenAuthenticator> authenticator) {
+    DEFAULT_AUTHENTICATOR = authenticator;
+  }
+
+  /**
+   * Returns the default {@link DelegationTokenAuthenticator} class to use when
+   * an {@link DelegationTokenAuthenticatedURL} instance is created without
+   * specifying one.
+   * <p/>
+   * The default class is {@link KerberosDelegationTokenAuthenticator}
+   *
+   * @return the delegation token authenticator class to use as default.
+   */
+  public static Class<? extends DelegationTokenAuthenticator>
+      getDefaultDelegationTokenAuthenticator() {
+    return DEFAULT_AUTHENTICATOR;
+  }
+
+  private static DelegationTokenAuthenticator
+      obtainDelegationTokenAuthenticator(DelegationTokenAuthenticator dta) {
+    try {
+      return (dta != null) ? dta : DEFAULT_AUTHENTICATOR.newInstance();
+    } catch (Exception ex) {
+      throw new IllegalArgumentException(ex);
+    }
+  }
+
+  /**
+   * Creates an <code>DelegationTokenAuthenticatedURL</code>.
+   * <p/>
+   * An instance of the default {@link DelegationTokenAuthenticator} will be
+   * used.
+   */
+  public DelegationTokenAuthenticatedURL() {
+    this(null, null);
+  }
+
+  /**
+   * Creates an <code>DelegationTokenAuthenticatedURL</code>.
+   *
+   * @param authenticator the {@link DelegationTokenAuthenticator} instance to
+   * use, if <code>null</code> the default one will be used.
+   */
+  public DelegationTokenAuthenticatedURL(
+      DelegationTokenAuthenticator authenticator) {
+    this(authenticator, null);
+  }
+
+  /**
+   * Creates an <code>DelegationTokenAuthenticatedURL</code> using the default
+   * {@link DelegationTokenAuthenticator} class.
+   *
+   * @param connConfigurator a connection configurator.
+   */
+  public DelegationTokenAuthenticatedURL(
+      ConnectionConfigurator connConfigurator) {
+    this(null, connConfigurator);
+  }
+
+  /**
+   * Creates an <code>DelegationTokenAuthenticatedURL</code>.
+   *
+   * @param authenticator the {@link DelegationTokenAuthenticator} instance to
+   * use, if <code>null</code> the default one will be used.
+   * @param connConfigurator a connection configurator.
+   */
+  public DelegationTokenAuthenticatedURL(
+      DelegationTokenAuthenticator authenticator,
+      ConnectionConfigurator connConfigurator) {
+    super(obtainDelegationTokenAuthenticator(authenticator), connConfigurator);
+  }
+
+  /**
+   * Returns an authenticated {@link HttpURLConnection}, it uses a Delegation
+   * Token only if the given auth token is an instance of {@link Token} and
+   * it contains a Delegation Token, otherwise use the configured
+   * {@link DelegationTokenAuthenticator} to authenticate the connection.
+   *
+   * @param url the URL to connect to. Only HTTP/S URLs are supported.
+   * @param token the authentication token being used for the user.
+   * @return an authenticated {@link HttpURLConnection}.
+   * @throws IOException if an IO error occurred.
+   * @throws AuthenticationException if an authentication exception occurred.
+   */
+  @Override
+  public HttpURLConnection openConnection(URL url, AuthenticatedURL.Token token)
+      throws IOException, AuthenticationException {
+    return (token instanceof Token) ? openConnection(url, (Token) token)
+                                    : super.openConnection(url ,token);
+  }
+
+  /**
+   * Returns an authenticated {@link HttpURLConnection}. If the Delegation
+   * Token is present, it will be used taking precedence over the configured
+   * <code>Authenticator</code>.
+   *
+   * @param url the URL to connect to. Only HTTP/S URLs are supported.
+   * @param token the authentication token being used for the user.
+   * @return an authenticated {@link HttpURLConnection}.
+   * @throws IOException if an IO error occurred.
+   * @throws AuthenticationException if an authentication exception occurred.
+   */
+  public HttpURLConnection openConnection(URL url, Token token)
+      throws IOException, AuthenticationException {
+    return openConnection(url, token, null);
+  }
+
+  private URL augmentURL(URL url, Map<String, String> params)
+      throws IOException {
+    if (params != null && params.size() > 0) {
+      String urlStr = url.toExternalForm();
+      StringBuilder sb = new StringBuilder(urlStr);
+      String separator = (urlStr.contains("?")) ? "&" : "?";
+      for (Map.Entry<String, String> param : params.entrySet()) {
+        sb.append(separator).append(param.getKey()).append("=").append(
+            param.getValue());
+        separator = "&";
+      }
+      url = new URL(sb.toString());
+    }
+    return url;
+  }
+
+  /**
+   * Returns an authenticated {@link HttpURLConnection}. If the Delegation
+   * Token is present, it will be used taking precedence over the configured
+   * <code>Authenticator</code>. If the <code>doAs</code> parameter is not NULL,
+   * the request will be done on behalf of the specified <code>doAs</code> user.
+   *
+   * @param url the URL to connect to. Only HTTP/S URLs are supported.
+   * @param token the authentication token being used for the user.
+   * @param doAs user to do the the request on behalf of, if NULL the request is
+   * as self.
+   * @return an authenticated {@link HttpURLConnection}.
+   * @throws IOException if an IO error occurred.
+   * @throws AuthenticationException if an authentication exception occurred.
+   */
+  public HttpURLConnection openConnection(URL url, Token token, String doAs)
+      throws IOException, AuthenticationException {
+    Preconditions.checkNotNull(url, "url");
+    Preconditions.checkNotNull(token, "token");
+    Map<String, String> extraParams = new HashMap<String, String>();
+
+    // delegation token
+    Credentials creds = UserGroupInformation.getCurrentUser().getCredentials();
+    if (!creds.getAllTokens().isEmpty()) {
+      InetSocketAddress serviceAddr = new InetSocketAddress(url.getHost(),
+          url.getPort());
+      Text service = SecurityUtil.buildTokenService(serviceAddr);
+      org.apache.hadoop.security.token.Token<? extends TokenIdentifier> dt =
+          creds.getToken(service);
+      if (dt != null) {
+        extraParams.put(KerberosDelegationTokenAuthenticator.DELEGATION_PARAM,
+            dt.encodeToUrlString());
+      }
+    }
+
+    // proxyuser
+    if (doAs != null) {
+      extraParams.put(DO_AS, URLEncoder.encode(doAs, "UTF-8"));
+    }
+
+    url = augmentURL(url, extraParams);
+    return super.openConnection(url, token);
+  }
+
+  /**
+   * Requests a delegation token using the configured <code>Authenticator</code>
+   * for authentication.
+   *
+   * @param url the URL to get the delegation token from. Only HTTP/S URLs are
+   * supported.
+   * @param token the authentication token being used for the user where the
+   * Delegation token will be stored.
+   * @return a delegation token.
+   * @throws IOException if an IO error occurred.
+   * @throws AuthenticationException if an authentication exception occurred.
+   */
+  public org.apache.hadoop.security.token.Token<AbstractDelegationTokenIdentifier>
+      getDelegationToken(URL url, Token token, String renewer)
+          throws IOException, AuthenticationException {
+    Preconditions.checkNotNull(url, "url");
+    Preconditions.checkNotNull(token, "token");
+    try {
+      token.delegationToken =
+          ((KerberosDelegationTokenAuthenticator) getAuthenticator()).
+              getDelegationToken(url, token, renewer);
+      return token.delegationToken;
+    } catch (IOException ex) {
+      token.delegationToken = null;
+      throw ex;
+    }
+  }
+
+  /**
+   * Renews a delegation token from the server end-point using the
+   * configured <code>Authenticator</code> for authentication.
+   *
+   * @param url the URL to renew the delegation token from. Only HTTP/S URLs are
+   * supported.
+   * @param token the authentication token with the Delegation Token to renew.
+   * @throws IOException if an IO error occurred.
+   * @throws AuthenticationException if an authentication exception occurred.
+   */
+  public long renewDelegationToken(URL url, Token token)
+      throws IOException, AuthenticationException {
+    Preconditions.checkNotNull(url, "url");
+    Preconditions.checkNotNull(token, "token");
+    Preconditions.checkNotNull(token.delegationToken,
+        "No delegation token available");
+    try {
+      return ((KerberosDelegationTokenAuthenticator) getAuthenticator()).
+          renewDelegationToken(url, token, token.delegationToken);
+    } catch (IOException ex) {
+      token.delegationToken = null;
+      throw ex;
+    }
+  }
+
+  /**
+   * Cancels a delegation token from the server end-point. It does not require
+   * being authenticated by the configured <code>Authenticator</code>.
+   *
+   * @param url the URL to cancel the delegation token from. Only HTTP/S URLs
+   * are supported.
+   * @param token the authentication token with the Delegation Token to cancel.
+   * @throws IOException if an IO error occurred.
+   */
+  public void cancelDelegationToken(URL url, Token token)
+      throws IOException {
+    Preconditions.checkNotNull(url, "url");
+    Preconditions.checkNotNull(token, "token");
+    Preconditions.checkNotNull(token.delegationToken,
+        "No delegation token available");
+    try {
+      ((KerberosDelegationTokenAuthenticator) getAuthenticator()).
+          cancelDelegationToken(url, token, token.delegationToken);
+    } finally {
+      token.delegationToken = null;
+    }
+  }
+
+}

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/token/delegation/web/DelegationTokenAuthenticationFilter.java

@@ -0,0 +1,274 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.hadoop.security.token.delegation.web;
+
+import com.google.common.annotations.VisibleForTesting;
+import org.apache.hadoop.classification.InterfaceAudience;
+import org.apache.hadoop.classification.InterfaceStability;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.security.SaslRpcServer;
+import org.apache.hadoop.security.UserGroupInformation;
+import org.apache.hadoop.security.authentication.server.AuthenticationFilter;
+import org.apache.hadoop.security.authentication.server.AuthenticationHandler;
+import org.apache.hadoop.security.authentication.server.AuthenticationToken;
+import org.apache.hadoop.security.authentication.server.KerberosAuthenticationHandler;
+import org.apache.hadoop.security.authentication.server.PseudoAuthenticationHandler;
+import org.apache.hadoop.security.authorize.AuthorizationException;
+import org.apache.hadoop.security.authorize.ProxyUsers;
+import org.apache.hadoop.security.token.delegation.AbstractDelegationTokenSecretManager;
+import org.apache.http.NameValuePair;
+import org.apache.http.client.utils.URLEncodedUtils;
+import org.codehaus.jackson.map.ObjectMapper;
+
+import javax.servlet.FilterChain;
+import javax.servlet.FilterConfig;
+import javax.servlet.ServletContext;
+import javax.servlet.ServletException;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletRequestWrapper;
+import javax.servlet.http.HttpServletResponse;
+import java.io.IOException;
+import java.io.Writer;
+import java.nio.charset.Charset;
+import java.security.Principal;
+import java.util.Enumeration;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Properties;
+
+/**
+ *  The <code>DelegationTokenAuthenticationFilter</code> filter is a
+ *  {@link AuthenticationFilter} with Hadoop Delegation Token support.
+ *  <p/>
+ *  By default it uses it own instance of the {@link
+ *  AbstractDelegationTokenSecretManager}. For situations where an external
+ *  <code>AbstractDelegationTokenSecretManager</code> is required (i.e. one that
+ *  shares the secret with <code>AbstractDelegationTokenSecretManager</code>
+ *  instance running in other services), the external
+ *  <code>AbstractDelegationTokenSecretManager</code> must be set as an
+ *  attribute in the {@link ServletContext} of the web application using the
+ *  {@link #DELEGATION_TOKEN_SECRET_MANAGER_ATTR} attribute name (
+ *  'hadoop.http.delegation-token-secret-manager').
+ */
+@InterfaceAudience.Private
+@InterfaceStability.Evolving
+public class DelegationTokenAuthenticationFilter
+    extends AuthenticationFilter {
+
+  private static final String APPLICATION_JSON_MIME = "application/json";
+  private static final String ERROR_EXCEPTION_JSON = "exception";
+  private static final String ERROR_MESSAGE_JSON = "message";
+
+  /**
+   * Sets an external <code>DelegationTokenSecretManager</code> instance to
+   * manage creation and verification of Delegation Tokens.
+   * <p/>
+   * This is useful for use cases where secrets must be shared across multiple
+   * services.
+   */
+
+  public static final String DELEGATION_TOKEN_SECRET_MANAGER_ATTR =
+      "hadoop.http.delegation-token-secret-manager";
+
+  private static final Charset UTF8_CHARSET = Charset.forName("UTF-8");
+
+  private static final ThreadLocal<UserGroupInformation> UGI_TL =
+      new ThreadLocal<UserGroupInformation>();
+  public static final String PROXYUSER_PREFIX = "proxyuser";
+
+  private SaslRpcServer.AuthMethod handlerAuthMethod;
+
+  /**
+   * It delegates to
+   * {@link AuthenticationFilter#getConfiguration(String, FilterConfig)} and
+   * then overrides the {@link AuthenticationHandler} to use if authentication
+   * type is set to <code>simple</code> or <code>kerberos</code> in order to use
+   * the corresponding implementation with delegation token support.
+   *
+   * @param configPrefix parameter not used.
+   * @param filterConfig parameter not used.
+   * @return hadoop-auth de-prefixed configuration for the filter and handler.
+   */
+  @Override
+  protected Properties getConfiguration(String configPrefix,
+      FilterConfig filterConfig) throws ServletException {
+    Properties props = super.getConfiguration(configPrefix, filterConfig);
+    String authType = props.getProperty(AUTH_TYPE);
+    if (authType.equals(PseudoAuthenticationHandler.TYPE)) {
+      props.setProperty(AUTH_TYPE,
+          PseudoDelegationTokenAuthenticationHandler.class.getName());
+    } else if (authType.equals(KerberosAuthenticationHandler.TYPE)) {
+      props.setProperty(AUTH_TYPE,
+          KerberosDelegationTokenAuthenticationHandler.class.getName());
+    }
+    return props;
+  }
+
+  /**
+   * Returns the proxyuser configuration. All returned properties must start
+   * with <code>proxyuser.</code>'
+   * <p/>
+   * Subclasses may override this method if the proxyuser configuration is 
+   * read from other place than the filter init parameters.
+   *
+   * @param filterConfig filter configuration object
+   * @return the proxyuser configuration properties.
+   * @throws ServletException thrown if the configuration could not be created.
+   */
+  protected Configuration getProxyuserConfiguration(FilterConfig filterConfig)
+      throws ServletException {
+    // this filter class gets the configuration from the filter configs, we are
+    // creating an empty configuration and injecting the proxyuser settings in
+    // it. In the initialization of the filter, the returned configuration is
+    // passed to the ProxyUsers which only looks for 'proxyusers.' properties.
+    Configuration conf = new Configuration(false);
+    Enumeration<?> names = filterConfig.getInitParameterNames();
+    while (names.hasMoreElements()) {
+      String name = (String) names.nextElement();
+      if (name.startsWith(PROXYUSER_PREFIX + ".")) {
+        String value = filterConfig.getInitParameter(name);
+        conf.set(name, value);
+      }
+    }
+    return conf;
+  }
+
+
+  @Override
+  public void init(FilterConfig filterConfig) throws ServletException {
+    super.init(filterConfig);
+    AuthenticationHandler handler = getAuthenticationHandler();
+    AbstractDelegationTokenSecretManager dtSecretManager =
+        (AbstractDelegationTokenSecretManager) filterConfig.getServletContext().
+            getAttribute(DELEGATION_TOKEN_SECRET_MANAGER_ATTR);
+    if (dtSecretManager != null && handler
+        instanceof DelegationTokenAuthenticationHandler) {
+      DelegationTokenAuthenticationHandler dtHandler =
+          (DelegationTokenAuthenticationHandler) getAuthenticationHandler();
+      dtHandler.setExternalDelegationTokenSecretManager(dtSecretManager);
+    }
+    if (handler instanceof PseudoAuthenticationHandler ||
+        handler instanceof PseudoDelegationTokenAuthenticationHandler) {
+      setHandlerAuthMethod(SaslRpcServer.AuthMethod.SIMPLE);
+    }
+    if (handler instanceof KerberosAuthenticationHandler ||
+        handler instanceof KerberosDelegationTokenAuthenticationHandler) {
+      setHandlerAuthMethod(SaslRpcServer.AuthMethod.KERBEROS);
+    }
+
+    // proxyuser configuration
+    Configuration conf = getProxyuserConfiguration(filterConfig);
+    ProxyUsers.refreshSuperUserGroupsConfiguration(conf, PROXYUSER_PREFIX);
+  }
+
+  protected void setHandlerAuthMethod(SaslRpcServer.AuthMethod authMethod) {
+    this.handlerAuthMethod = authMethod;
+  }
+
+  @VisibleForTesting
+  static String getDoAs(HttpServletRequest request) {
+    List<NameValuePair> list = URLEncodedUtils.parse(request.getQueryString(),
+        UTF8_CHARSET);
+    if (list != null) {
+      for (NameValuePair nv : list) {
+        if (DelegationTokenAuthenticatedURL.DO_AS.equals(nv.getName())) {
+          return nv.getValue();
+        }
+      }
+    }
+    return null;
+  }
+
+  static UserGroupInformation getHttpUserGroupInformationInContext() {
+    return UGI_TL.get();
+  }
+
+  @Override
+  protected void doFilter(FilterChain filterChain, HttpServletRequest request,
+      HttpServletResponse response) throws IOException, ServletException {
+    boolean requestCompleted = false;
+    UserGroupInformation ugi = null;
+    AuthenticationToken authToken = (AuthenticationToken)
+        request.getUserPrincipal();
+    if (authToken != null && authToken != AuthenticationToken.ANONYMOUS) {
+      // if the request was authenticated because of a delegation token,
+      // then we ignore proxyuser (this is the same as the RPC behavior).
+      ugi = (UserGroupInformation) request.getAttribute(
+          DelegationTokenAuthenticationHandler.DELEGATION_TOKEN_UGI_ATTRIBUTE);
+      if (ugi == null) {
+        String realUser = request.getUserPrincipal().getName();
+        ugi = UserGroupInformation.createRemoteUser(realUser,
+            handlerAuthMethod);
+        String doAsUser = getDoAs(request);
+        if (doAsUser != null) {
+          ugi = UserGroupInformation.createProxyUser(doAsUser, ugi);
+          try {
+            ProxyUsers.authorize(ugi, request.getRemoteHost());
+          } catch (AuthorizationException ex) {
+            String msg = String.format(
+                "User '%s' from host '%s' not allowed to impersonate user '%s'",
+                realUser, request.getRemoteHost(), doAsUser);
+            response.setStatus(HttpServletResponse.SC_FORBIDDEN);
+            response.setContentType(APPLICATION_JSON_MIME);
+            Map<String, String> json = new HashMap<String, String>();
+            json.put(ERROR_EXCEPTION_JSON,
+                AuthorizationException.class.getName());
+            json.put(ERROR_MESSAGE_JSON, msg);
+            Writer writer = response.getWriter();
+            ObjectMapper jsonMapper = new ObjectMapper();
+            jsonMapper.writeValue(writer, json);
+            requestCompleted = true;
+          }
+        }
+      }
+      UGI_TL.set(ugi);
+    }
+    if (!requestCompleted) {
+      final UserGroupInformation ugiF = ugi;
+      try {
+        request = new HttpServletRequestWrapper(request) {
+
+          @Override
+          public String getAuthType() {
+            return (ugiF != null) ? handlerAuthMethod.toString() : null;
+          }
+
+          @Override
+          public String getRemoteUser() {
+            return (ugiF != null) ? ugiF.getShortUserName() : null;
+          }
+
+          @Override
+          public Principal getUserPrincipal() {
+            return (ugiF != null) ? new Principal() {
+              @Override
+              public String getName() {
+                return ugiF.getUserName();
+              }
+            } : null;
+          }
+        };
+        super.doFilter(filterChain, request, response);
+      } finally {
+        UGI_TL.remove();
+      }
+    }
+  }
+
+}

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/token/delegation/web/DelegationTokenAuthenticationHandler.java

@@ -0,0 +1,359 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.hadoop.security.token.delegation.web;
+
+import com.google.common.annotations.VisibleForTesting;
+import org.apache.hadoop.classification.InterfaceAudience;
+import org.apache.hadoop.classification.InterfaceStability;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.io.Text;
+import org.apache.hadoop.security.UserGroupInformation;
+import org.apache.hadoop.security.authentication.client.AuthenticationException;
+import org.apache.hadoop.security.authentication.server.AuthenticationHandler;
+import org.apache.hadoop.security.authentication.server.AuthenticationToken;
+import org.apache.hadoop.security.authentication.server.KerberosAuthenticationHandler;
+import org.apache.hadoop.security.token.Token;
+import org.apache.hadoop.security.token.delegation.AbstractDelegationTokenSecretManager;
+import org.codehaus.jackson.map.ObjectMapper;
+
+import javax.servlet.ServletException;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import javax.ws.rs.core.MediaType;
+import java.io.IOException;
+import java.io.Writer;
+import java.text.MessageFormat;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.Properties;
+import java.util.Set;
+
+/**
+ * An {@link AuthenticationHandler} that implements Kerberos SPNEGO mechanism
+ * for HTTP and supports Delegation Token functionality.
+ * <p/>
+ * In addition to the wrapped {@link AuthenticationHandler} configuration
+ * properties, this handler supports the following properties prefixed
+ * with the type of the wrapped <code>AuthenticationHandler</code>:
+ * <ul>
+ * <li>delegation-token.token-kind: the token kind for generated tokens
+ * (no default, required property).</li>
+ * <li>delegation-token.update-interval.sec: secret manager master key
+ * update interval in seconds (default 1 day).</li>
+ * <li>delegation-token.max-lifetime.sec: maximum life of a delegation
+ * token in seconds (default 7 days).</li>
+ * <li>delegation-token.renewal-interval.sec: renewal interval for
+ * delegation tokens in seconds (default 1 day).</li>
+ * <li>delegation-token.removal-scan-interval.sec: delegation tokens
+ * removal scan interval in seconds (default 1 hour).</li>
+ * </ul>
+ *
+ */
+@InterfaceAudience.Private
+@InterfaceStability.Evolving
+public abstract class DelegationTokenAuthenticationHandler
+    implements AuthenticationHandler {
+
+  protected static final String TYPE_POSTFIX = "-dt";
+
+  public static final String PREFIX = "delegation-token.";
+
+  public static final String TOKEN_KIND = PREFIX + "token-kind.sec";
+
+  public static final String UPDATE_INTERVAL = PREFIX + "update-interval.sec";
+  public static final long UPDATE_INTERVAL_DEFAULT = 24 * 60 * 60;
+
+  public static final String MAX_LIFETIME = PREFIX + "max-lifetime.sec";
+  public static final long MAX_LIFETIME_DEFAULT = 7 * 24 * 60 * 60;
+
+  public static final String RENEW_INTERVAL = PREFIX + "renew-interval.sec";
+  public static final long RENEW_INTERVAL_DEFAULT = 24 * 60 * 60;
+
+  public static final String REMOVAL_SCAN_INTERVAL = PREFIX +
+      "removal-scan-interval.sec";
+  public static final long REMOVAL_SCAN_INTERVAL_DEFAULT = 60 * 60;
+
+  private static final Set<String> DELEGATION_TOKEN_OPS = new HashSet<String>();
+
+  static final String DELEGATION_TOKEN_UGI_ATTRIBUTE =
+      "hadoop.security.delegation-token.ugi";
+
+  static {
+    DELEGATION_TOKEN_OPS.add(KerberosDelegationTokenAuthenticator.
+        DelegationTokenOperation.GETDELEGATIONTOKEN.toString());
+    DELEGATION_TOKEN_OPS.add(KerberosDelegationTokenAuthenticator.
+        DelegationTokenOperation.RENEWDELEGATIONTOKEN.toString());
+    DELEGATION_TOKEN_OPS.add(KerberosDelegationTokenAuthenticator.
+        DelegationTokenOperation.CANCELDELEGATIONTOKEN.toString());
+  }
+
+  private AuthenticationHandler authHandler;
+  private DelegationTokenManager tokenManager;
+  private String authType;
+
+  public DelegationTokenAuthenticationHandler(AuthenticationHandler handler) {
+    authHandler = handler;
+    authType = handler.getType();
+  }
+
+  @VisibleForTesting
+  DelegationTokenManager getTokenManager() {
+    return tokenManager;
+  }
+
+  @Override
+  public void init(Properties config) throws ServletException {
+    authHandler.init(config);
+    initTokenManager(config);
+  }
+
+  /**
+   * Sets an external <code>DelegationTokenSecretManager</code> instance to
+   * manage creation and verification of Delegation Tokens.
+   * <p/>
+   * This is useful for use cases where secrets must be shared across multiple
+   * services.
+   *
+   * @param secretManager a <code>DelegationTokenSecretManager</code> instance
+   */
+  public void setExternalDelegationTokenSecretManager(
+      AbstractDelegationTokenSecretManager secretManager) {
+    tokenManager.setExternalDelegationTokenSecretManager(secretManager);
+  }
+
+  @VisibleForTesting
+  @SuppressWarnings("unchecked")
+  public void initTokenManager(Properties config) {
+    String configPrefix = authHandler.getType() + ".";
+    Configuration conf = new Configuration(false);
+    for (Map.Entry entry : config.entrySet()) {
+      conf.set((String) entry.getKey(), (String) entry.getValue());
+    }
+    String tokenKind = conf.get(TOKEN_KIND);
+    if (tokenKind == null) {
+      throw new IllegalArgumentException(
+          "The configuration does not define the token kind");
+    }
+    tokenKind = tokenKind.trim();
+    long updateInterval = conf.getLong(configPrefix + UPDATE_INTERVAL,
+        UPDATE_INTERVAL_DEFAULT);
+    long maxLifeTime = conf.getLong(configPrefix + MAX_LIFETIME,
+        MAX_LIFETIME_DEFAULT);
+    long renewInterval = conf.getLong(configPrefix + RENEW_INTERVAL,
+        RENEW_INTERVAL_DEFAULT);
+    long removalScanInterval = conf.getLong(
+        configPrefix + REMOVAL_SCAN_INTERVAL, REMOVAL_SCAN_INTERVAL_DEFAULT);
+    tokenManager = new DelegationTokenManager(new Text(tokenKind),
+        updateInterval * 1000, maxLifeTime * 1000, renewInterval * 1000,
+        removalScanInterval * 1000);
+    tokenManager.init();
+  }
+
+  @Override
+  public void destroy() {
+    tokenManager.destroy();
+    authHandler.destroy();
+  }
+
+  @Override
+  public String getType() {
+    return authType;
+  }
+
+  private static final String ENTER = System.getProperty("line.separator");
+
+  @Override
+  @SuppressWarnings("unchecked")
+  public boolean managementOperation(AuthenticationToken token,
+      HttpServletRequest request, HttpServletResponse response)
+      throws IOException, AuthenticationException {
+    boolean requestContinues = true;
+    String op = ServletUtils.getParameter(request,
+        KerberosDelegationTokenAuthenticator.OP_PARAM);
+    op = (op != null) ? op.toUpperCase() : null;
+    if (DELEGATION_TOKEN_OPS.contains(op) &&
+        !request.getMethod().equals("OPTIONS")) {
+      KerberosDelegationTokenAuthenticator.DelegationTokenOperation dtOp =
+          KerberosDelegationTokenAuthenticator.
+              DelegationTokenOperation.valueOf(op);
+      if (dtOp.getHttpMethod().equals(request.getMethod())) {
+        boolean doManagement;
+        if (dtOp.requiresKerberosCredentials() && token == null) {
+          token = authenticate(request, response);
+          if (token == null) {
+            requestContinues = false;
+            doManagement = false;
+          } else {
+            doManagement = true;
+          }
+        } else {
+          doManagement = true;
+        }
+        if (doManagement) {
+          UserGroupInformation requestUgi = (token != null)
+              ? UserGroupInformation.createRemoteUser(token.getUserName())
+              : null;
+          Map map = null;
+          switch (dtOp) {
+            case GETDELEGATIONTOKEN:
+              if (requestUgi == null) {
+                throw new IllegalStateException("request UGI cannot be NULL");
+              }
+              String renewer = ServletUtils.getParameter(request,
+                  KerberosDelegationTokenAuthenticator.RENEWER_PARAM);
+              try {
+                Token<?> dToken = tokenManager.createToken(requestUgi, renewer);
+                map = delegationTokenToJSON(dToken);
+              } catch (IOException ex) {
+                throw new AuthenticationException(ex.toString(), ex);
+              }
+              break;
+            case RENEWDELEGATIONTOKEN:
+              if (requestUgi == null) {
+                throw new IllegalStateException("request UGI cannot be NULL");
+              }
+              String tokenToRenew = ServletUtils.getParameter(request,
+                  KerberosDelegationTokenAuthenticator.TOKEN_PARAM);
+              if (tokenToRenew == null) {
+                response.sendError(HttpServletResponse.SC_BAD_REQUEST,
+                    MessageFormat.format(
+                        "Operation [{0}] requires the parameter [{1}]", dtOp,
+                        KerberosDelegationTokenAuthenticator.TOKEN_PARAM)
+                );
+                requestContinues = false;
+              } else {
+                Token<DelegationTokenIdentifier> dt =
+                    new Token<DelegationTokenIdentifier>();
+                try {
+                  dt.decodeFromUrlString(tokenToRenew);
+                  long expirationTime = tokenManager.renewToken(dt,
+                      requestUgi.getShortUserName());
+                  map = new HashMap();
+                  map.put("long", expirationTime);
+                } catch (IOException ex) {
+                  throw new AuthenticationException(ex.toString(), ex);
+                }
+              }
+              break;
+            case CANCELDELEGATIONTOKEN:
+              String tokenToCancel = ServletUtils.getParameter(request,
+                  KerberosDelegationTokenAuthenticator.TOKEN_PARAM);
+              if (tokenToCancel == null) {
+                response.sendError(HttpServletResponse.SC_BAD_REQUEST,
+                    MessageFormat.format(
+                        "Operation [{0}] requires the parameter [{1}]", dtOp,
+                        KerberosDelegationTokenAuthenticator.TOKEN_PARAM)
+                );
+                requestContinues = false;
+              } else {
+                Token<DelegationTokenIdentifier> dt =
+                    new Token<DelegationTokenIdentifier>();
+                try {
+                  dt.decodeFromUrlString(tokenToCancel);
+                  tokenManager.cancelToken(dt, (requestUgi != null)
+                      ? requestUgi.getShortUserName() : null);
+                } catch (IOException ex) {
+                  response.sendError(HttpServletResponse.SC_NOT_FOUND,
+                      "Invalid delegation token, cannot cancel");
+                  requestContinues = false;
+                }
+              }
+              break;
+          }
+          if (requestContinues) {
+            response.setStatus(HttpServletResponse.SC_OK);
+            if (map != null) {
+              response.setContentType(MediaType.APPLICATION_JSON);
+              Writer writer = response.getWriter();
+              ObjectMapper jsonMapper = new ObjectMapper();
+              jsonMapper.writeValue(writer, map);
+              writer.write(ENTER);
+              writer.flush();
+            }
+            requestContinues = false;
+          }
+        }
+      } else {
+        response.sendError(HttpServletResponse.SC_BAD_REQUEST,
+            MessageFormat.format(
+                "Wrong HTTP method [{0}] for operation [{1}], it should be " +
+                    "[{2}]", request.getMethod(), dtOp, dtOp.getHttpMethod()));
+        requestContinues = false;
+      }
+    }
+    return requestContinues;
+  }
+
+  @SuppressWarnings("unchecked")
+  private static Map delegationTokenToJSON(Token token) throws IOException {
+    Map json = new LinkedHashMap();
+    json.put(
+        KerberosDelegationTokenAuthenticator.DELEGATION_TOKEN_URL_STRING_JSON,
+        token.encodeToUrlString());
+    Map response = new LinkedHashMap();
+    response.put(KerberosDelegationTokenAuthenticator.DELEGATION_TOKEN_JSON,
+        json);
+    return response;
+  }
+
+  /**
+   * Authenticates a request looking for the <code>delegation</code>
+   * query-string parameter and verifying it is a valid token. If there is not
+   * <code>delegation</code> query-string parameter, it delegates the
+   * authentication to the {@link KerberosAuthenticationHandler} unless it is
+   * disabled.
+   *
+   * @param request the HTTP client request.
+   * @param response the HTTP client response.
+   * @return the authentication token for the authenticated request.
+   * @throws IOException thrown if an IO error occurred.
+   * @throws AuthenticationException thrown if the authentication failed.
+   */
+  @Override
+  public AuthenticationToken authenticate(HttpServletRequest request,
+      HttpServletResponse response)
+      throws IOException, AuthenticationException {
+    AuthenticationToken token;
+    String delegationParam = ServletUtils.getParameter(request,
+        KerberosDelegationTokenAuthenticator.DELEGATION_PARAM);
+    if (delegationParam != null) {
+      try {
+        Token<DelegationTokenIdentifier> dt =
+            new Token<DelegationTokenIdentifier>();
+        dt.decodeFromUrlString(delegationParam);
+        UserGroupInformation ugi = tokenManager.verifyToken(dt);
+        final String shortName = ugi.getShortUserName();
+
+        // creating a ephemeral token
+        token = new AuthenticationToken(shortName, ugi.getUserName(),
+            getType());
+        token.setExpires(0);
+        request.setAttribute(DELEGATION_TOKEN_UGI_ATTRIBUTE, ugi);
+      } catch (Throwable ex) {
+        throw new AuthenticationException("Could not verify DelegationToken, " +
+            ex.toString(), ex);
+      }
+    } else {
+      token = authHandler.authenticate(request, response);
+    }
+    return token;
+  }
+
+}

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/token/delegation/web/DelegationTokenAuthenticator.java

@@ -0,0 +1,250 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.hadoop.security.token.delegation.web;
+
+import org.apache.hadoop.classification.InterfaceAudience;
+import org.apache.hadoop.classification.InterfaceStability;
+import org.apache.hadoop.security.SecurityUtil;
+import org.apache.hadoop.security.authentication.client.AuthenticatedURL;
+import org.apache.hadoop.security.authentication.client.AuthenticationException;
+import org.apache.hadoop.security.authentication.client.Authenticator;
+import org.apache.hadoop.security.authentication.client.ConnectionConfigurator;
+import org.apache.hadoop.security.token.Token;
+import org.apache.hadoop.security.token.delegation.AbstractDelegationTokenIdentifier;
+import org.codehaus.jackson.map.ObjectMapper;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.IOException;
+import java.net.HttpURLConnection;
+import java.net.InetSocketAddress;
+import java.net.URL;
+import java.net.URLEncoder;
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * {@link Authenticator} wrapper that enhances an {@link Authenticator} with
+ * Delegation Token support.
+ */
+@InterfaceAudience.Public
+@InterfaceStability.Evolving
+public abstract class DelegationTokenAuthenticator implements Authenticator {
+  private static Logger LOG = 
+      LoggerFactory.getLogger(DelegationTokenAuthenticator.class);
+  
+  private static final String CONTENT_TYPE = "Content-Type";
+  private static final String APPLICATION_JSON_MIME = "application/json";
+
+  private static final String HTTP_GET = "GET";
+  private static final String HTTP_PUT = "PUT";
+
+  public static final String OP_PARAM = "op";
+
+  public static final String DELEGATION_PARAM = "delegation";
+  public static final String TOKEN_PARAM = "token";
+  public static final String RENEWER_PARAM = "renewer";
+  public static final String DELEGATION_TOKEN_JSON = "Token";
+  public static final String DELEGATION_TOKEN_URL_STRING_JSON = "urlString";
+  public static final String RENEW_DELEGATION_TOKEN_JSON = "long";
+
+  /**
+   * DelegationToken operations.
+   */
+  @InterfaceAudience.Private
+  public static enum DelegationTokenOperation {
+    GETDELEGATIONTOKEN(HTTP_GET, true),
+    RENEWDELEGATIONTOKEN(HTTP_PUT, true),
+    CANCELDELEGATIONTOKEN(HTTP_PUT, false);
+
+    private String httpMethod;
+    private boolean requiresKerberosCredentials;
+
+    private DelegationTokenOperation(String httpMethod,
+        boolean requiresKerberosCredentials) {
+      this.httpMethod = httpMethod;
+      this.requiresKerberosCredentials = requiresKerberosCredentials;
+    }
+
+    public String getHttpMethod() {
+      return httpMethod;
+    }
+
+    public boolean requiresKerberosCredentials() {
+      return requiresKerberosCredentials;
+    }
+  }
+
+  private Authenticator authenticator;
+
+  public DelegationTokenAuthenticator(Authenticator authenticator) {
+    this.authenticator = authenticator;
+  }
+
+  @Override
+  public void setConnectionConfigurator(ConnectionConfigurator configurator) {
+    authenticator.setConnectionConfigurator(configurator);
+  }
+
+  private boolean hasDelegationToken(URL url) {
+    String queryStr = url.getQuery();
+    return (queryStr != null) && queryStr.contains(DELEGATION_PARAM + "=");
+  }
+
+  @Override
+  public void authenticate(URL url, AuthenticatedURL.Token token)
+      throws IOException, AuthenticationException {
+    if (!hasDelegationToken(url)) {
+      authenticator.authenticate(url, token);
+    }
+  }
+
+  /**
+   * Requests a delegation token using the configured <code>Authenticator</code>
+   * for authentication.
+   *
+   * @param url the URL to get the delegation token from. Only HTTP/S URLs are
+   * supported.
+   * @param token the authentication token being used for the user where the
+   * Delegation token will be stored.
+   * @throws IOException if an IO error occurred.
+   * @throws AuthenticationException if an authentication exception occurred.
+   */
+  public Token<AbstractDelegationTokenIdentifier> getDelegationToken(URL url,
+      AuthenticatedURL.Token token, String renewer)
+      throws IOException, AuthenticationException {
+    Map json = doDelegationTokenOperation(url, token,
+        DelegationTokenOperation.GETDELEGATIONTOKEN, renewer, null, true);
+    json = (Map) json.get(DELEGATION_TOKEN_JSON);
+    String tokenStr = (String) json.get(DELEGATION_TOKEN_URL_STRING_JSON);
+    Token<AbstractDelegationTokenIdentifier> dToken =
+        new Token<AbstractDelegationTokenIdentifier>();
+    dToken.decodeFromUrlString(tokenStr);
+    InetSocketAddress service = new InetSocketAddress(url.getHost(),
+        url.getPort());
+    SecurityUtil.setTokenService(dToken, service);
+    return dToken;
+  }
+
+  /**
+   * Renews a delegation token from the server end-point using the
+   * configured <code>Authenticator</code> for authentication.
+   *
+   * @param url the URL to renew the delegation token from. Only HTTP/S URLs are
+   * supported.
+   * @param token the authentication token with the Delegation Token to renew.
+   * @throws IOException if an IO error occurred.
+   * @throws AuthenticationException if an authentication exception occurred.
+   */
+  public long renewDelegationToken(URL url,
+      AuthenticatedURL.Token token,
+      Token<AbstractDelegationTokenIdentifier> dToken)
+      throws IOException, AuthenticationException {
+    Map json = doDelegationTokenOperation(url, token,
+        DelegationTokenOperation.RENEWDELEGATIONTOKEN, null, dToken, true);
+    return (Long) json.get(RENEW_DELEGATION_TOKEN_JSON);
+  }
+
+  /**
+   * Cancels a delegation token from the server end-point. It does not require
+   * being authenticated by the configured <code>Authenticator</code>.
+   *
+   * @param url the URL to cancel the delegation token from. Only HTTP/S URLs
+   * are supported.
+   * @param token the authentication token with the Delegation Token to cancel.
+   * @throws IOException if an IO error occurred.
+   */
+  public void cancelDelegationToken(URL url,
+      AuthenticatedURL.Token token,
+      Token<AbstractDelegationTokenIdentifier> dToken)
+      throws IOException {
+    try {
+      doDelegationTokenOperation(url, token,
+          DelegationTokenOperation.CANCELDELEGATIONTOKEN, null, dToken, false);
+    } catch (AuthenticationException ex) {
+      throw new IOException("This should not happen: " + ex.getMessage(), ex);
+    }
+  }
+
+  private Map doDelegationTokenOperation(URL url,
+      AuthenticatedURL.Token token, DelegationTokenOperation operation,
+      String renewer, Token<?> dToken, boolean hasResponse)
+      throws IOException, AuthenticationException {
+    Map ret = null;
+    Map<String, String> params = new HashMap<String, String>();
+    params.put(OP_PARAM, operation.toString());
+    if (renewer != null) {
+      params.put(RENEWER_PARAM, renewer);
+    }
+    if (dToken != null) {
+      params.put(TOKEN_PARAM, dToken.encodeToUrlString());
+    }
+    String urlStr = url.toExternalForm();
+    StringBuilder sb = new StringBuilder(urlStr);
+    String separator = (urlStr.contains("?")) ? "&" : "?";
+    for (Map.Entry<String, String> entry : params.entrySet()) {
+      sb.append(separator).append(entry.getKey()).append("=").
+          append(URLEncoder.encode(entry.getValue(), "UTF8"));
+      separator = "&";
+    }
+    url = new URL(sb.toString());
+    AuthenticatedURL aUrl = new AuthenticatedURL(this);
+    HttpURLConnection conn = aUrl.openConnection(url, token);
+    conn.setRequestMethod(operation.getHttpMethod());
+    validateResponse(conn, HttpURLConnection.HTTP_OK);
+    if (hasResponse) {
+      String contentType = conn.getHeaderField(CONTENT_TYPE);
+      contentType = (contentType != null) ? contentType.toLowerCase()
+                                          : null;
+      if (contentType != null &&
+          contentType.contains(APPLICATION_JSON_MIME)) {
+        try {
+          ObjectMapper mapper = new ObjectMapper();
+          ret = mapper.readValue(conn.getInputStream(), Map.class);
+        } catch (Exception ex) {
+          throw new AuthenticationException(String.format(
+              "'%s' did not handle the '%s' delegation token operation: %s",
+              url.getAuthority(), operation, ex.getMessage()), ex);
+        }
+      } else {
+        throw new AuthenticationException(String.format("'%s' did not " +
+                "respond with JSON to the '%s' delegation token operation",
+            url.getAuthority(), operation));
+      }
+    }
+    return ret;
+  }
+
+  @SuppressWarnings("unchecked")
+  private static void validateResponse(HttpURLConnection conn, int expected)
+      throws IOException {
+    int status = conn.getResponseCode();
+    if (status != expected) {
+      try {
+        conn.getInputStream().close();
+      } catch (IOException ex) {
+        //NOP
+      }
+      String msg = String.format("HTTP status, expected [%d], got [%d]: %s", 
+          expected, status, conn.getResponseMessage());
+      LOG.debug(msg);
+      throw new IOException(msg);
+    }
+  }
+
+}

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/token/delegation/web/DelegationTokenIdentifier.java

@@ -15,21 +15,24 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.apache.hadoop.lib.service;
+package org.apache.hadoop.security.token.delegation.web;
 
 import org.apache.hadoop.classification.InterfaceAudience;
-import org.apache.hadoop.hdfs.web.WebHdfsFileSystem;
+import org.apache.hadoop.classification.InterfaceStability;
 import org.apache.hadoop.io.Text;
 import org.apache.hadoop.security.token.delegation.AbstractDelegationTokenIdentifier;
 
 /**
- * HttpFS <code>DelegationTokenIdentifier</code> implementation.
+ * Concrete delegation token identifier used by {@link DelegationTokenManager},
+ * {@link KerberosDelegationTokenAuthenticationHandler} and
+ * {@link DelegationTokenAuthenticationFilter}.
  */
 @InterfaceAudience.Private
+@InterfaceStability.Evolving
 public class DelegationTokenIdentifier
-  extends AbstractDelegationTokenIdentifier {
+    extends AbstractDelegationTokenIdentifier {
 
-  private Text kind = WebHdfsFileSystem.TOKEN_KIND;
+  private Text kind;
 
   public DelegationTokenIdentifier(Text kind) {
     this.kind = kind;
@@ -50,8 +53,8 @@ public class DelegationTokenIdentifier
   }
 
   /**
-   * Returns the kind, <code>TOKEN_KIND</code>.
-   * @return returns <code>TOKEN_KIND</code>.
+   * Return the delegation token kind
+   * @return returns the delegation token kind
    */
   @Override
   public Text getKind() {

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/token/delegation/web/DelegationTokenManager.java

@@ -0,0 +1,153 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.hadoop.security.token.delegation.web;
+
+import org.apache.hadoop.classification.InterfaceAudience;
+import org.apache.hadoop.classification.InterfaceStability;
+import org.apache.hadoop.io.Text;
+import org.apache.hadoop.security.UserGroupInformation;
+import org.apache.hadoop.security.token.Token;
+import org.apache.hadoop.security.token.delegation.AbstractDelegationTokenSecretManager;
+
+import java.io.ByteArrayInputStream;
+import java.io.DataInputStream;
+import java.io.IOException;
+
+/**
+ * Delegation Token Manager used by the
+ * {@link KerberosDelegationTokenAuthenticationHandler}.
+ *
+ */
+@InterfaceAudience.Private
+@InterfaceStability.Evolving
+class DelegationTokenManager {
+
+  private static class DelegationTokenSecretManager
+      extends AbstractDelegationTokenSecretManager<DelegationTokenIdentifier> {
+
+    private Text tokenKind;
+
+    public DelegationTokenSecretManager(Text tokenKind,
+        long delegationKeyUpdateInterval,
+        long delegationTokenMaxLifetime,
+        long delegationTokenRenewInterval,
+        long delegationTokenRemoverScanInterval) {
+      super(delegationKeyUpdateInterval, delegationTokenMaxLifetime,
+          delegationTokenRenewInterval, delegationTokenRemoverScanInterval);
+      this.tokenKind = tokenKind;
+    }
+
+    @Override
+    public DelegationTokenIdentifier createIdentifier() {
+      return new DelegationTokenIdentifier(tokenKind);
+    }
+
+  }
+
+  private AbstractDelegationTokenSecretManager secretManager = null;
+  private boolean managedSecretManager;
+  private Text tokenKind;
+
+  public DelegationTokenManager(Text tokenKind,
+      long delegationKeyUpdateInterval,
+      long delegationTokenMaxLifetime,
+      long delegationTokenRenewInterval,
+      long delegationTokenRemoverScanInterval) {
+    this.secretManager = new DelegationTokenSecretManager(tokenKind,
+        delegationKeyUpdateInterval, delegationTokenMaxLifetime,
+        delegationTokenRenewInterval, delegationTokenRemoverScanInterval);
+    this.tokenKind = tokenKind;
+    managedSecretManager = true;
+  }
+
+  /**
+   * Sets an external <code>DelegationTokenSecretManager</code> instance to
+   * manage creation and verification of Delegation Tokens.
+   * <p/>
+   * This is useful for use cases where secrets must be shared across multiple
+   * services.
+   *
+   * @param secretManager a <code>DelegationTokenSecretManager</code> instance
+   */
+  public void setExternalDelegationTokenSecretManager(
+      AbstractDelegationTokenSecretManager secretManager) {
+    this.secretManager.stopThreads();
+    this.secretManager = secretManager;
+    this.tokenKind = secretManager.createIdentifier().getKind();
+    managedSecretManager = false;
+  }
+
+  public void init() {
+    if (managedSecretManager) {
+      try {
+        secretManager.startThreads();
+      } catch (IOException ex) {
+        throw new RuntimeException("Could not start " +
+            secretManager.getClass() + ": " + ex.toString(), ex);
+      }
+    }
+  }
+
+  public void destroy() {
+    if (managedSecretManager) {
+      secretManager.stopThreads();
+    }
+  }
+
+  @SuppressWarnings("unchecked")
+  public Token<DelegationTokenIdentifier> createToken(UserGroupInformation ugi,
+      String renewer) {
+    renewer = (renewer == null) ? ugi.getShortUserName() : renewer;
+    String user = ugi.getUserName();
+    Text owner = new Text(user);
+    Text realUser = null;
+    if (ugi.getRealUser() != null) {
+      realUser = new Text(ugi.getRealUser().getUserName());
+    }
+    DelegationTokenIdentifier tokenIdentifier = new DelegationTokenIdentifier(
+        tokenKind, owner, new Text(renewer), realUser);
+    return new Token<DelegationTokenIdentifier>(tokenIdentifier, secretManager);
+  }
+
+  @SuppressWarnings("unchecked")
+  public long renewToken(Token<DelegationTokenIdentifier> token, String renewer)
+      throws IOException {
+    return secretManager.renewToken(token, renewer);
+  }
+
+  @SuppressWarnings("unchecked")
+  public void cancelToken(Token<DelegationTokenIdentifier> token,
+      String canceler) throws IOException {
+    canceler = (canceler != null) ? canceler :
+               verifyToken(token).getShortUserName();
+    secretManager.cancelToken(token, canceler);
+  }
+
+  @SuppressWarnings("unchecked")
+  public UserGroupInformation verifyToken(Token<DelegationTokenIdentifier>
+      token) throws IOException {
+    ByteArrayInputStream buf = new ByteArrayInputStream(token.getIdentifier());
+    DataInputStream dis = new DataInputStream(buf);
+    DelegationTokenIdentifier id = new DelegationTokenIdentifier(tokenKind);
+    id.readFields(dis);
+    dis.close();
+    secretManager.verifyToken(id, token.getPassword());
+    return id.getUser();
+  }
+
+}

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/token/delegation/web/HttpUserGroupInformation.java

@@ -15,33 +15,29 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-
-package org.apache.hadoop.fs.http.client;
+package org.apache.hadoop.security.token.delegation.web;
 
 import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.security.UserGroupInformation;
-import org.apache.hadoop.security.authentication.client.PseudoAuthenticator;
 
-import java.io.IOException;
+import javax.servlet.http.HttpServletRequest;
 
 /**
- * A <code>PseudoAuthenticator</code> subclass that uses FileSystemAccess's
- * <code>UserGroupInformation</code> to obtain the client user name (the UGI's login user).
+ * Util class that returns the remote {@link UserGroupInformation} in scope
+ * for the HTTP request.
  */
 @InterfaceAudience.Private
-public class HttpFSPseudoAuthenticator extends PseudoAuthenticator {
+public class HttpUserGroupInformation {
 
   /**
-   * Return the client user name.
+   * Returns the remote {@link UserGroupInformation} in context for the current
+   * HTTP request, taking into account proxy user requests.
    *
-   * @return the client user name.
+   * @return the remote {@link UserGroupInformation}, <code>NULL</code> if none.
    */
-  @Override
-  protected String getUserName() {
-    try {
-      return UserGroupInformation.getLoginUser().getUserName();
-    } catch (IOException ex) {
-      throw new SecurityException("Could not obtain current user, " + ex.getMessage(), ex);
-    }
+  public static UserGroupInformation get() {
+    return DelegationTokenAuthenticationFilter.
+        getHttpUserGroupInformationInContext();
   }
+
 }

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/token/delegation/web/KerberosDelegationTokenAuthenticationHandler.java

@@ -0,0 +1,54 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.hadoop.security.token.delegation.web;
+
+import org.apache.hadoop.classification.InterfaceAudience;
+import org.apache.hadoop.classification.InterfaceStability;
+import org.apache.hadoop.security.authentication.server.AuthenticationHandler;
+import org.apache.hadoop.security.authentication.server.KerberosAuthenticationHandler;
+
+/**
+ * An {@link AuthenticationHandler} that implements Kerberos SPNEGO mechanism
+ * for HTTP and supports Delegation Token functionality.
+ * <p/>
+ * In addition to the {@link KerberosAuthenticationHandler} configuration
+ * properties, this handler supports:
+ * <ul>
+ * <li>kerberos.delegation-token.token-kind: the token kind for generated tokens
+ * (no default, required property).</li>
+ * <li>kerberos.delegation-token.update-interval.sec: secret manager master key
+ * update interval in seconds (default 1 day).</li>
+ * <li>kerberos.delegation-token.max-lifetime.sec: maximum life of a delegation
+ * token in seconds (default 7 days).</li>
+ * <li>kerberos.delegation-token.renewal-interval.sec: renewal interval for
+ * delegation tokens in seconds (default 1 day).</li>
+ * <li>kerberos.delegation-token.removal-scan-interval.sec: delegation tokens
+ * removal scan interval in seconds (default 1 hour).</li>
+ * </ul>
+ */
+@InterfaceAudience.Private
+@InterfaceStability.Evolving
+public class KerberosDelegationTokenAuthenticationHandler
+    extends DelegationTokenAuthenticationHandler {
+
+  public KerberosDelegationTokenAuthenticationHandler() {
+    super(new KerberosAuthenticationHandler(KerberosAuthenticationHandler.TYPE +
+        TYPE_POSTFIX));
+  }
+
+}

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/token/delegation/web/KerberosDelegationTokenAuthenticator.java

@@ -0,0 +1,46 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.hadoop.security.token.delegation.web;
+
+import org.apache.hadoop.classification.InterfaceAudience;
+import org.apache.hadoop.classification.InterfaceStability;
+import org.apache.hadoop.security.authentication.client.Authenticator;
+import org.apache.hadoop.security.authentication.client.KerberosAuthenticator;
+
+/**
+ * The <code>KerberosDelegationTokenAuthenticator</code> provides support for
+ * Kerberos SPNEGO authentication mechanism and support for Hadoop Delegation
+ * Token operations.
+ * <p/>
+ * It falls back to the {@link PseudoDelegationTokenAuthenticator} if the HTTP
+ * endpoint does not trigger a SPNEGO authentication
+ */
+@InterfaceAudience.Public
+@InterfaceStability.Evolving
+public class KerberosDelegationTokenAuthenticator
+    extends DelegationTokenAuthenticator {
+
+  public KerberosDelegationTokenAuthenticator() {
+    super(new KerberosAuthenticator() {
+      @Override
+      protected Authenticator getFallBackAuthenticator() {
+        return new PseudoDelegationTokenAuthenticator();
+      }
+    });
+  }
+}

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/token/delegation/web/PseudoDelegationTokenAuthenticationHandler.java

@@ -0,0 +1,55 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.hadoop.security.token.delegation.web;
+
+import org.apache.hadoop.classification.InterfaceAudience;
+import org.apache.hadoop.classification.InterfaceStability;
+import org.apache.hadoop.security.authentication.server.AuthenticationHandler;
+import org.apache.hadoop.security.authentication.server.KerberosAuthenticationHandler;
+import org.apache.hadoop.security.authentication.server.PseudoAuthenticationHandler;
+
+/**
+ * An {@link AuthenticationHandler} that implements Kerberos SPNEGO mechanism
+ * for HTTP and supports Delegation Token functionality.
+ * <p/>
+ * In addition to the {@link KerberosAuthenticationHandler} configuration
+ * properties, this handler supports:
+ * <ul>
+ * <li>simple.delegation-token.token-kind: the token kind for generated tokens
+ * (no default, required property).</li>
+ * <li>simple.delegation-token.update-interval.sec: secret manager master key
+ * update interval in seconds (default 1 day).</li>
+ * <li>simple.delegation-token.max-lifetime.sec: maximum life of a delegation
+ * token in seconds (default 7 days).</li>
+ * <li>simple.delegation-token.renewal-interval.sec: renewal interval for
+ * delegation tokens in seconds (default 1 day).</li>
+ * <li>simple.delegation-token.removal-scan-interval.sec: delegation tokens
+ * removal scan interval in seconds (default 1 hour).</li>
+ * </ul>
+ */
+@InterfaceAudience.Private
+@InterfaceStability.Evolving
+public class PseudoDelegationTokenAuthenticationHandler
+    extends DelegationTokenAuthenticationHandler {
+
+  public PseudoDelegationTokenAuthenticationHandler() {
+    super(new PseudoAuthenticationHandler(PseudoAuthenticationHandler.TYPE +
+        TYPE_POSTFIX));
+  }
+
+}

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/token/delegation/web/PseudoDelegationTokenAuthenticator.java

@@ -0,0 +1,54 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.hadoop.security.token.delegation.web;
+
+import org.apache.hadoop.classification.InterfaceAudience;
+import org.apache.hadoop.classification.InterfaceStability;
+import org.apache.hadoop.security.UserGroupInformation;
+import org.apache.hadoop.security.authentication.client.PseudoAuthenticator;
+
+import java.io.IOException;
+
+/**
+ * The <code>PseudoDelegationTokenAuthenticator</code> provides support for
+ * Hadoop's pseudo authentication mechanism that accepts
+ * the user name specified as a query string parameter and support for Hadoop
+ * Delegation Token operations.
+ * <p/>
+ * This mimics the model of Hadoop Simple authentication trusting the
+ * {@link UserGroupInformation#getCurrentUser()} value.
+ */
+@InterfaceAudience.Public
+@InterfaceStability.Evolving
+public class PseudoDelegationTokenAuthenticator
+    extends DelegationTokenAuthenticator {
+
+  public PseudoDelegationTokenAuthenticator() {
+    super(new PseudoAuthenticator() {
+      @Override
+      protected String getUserName() {
+        try {
+          return UserGroupInformation.getCurrentUser().getShortUserName();
+        } catch (IOException ex) {
+          throw new RuntimeException(ex);
+        }
+      }
+    });
+  }
+
+}

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/token/delegation/web/ServletUtils.java

@@ -0,0 +1,59 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.hadoop.security.token.delegation.web;
+
+import org.apache.hadoop.classification.InterfaceAudience;
+import org.apache.http.NameValuePair;
+import org.apache.http.client.utils.URLEncodedUtils;
+
+import javax.servlet.http.HttpServletRequest;
+import java.io.IOException;
+import java.nio.charset.Charset;
+import java.util.List;
+
+/**
+ * Servlet utility methods.
+ */
+@InterfaceAudience.Private
+class ServletUtils {
+  private static final Charset UTF8_CHARSET = Charset.forName("UTF-8");
+
+  /**
+   * Extract a query string parameter without triggering http parameters
+   * processing by the servlet container.
+   *
+   * @param request the request
+   * @param name the parameter to get the value.
+   * @return the parameter value, or <code>NULL</code> if the parameter is not
+   * defined.
+   * @throws IOException thrown if there was an error parsing the query string.
+   */
+  public static String getParameter(HttpServletRequest request, String name)
+      throws IOException {
+    List<NameValuePair> list = URLEncodedUtils.parse(request.getQueryString(),
+        UTF8_CHARSET);
+    if (list != null) {
+      for (NameValuePair nv : list) {
+        if (name.equals(nv.getName())) {
+          return nv.getValue();
+        }
+      }
+    }
+    return null;
+  }
+}

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/conf/TestConfiguration.java

@@ -178,6 +178,14 @@ public class TestConfiguration extends TestCase {
     // check that expansion also occurs for getInt()
     assertTrue(conf.getInt("intvar", -1) == 42);
     assertTrue(conf.getInt("my.int", -1) == 42);
+
+    Map<String, String> results = conf.getValByRegex("^my.*file$");
+    assertTrue(results.keySet().contains("my.relfile"));
+    assertTrue(results.keySet().contains("my.fullfile"));
+    assertTrue(results.keySet().contains("my.file"));
+    assertEquals(-1, results.get("my.relfile").indexOf("${"));
+    assertEquals(-1, results.get("my.fullfile").indexOf("${"));
+    assertEquals(-1, results.get("my.file").indexOf("${"));
   }
 
   public void testFinalParam() throws IOException {

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/crypto/key/TestKeyProviderFactory.java

@@ -220,11 +220,76 @@ public class TestKeyProviderFactory {
     assertTrue(s.getPermission().toString().equals("rwx------"));
     assertTrue(file + " should exist", file.isFile());
 
+    // Corrupt file and Check if JKS can reload from _OLD file
+    File oldFile = new File(file.getPath() + "_OLD");
+    file.renameTo(oldFile);
+    file.delete();
+    file.createNewFile();
+    assertTrue(oldFile.exists());
+    KeyProvider provider = KeyProviderFactory.getProviders(conf).get(0);
+    assertTrue(file.exists());
+    assertTrue(oldFile + "should be deleted", !oldFile.exists());
+    verifyAfterReload(file, provider);
+    assertTrue(!oldFile.exists());
+
+    // _NEW and current file should not exist together
+    File newFile = new File(file.getPath() + "_NEW");
+    newFile.createNewFile();
+    try {
+      provider = KeyProviderFactory.getProviders(conf).get(0);
+      Assert.fail("_NEW and current file should not exist together !!");
+    } catch (Exception e) {
+      // Ignore
+    } finally {
+      if (newFile.exists()) {
+        newFile.delete();
+      }
+    }
+
+    // Load from _NEW file
+    file.renameTo(newFile);
+    file.delete();
+    try {
+      provider = KeyProviderFactory.getProviders(conf).get(0);
+      Assert.assertFalse(newFile.exists());
+      Assert.assertFalse(oldFile.exists());
+    } catch (Exception e) {
+      Assert.fail("JKS should load from _NEW file !!");
+      // Ignore
+    }
+    verifyAfterReload(file, provider);
+
+    // _NEW exists but corrupt.. must load from _OLD
+    newFile.createNewFile();
+    file.renameTo(oldFile);
+    file.delete();
+    try {
+      provider = KeyProviderFactory.getProviders(conf).get(0);
+      Assert.assertFalse(newFile.exists());
+      Assert.assertFalse(oldFile.exists());
+    } catch (Exception e) {
+      Assert.fail("JKS should load from _OLD file !!");
+      // Ignore
+    } finally {
+      if (newFile.exists()) {
+        newFile.delete();
+      }
+    }
+    verifyAfterReload(file, provider);
+
     // check permission retention after explicit change
     fs.setPermission(path, new FsPermission("777"));
     checkPermissionRetention(conf, ourUrl, path);
   }
 
+  private void verifyAfterReload(File file, KeyProvider provider)
+      throws IOException {
+    List<String> existingKeys = provider.getKeys();
+    assertTrue(existingKeys.contains("key4"));
+    assertTrue(existingKeys.contains("key3"));
+    assertTrue(file.exists());
+  }
+
   public void checkPermissionRetention(Configuration conf, String ourUrl, Path path) throws Exception {
     KeyProvider provider = KeyProviderFactory.getProviders(conf).get(0);
     // let's add a new key and flush and check that permissions are still set to 777

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/fs/TestPath.java

@@ -26,13 +26,11 @@ import java.util.Arrays;
 
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.io.AvroTestUtil;
-import org.apache.hadoop.test.GenericTestUtils;
 import org.apache.hadoop.util.Shell;
 
 import com.google.common.base.Joiner;
 
 import junit.framework.TestCase;
-import static org.junit.Assert.fail;
 
 public class TestPath extends TestCase {
   /**
@@ -307,28 +305,6 @@ public class TestPath extends TestCase {
     // if the child uri is absolute path
     assertEquals("foo://bar/fud#boo", new Path(new Path(new URI(
         "foo://bar/baz#bud")), new Path(new URI("/fud#boo"))).toString());
-
-    // empty URI
-    URI uri3 = new URI("");
-    assertEquals("", uri3.toString());
-    try {
-      path = new Path(uri3);
-      fail("Expected exception for empty URI");
-    } catch (IllegalArgumentException e) {
-      // expect to receive an IllegalArgumentException
-      GenericTestUtils.assertExceptionContains("Can not create a Path"
-          + " from an empty URI", e);
-    }
-    // null URI
-    uri3 = null;
-    try {
-      path = new Path(uri3);
-      fail("Expected exception for null URI");
-    } catch (IllegalArgumentException e) {
-      // expect to receive an IllegalArgumentException
-      GenericTestUtils.assertExceptionContains("Can not create a Path"
-          + " from a null URI", e);
-    }
   }
 
   /** Test URIs created from Path objects */

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/security/token/delegation/web/TestDelegationTokenAuthenticationHandlerWithMocks.java

@@ -0,0 +1,326 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.hadoop.security.token.delegation.web;
+
+import org.apache.hadoop.io.Text;
+import org.apache.hadoop.security.UserGroupInformation;
+import org.apache.hadoop.security.authentication.client.AuthenticationException;
+import org.apache.hadoop.security.authentication.client.KerberosAuthenticator;
+import org.apache.hadoop.security.authentication.server.AuthenticationHandler;
+import org.apache.hadoop.security.authentication.server.AuthenticationToken;
+import org.apache.hadoop.security.token.SecretManager;
+import org.apache.hadoop.security.token.Token;
+import org.codehaus.jackson.map.ObjectMapper;
+import org.junit.After;
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.Test;
+import org.mockito.Mockito;
+
+import javax.servlet.ServletException;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import javax.ws.rs.core.MediaType;
+import java.io.IOException;
+import java.io.PrintWriter;
+import java.io.StringWriter;
+import java.util.Map;
+import java.util.Properties;
+
+public class TestDelegationTokenAuthenticationHandlerWithMocks {
+
+  public static class MockDelegationTokenAuthenticationHandler
+      extends DelegationTokenAuthenticationHandler {
+
+    public MockDelegationTokenAuthenticationHandler() {
+      super(new AuthenticationHandler() {
+        @Override
+        public String getType() {
+          return "T";
+        }
+
+        @Override
+        public void init(Properties config) throws ServletException {
+
+        }
+
+        @Override
+        public void destroy() {
+
+        }
+
+        @Override
+        public boolean managementOperation(AuthenticationToken token,
+            HttpServletRequest request, HttpServletResponse response)
+            throws IOException, AuthenticationException {
+          return false;
+        }
+
+        @Override
+        public AuthenticationToken authenticate(HttpServletRequest request,
+            HttpServletResponse response)
+            throws IOException, AuthenticationException {
+          response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
+          response.setHeader(KerberosAuthenticator.WWW_AUTHENTICATE, "mock");
+          return null;
+        }
+      });
+    }
+
+  }
+
+  private DelegationTokenAuthenticationHandler handler;
+
+  @Before
+  public void setUp() throws Exception {
+    Properties conf = new Properties();
+
+    conf.put(KerberosDelegationTokenAuthenticationHandler.TOKEN_KIND, "foo");
+    handler = new MockDelegationTokenAuthenticationHandler();
+    handler.initTokenManager(conf);
+  }
+
+  @After
+  public void cleanUp() {
+      handler.destroy();
+  }
+
+  @Test
+  public void testManagementOperations() throws Exception {
+      testNonManagementOperation();
+      testManagementOperationErrors();
+      testGetToken(null, new Text("foo"));
+      testGetToken("bar", new Text("foo"));
+      testCancelToken();
+      testRenewToken();
+  }
+
+  private void testNonManagementOperation() throws Exception {
+    HttpServletRequest request = Mockito.mock(HttpServletRequest.class);
+    Mockito.when(request.getParameter(
+        DelegationTokenAuthenticator.OP_PARAM)).thenReturn(null);
+    Assert.assertTrue(handler.managementOperation(null, request, null));
+    Mockito.when(request.getParameter(
+        DelegationTokenAuthenticator.OP_PARAM)).thenReturn("CREATE");
+    Assert.assertTrue(handler.managementOperation(null, request, null));
+  }
+
+  private void testManagementOperationErrors() throws Exception {
+    HttpServletRequest request = Mockito.mock(HttpServletRequest.class);
+    HttpServletResponse response = Mockito.mock(HttpServletResponse.class);
+    Mockito.when(request.getQueryString()).thenReturn(
+        DelegationTokenAuthenticator.OP_PARAM + "=" +
+            DelegationTokenAuthenticator.DelegationTokenOperation.
+                GETDELEGATIONTOKEN.toString()
+    );
+    Mockito.when(request.getMethod()).thenReturn("FOO");
+    Assert.assertFalse(handler.managementOperation(null, request, response));
+    Mockito.verify(response).sendError(
+        Mockito.eq(HttpServletResponse.SC_BAD_REQUEST),
+        Mockito.startsWith("Wrong HTTP method"));
+
+    Mockito.reset(response);
+    Mockito.when(request.getMethod()).thenReturn(
+        DelegationTokenAuthenticator.DelegationTokenOperation.
+            GETDELEGATIONTOKEN.getHttpMethod()
+    );
+    Assert.assertFalse(handler.managementOperation(null, request, response));
+    Mockito.verify(response).setStatus(
+        Mockito.eq(HttpServletResponse.SC_UNAUTHORIZED));
+    Mockito.verify(response).setHeader(
+        Mockito.eq(KerberosAuthenticator.WWW_AUTHENTICATE),
+        Mockito.eq("mock"));
+  }
+
+  private void testGetToken(String renewer, Text expectedTokenKind)
+      throws Exception {
+    DelegationTokenAuthenticator.DelegationTokenOperation op =
+        DelegationTokenAuthenticator.DelegationTokenOperation.
+            GETDELEGATIONTOKEN;
+    HttpServletRequest request = Mockito.mock(HttpServletRequest.class);
+    HttpServletResponse response = Mockito.mock(HttpServletResponse.class);
+    Mockito.when(request.getQueryString()).
+        thenReturn(DelegationTokenAuthenticator.OP_PARAM + "=" + op.toString());
+    Mockito.when(request.getMethod()).thenReturn(op.getHttpMethod());
+
+    AuthenticationToken token = Mockito.mock(AuthenticationToken.class);
+    Mockito.when(token.getUserName()).thenReturn("user");
+    Mockito.when(response.getWriter()).thenReturn(new PrintWriter(
+        new StringWriter()));
+    Assert.assertFalse(handler.managementOperation(token, request, response));
+
+    Mockito.when(request.getQueryString()).
+        thenReturn(DelegationTokenAuthenticator.OP_PARAM + "=" + op.toString() +
+        "&" + DelegationTokenAuthenticator.RENEWER_PARAM + "=" + renewer);
+
+    Mockito.reset(response);
+    Mockito.reset(token);
+    Mockito.when(token.getUserName()).thenReturn("user");
+    StringWriter writer = new StringWriter();
+    PrintWriter pwriter = new PrintWriter(writer);
+    Mockito.when(response.getWriter()).thenReturn(pwriter);
+    Assert.assertFalse(handler.managementOperation(token, request, response));
+    if (renewer == null) {
+      Mockito.verify(token).getUserName();
+    } else {
+      Mockito.verify(token).getUserName();
+    }
+    Mockito.verify(response).setStatus(HttpServletResponse.SC_OK);
+    Mockito.verify(response).setContentType(MediaType.APPLICATION_JSON);
+    pwriter.close();
+    String responseOutput = writer.toString();
+    String tokenLabel = DelegationTokenAuthenticator.
+        DELEGATION_TOKEN_JSON;
+    Assert.assertTrue(responseOutput.contains(tokenLabel));
+    Assert.assertTrue(responseOutput.contains(
+        DelegationTokenAuthenticator.DELEGATION_TOKEN_URL_STRING_JSON));
+    ObjectMapper jsonMapper = new ObjectMapper();
+    Map json = jsonMapper.readValue(responseOutput, Map.class);
+    json = (Map) json.get(tokenLabel);
+    String tokenStr;
+    tokenStr = (String) json.get(DelegationTokenAuthenticator.
+        DELEGATION_TOKEN_URL_STRING_JSON);
+    Token<DelegationTokenIdentifier> dt = new Token<DelegationTokenIdentifier>();
+    dt.decodeFromUrlString(tokenStr);
+    handler.getTokenManager().verifyToken(dt);
+    Assert.assertEquals(expectedTokenKind, dt.getKind());
+  }
+
+  private void testCancelToken() throws Exception {
+    DelegationTokenAuthenticator.DelegationTokenOperation op =
+        DelegationTokenAuthenticator.DelegationTokenOperation.
+            CANCELDELEGATIONTOKEN;
+    HttpServletRequest request = Mockito.mock(HttpServletRequest.class);
+    HttpServletResponse response = Mockito.mock(HttpServletResponse.class);
+    Mockito.when(request.getQueryString()).thenReturn(
+        DelegationTokenAuthenticator.OP_PARAM + "=" + op.toString());
+    Mockito.when(request.getMethod()).
+        thenReturn(op.getHttpMethod());
+
+    Assert.assertFalse(handler.managementOperation(null, request, response));
+    Mockito.verify(response).sendError(
+        Mockito.eq(HttpServletResponse.SC_BAD_REQUEST),
+        Mockito.contains("requires the parameter [token]"));
+
+    Mockito.reset(response);
+    Token<DelegationTokenIdentifier> token =
+        handler.getTokenManager().createToken(
+            UserGroupInformation.getCurrentUser(), "foo");
+    Mockito.when(request.getQueryString()).thenReturn(
+        DelegationTokenAuthenticator.OP_PARAM + "=" + op.toString() + "&" +
+            DelegationTokenAuthenticator.TOKEN_PARAM + "=" +
+            token.encodeToUrlString());
+    Assert.assertFalse(handler.managementOperation(null, request, response));
+    Mockito.verify(response).setStatus(HttpServletResponse.SC_OK);
+    try {
+      handler.getTokenManager().verifyToken(token);
+      Assert.fail();
+    } catch (SecretManager.InvalidToken ex) {
+      //NOP
+    } catch (Throwable ex) {
+      Assert.fail();
+    }
+  }
+
+  private void testRenewToken() throws Exception {
+    DelegationTokenAuthenticator.DelegationTokenOperation op =
+        DelegationTokenAuthenticator.DelegationTokenOperation.
+            RENEWDELEGATIONTOKEN;
+    HttpServletRequest request = Mockito.mock(HttpServletRequest.class);
+    HttpServletResponse response = Mockito.mock(HttpServletResponse.class);
+    Mockito.when(request.getQueryString()).
+        thenReturn(DelegationTokenAuthenticator.OP_PARAM + "=" + op.toString());
+    Mockito.when(request.getMethod()).
+        thenReturn(op.getHttpMethod());
+
+    Assert.assertFalse(handler.managementOperation(null, request, response));
+    Mockito.verify(response).setStatus(
+        Mockito.eq(HttpServletResponse.SC_UNAUTHORIZED));
+    Mockito.verify(response).setHeader(Mockito.eq(
+            KerberosAuthenticator.WWW_AUTHENTICATE),
+        Mockito.eq("mock")
+    );
+
+    Mockito.reset(response);
+    AuthenticationToken token = Mockito.mock(AuthenticationToken.class);
+    Mockito.when(token.getUserName()).thenReturn("user");
+    Assert.assertFalse(handler.managementOperation(token, request, response));
+    Mockito.verify(response).sendError(
+        Mockito.eq(HttpServletResponse.SC_BAD_REQUEST),
+        Mockito.contains("requires the parameter [token]"));
+
+    Mockito.reset(response);
+    StringWriter writer = new StringWriter();
+    PrintWriter pwriter = new PrintWriter(writer);
+    Mockito.when(response.getWriter()).thenReturn(pwriter);
+    Token<DelegationTokenIdentifier> dToken =
+        handler.getTokenManager().createToken(
+            UserGroupInformation.getCurrentUser(), "user");
+    Mockito.when(request.getQueryString()).
+        thenReturn(DelegationTokenAuthenticator.OP_PARAM + "=" + op.toString() +
+        "&" + DelegationTokenAuthenticator.TOKEN_PARAM + "=" +
+        dToken.encodeToUrlString());
+    Assert.assertFalse(handler.managementOperation(token, request, response));
+    Mockito.verify(response).setStatus(HttpServletResponse.SC_OK);
+    pwriter.close();
+    Assert.assertTrue(writer.toString().contains("long"));
+    handler.getTokenManager().verifyToken(dToken);
+  }
+
+  @Test
+  public void testAuthenticate() throws Exception {
+    testValidDelegationToken();
+    testInvalidDelegationToken();
+  }
+
+  private void testValidDelegationToken() throws Exception {
+    HttpServletRequest request = Mockito.mock(HttpServletRequest.class);
+    HttpServletResponse response = Mockito.mock(HttpServletResponse.class);
+    Token<DelegationTokenIdentifier> dToken =
+        handler.getTokenManager().createToken(
+            UserGroupInformation.getCurrentUser(), "user");
+    Mockito.when(request.getQueryString()).thenReturn(
+        DelegationTokenAuthenticator.DELEGATION_PARAM + "=" +
+        dToken.encodeToUrlString());
+
+    AuthenticationToken token = handler.authenticate(request, response);
+    Assert.assertEquals(UserGroupInformation.getCurrentUser().
+            getShortUserName(), token.getUserName());
+    Assert.assertEquals(0, token.getExpires());
+    Assert.assertEquals(handler.getType(),
+        token.getType());
+    Assert.assertTrue(token.isExpired());
+  }
+
+  private void testInvalidDelegationToken() throws Exception {
+    HttpServletRequest request = Mockito.mock(HttpServletRequest.class);
+    HttpServletResponse response = Mockito.mock(HttpServletResponse.class);
+    Mockito.when(request.getQueryString()).thenReturn(
+        DelegationTokenAuthenticator.DELEGATION_PARAM + "=invalid");
+
+    try {
+      handler.authenticate(request, response);
+      Assert.fail();
+    } catch (AuthenticationException ex) {
+      //NOP
+    } catch (Exception ex) {
+      Assert.fail();
+    }
+  }
+
+}

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/security/token/delegation/web/TestDelegationTokenManager.java

@@ -0,0 +1,59 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.hadoop.security.token.delegation.web;
+
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.io.Text;
+import org.apache.hadoop.security.UserGroupInformation;
+import org.apache.hadoop.security.token.Token;
+import org.apache.hadoop.util.StringUtils;
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.io.IOException;
+import java.net.InetAddress;
+import java.net.InetSocketAddress;
+import java.util.Arrays;
+
+public class TestDelegationTokenManager {
+
+  private static final long DAY_IN_SECS = 86400;
+
+  @Test
+  public void testDTManager() throws Exception {
+    DelegationTokenManager tm = new DelegationTokenManager(new Text("foo"),
+        DAY_IN_SECS, DAY_IN_SECS, DAY_IN_SECS, DAY_IN_SECS);
+    tm.init();
+    Token<DelegationTokenIdentifier> token =
+        tm.createToken(UserGroupInformation.getCurrentUser(), "foo");
+    Assert.assertNotNull(token);
+    tm.verifyToken(token);
+    Assert.assertTrue(tm.renewToken(token, "foo") > System.currentTimeMillis());
+    tm.cancelToken(token, "foo");
+    try {
+      tm.verifyToken(token);
+      Assert.fail();
+    } catch (IOException ex) {
+      //NOP
+    } catch (Exception ex) {
+      Assert.fail();
+    }
+    tm.destroy();
+  }
+
+}

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/security/token/delegation/web/TestWebDelegationToken.java

@@ -0,0 +1,869 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.hadoop.security.token.delegation.web;
+
+import org.apache.commons.io.IOUtils;
+import org.apache.hadoop.io.Text;
+import org.apache.hadoop.minikdc.MiniKdc;
+import org.apache.hadoop.security.UserGroupInformation;
+import org.apache.hadoop.security.authentication.client.AuthenticationException;
+import org.apache.hadoop.security.authentication.client.KerberosAuthenticator;
+import org.apache.hadoop.security.authentication.server.AuthenticationFilter;
+import org.apache.hadoop.security.authentication.server.AuthenticationHandler;
+import org.apache.hadoop.security.authentication.server.AuthenticationToken;
+import org.apache.hadoop.security.authentication.server.KerberosAuthenticationHandler;
+import org.apache.hadoop.security.authentication.server.PseudoAuthenticationHandler;
+import org.apache.hadoop.security.authentication.util.KerberosUtil;
+import org.apache.hadoop.security.token.delegation.AbstractDelegationTokenSecretManager;
+import org.codehaus.jackson.map.ObjectMapper;
+import org.junit.After;
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.Test;
+import org.mortbay.jetty.Connector;
+import org.mortbay.jetty.Server;
+import org.mortbay.jetty.servlet.Context;
+import org.mortbay.jetty.servlet.FilterHolder;
+import org.mortbay.jetty.servlet.ServletHolder;
+
+import javax.security.auth.Subject;
+import javax.security.auth.kerberos.KerberosPrincipal;
+import javax.security.auth.login.AppConfigurationEntry;
+import javax.security.auth.login.Configuration;
+import javax.security.auth.login.LoginContext;
+import javax.servlet.Filter;
+import javax.servlet.FilterConfig;
+import javax.servlet.ServletException;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import java.io.File;
+import java.io.IOException;
+import java.io.Writer;
+import java.net.HttpURLConnection;
+import java.net.InetAddress;
+import java.net.ServerSocket;
+import java.net.URL;
+import java.security.Principal;
+import java.security.PrivilegedActionException;
+import java.security.PrivilegedExceptionAction;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Properties;
+import java.util.Set;
+import java.util.UUID;
+import java.util.concurrent.Callable;
+
+public class TestWebDelegationToken {
+  private static final String OK_USER = "ok-user";
+  private static final String FAIL_USER = "fail-user";
+  private static final String FOO_USER = "foo";
+  
+  private Server jetty;
+
+  public static class DummyAuthenticationHandler
+      implements AuthenticationHandler {
+    @Override
+    public String getType() {
+      return "dummy";
+    }
+
+    @Override
+    public void init(Properties config) throws ServletException {
+    }
+
+    @Override
+    public void destroy() {
+    }
+
+    @Override
+    public boolean managementOperation(AuthenticationToken token,
+        HttpServletRequest request, HttpServletResponse response)
+        throws IOException, AuthenticationException {
+      return false;
+    }
+
+    @Override
+    public AuthenticationToken authenticate(HttpServletRequest request,
+        HttpServletResponse response)
+        throws IOException, AuthenticationException {
+      AuthenticationToken token = null;
+      if (request.getParameter("authenticated") != null) {
+        token = new AuthenticationToken(request.getParameter("authenticated"),
+            "U", "test");
+      } else {
+        response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
+        response.setHeader(KerberosAuthenticator.WWW_AUTHENTICATE, "dummy");
+      }
+      return token;
+    }
+  }
+
+  public static class DummyDelegationTokenAuthenticationHandler extends
+      DelegationTokenAuthenticationHandler {
+    public DummyDelegationTokenAuthenticationHandler() {
+      super(new DummyAuthenticationHandler());
+    }
+
+    @Override
+    public void init(Properties config) throws ServletException {
+      Properties conf = new Properties(config);
+      conf.setProperty(TOKEN_KIND, "token-kind");
+      initTokenManager(conf);
+    }
+  }
+
+  public static class AFilter extends DelegationTokenAuthenticationFilter {
+
+    @Override
+    protected Properties getConfiguration(String configPrefix,
+        FilterConfig filterConfig) {
+      Properties conf = new Properties();
+      conf.setProperty(AUTH_TYPE,
+          DummyDelegationTokenAuthenticationHandler.class.getName());
+      return conf;
+    }
+  }
+
+  public static class PingServlet extends HttpServlet {
+
+    @Override
+    protected void doGet(HttpServletRequest req, HttpServletResponse resp)
+        throws ServletException, IOException {
+      resp.setStatus(HttpServletResponse.SC_OK);
+      resp.getWriter().write("ping");
+    }
+
+    @Override
+    protected void doPost(HttpServletRequest req, HttpServletResponse resp)
+        throws ServletException, IOException {
+      Writer writer = resp.getWriter();
+      writer.write("ping: ");
+      IOUtils.copy(req.getReader(), writer);
+      resp.setStatus(HttpServletResponse.SC_OK);
+    }
+  }
+
+  protected Server createJettyServer() {
+    try {
+      InetAddress localhost = InetAddress.getLocalHost();
+      ServerSocket ss = new ServerSocket(0, 50, localhost);
+      int port = ss.getLocalPort();
+      ss.close();
+      jetty = new Server(0);
+      jetty.getConnectors()[0].setHost("localhost");
+      jetty.getConnectors()[0].setPort(port);
+      return jetty;
+    } catch (Exception ex) {
+      throw new RuntimeException("Could not setup Jetty: " + ex.getMessage(),
+          ex);
+    }
+  }
+
+  protected String getJettyURL() {
+    Connector c = jetty.getConnectors()[0];
+    return "http://" + c.getHost() + ":" + c.getPort();
+  }
+
+  @Before
+  public void setUp() throws Exception {
+    // resetting hadoop security to simple
+    org.apache.hadoop.conf.Configuration conf =
+        new org.apache.hadoop.conf.Configuration();
+    UserGroupInformation.setConfiguration(conf);
+
+    jetty = createJettyServer();
+  }
+
+  @After
+  public void cleanUp() throws Exception {
+    jetty.stop();
+
+    // resetting hadoop security to simple
+    org.apache.hadoop.conf.Configuration conf =
+        new org.apache.hadoop.conf.Configuration();
+    UserGroupInformation.setConfiguration(conf);
+  }
+
+  protected Server getJetty() {
+    return jetty;
+  }
+
+  @Test
+  public void testRawHttpCalls() throws Exception {
+    final Server jetty = createJettyServer();
+    Context context = new Context();
+    context.setContextPath("/foo");
+    jetty.setHandler(context);
+    context.addFilter(new FilterHolder(AFilter.class), "/*", 0);
+    context.addServlet(new ServletHolder(PingServlet.class), "/bar");
+    try {
+      jetty.start();
+      URL nonAuthURL = new URL(getJettyURL() + "/foo/bar");
+      URL authURL = new URL(getJettyURL() + "/foo/bar?authenticated=foo");
+
+      // unauthenticated access to URL
+      HttpURLConnection conn = (HttpURLConnection) nonAuthURL.openConnection();
+      Assert.assertEquals(HttpURLConnection.HTTP_UNAUTHORIZED,
+          conn.getResponseCode());
+
+      // authenticated access to URL
+      conn = (HttpURLConnection) authURL.openConnection();
+      Assert.assertEquals(HttpURLConnection.HTTP_OK, conn.getResponseCode());
+
+      // unauthenticated access to get delegation token
+      URL url = new URL(nonAuthURL.toExternalForm() + "?op=GETDELEGATIONTOKEN");
+      conn = (HttpURLConnection) url.openConnection();
+      Assert.assertEquals(HttpURLConnection.HTTP_UNAUTHORIZED,
+          conn.getResponseCode());
+
+      // authenticated access to get delegation token
+      url = new URL(authURL.toExternalForm() +
+          "&op=GETDELEGATIONTOKEN&renewer=foo");
+      conn = (HttpURLConnection) url.openConnection();
+      Assert.assertEquals(HttpURLConnection.HTTP_OK, conn.getResponseCode());
+      ObjectMapper mapper = new ObjectMapper();
+      Map map = mapper.readValue(conn.getInputStream(), Map.class);
+      String dt = (String) ((Map) map.get("Token")).get("urlString");
+      Assert.assertNotNull(dt);
+
+      // delegation token access to URL
+      url = new URL(nonAuthURL.toExternalForm() + "?delegation=" + dt);
+      conn = (HttpURLConnection) url.openConnection();
+      Assert.assertEquals(HttpURLConnection.HTTP_OK, conn.getResponseCode());
+
+      // delegation token and authenticated access to URL
+      url = new URL(authURL.toExternalForm() + "&delegation=" + dt);
+      conn = (HttpURLConnection) url.openConnection();
+      Assert.assertEquals(HttpURLConnection.HTTP_OK, conn.getResponseCode());
+
+      // renewew delegation token, unauthenticated access to URL
+      url = new URL(nonAuthURL.toExternalForm() +
+          "?op=RENEWDELEGATIONTOKEN&token=" + dt);
+      conn = (HttpURLConnection) url.openConnection();
+      conn.setRequestMethod("PUT");
+      Assert.assertEquals(HttpURLConnection.HTTP_UNAUTHORIZED,
+          conn.getResponseCode());
+
+      // renewew delegation token, authenticated access to URL
+      url = new URL(authURL.toExternalForm() +
+          "&op=RENEWDELEGATIONTOKEN&token=" + dt);
+      conn = (HttpURLConnection) url.openConnection();
+      conn.setRequestMethod("PUT");
+      Assert.assertEquals(HttpURLConnection.HTTP_OK, conn.getResponseCode());
+
+      // renewew delegation token, authenticated access to URL, not renewer
+      url = new URL(getJettyURL() +
+          "/foo/bar?authenticated=bar&op=RENEWDELEGATIONTOKEN&token=" + dt);
+      conn = (HttpURLConnection) url.openConnection();
+      conn.setRequestMethod("PUT");
+      Assert.assertEquals(HttpURLConnection.HTTP_FORBIDDEN,
+          conn.getResponseCode());
+
+      // cancel delegation token, nonauthenticated access to URL
+      url = new URL(nonAuthURL.toExternalForm() +
+          "?op=CANCELDELEGATIONTOKEN&token=" + dt);
+      conn = (HttpURLConnection) url.openConnection();
+      conn.setRequestMethod("PUT");
+      Assert.assertEquals(HttpURLConnection.HTTP_OK, conn.getResponseCode());
+
+      // cancel canceled delegation token, nonauthenticated access to URL
+      url = new URL(nonAuthURL.toExternalForm() +
+          "?op=CANCELDELEGATIONTOKEN&token=" + dt);
+      conn = (HttpURLConnection) url.openConnection();
+      conn.setRequestMethod("PUT");
+      Assert.assertEquals(HttpURLConnection.HTTP_NOT_FOUND,
+          conn.getResponseCode());
+
+      // get new delegation token
+      url = new URL(authURL.toExternalForm() +
+          "&op=GETDELEGATIONTOKEN&renewer=foo");
+      conn = (HttpURLConnection) url.openConnection();
+      Assert.assertEquals(HttpURLConnection.HTTP_OK, conn.getResponseCode());
+      mapper = new ObjectMapper();
+      map = mapper.readValue(conn.getInputStream(), Map.class);
+      dt = (String) ((Map) map.get("Token")).get("urlString");
+      Assert.assertNotNull(dt);
+
+      // cancel delegation token, authenticated access to URL
+      url = new URL(authURL.toExternalForm() +
+          "&op=CANCELDELEGATIONTOKEN&token=" + dt);
+      conn = (HttpURLConnection) url.openConnection();
+      conn.setRequestMethod("PUT");
+      Assert.assertEquals(HttpURLConnection.HTTP_OK, conn.getResponseCode());
+    } finally {
+      jetty.stop();
+    }
+  }
+
+  @Test
+  public void testDelegationTokenAuthenticatorCalls() throws Exception {
+    final Server jetty = createJettyServer();
+    Context context = new Context();
+    context.setContextPath("/foo");
+    jetty.setHandler(context);
+    context.addFilter(new FilterHolder(AFilter.class), "/*", 0);
+    context.addServlet(new ServletHolder(PingServlet.class), "/bar");
+
+    try {
+      jetty.start();
+      URL nonAuthURL = new URL(getJettyURL() + "/foo/bar");
+      URL authURL = new URL(getJettyURL() + "/foo/bar?authenticated=foo");
+      URL authURL2 = new URL(getJettyURL() + "/foo/bar?authenticated=bar");
+
+      DelegationTokenAuthenticatedURL.Token token =
+          new DelegationTokenAuthenticatedURL.Token();
+      DelegationTokenAuthenticatedURL aUrl =
+          new DelegationTokenAuthenticatedURL();
+
+      try {
+        aUrl.getDelegationToken(nonAuthURL, token, FOO_USER);
+        Assert.fail();
+      } catch (Exception ex) {
+        Assert.assertTrue(ex.getMessage().contains("401"));
+      }
+
+      aUrl.getDelegationToken(authURL, token, FOO_USER);
+      Assert.assertNotNull(token.getDelegationToken());
+      Assert.assertEquals(new Text("token-kind"),
+          token.getDelegationToken().getKind());
+
+      aUrl.renewDelegationToken(authURL, token);
+
+      try {
+        aUrl.renewDelegationToken(nonAuthURL, token);
+        Assert.fail();
+      } catch (Exception ex) {
+        Assert.assertTrue(ex.getMessage().contains("401"));
+      }
+
+      aUrl.getDelegationToken(authURL, token, FOO_USER);
+
+      try {
+        aUrl.renewDelegationToken(authURL2, token);
+        Assert.fail();
+      } catch (Exception ex) {
+        Assert.assertTrue(ex.getMessage().contains("403"));
+      }
+
+      aUrl.getDelegationToken(authURL, token, FOO_USER);
+
+      aUrl.cancelDelegationToken(authURL, token);
+
+      aUrl.getDelegationToken(authURL, token, FOO_USER);
+
+      aUrl.cancelDelegationToken(nonAuthURL, token);
+
+      aUrl.getDelegationToken(authURL, token, FOO_USER);
+
+      try {
+        aUrl.renewDelegationToken(nonAuthURL, token);
+      } catch (Exception ex) {
+        Assert.assertTrue(ex.getMessage().contains("401"));
+      }
+
+    } finally {
+      jetty.stop();
+    }
+  }
+
+  private static class DummyDelegationTokenSecretManager
+      extends AbstractDelegationTokenSecretManager<DelegationTokenIdentifier> {
+
+    public DummyDelegationTokenSecretManager() {
+      super(10000, 10000, 10000, 10000);
+    }
+
+    @Override
+    public DelegationTokenIdentifier createIdentifier() {
+      return new DelegationTokenIdentifier(new Text("fooKind"));
+    }
+
+  }
+
+  @Test
+  public void testExternalDelegationTokenSecretManager() throws Exception {
+    DummyDelegationTokenSecretManager secretMgr
+        = new DummyDelegationTokenSecretManager();
+    final Server jetty = createJettyServer();
+    Context context = new Context();
+    context.setContextPath("/foo");
+    jetty.setHandler(context);
+    context.addFilter(new FilterHolder(AFilter.class), "/*", 0);
+    context.addServlet(new ServletHolder(PingServlet.class), "/bar");
+    try {
+      secretMgr.startThreads();
+      context.setAttribute(DelegationTokenAuthenticationFilter.
+              DELEGATION_TOKEN_SECRET_MANAGER_ATTR, secretMgr);
+      jetty.start();
+      URL authURL = new URL(getJettyURL() + "/foo/bar?authenticated=foo");
+
+      DelegationTokenAuthenticatedURL.Token token =
+          new DelegationTokenAuthenticatedURL.Token();
+      DelegationTokenAuthenticatedURL aUrl =
+          new DelegationTokenAuthenticatedURL();
+
+      aUrl.getDelegationToken(authURL, token, FOO_USER);
+      Assert.assertNotNull(token.getDelegationToken());
+      Assert.assertEquals(new Text("fooKind"),
+          token.getDelegationToken().getKind());
+
+    } finally {
+      jetty.stop();
+      secretMgr.stopThreads();
+    }
+  }
+
+  public static class NoDTFilter extends AuthenticationFilter {
+
+    @Override
+    protected Properties getConfiguration(String configPrefix,
+        FilterConfig filterConfig) {
+      Properties conf = new Properties();
+      conf.setProperty(AUTH_TYPE, PseudoAuthenticationHandler.TYPE);
+      return conf;
+    }
+  }
+
+
+  public static class NoDTHandlerDTAFilter
+      extends DelegationTokenAuthenticationFilter {
+
+    @Override
+    protected Properties getConfiguration(String configPrefix,
+        FilterConfig filterConfig) {
+      Properties conf = new Properties();
+      conf.setProperty(AUTH_TYPE, PseudoAuthenticationHandler.TYPE);
+      return conf;
+    }
+  }
+
+  public static class UserServlet extends HttpServlet {
+
+    @Override
+    protected void doGet(HttpServletRequest req, HttpServletResponse resp)
+        throws ServletException, IOException {
+      resp.setStatus(HttpServletResponse.SC_OK);
+      resp.getWriter().write(req.getUserPrincipal().getName());
+    }
+  }
+
+  @Test
+  public void testDelegationTokenAuthenticationURLWithNoDTFilter()
+    throws Exception {
+    testDelegationTokenAuthenticatedURLWithNoDT(NoDTFilter.class);
+  }
+
+  @Test
+  public void testDelegationTokenAuthenticationURLWithNoDTHandler()
+      throws Exception {
+    testDelegationTokenAuthenticatedURLWithNoDT(NoDTHandlerDTAFilter.class);
+  }
+
+  // we are, also, implicitly testing  KerberosDelegationTokenAuthenticator
+  // fallback here
+  private void testDelegationTokenAuthenticatedURLWithNoDT(
+      Class<? extends Filter> filterClass)  throws Exception {
+    final Server jetty = createJettyServer();
+    Context context = new Context();
+    context.setContextPath("/foo");
+    jetty.setHandler(context);
+    context.addFilter(new FilterHolder(filterClass), "/*", 0);
+    context.addServlet(new ServletHolder(UserServlet.class), "/bar");
+
+    try {
+      jetty.start();
+      final URL url = new URL(getJettyURL() + "/foo/bar");
+
+      UserGroupInformation ugi = UserGroupInformation.createRemoteUser(FOO_USER);
+      ugi.doAs(new PrivilegedExceptionAction<Void>() {
+        @Override
+        public Void run() throws Exception {
+          DelegationTokenAuthenticatedURL.Token token =
+              new DelegationTokenAuthenticatedURL.Token();
+          DelegationTokenAuthenticatedURL aUrl =
+              new DelegationTokenAuthenticatedURL();
+          HttpURLConnection conn = aUrl.openConnection(url, token);
+          Assert.assertEquals(HttpURLConnection.HTTP_OK,
+              conn.getResponseCode());
+          List<String> ret = IOUtils.readLines(conn.getInputStream());
+          Assert.assertEquals(1, ret.size());
+          Assert.assertEquals(FOO_USER, ret.get(0));
+
+          try {
+            aUrl.getDelegationToken(url, token, FOO_USER);
+            Assert.fail();
+          } catch (AuthenticationException ex) {
+            Assert.assertTrue(ex.getMessage().contains(
+                "delegation token operation"));
+          }
+          return null;
+        }
+      });
+    } finally {
+      jetty.stop();
+    }
+  }
+
+  public static class PseudoDTAFilter
+      extends DelegationTokenAuthenticationFilter {
+
+    @Override
+    protected Properties getConfiguration(String configPrefix,
+        FilterConfig filterConfig) {
+      Properties conf = new Properties();
+      conf.setProperty(AUTH_TYPE,
+          PseudoDelegationTokenAuthenticationHandler.class.getName());
+      conf.setProperty(DelegationTokenAuthenticationHandler.TOKEN_KIND,
+          "token-kind");
+      return conf;
+    }
+
+    @Override
+    protected org.apache.hadoop.conf.Configuration getProxyuserConfiguration(
+        FilterConfig filterConfig) throws ServletException {
+      org.apache.hadoop.conf.Configuration conf =
+          new org.apache.hadoop.conf.Configuration(false);
+      conf.set("proxyuser.foo.users", OK_USER);
+      conf.set("proxyuser.foo.hosts", "localhost");
+      return conf;
+    }
+  }
+
+  @Test
+  public void testFallbackToPseudoDelegationTokenAuthenticator()
+      throws Exception {
+    final Server jetty = createJettyServer();
+    Context context = new Context();
+    context.setContextPath("/foo");
+    jetty.setHandler(context);
+    context.addFilter(new FilterHolder(PseudoDTAFilter.class), "/*", 0);
+    context.addServlet(new ServletHolder(UserServlet.class), "/bar");
+
+    try {
+      jetty.start();
+      final URL url = new URL(getJettyURL() + "/foo/bar");
+
+      UserGroupInformation ugi = UserGroupInformation.createRemoteUser(FOO_USER);
+      ugi.doAs(new PrivilegedExceptionAction<Void>() {
+        @Override
+        public Void run() throws Exception {
+          DelegationTokenAuthenticatedURL.Token token =
+              new DelegationTokenAuthenticatedURL.Token();
+          DelegationTokenAuthenticatedURL aUrl =
+              new DelegationTokenAuthenticatedURL();
+          HttpURLConnection conn = aUrl.openConnection(url, token);
+          Assert.assertEquals(HttpURLConnection.HTTP_OK,
+              conn.getResponseCode());
+          List<String> ret = IOUtils.readLines(conn.getInputStream());
+          Assert.assertEquals(1, ret.size());
+          Assert.assertEquals(FOO_USER, ret.get(0));
+
+          aUrl.getDelegationToken(url, token, FOO_USER);
+          Assert.assertNotNull(token.getDelegationToken());
+          Assert.assertEquals(new Text("token-kind"),
+              token.getDelegationToken().getKind());
+          return null;
+        }
+      });
+    } finally {
+      jetty.stop();
+    }
+  }
+
+  public static class KDTAFilter extends DelegationTokenAuthenticationFilter {
+    static String keytabFile;
+
+    @Override
+    protected Properties getConfiguration(String configPrefix,
+        FilterConfig filterConfig) {
+      Properties conf = new Properties();
+      conf.setProperty(AUTH_TYPE,
+          KerberosDelegationTokenAuthenticationHandler.class.getName());
+      conf.setProperty(KerberosAuthenticationHandler.KEYTAB, keytabFile);
+      conf.setProperty(KerberosAuthenticationHandler.PRINCIPAL,
+          "HTTP/localhost");
+      conf.setProperty(KerberosDelegationTokenAuthenticationHandler.TOKEN_KIND,
+          "token-kind");
+      return conf;
+    }
+  }
+
+  private static class KerberosConfiguration extends Configuration {
+    private String principal;
+    private String keytab;
+
+    public KerberosConfiguration(String principal, String keytab) {
+      this.principal = principal;
+      this.keytab = keytab;
+    }
+
+    @Override
+    public AppConfigurationEntry[] getAppConfigurationEntry(String name) {
+      Map<String, String> options = new HashMap<String, String>();
+      options.put("principal", principal);
+      options.put("keyTab", keytab);
+      options.put("useKeyTab", "true");
+      options.put("storeKey", "true");
+      options.put("doNotPrompt", "true");
+      options.put("useTicketCache", "true");
+      options.put("renewTGT", "true");
+      options.put("refreshKrb5Config", "true");
+      options.put("isInitiator", "true");
+      String ticketCache = System.getenv("KRB5CCNAME");
+      if (ticketCache != null) {
+        options.put("ticketCache", ticketCache);
+      }
+      options.put("debug", "true");
+
+      return new AppConfigurationEntry[]{
+          new AppConfigurationEntry(KerberosUtil.getKrb5LoginModuleName(),
+              AppConfigurationEntry.LoginModuleControlFlag.REQUIRED,
+              options),};
+    }
+  }
+
+  public static <T> T doAsKerberosUser(String principal, String keytab,
+      final Callable<T> callable) throws Exception {
+    LoginContext loginContext = null;
+    try {
+      Set<Principal> principals = new HashSet<Principal>();
+      principals.add(new KerberosPrincipal(principal));
+      Subject subject = new Subject(false, principals, new HashSet<Object>(),
+          new HashSet<Object>());
+      loginContext = new LoginContext("", subject, null,
+          new KerberosConfiguration(principal, keytab));
+      loginContext.login();
+      subject = loginContext.getSubject();
+      return Subject.doAs(subject, new PrivilegedExceptionAction<T>() {
+        @Override
+        public T run() throws Exception {
+          return callable.call();
+        }
+      });
+    } catch (PrivilegedActionException ex) {
+      throw ex.getException();
+    } finally {
+      if (loginContext != null) {
+        loginContext.logout();
+      }
+    }
+  }
+
+  @Test
+  public void testKerberosDelegationTokenAuthenticator() throws Exception {
+    // setting hadoop security to kerberos
+    org.apache.hadoop.conf.Configuration conf =
+        new org.apache.hadoop.conf.Configuration();
+    conf.set("hadoop.security.authentication", "kerberos");
+    UserGroupInformation.setConfiguration(conf);
+
+    File testDir = new File("target/" + UUID.randomUUID().toString());
+    Assert.assertTrue(testDir.mkdirs());
+    MiniKdc kdc = new MiniKdc(MiniKdc.createConf(), testDir);
+    final Server jetty = createJettyServer();
+    Context context = new Context();
+    context.setContextPath("/foo");
+    jetty.setHandler(context);
+    context.addFilter(new FilterHolder(KDTAFilter.class), "/*", 0);
+    context.addServlet(new ServletHolder(UserServlet.class), "/bar");
+    try {
+      kdc.start();
+      File keytabFile = new File(testDir, "test.keytab");
+      kdc.createPrincipal(keytabFile, "client", "HTTP/localhost");
+      KDTAFilter.keytabFile = keytabFile.getAbsolutePath();
+      jetty.start();
+
+      final DelegationTokenAuthenticatedURL.Token token =
+          new DelegationTokenAuthenticatedURL.Token();
+      final DelegationTokenAuthenticatedURL aUrl =
+          new DelegationTokenAuthenticatedURL();
+      final URL url = new URL(getJettyURL() + "/foo/bar");
+
+      try {
+        aUrl.getDelegationToken(url, token, FOO_USER);
+        Assert.fail();
+      } catch (AuthenticationException ex) {
+        Assert.assertTrue(ex.getMessage().contains("GSSException"));
+      }
+
+      doAsKerberosUser("client", keytabFile.getAbsolutePath(),
+          new Callable<Void>() {
+            @Override
+            public Void call() throws Exception {
+              aUrl.getDelegationToken(url, token, "client");
+              Assert.assertNotNull(token.getDelegationToken());
+
+              aUrl.renewDelegationToken(url, token);
+              Assert.assertNotNull(token.getDelegationToken());
+
+              aUrl.getDelegationToken(url, token, FOO_USER);
+              Assert.assertNotNull(token.getDelegationToken());
+
+              try {
+                aUrl.renewDelegationToken(url, token);
+                Assert.fail();
+              } catch (Exception ex) {
+                Assert.assertTrue(ex.getMessage().contains("403"));
+              }
+
+              aUrl.getDelegationToken(url, token, FOO_USER);
+
+              aUrl.cancelDelegationToken(url, token);
+              Assert.assertNull(token.getDelegationToken());
+
+              return null;
+            }
+          });
+    } finally {
+      jetty.stop();
+      kdc.stop();
+    }
+  }
+
+  @Test
+  public void testProxyUser() throws Exception {
+    final Server jetty = createJettyServer();
+    Context context = new Context();
+    context.setContextPath("/foo");
+    jetty.setHandler(context);
+    context.addFilter(new FilterHolder(PseudoDTAFilter.class), "/*", 0);
+    context.addServlet(new ServletHolder(UserServlet.class), "/bar");
+
+    try {
+      jetty.start();
+      final URL url = new URL(getJettyURL() + "/foo/bar");
+
+      UserGroupInformation ugi = UserGroupInformation.createRemoteUser(FOO_USER);
+      ugi.doAs(new PrivilegedExceptionAction<Void>() {
+        @Override
+        public Void run() throws Exception {
+          DelegationTokenAuthenticatedURL.Token token =
+              new DelegationTokenAuthenticatedURL.Token();
+          DelegationTokenAuthenticatedURL aUrl =
+              new DelegationTokenAuthenticatedURL();
+
+          // proxyuser using authentication handler authentication
+          HttpURLConnection conn = aUrl.openConnection(url, token, OK_USER);
+          Assert.assertEquals(HttpURLConnection.HTTP_OK,
+              conn.getResponseCode());
+          List<String> ret = IOUtils.readLines(conn.getInputStream());
+          Assert.assertEquals(1, ret.size());
+          Assert.assertEquals(OK_USER, ret.get(0));
+
+          // unauthorized proxy user using authentication handler authentication
+          conn = aUrl.openConnection(url, token, FAIL_USER);
+          Assert.assertEquals(HttpURLConnection.HTTP_FORBIDDEN,
+              conn.getResponseCode());
+
+          // proxy using delegation token authentication
+          aUrl.getDelegationToken(url, token, FOO_USER);
+
+          UserGroupInformation ugi = UserGroupInformation.getCurrentUser();
+          ugi.addToken(token.getDelegationToken());
+          token = new DelegationTokenAuthenticatedURL.Token();
+
+          // requests using delegation token as auth do not honor doAs
+          conn = aUrl.openConnection(url, token, OK_USER);
+          Assert.assertEquals(HttpURLConnection.HTTP_OK,
+              conn.getResponseCode());
+          ret = IOUtils.readLines(conn.getInputStream());
+          Assert.assertEquals(1, ret.size());
+          Assert.assertEquals(FOO_USER, ret.get(0));
+
+          return null;
+        }
+      });
+    } finally {
+      jetty.stop();
+    }
+  }
+
+
+  public static class UGIServlet extends HttpServlet {
+
+    @Override
+    protected void doGet(HttpServletRequest req, HttpServletResponse resp)
+        throws ServletException, IOException {
+      UserGroupInformation ugi = HttpUserGroupInformation.get();
+      if (ugi != null) {
+        String ret = "remoteuser=" + req.getRemoteUser() + ":ugi=" +
+            ugi.getShortUserName();
+        if (ugi.getAuthenticationMethod() ==
+            UserGroupInformation.AuthenticationMethod.PROXY) {
+          ret = "realugi=" + ugi.getRealUser().getShortUserName() + ":" + ret;
+        }
+        resp.setStatus(HttpServletResponse.SC_OK);
+        resp.getWriter().write(ret);
+      } else {
+        resp.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
+      }
+    }
+  }
+
+  @Test
+  public void testHttpUGI() throws Exception {
+    final Server jetty = createJettyServer();
+    Context context = new Context();
+    context.setContextPath("/foo");
+    jetty.setHandler(context);
+    context.addFilter(new FilterHolder(PseudoDTAFilter.class), "/*", 0);
+    context.addServlet(new ServletHolder(UGIServlet.class), "/bar");
+
+    try {
+      jetty.start();
+      final URL url = new URL(getJettyURL() + "/foo/bar");
+
+      UserGroupInformation ugi = UserGroupInformation.createRemoteUser(FOO_USER);
+      ugi.doAs(new PrivilegedExceptionAction<Void>() {
+        @Override
+        public Void run() throws Exception {
+          DelegationTokenAuthenticatedURL.Token token =
+              new DelegationTokenAuthenticatedURL.Token();
+          DelegationTokenAuthenticatedURL aUrl =
+              new DelegationTokenAuthenticatedURL();
+
+          // user foo
+          HttpURLConnection conn = aUrl.openConnection(url, token);
+          Assert.assertEquals(HttpURLConnection.HTTP_OK,
+              conn.getResponseCode());
+          List<String> ret = IOUtils.readLines(conn.getInputStream());
+          Assert.assertEquals(1, ret.size());
+          Assert.assertEquals("remoteuser=" + FOO_USER+ ":ugi=" + FOO_USER, 
+              ret.get(0));
+
+          // user ok-user via proxyuser foo
+          conn = aUrl.openConnection(url, token, OK_USER);
+          Assert.assertEquals(HttpURLConnection.HTTP_OK,
+              conn.getResponseCode());
+          ret = IOUtils.readLines(conn.getInputStream());
+          Assert.assertEquals(1, ret.size());
+          Assert.assertEquals("realugi=" + FOO_USER +":remoteuser=" + OK_USER + 
+                  ":ugi=" + OK_USER, ret.get(0));
+
+          return null;
+        }
+      });
+    } finally {
+      jetty.stop();
+    }
+  }
+
+}

hadoop-common-project/hadoop-kms/src/main/java/org/apache/hadoop/crypto/key/kms/server/KMS.java

@@ -47,7 +47,6 @@ import java.io.IOException;
 import java.net.URI;
 import java.net.URISyntaxException;
 import java.security.Principal;
-import java.text.MessageFormat;
 import java.util.ArrayList;
 import java.util.LinkedList;
 import java.util.List;
@@ -59,18 +58,13 @@ import java.util.Map;
 @Path(KMSRESTConstants.SERVICE_VERSION)
 @InterfaceAudience.Private
 public class KMS {
-  public static final String CREATE_KEY = "CREATE_KEY";
-  public static final String DELETE_KEY = "DELETE_KEY";
-  public static final String ROLL_NEW_VERSION = "ROLL_NEW_VERSION";
-  public static final String GET_KEYS = "GET_KEYS";
-  public static final String GET_KEYS_METADATA = "GET_KEYS_METADATA";
-  public static final String GET_KEY_VERSIONS = "GET_KEY_VERSIONS";
-  public static final String GET_METADATA = "GET_METADATA";
 
-  public static final String GET_KEY_VERSION = "GET_KEY_VERSION";
-  public static final String GET_CURRENT_KEY = "GET_CURRENT_KEY";
-  public static final String GENERATE_EEK = "GENERATE_EEK";
-  public static final String DECRYPT_EEK = "DECRYPT_EEK";
+  public static enum KMSOp {
+    CREATE_KEY, DELETE_KEY, ROLL_NEW_VERSION,
+    GET_KEYS, GET_KEYS_METADATA,
+    GET_KEY_VERSIONS, GET_METADATA, GET_KEY_VERSION, GET_CURRENT_KEY,
+    GENERATE_EEK, DECRYPT_EEK
+  }
 
   private KeyProviderCryptoExtension provider;
   private KMSAudit kmsAudit;
@@ -91,22 +85,22 @@ public class KMS {
 
 
   private static final String UNAUTHORIZED_MSG_WITH_KEY = 
-      "User:{0} not allowed to do ''{1}'' on ''{2}''";
+      "User:%s not allowed to do '%s' on '%s'";
   
   private static final String UNAUTHORIZED_MSG_WITHOUT_KEY = 
-      "User:{0} not allowed to do ''{1}''";
+      "User:%s not allowed to do '%s'";
 
   private void assertAccess(KMSACLs.Type aclType, Principal principal,
-      String operation) throws AccessControlException {
+      KMSOp operation) throws AccessControlException {
     assertAccess(aclType, principal, operation, null);
   }
 
   private void assertAccess(KMSACLs.Type aclType, Principal principal,
-      String operation, String key) throws AccessControlException {
+      KMSOp operation, String key) throws AccessControlException {
     if (!KMSWebApp.getACLs().hasAccess(aclType, principal.getName())) {
       KMSWebApp.getUnauthorizedCallsMeter().mark();
       kmsAudit.unauthorized(principal, operation, key);
-      throw new AuthorizationException(MessageFormat.format(
+      throw new AuthorizationException(String.format(
           (key != null) ? UNAUTHORIZED_MSG_WITH_KEY 
                         : UNAUTHORIZED_MSG_WITHOUT_KEY,
           principal.getName(), operation, key));
@@ -135,7 +129,7 @@ public class KMS {
     Principal user = getPrincipal(securityContext);
     String name = (String) jsonKey.get(KMSRESTConstants.NAME_FIELD);
     KMSClientProvider.checkNotEmpty(name, KMSRESTConstants.NAME_FIELD);
-    assertAccess(KMSACLs.Type.CREATE, user, CREATE_KEY, name);
+    assertAccess(KMSACLs.Type.CREATE, user, KMSOp.CREATE_KEY, name);
     String cipher = (String) jsonKey.get(KMSRESTConstants.CIPHER_FIELD);
     String material = (String) jsonKey.get(KMSRESTConstants.MATERIAL_FIELD);
     int length = (jsonKey.containsKey(KMSRESTConstants.LENGTH_FIELD))
@@ -146,7 +140,7 @@ public class KMS {
         jsonKey.get(KMSRESTConstants.ATTRIBUTES_FIELD);
     if (material != null) {
       assertAccess(KMSACLs.Type.SET_KEY_MATERIAL, user,
-          CREATE_KEY + " with user provided material", name);
+          KMSOp.CREATE_KEY, name);
     }
     KeyProvider.Options options = new KeyProvider.Options(
         KMSWebApp.getConfiguration());
@@ -165,7 +159,7 @@ public class KMS {
 
     provider.flush();
 
-    kmsAudit.ok(user, CREATE_KEY, name, "UserProvidedMaterial:" +
+    kmsAudit.ok(user, KMSOp.CREATE_KEY, name, "UserProvidedMaterial:" +
         (material != null) + " Description:" + description);
 
     if (!KMSWebApp.getACLs().hasAccess(KMSACLs.Type.GET, user.getName())) {
@@ -186,12 +180,12 @@ public class KMS {
       @PathParam("name") String name) throws Exception {
     KMSWebApp.getAdminCallsMeter().mark();
     Principal user = getPrincipal(securityContext);
-    assertAccess(KMSACLs.Type.DELETE, user, DELETE_KEY, name);
+    assertAccess(KMSACLs.Type.DELETE, user, KMSOp.DELETE_KEY, name);
     KMSClientProvider.checkNotEmpty(name, "name");
     provider.deleteKey(name);
     provider.flush();
 
-    kmsAudit.ok(user, DELETE_KEY, name, "");
+    kmsAudit.ok(user, KMSOp.DELETE_KEY, name, "");
 
     return Response.ok().build();
   }
@@ -205,13 +199,13 @@ public class KMS {
       throws Exception {
     KMSWebApp.getAdminCallsMeter().mark();
     Principal user = getPrincipal(securityContext);
-    assertAccess(KMSACLs.Type.ROLLOVER, user, ROLL_NEW_VERSION, name);
+    assertAccess(KMSACLs.Type.ROLLOVER, user, KMSOp.ROLL_NEW_VERSION, name);
     KMSClientProvider.checkNotEmpty(name, "name");
     String material = (String)
         jsonMaterial.get(KMSRESTConstants.MATERIAL_FIELD);
     if (material != null) {
       assertAccess(KMSACLs.Type.SET_KEY_MATERIAL, user,
-          ROLL_NEW_VERSION + " with user provided material", name);
+          KMSOp.ROLL_NEW_VERSION, name);
     }
     KeyProvider.KeyVersion keyVersion = (material != null)
         ? provider.rollNewVersion(name, Base64.decodeBase64(material))
@@ -219,7 +213,7 @@ public class KMS {
 
     provider.flush();
 
-    kmsAudit.ok(user, ROLL_NEW_VERSION, name, "UserProvidedMaterial:" +
+    kmsAudit.ok(user, KMSOp.ROLL_NEW_VERSION, name, "UserProvidedMaterial:" +
         (material != null) + " NewVersion:" + keyVersion.getVersionName());
 
     if (!KMSWebApp.getACLs().hasAccess(KMSACLs.Type.GET, user.getName())) {
@@ -233,15 +227,15 @@ public class KMS {
   @Path(KMSRESTConstants.KEYS_METADATA_RESOURCE)
   @Produces(MediaType.APPLICATION_JSON)
   public Response getKeysMetadata(@Context SecurityContext securityContext,
-      @QueryParam(KMSRESTConstants.KEY_OP) List<String> keyNamesList)
+      @QueryParam(KMSRESTConstants.KEY) List<String> keyNamesList)
       throws Exception {
     KMSWebApp.getAdminCallsMeter().mark();
     Principal user = getPrincipal(securityContext);
     String[] keyNames = keyNamesList.toArray(new String[keyNamesList.size()]);
-    assertAccess(KMSACLs.Type.GET_METADATA, user, GET_KEYS_METADATA);
+    assertAccess(KMSACLs.Type.GET_METADATA, user, KMSOp.GET_KEYS_METADATA);
     KeyProvider.Metadata[] keysMeta = provider.getKeysMetadata(keyNames);
     Object json = KMSServerJSONUtils.toJSON(keyNames, keysMeta);
-    kmsAudit.ok(user, GET_KEYS_METADATA, "");
+    kmsAudit.ok(user, KMSOp.GET_KEYS_METADATA, "");
     return Response.ok().type(MediaType.APPLICATION_JSON).entity(json).build();
   }
 
@@ -252,9 +246,9 @@ public class KMS {
       throws Exception {
     KMSWebApp.getAdminCallsMeter().mark();
     Principal user = getPrincipal(securityContext);
-    assertAccess(KMSACLs.Type.GET_KEYS, user, GET_KEYS);
+    assertAccess(KMSACLs.Type.GET_KEYS, user, KMSOp.GET_KEYS);
     Object json = provider.getKeys();
-    kmsAudit.ok(user, GET_KEYS, "");
+    kmsAudit.ok(user, KMSOp.GET_KEYS, "");
     return Response.ok().type(MediaType.APPLICATION_JSON).entity(json).build();
   }
 
@@ -276,9 +270,9 @@ public class KMS {
     Principal user = getPrincipal(securityContext);
     KMSClientProvider.checkNotEmpty(name, "name");
     KMSWebApp.getAdminCallsMeter().mark();
-    assertAccess(KMSACLs.Type.GET_METADATA, user, GET_METADATA, name);
+    assertAccess(KMSACLs.Type.GET_METADATA, user, KMSOp.GET_METADATA, name);
     Object json = KMSServerJSONUtils.toJSON(name, provider.getMetadata(name));
-    kmsAudit.ok(user, GET_METADATA, name, "");
+    kmsAudit.ok(user, KMSOp.GET_METADATA, name, "");
     return Response.ok().type(MediaType.APPLICATION_JSON).entity(json).build();
   }
 
@@ -292,9 +286,9 @@ public class KMS {
     Principal user = getPrincipal(securityContext);
     KMSClientProvider.checkNotEmpty(name, "name");
     KMSWebApp.getKeyCallsMeter().mark();
-    assertAccess(KMSACLs.Type.GET, user, GET_CURRENT_KEY, name);
+    assertAccess(KMSACLs.Type.GET, user, KMSOp.GET_CURRENT_KEY, name);
     Object json = KMSServerJSONUtils.toJSON(provider.getCurrentKey(name));
-    kmsAudit.ok(user, GET_CURRENT_KEY, name, "");
+    kmsAudit.ok(user, KMSOp.GET_CURRENT_KEY, name, "");
     return Response.ok().type(MediaType.APPLICATION_JSON).entity(json).build();
   }
 
@@ -308,9 +302,9 @@ public class KMS {
     KMSClientProvider.checkNotEmpty(versionName, "versionName");
     KMSWebApp.getKeyCallsMeter().mark();
     KeyVersion keyVersion = provider.getKeyVersion(versionName);
-    assertAccess(KMSACLs.Type.GET, user, GET_KEY_VERSION);
+    assertAccess(KMSACLs.Type.GET, user, KMSOp.GET_KEY_VERSION);
     if (keyVersion != null) {
-      kmsAudit.ok(user, GET_KEY_VERSION, keyVersion.getName(), "");
+      kmsAudit.ok(user, KMSOp.GET_KEY_VERSION, keyVersion.getName(), "");
     }
     Object json = KMSServerJSONUtils.toJSON(keyVersion);
     return Response.ok().type(MediaType.APPLICATION_JSON).entity(json).build();
@@ -334,7 +328,7 @@ public class KMS {
 
     Object retJSON;
     if (edekOp.equals(KMSRESTConstants.EEK_GENERATE)) {
-      assertAccess(KMSACLs.Type.GENERATE_EEK, user, GENERATE_EEK, name);
+      assertAccess(KMSACLs.Type.GENERATE_EEK, user, KMSOp.GENERATE_EEK, name);
 
       List<EncryptedKeyVersion> retEdeks =
           new LinkedList<EncryptedKeyVersion>();
@@ -345,7 +339,7 @@ public class KMS {
       } catch (Exception e) {
         throw new IOException(e);
       }
-      kmsAudit.ok(user, GENERATE_EEK, name, "");
+      kmsAudit.ok(user, KMSOp.GENERATE_EEK, name, "");
       retJSON = new ArrayList();
       for (EncryptedKeyVersion edek : retEdeks) {
         ((ArrayList)retJSON).add(KMSServerJSONUtils.toJSON(edek));
@@ -380,7 +374,7 @@ public class KMS {
         (String) jsonPayload.get(KMSRESTConstants.MATERIAL_FIELD);
     Object retJSON;
     if (eekOp.equals(KMSRESTConstants.EEK_DECRYPT)) {
-      assertAccess(KMSACLs.Type.DECRYPT_EEK, user, DECRYPT_EEK, keyName);
+      assertAccess(KMSACLs.Type.DECRYPT_EEK, user, KMSOp.DECRYPT_EEK, keyName);
       KMSClientProvider.checkNotNull(ivStr, KMSRESTConstants.IV_FIELD);
       byte[] iv = Base64.decodeBase64(ivStr);
       KMSClientProvider.checkNotNull(encMaterialStr,
@@ -391,7 +385,7 @@ public class KMS {
               new KMSClientProvider.KMSEncryptedKeyVersion(keyName, versionName,
                   iv, KeyProviderCryptoExtension.EEK, encMaterial));
       retJSON = KMSServerJSONUtils.toJSON(retKeyVersion);
-      kmsAudit.ok(user, DECRYPT_EEK, keyName, "");
+      kmsAudit.ok(user, KMSOp.DECRYPT_EEK, keyName, "");
     } else {
       throw new IllegalArgumentException("Wrong " + KMSRESTConstants.EEK_OP +
           " value, it must be " + KMSRESTConstants.EEK_GENERATE + " or " +
@@ -412,9 +406,9 @@ public class KMS {
     Principal user = getPrincipal(securityContext);
     KMSClientProvider.checkNotEmpty(name, "name");
     KMSWebApp.getKeyCallsMeter().mark();
-    assertAccess(KMSACLs.Type.GET, user, GET_KEY_VERSIONS, name);
+    assertAccess(KMSACLs.Type.GET, user, KMSOp.GET_KEY_VERSIONS, name);
     Object json = KMSServerJSONUtils.toJSON(provider.getKeyVersions(name));
-    kmsAudit.ok(user, GET_KEY_VERSIONS, name, "");
+    kmsAudit.ok(user, KMSOp.GET_KEY_VERSIONS, name, "");
     return Response.ok().type(MediaType.APPLICATION_JSON).entity(json).build();
   }
 

hadoop-common-project/hadoop-kms/src/main/java/org/apache/hadoop/crypto/key/kms/server/KMSAudit.java

@@ -50,11 +50,11 @@ public class KMSAudit {
     private final AtomicLong accessCount = new AtomicLong(-1);
     private final String keyName;
     private final String user;
-    private final String op;
+    private final KMS.KMSOp op;
     private final String extraMsg;
     private final long startTime = System.currentTimeMillis();
 
-    private AuditEvent(String keyName, String user, String op, String msg) {
+    private AuditEvent(String keyName, String user, KMS.KMSOp op, String msg) {
       this.keyName = keyName;
       this.user = user;
       this.op = op;
@@ -77,7 +77,7 @@ public class KMSAudit {
       return user;
     }
 
-    public String getOp() {
+    public KMS.KMSOp getOp() {
       return op;
     }
 
@@ -90,8 +90,9 @@ public class KMSAudit {
     OK, UNAUTHORIZED, UNAUTHENTICATED, ERROR;
   }
 
-  private static Set<String> AGGREGATE_OPS_WHITELIST = Sets.newHashSet(
-    KMS.GET_KEY_VERSION, KMS.GET_CURRENT_KEY, KMS.DECRYPT_EEK, KMS.GENERATE_EEK
+  private static Set<KMS.KMSOp> AGGREGATE_OPS_WHITELIST = Sets.newHashSet(
+    KMS.KMSOp.GET_KEY_VERSION, KMS.KMSOp.GET_CURRENT_KEY,
+    KMS.KMSOp.DECRYPT_EEK, KMS.KMSOp.GENERATE_EEK
   );
 
   private Cache<String, AuditEvent> cache;
@@ -137,10 +138,10 @@ public class KMSAudit {
         event.getExtraMsg());
   }
 
-  private void op(OpStatus opStatus, final String op, final String user,
+  private void op(OpStatus opStatus, final KMS.KMSOp op, final String user,
       final String key, final String extraMsg) {
     if (!Strings.isNullOrEmpty(user) && !Strings.isNullOrEmpty(key)
-        && !Strings.isNullOrEmpty(op)
+        && (op != null)
         && AGGREGATE_OPS_WHITELIST.contains(op)) {
       String cacheKey = createCacheKey(user, key, op);
       if (opStatus == OpStatus.UNAUTHORIZED) {
@@ -167,7 +168,7 @@ public class KMSAudit {
       }
     } else {
       List<String> kvs = new LinkedList<String>();
-      if (!Strings.isNullOrEmpty(op)) {
+      if (op != null) {
         kvs.add("op=" + op);
       }
       if (!Strings.isNullOrEmpty(key)) {
@@ -185,16 +186,16 @@ public class KMSAudit {
     }
   }
 
-  public void ok(Principal user, String op, String key,
+  public void ok(Principal user, KMS.KMSOp op, String key,
       String extraMsg) {
     op(OpStatus.OK, op, user.getName(), key, extraMsg);
   }
 
-  public void ok(Principal user, String op, String extraMsg) {
+  public void ok(Principal user, KMS.KMSOp op, String extraMsg) {
     op(OpStatus.OK, op, user.getName(), null, extraMsg);
   }
 
-  public void unauthorized(Principal user, String op, String key) {
+  public void unauthorized(Principal user, KMS.KMSOp op, String key) {
     op(OpStatus.UNAUTHORIZED, op, user.getName(), key, "");
   }
 
@@ -211,7 +212,7 @@ public class KMSAudit {
         + " URL:" + url + " ErrorMsg:'" + extraMsg + "'");
   }
 
-  private static String createCacheKey(String user, String key, String op) {
+  private static String createCacheKey(String user, String key, KMS.KMSOp op) {
     return user + "#" + key + "#" + op;
   }
 

hadoop-common-project/hadoop-kms/src/main/java/org/apache/hadoop/crypto/key/kms/server/KMSConfiguration.java

@@ -17,6 +17,7 @@
  */
 package org.apache.hadoop.crypto.key.kms.server;
 
+import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.conf.Configuration;
 
 import java.io.File;
@@ -26,6 +27,7 @@ import java.net.URL;
 /**
  * Utility class to load KMS configuration files.
  */
+@InterfaceAudience.Private
 public class KMSConfiguration {
 
   public static final String KMS_CONFIG_DIR = "kms.config.dir";

hadoop-common-project/hadoop-kms/src/main/java/org/apache/hadoop/crypto/key/kms/server/KMSJMXServlet.java

@@ -17,12 +17,15 @@
  */
 package org.apache.hadoop.crypto.key.kms.server;
 
+import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.jmx.JMXJsonServlet;
 
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
+
 import java.io.IOException;
 
+@InterfaceAudience.Private
 public class KMSJMXServlet extends JMXJsonServlet {
 
   @Override

hadoop-common-project/hadoop-kms/src/test/java/org/apache/hadoop/crypto/key/kms/server/TestKMSAudit.java

@@ -23,6 +23,7 @@ import java.io.OutputStream;
 import java.io.PrintStream;
 import java.security.Principal;
 
+import org.apache.hadoop.crypto.key.kms.server.KMS.KMSOp;
 import org.apache.log4j.LogManager;
 import org.apache.log4j.PropertyConfigurator;
 import org.junit.After;
@@ -82,16 +83,16 @@ public class TestKMSAudit {
   public void testAggregation() throws Exception {
     Principal luser = Mockito.mock(Principal.class);
     Mockito.when(luser.getName()).thenReturn("luser");
-    kmsAudit.ok(luser, KMS.DECRYPT_EEK, "k1", "testmsg");
-    kmsAudit.ok(luser, KMS.DECRYPT_EEK, "k1", "testmsg");
-    kmsAudit.ok(luser, KMS.DECRYPT_EEK, "k1", "testmsg");
-    kmsAudit.ok(luser, KMS.DELETE_KEY, "k1", "testmsg");
-    kmsAudit.ok(luser, KMS.ROLL_NEW_VERSION, "k1", "testmsg");
-    kmsAudit.ok(luser, KMS.DECRYPT_EEK, "k1", "testmsg");
-    kmsAudit.ok(luser, KMS.DECRYPT_EEK, "k1", "testmsg");
-    kmsAudit.ok(luser, KMS.DECRYPT_EEK, "k1", "testmsg");
+    kmsAudit.ok(luser, KMSOp.DECRYPT_EEK, "k1", "testmsg");
+    kmsAudit.ok(luser, KMSOp.DECRYPT_EEK, "k1", "testmsg");
+    kmsAudit.ok(luser, KMSOp.DECRYPT_EEK, "k1", "testmsg");
+    kmsAudit.ok(luser, KMSOp.DELETE_KEY, "k1", "testmsg");
+    kmsAudit.ok(luser, KMSOp.ROLL_NEW_VERSION, "k1", "testmsg");
+    kmsAudit.ok(luser, KMSOp.DECRYPT_EEK, "k1", "testmsg");
+    kmsAudit.ok(luser, KMSOp.DECRYPT_EEK, "k1", "testmsg");
+    kmsAudit.ok(luser, KMSOp.DECRYPT_EEK, "k1", "testmsg");
     Thread.sleep(1500);
-    kmsAudit.ok(luser, KMS.DECRYPT_EEK, "k1", "testmsg");
+    kmsAudit.ok(luser, KMSOp.DECRYPT_EEK, "k1", "testmsg");
     Thread.sleep(1500);
     String out = getAndResetLogOutput();
     System.out.println(out);
@@ -110,15 +111,15 @@ public class TestKMSAudit {
   public void testAggregationUnauth() throws Exception {
     Principal luser = Mockito.mock(Principal.class);
     Mockito.when(luser.getName()).thenReturn("luser");
-    kmsAudit.unauthorized(luser, KMS.GENERATE_EEK, "k2");
+    kmsAudit.unauthorized(luser, KMSOp.GENERATE_EEK, "k2");
     Thread.sleep(1000);
-    kmsAudit.ok(luser, KMS.GENERATE_EEK, "k3", "testmsg");
-    kmsAudit.ok(luser, KMS.GENERATE_EEK, "k3", "testmsg");
-    kmsAudit.ok(luser, KMS.GENERATE_EEK, "k3", "testmsg");
-    kmsAudit.ok(luser, KMS.GENERATE_EEK, "k3", "testmsg");
-    kmsAudit.ok(luser, KMS.GENERATE_EEK, "k3", "testmsg");
-    kmsAudit.unauthorized(luser, KMS.GENERATE_EEK, "k3");
-    kmsAudit.ok(luser, KMS.GENERATE_EEK, "k3", "testmsg");
+    kmsAudit.ok(luser, KMSOp.GENERATE_EEK, "k3", "testmsg");
+    kmsAudit.ok(luser, KMSOp.GENERATE_EEK, "k3", "testmsg");
+    kmsAudit.ok(luser, KMSOp.GENERATE_EEK, "k3", "testmsg");
+    kmsAudit.ok(luser, KMSOp.GENERATE_EEK, "k3", "testmsg");
+    kmsAudit.ok(luser, KMSOp.GENERATE_EEK, "k3", "testmsg");
+    kmsAudit.unauthorized(luser, KMSOp.GENERATE_EEK, "k3");
+    kmsAudit.ok(luser, KMSOp.GENERATE_EEK, "k3", "testmsg");
     Thread.sleep(2000);
     String out = getAndResetLogOutput();
     System.out.println(out);

hadoop-hdfs-project/hadoop-hdfs-httpfs/src/main/java/org/apache/hadoop/fs/http/client/HttpFSFileSystem.java

@@ -39,12 +39,14 @@ import org.apache.hadoop.fs.permission.AclStatus;
 import org.apache.hadoop.fs.permission.FsPermission;
 import org.apache.hadoop.hdfs.DFSConfigKeys;
 import org.apache.hadoop.lib.wsrs.EnumSetParam;
-import org.apache.hadoop.net.NetUtils;
 import org.apache.hadoop.security.UserGroupInformation;
-import org.apache.hadoop.security.authentication.client.AuthenticatedURL;
-import org.apache.hadoop.security.authentication.client.Authenticator;
+import org.apache.hadoop.security.authentication.client.AuthenticationException;
 import org.apache.hadoop.security.token.Token;
 import org.apache.hadoop.security.token.TokenIdentifier;
+import org.apache.hadoop.security.token.delegation.AbstractDelegationTokenIdentifier;
+import org.apache.hadoop.security.token.delegation.web.DelegationTokenAuthenticatedURL;
+import org.apache.hadoop.security.token.delegation.web.DelegationTokenAuthenticator;
+import org.apache.hadoop.security.token.delegation.web.KerberosDelegationTokenAuthenticator;
 import org.apache.hadoop.util.Progressable;
 import org.apache.hadoop.util.ReflectionUtils;
 import org.apache.hadoop.util.StringUtils;
@@ -67,7 +69,6 @@ import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
 import java.net.HttpURLConnection;
-import java.net.InetSocketAddress;
 import java.net.URI;
 import java.net.URISyntaxException;
 import java.net.URL;
@@ -75,7 +76,6 @@ import java.security.PrivilegedExceptionAction;
 import java.text.MessageFormat;
 import java.util.HashMap;
 import java.util.Map;
-import java.util.concurrent.Callable;
 
 /**
  * HttpFSServer implementation of the FileSystemAccess FileSystem.
@@ -217,34 +217,15 @@ public class HttpFSFileSystem extends FileSystem
 
   }
 
-
-  private AuthenticatedURL.Token authToken = new AuthenticatedURL.Token();
+  private DelegationTokenAuthenticatedURL authURL;
+  private DelegationTokenAuthenticatedURL.Token authToken =
+      new DelegationTokenAuthenticatedURL.Token();
   private URI uri;
-  private InetSocketAddress httpFSAddr;
   private Path workingDir;
   private UserGroupInformation realUser;
   private String doAs;
-  private Token<?> delegationToken;
 
-  //This method enables handling UGI doAs with SPNEGO, we have to
-  //fallback to the realuser who logged in with Kerberos credentials
-  private <T> T doAsRealUserIfNecessary(final Callable<T> callable)
-    throws IOException {
-    try {
-      if (realUser.getShortUserName().equals(doAs)) {
-        return callable.call();
-      } else {
-        return realUser.doAs(new PrivilegedExceptionAction<T>() {
-          @Override
-          public T run() throws Exception {
-            return callable.call();
-          }
-        });
-      }
-    } catch (Exception ex) {
-      throw new IOException(ex.toString(), ex);
-    }
-  }
+
 
   /**
    * Convenience method that creates a <code>HttpURLConnection</code> for the
@@ -291,20 +272,26 @@ public class HttpFSFileSystem extends FileSystem
   private HttpURLConnection getConnection(final String method,
       Map<String, String> params, Map<String, List<String>> multiValuedParams,
       Path path, boolean makeQualified) throws IOException {
-    if (!realUser.getShortUserName().equals(doAs)) {
-      params.put(DO_AS_PARAM, doAs);
-    }
-    HttpFSKerberosAuthenticator.injectDelegationToken(params, delegationToken);
     if (makeQualified) {
       path = makeQualified(path);
     }
     final URL url = HttpFSUtils.createURL(path, params, multiValuedParams);
-    return doAsRealUserIfNecessary(new Callable<HttpURLConnection>() {
-      @Override
-      public HttpURLConnection call() throws Exception {
-        return getConnection(url, method);
+    try {
+      return UserGroupInformation.getCurrentUser().doAs(
+          new PrivilegedExceptionAction<HttpURLConnection>() {
+            @Override
+            public HttpURLConnection run() throws Exception {
+              return getConnection(url, method);
+            }
+          }
+      );
+    } catch (Exception ex) {
+      if (ex instanceof IOException) {
+        throw (IOException) ex;
+      } else {
+        throw new IOException(ex);
       }
-    });
+    }
   }
 
   /**
@@ -321,12 +308,8 @@ public class HttpFSFileSystem extends FileSystem
    * @throws IOException thrown if an IO error occurrs.
    */
   private HttpURLConnection getConnection(URL url, String method) throws IOException {
-    Class<? extends Authenticator> klass =
-      getConf().getClass("httpfs.authenticator.class",
-                         HttpFSKerberosAuthenticator.class, Authenticator.class);
-    Authenticator authenticator = ReflectionUtils.newInstance(klass, getConf());
     try {
-      HttpURLConnection conn = new AuthenticatedURL(authenticator).openConnection(url, authToken);
+      HttpURLConnection conn = authURL.openConnection(url, authToken);
       conn.setRequestMethod(method);
       if (method.equals(HTTP_POST) || method.equals(HTTP_PUT)) {
         conn.setDoOutput(true);
@@ -357,10 +340,17 @@ public class HttpFSFileSystem extends FileSystem
     super.initialize(name, conf);
     try {
       uri = new URI(name.getScheme() + "://" + name.getAuthority());
-      httpFSAddr = NetUtils.createSocketAddr(getCanonicalUri().toString());
     } catch (URISyntaxException ex) {
       throw new IOException(ex);
     }
+
+    Class<? extends DelegationTokenAuthenticator> klass =
+        getConf().getClass("httpfs.authenticator.class",
+            KerberosDelegationTokenAuthenticator.class,
+            DelegationTokenAuthenticator.class);
+    DelegationTokenAuthenticator authenticator =
+        ReflectionUtils.newInstance(klass, getConf());
+    authURL = new DelegationTokenAuthenticatedURL(authenticator);
   }
 
   @Override
@@ -1059,38 +1049,57 @@ public class HttpFSFileSystem extends FileSystem
   @Override
   public Token<?> getDelegationToken(final String renewer)
     throws IOException {
-    return doAsRealUserIfNecessary(new Callable<Token<?>>() {
-      @Override
-      public Token<?> call() throws Exception {
-        return HttpFSKerberosAuthenticator.
-          getDelegationToken(uri, httpFSAddr, authToken, renewer);
+    try {
+      return UserGroupInformation.getCurrentUser().doAs(
+          new PrivilegedExceptionAction<Token<?>>() {
+            @Override
+            public Token<?> run() throws Exception {
+              return authURL.getDelegationToken(uri.toURL(), authToken,
+                  renewer);
+            }
+          }
+      );
+    } catch (Exception ex) {
+      if (ex instanceof IOException) {
+        throw (IOException) ex;
+      } else {
+        throw new IOException(ex);
       }
-    });
+    }
   }
 
   public long renewDelegationToken(final Token<?> token) throws IOException {
-    return doAsRealUserIfNecessary(new Callable<Long>() {
-      @Override
-      public Long call() throws Exception {
-        return HttpFSKerberosAuthenticator.
-          renewDelegationToken(uri,  authToken, token);
+    try {
+      return UserGroupInformation.getCurrentUser().doAs(
+          new PrivilegedExceptionAction<Long>() {
+            @Override
+            public Long run() throws Exception {
+              return authURL.renewDelegationToken(uri.toURL(), authToken);
+            }
+          }
+      );
+    } catch (Exception ex) {
+      if (ex instanceof IOException) {
+        throw (IOException) ex;
+      } else {
+        throw new IOException(ex);
       }
-    });
+    }
   }
 
   public void cancelDelegationToken(final Token<?> token) throws IOException {
-    HttpFSKerberosAuthenticator.
-      cancelDelegationToken(uri, authToken, token);
+    authURL.cancelDelegationToken(uri.toURL(), authToken);
   }
 
   @Override
   public Token<?> getRenewToken() {
-    return delegationToken;
+    return null; //TODO : for renewer
   }
 
   @Override
+  @SuppressWarnings("unchecked")
   public <T extends TokenIdentifier> void setDelegationToken(Token<T> token) {
-    delegationToken = token;
+    //TODO : for renewer
   }
 
   @Override

hadoop-hdfs-project/hadoop-hdfs-httpfs/src/main/java/org/apache/hadoop/fs/http/client/HttpFSKerberosAuthenticator.java

@@ -1,188 +0,0 @@
-/**
- * Licensed to the Apache Software Foundation (ASF) under one
- * or more contributor license agreements.  See the NOTICE file
- * distributed with this work for additional information
- * regarding copyright ownership.  The ASF licenses this file
- * to you under the Apache License, Version 2.0 (the
- * "License"); you may not use this file except in compliance
- * with the License.  You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package org.apache.hadoop.fs.http.client;
-
-
-import org.apache.hadoop.classification.InterfaceAudience;
-import org.apache.hadoop.fs.Path;
-import org.apache.hadoop.security.SecurityUtil;
-import org.apache.hadoop.security.authentication.client.AuthenticatedURL;
-import org.apache.hadoop.security.authentication.client.AuthenticationException;
-import org.apache.hadoop.security.authentication.client.Authenticator;
-import org.apache.hadoop.security.authentication.client.KerberosAuthenticator;
-import org.apache.hadoop.security.token.Token;
-import org.apache.hadoop.security.token.delegation.AbstractDelegationTokenIdentifier;
-import org.json.simple.JSONObject;
-
-import java.io.IOException;
-import java.net.HttpURLConnection;
-import java.net.InetSocketAddress;
-import java.net.URI;
-import java.net.URL;
-import java.util.HashMap;
-import java.util.Map;
-
-/**
- * A <code>KerberosAuthenticator</code> subclass that fallback to
- * {@link HttpFSPseudoAuthenticator}.
- */
-@InterfaceAudience.Private
-public class HttpFSKerberosAuthenticator extends KerberosAuthenticator {
-
-  /**
-   * Returns the fallback authenticator if the server does not use
-   * Kerberos SPNEGO HTTP authentication.
-   *
-   * @return a {@link HttpFSPseudoAuthenticator} instance.
-   */
-  @Override
-  protected Authenticator getFallBackAuthenticator() {
-    return new HttpFSPseudoAuthenticator();
-  }
-
-  private static final String HTTP_GET = "GET";
-  private static final String HTTP_PUT = "PUT";
-
-  public static final String DELEGATION_PARAM = "delegation";
-  public static final String TOKEN_PARAM = "token";
-  public static final String RENEWER_PARAM = "renewer";
-  public static final String DELEGATION_TOKEN_JSON = "Token";
-  public static final String DELEGATION_TOKEN_URL_STRING_JSON = "urlString";
-  public static final String RENEW_DELEGATION_TOKEN_JSON = "long";
-
-  /**
-   * DelegationToken operations.
-   */
-  @InterfaceAudience.Private
-  public static enum DelegationTokenOperation {
-    GETDELEGATIONTOKEN(HTTP_GET, true),
-    RENEWDELEGATIONTOKEN(HTTP_PUT, true),
-    CANCELDELEGATIONTOKEN(HTTP_PUT, false);
-
-    private String httpMethod;
-    private boolean requiresKerberosCredentials;
-
-    private DelegationTokenOperation(String httpMethod,
-                                     boolean requiresKerberosCredentials) {
-      this.httpMethod = httpMethod;
-      this.requiresKerberosCredentials = requiresKerberosCredentials;
-    }
-
-    public String getHttpMethod() {
-      return httpMethod;
-    }
-
-    public boolean requiresKerberosCredentials() {
-      return requiresKerberosCredentials;
-    }
-
-  }
-
-  public static void injectDelegationToken(Map<String, String> params,
-                                          Token<?> dtToken)
-    throws IOException {
-    if (dtToken != null) {
-      params.put(DELEGATION_PARAM, dtToken.encodeToUrlString());
-    }
-  }
-
-  private boolean hasDelegationToken(URL url) {
-    return url.getQuery().contains(DELEGATION_PARAM + "=");
-  }
-
-  @Override
-  public void authenticate(URL url, AuthenticatedURL.Token token)
-    throws IOException, AuthenticationException {
-    if (!hasDelegationToken(url)) {
-      super.authenticate(url, token);
-    }
-  }
-
-  public static final String OP_PARAM = "op";
-
-  public static Token<?> getDelegationToken(URI fsURI,
-    InetSocketAddress httpFSAddr, AuthenticatedURL.Token token,
-    String renewer) throws IOException {
-    DelegationTokenOperation op = 
-      DelegationTokenOperation.GETDELEGATIONTOKEN;
-    Map<String, String> params = new HashMap<String, String>();
-    params.put(OP_PARAM, op.toString());
-    params.put(RENEWER_PARAM,renewer);
-    URL url = HttpFSUtils.createURL(new Path(fsURI), params);
-    AuthenticatedURL aUrl =
-      new AuthenticatedURL(new HttpFSKerberosAuthenticator());
-    try {
-      HttpURLConnection conn = aUrl.openConnection(url, token);
-      conn.setRequestMethod(op.getHttpMethod());
-      HttpFSUtils.validateResponse(conn, HttpURLConnection.HTTP_OK);
-      JSONObject json = (JSONObject) ((JSONObject)
-        HttpFSUtils.jsonParse(conn)).get(DELEGATION_TOKEN_JSON);
-      String tokenStr = (String)
-        json.get(DELEGATION_TOKEN_URL_STRING_JSON);
-      Token<AbstractDelegationTokenIdentifier> dToken =
-        new Token<AbstractDelegationTokenIdentifier>();
-      dToken.decodeFromUrlString(tokenStr);
-      SecurityUtil.setTokenService(dToken, httpFSAddr);
-      return dToken;
-    } catch (AuthenticationException ex) {
-      throw new IOException(ex.toString(), ex);
-    }
-  }
-
-  public static long renewDelegationToken(URI fsURI,
-    AuthenticatedURL.Token token, Token<?> dToken) throws IOException {
-    Map<String, String> params = new HashMap<String, String>();
-    params.put(OP_PARAM,
-               DelegationTokenOperation.RENEWDELEGATIONTOKEN.toString());
-    params.put(TOKEN_PARAM, dToken.encodeToUrlString());
-    URL url = HttpFSUtils.createURL(new Path(fsURI), params);
-    AuthenticatedURL aUrl =
-      new AuthenticatedURL(new HttpFSKerberosAuthenticator());
-    try {
-      HttpURLConnection conn = aUrl.openConnection(url, token);
-      conn.setRequestMethod(
-        DelegationTokenOperation.RENEWDELEGATIONTOKEN.getHttpMethod());
-      HttpFSUtils.validateResponse(conn, HttpURLConnection.HTTP_OK);
-      JSONObject json = (JSONObject) ((JSONObject)
-        HttpFSUtils.jsonParse(conn)).get(DELEGATION_TOKEN_JSON);
-      return (Long)(json.get(RENEW_DELEGATION_TOKEN_JSON));
-    } catch (AuthenticationException ex) {
-      throw new IOException(ex.toString(), ex);
-    }
-  }
-
-  public static void cancelDelegationToken(URI fsURI,
-    AuthenticatedURL.Token token, Token<?> dToken) throws IOException {
-    Map<String, String> params = new HashMap<String, String>();
-    params.put(OP_PARAM,
-               DelegationTokenOperation.CANCELDELEGATIONTOKEN.toString());
-    params.put(TOKEN_PARAM, dToken.encodeToUrlString());
-    URL url = HttpFSUtils.createURL(new Path(fsURI), params);
-    AuthenticatedURL aUrl =
-      new AuthenticatedURL(new HttpFSKerberosAuthenticator());
-    try {
-      HttpURLConnection conn = aUrl.openConnection(url, token);
-      conn.setRequestMethod(
-        DelegationTokenOperation.CANCELDELEGATIONTOKEN.getHttpMethod());
-      HttpFSUtils.validateResponse(conn, HttpURLConnection.HTTP_OK);
-    } catch (AuthenticationException ex) {
-      throw new IOException(ex.toString(), ex);
-    }
-  }
-
-}

hadoop-hdfs-project/hadoop-hdfs-httpfs/src/main/java/org/apache/hadoop/fs/http/server/HttpFSAuthenticationFilter.java

@@ -20,7 +20,10 @@ package org.apache.hadoop.fs.http.server;
 import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.security.authentication.server.AuthenticationFilter;
+import org.apache.hadoop.security.token.delegation.web.DelegationTokenAuthenticationFilter;
+
 import javax.servlet.FilterConfig;
+import javax.servlet.ServletException;
 import java.io.FileReader;
 import java.io.IOException;
 import java.io.Reader;
@@ -32,7 +35,9 @@ import java.util.Properties;
  * from HttpFSServer's server configuration.
  */
 @InterfaceAudience.Private
-public class HttpFSAuthenticationFilter extends AuthenticationFilter {
+public class HttpFSAuthenticationFilter
+    extends DelegationTokenAuthenticationFilter {
+
   private static final String CONF_PREFIX = "httpfs.authentication.";
 
   private static final String SIGNATURE_SECRET_FILE = SIGNATURE_SECRET + ".file";
@@ -50,7 +55,8 @@ public class HttpFSAuthenticationFilter extends AuthenticationFilter {
    * @return hadoop-auth configuration read from HttpFSServer's configuration.
    */
   @Override
-  protected Properties getConfiguration(String configPrefix, FilterConfig filterConfig) {
+  protected Properties getConfiguration(String configPrefix,
+      FilterConfig filterConfig) throws ServletException{
     Properties props = new Properties();
     Configuration conf = HttpFSServerWebApp.get().getConfig();
 
@@ -64,11 +70,6 @@ public class HttpFSAuthenticationFilter extends AuthenticationFilter {
       }
     }
 
-    if (props.getProperty(AUTH_TYPE).equals("kerberos")) {
-      props.setProperty(AUTH_TYPE,
-                        HttpFSKerberosAuthenticationHandler.class.getName());
-    }
-
     String signatureSecretFile = props.getProperty(SIGNATURE_SECRET_FILE, null);
     if (signatureSecretFile == null) {
       throw new RuntimeException("Undefined property: " + SIGNATURE_SECRET_FILE);

hadoop-hdfs-project/hadoop-hdfs-httpfs/src/main/java/org/apache/hadoop/fs/http/server/HttpFSKerberosAuthenticationHandler.java

@@ -1,230 +0,0 @@
-/**
- * Licensed to the Apache Software Foundation (ASF) under one
- * or more contributor license agreements.  See the NOTICE file
- * distributed with this work for additional information
- * regarding copyright ownership.  The ASF licenses this file
- * to you under the Apache License, Version 2.0 (the
- * "License"); you may not use this file except in compliance
- * with the License.  You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package org.apache.hadoop.fs.http.server;
-
-import org.apache.hadoop.classification.InterfaceAudience;
-import org.apache.hadoop.fs.http.client.HttpFSFileSystem;
-import org.apache.hadoop.fs.http.client.HttpFSKerberosAuthenticator;
-import org.apache.hadoop.fs.http.client.HttpFSKerberosAuthenticator.DelegationTokenOperation;
-import org.apache.hadoop.lib.service.DelegationTokenIdentifier;
-import org.apache.hadoop.lib.service.DelegationTokenManager;
-import org.apache.hadoop.lib.service.DelegationTokenManagerException;
-import org.apache.hadoop.security.UserGroupInformation;
-import org.apache.hadoop.security.authentication.client.AuthenticationException;
-import org.apache.hadoop.security.authentication.server.AuthenticationToken;
-import org.apache.hadoop.security.authentication.server.KerberosAuthenticationHandler;
-import org.apache.hadoop.security.token.Token;
-import org.json.simple.JSONObject;
-
-import javax.servlet.http.HttpServletRequest;
-import javax.servlet.http.HttpServletResponse;
-import javax.ws.rs.core.MediaType;
-import java.io.IOException;
-import java.io.Writer;
-import java.text.MessageFormat;
-import java.util.HashMap;
-import java.util.HashSet;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.Set;
-
-/**
- * Server side <code>AuthenticationHandler</code> that authenticates requests
- * using the incoming delegation token as a 'delegation' query string parameter.
- * <p/>
- * If not delegation token is present in the request it delegates to the
- * {@link KerberosAuthenticationHandler}
- */
-@InterfaceAudience.Private
-public class HttpFSKerberosAuthenticationHandler
-  extends KerberosAuthenticationHandler {
-
-  static final Set<String> DELEGATION_TOKEN_OPS =
-    new HashSet<String>();
-
-  static {
-    DELEGATION_TOKEN_OPS.add(
-      DelegationTokenOperation.GETDELEGATIONTOKEN.toString());
-    DELEGATION_TOKEN_OPS.add(
-      DelegationTokenOperation.RENEWDELEGATIONTOKEN.toString());
-    DELEGATION_TOKEN_OPS.add(
-      DelegationTokenOperation.CANCELDELEGATIONTOKEN.toString());
-  }
-
-  public static final String TYPE = "kerberos-dt";
-
-  /**
-   * Returns authentication type of the handler.
-   *
-   * @return <code>delegationtoken-kerberos</code>
-   */
-  @Override
-  public String getType() {
-    return TYPE;
-  }
-
-  private static final String ENTER = System.getProperty("line.separator");
-
-  @Override
-  @SuppressWarnings("unchecked")
-  public boolean managementOperation(AuthenticationToken token,
-      HttpServletRequest request, HttpServletResponse response)
-    throws IOException, AuthenticationException {
-    boolean requestContinues = true;
-    String op = request.getParameter(HttpFSFileSystem.OP_PARAM);
-    op = (op != null) ? op.toUpperCase() : null;
-    if (DELEGATION_TOKEN_OPS.contains(op) &&
-        !request.getMethod().equals("OPTIONS")) {
-      DelegationTokenOperation dtOp =
-        DelegationTokenOperation.valueOf(op);
-      if (dtOp.getHttpMethod().equals(request.getMethod())) {
-        if (dtOp.requiresKerberosCredentials() && token == null) {
-          response.sendError(HttpServletResponse.SC_UNAUTHORIZED,
-            MessageFormat.format(
-              "Operation [{0}] requires SPNEGO authentication established",
-              dtOp));
-          requestContinues = false;
-        } else {
-          DelegationTokenManager tokenManager =
-            HttpFSServerWebApp.get().get(DelegationTokenManager.class);
-          try {
-            Map map = null;
-            switch (dtOp) {
-              case GETDELEGATIONTOKEN:
-                String renewerParam =
-                  request.getParameter(HttpFSKerberosAuthenticator.RENEWER_PARAM);
-                if (renewerParam == null) {
-                  renewerParam = token.getUserName();
-                }
-                Token<?> dToken = tokenManager.createToken(
-                  UserGroupInformation.getCurrentUser(), renewerParam);
-                map = delegationTokenToJSON(dToken);
-                break;
-              case RENEWDELEGATIONTOKEN:
-              case CANCELDELEGATIONTOKEN:
-                String tokenParam =
-                  request.getParameter(HttpFSKerberosAuthenticator.TOKEN_PARAM);
-                if (tokenParam == null) {
-                  response.sendError(HttpServletResponse.SC_BAD_REQUEST,
-                    MessageFormat.format(
-                      "Operation [{0}] requires the parameter [{1}]",
-                      dtOp, HttpFSKerberosAuthenticator.TOKEN_PARAM));
-                  requestContinues = false;
-                } else {
-                  if (dtOp == DelegationTokenOperation.CANCELDELEGATIONTOKEN) {
-                    Token<DelegationTokenIdentifier> dt =
-                      new Token<DelegationTokenIdentifier>();
-                    dt.decodeFromUrlString(tokenParam);
-                    tokenManager.cancelToken(dt,
-                      UserGroupInformation.getCurrentUser().getUserName());
-                  } else {
-                    Token<DelegationTokenIdentifier> dt =
-                      new Token<DelegationTokenIdentifier>();
-                    dt.decodeFromUrlString(tokenParam);
-                    long expirationTime =
-                      tokenManager.renewToken(dt, token.getUserName());
-                    map = new HashMap();
-                    map.put("long", expirationTime);
-                  }
-                }
-                break;
-            }
-            if (requestContinues) {
-              response.setStatus(HttpServletResponse.SC_OK);
-              if (map != null) {
-                response.setContentType(MediaType.APPLICATION_JSON);
-                Writer writer = response.getWriter();
-                JSONObject.writeJSONString(map, writer);
-                writer.write(ENTER);
-                writer.flush();
-
-              }
-              requestContinues = false;
-            }
-          } catch (DelegationTokenManagerException ex) {
-            throw new AuthenticationException(ex.toString(), ex);
-          }
-        }
-      } else {
-        response.sendError(HttpServletResponse.SC_BAD_REQUEST,
-          MessageFormat.format(
-            "Wrong HTTP method [{0}] for operation [{1}], it should be [{2}]",
-            request.getMethod(), dtOp, dtOp.getHttpMethod()));
-        requestContinues = false;
-      }
-    }
-    return requestContinues;
-  }
-
-  @SuppressWarnings("unchecked")
-  private static Map delegationTokenToJSON(Token token) throws IOException {
-    Map json = new LinkedHashMap();
-    json.put(HttpFSKerberosAuthenticator.DELEGATION_TOKEN_URL_STRING_JSON,
-             token.encodeToUrlString());
-    Map response = new LinkedHashMap();
-    response.put(HttpFSKerberosAuthenticator.DELEGATION_TOKEN_JSON, json);
-    return response;
-  }
-  
-  /**
-   * Authenticates a request looking for the <code>delegation</code>
-   * query-string parameter and verifying it is a valid token. If there is not
-   * <code>delegation</code> query-string parameter, it delegates the
-   * authentication to the {@link KerberosAuthenticationHandler} unless it is
-   * disabled.
-   *
-   * @param request the HTTP client request.
-   * @param response the HTTP client response.
-   *
-   * @return the authentication token for the authenticated request.
-   * @throws IOException thrown if an IO error occurred.
-   * @throws AuthenticationException thrown if the authentication failed.
-   */
-  @Override
-  public AuthenticationToken authenticate(HttpServletRequest request,
-                                          HttpServletResponse response)
-    throws IOException, AuthenticationException {
-    AuthenticationToken token;
-    String delegationParam =
-      request.getParameter(HttpFSKerberosAuthenticator.DELEGATION_PARAM);
-    if (delegationParam != null) {
-      try {
-        Token<DelegationTokenIdentifier> dt =
-          new Token<DelegationTokenIdentifier>();
-        dt.decodeFromUrlString(delegationParam);
-        DelegationTokenManager tokenManager =
-          HttpFSServerWebApp.get().get(DelegationTokenManager.class);
-        UserGroupInformation ugi = tokenManager.verifyToken(dt);
-        final String shortName = ugi.getShortUserName();
-
-        // creating a ephemeral token
-        token = new AuthenticationToken(shortName, ugi.getUserName(),
-                                        getType());
-        token.setExpires(0);
-      } catch (Throwable ex) {
-        throw new AuthenticationException("Could not verify DelegationToken, " +
-                                          ex.toString(), ex);
-      }
-    } else {
-      token = super.authenticate(request, response);
-    }
-    return token;
-  }
-
-
-}

hadoop-hdfs-project/hadoop-hdfs-httpfs/src/main/java/org/apache/hadoop/lib/service/DelegationTokenManager.java

@@ -1,78 +0,0 @@
-/**
- * Licensed to the Apache Software Foundation (ASF) under one
- * or more contributor license agreements.  See the NOTICE file
- * distributed with this work for additional information
- * regarding copyright ownership.  The ASF licenses this file
- * to you under the Apache License, Version 2.0 (the
- * "License"); you may not use this file except in compliance
- * with the License.  You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package org.apache.hadoop.lib.service;
-
-import org.apache.hadoop.classification.InterfaceAudience;
-import org.apache.hadoop.security.UserGroupInformation;
-import org.apache.hadoop.security.token.Token;
-
-/**
- * Service interface to manage HttpFS delegation tokens.
- */
-@InterfaceAudience.Private
-public interface DelegationTokenManager {
-
-  /**
-   * Creates a delegation token.
-   *
-   * @param ugi UGI creating the token.
-   * @param renewer token renewer.
-   * @return new delegation token.
-   * @throws DelegationTokenManagerException thrown if the token could not be
-   * created.
-   */
-  public Token<DelegationTokenIdentifier> createToken(UserGroupInformation ugi,
-                                                      String renewer)
-    throws DelegationTokenManagerException;
-
-  /**
-   * Renews a delegation token.
-   *
-   * @param token delegation token to renew.
-   * @param renewer token renewer.
-   * @return epoc expiration time.
-   * @throws DelegationTokenManagerException thrown if the token could not be
-   * renewed.
-   */
-  public long renewToken(Token<DelegationTokenIdentifier> token, String renewer)
-    throws DelegationTokenManagerException;
-
-  /**
-   * Cancels a delegation token.
-   *
-   * @param token delegation token to cancel.
-   * @param canceler token canceler.
-   * @throws DelegationTokenManagerException thrown if the token could not be
-   * canceled.
-   */
-  public void cancelToken(Token<DelegationTokenIdentifier> token,
-                          String canceler)
-    throws DelegationTokenManagerException;
-
-  /**
-   * Verifies a delegation token.
-   *
-   * @param token delegation token to verify.
-   * @return the UGI for the token.
-   * @throws DelegationTokenManagerException thrown if the token could not be
-   * verified.
-   */
-  public UserGroupInformation verifyToken(Token<DelegationTokenIdentifier> token)
-    throws DelegationTokenManagerException;
-
-}

hadoop-hdfs-project/hadoop-hdfs-httpfs/src/main/java/org/apache/hadoop/lib/service/DelegationTokenManagerException.java

@@ -1,51 +0,0 @@
-/**
- * Licensed to the Apache Software Foundation (ASF) under one
- * or more contributor license agreements.  See the NOTICE file
- * distributed with this work for additional information
- * regarding copyright ownership.  The ASF licenses this file
- * to you under the Apache License, Version 2.0 (the
- * "License"); you may not use this file except in compliance
- * with the License.  You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package org.apache.hadoop.lib.service;
-
-import org.apache.hadoop.classification.InterfaceAudience;
-import org.apache.hadoop.lib.lang.XException;
-
-/**
- * Exception thrown by the {@link DelegationTokenManager} service implementation.
- */
-@InterfaceAudience.Private
-public class DelegationTokenManagerException extends XException {
-
-  public enum ERROR implements XException.ERROR {
-    DT01("Could not verify delegation token, {0}"),
-    DT02("Could not renew delegation token, {0}"),
-    DT03("Could not cancel delegation token, {0}"),
-    DT04("Could not create delegation token, {0}");
-
-    private String template;
-
-    ERROR(String template) {
-      this.template = template;
-    }
-
-    @Override
-    public String getTemplate() {
-      return template;
-    }
-  }
-
-  public DelegationTokenManagerException(ERROR error, Object... params) {
-    super(error, params);
-  }
-
-}

hadoop-hdfs-project/hadoop-hdfs-httpfs/src/main/java/org/apache/hadoop/lib/service/security/DelegationTokenManagerService.java

@@ -1,242 +0,0 @@
-/**
- * Licensed to the Apache Software Foundation (ASF) under one
- * or more contributor license agreements.  See the NOTICE file
- * distributed with this work for additional information
- * regarding copyright ownership.  The ASF licenses this file
- * to you under the Apache License, Version 2.0 (the
- * "License"); you may not use this file except in compliance
- * with the License.  You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package org.apache.hadoop.lib.service.security;
-
-import org.apache.hadoop.classification.InterfaceAudience;
-import org.apache.hadoop.fs.http.server.HttpFSServerWebApp;
-import org.apache.hadoop.hdfs.web.SWebHdfsFileSystem;
-import org.apache.hadoop.hdfs.web.WebHdfsFileSystem;
-import org.apache.hadoop.io.Text;
-import org.apache.hadoop.lib.server.BaseService;
-import org.apache.hadoop.lib.server.ServerException;
-import org.apache.hadoop.lib.server.ServiceException;
-import org.apache.hadoop.lib.service.DelegationTokenIdentifier;
-import org.apache.hadoop.lib.service.DelegationTokenManager;
-import org.apache.hadoop.lib.service.DelegationTokenManagerException;
-import org.apache.hadoop.security.SecurityUtil;
-import org.apache.hadoop.security.UserGroupInformation;
-import org.apache.hadoop.security.token.Token;
-import org.apache.hadoop.security.token.delegation.AbstractDelegationTokenSecretManager;
-
-import java.io.ByteArrayInputStream;
-import java.io.DataInputStream;
-import java.io.IOException;
-
-/**
- * DelegationTokenManager service implementation.
- */
-@InterfaceAudience.Private
-public class DelegationTokenManagerService extends BaseService
-  implements DelegationTokenManager {
-
-  private static final String PREFIX = "delegation.token.manager";
-
-  private static final String UPDATE_INTERVAL = "update.interval";
-
-  private static final String MAX_LIFETIME = "max.lifetime";
-
-  private static final String RENEW_INTERVAL = "renew.interval";
-
-  private static final long HOUR = 60 * 60 * 1000;
-  private static final long DAY = 24 * HOUR;
-
-  DelegationTokenSecretManager secretManager = null;
-
-  private Text tokenKind;
-
-  public DelegationTokenManagerService() {
-    super(PREFIX);
-  }
-
-  /**
-   * Initializes the service.
-   *
-   * @throws ServiceException thrown if the service could not be initialized.
-   */
-  @Override
-  protected void init() throws ServiceException {
-
-    long updateInterval = getServiceConfig().getLong(UPDATE_INTERVAL, DAY);
-    long maxLifetime = getServiceConfig().getLong(MAX_LIFETIME, 7 * DAY);
-    long renewInterval = getServiceConfig().getLong(RENEW_INTERVAL, DAY);
-    tokenKind = (HttpFSServerWebApp.get().isSslEnabled())
-                ? SWebHdfsFileSystem.TOKEN_KIND : WebHdfsFileSystem.TOKEN_KIND;
-    secretManager = new DelegationTokenSecretManager(tokenKind, updateInterval,
-                                                     maxLifetime,
-                                                     renewInterval, HOUR);
-    try {
-      secretManager.startThreads();
-    } catch (IOException ex) {
-      throw new ServiceException(ServiceException.ERROR.S12,
-                                 DelegationTokenManager.class.getSimpleName(),
-                                 ex.toString(), ex);
-    }
-  }
-
-  /**
-   * Destroys the service.
-   */
-  @Override
-  public void destroy() {
-    secretManager.stopThreads();
-    super.destroy();
-  }
-
-  /**
-   * Returns the service interface.
-   *
-   * @return the service interface.
-   */
-  @Override
-  public Class getInterface() {
-    return DelegationTokenManager.class;
-  }
-
-  /**
-   * Creates a delegation token.
-   *
-   * @param ugi UGI creating the token.
-   * @param renewer token renewer.
-   * @return new delegation token.
-   * @throws DelegationTokenManagerException thrown if the token could not be
-   * created.
-   */
-  @Override
-  public Token<DelegationTokenIdentifier> createToken(UserGroupInformation ugi,
-                                                      String renewer)
-    throws DelegationTokenManagerException {
-    renewer = (renewer == null) ? ugi.getShortUserName() : renewer;
-    String user = ugi.getUserName();
-    Text owner = new Text(user);
-    Text realUser = null;
-    if (ugi.getRealUser() != null) {
-      realUser = new Text(ugi.getRealUser().getUserName());
-    }
-    DelegationTokenIdentifier tokenIdentifier =
-      new DelegationTokenIdentifier(tokenKind, owner, new Text(renewer), realUser);
-    Token<DelegationTokenIdentifier> token =
-      new Token<DelegationTokenIdentifier>(tokenIdentifier, secretManager);
-    try {
-      SecurityUtil.setTokenService(token,
-                                   HttpFSServerWebApp.get().getAuthority());
-    } catch (ServerException ex) {
-      throw new DelegationTokenManagerException(
-        DelegationTokenManagerException.ERROR.DT04, ex.toString(), ex);
-    }
-    return token;
-  }
-
-  /**
-   * Renews a delegation token.
-   *
-   * @param token delegation token to renew.
-   * @param renewer token renewer.
-   * @return epoc expiration time.
-   * @throws DelegationTokenManagerException thrown if the token could not be
-   * renewed.
-   */
-  @Override
-  public long renewToken(Token<DelegationTokenIdentifier> token, String renewer)
-    throws DelegationTokenManagerException {
-    try {
-      return secretManager.renewToken(token, renewer);
-    } catch (IOException ex) {
-      throw new DelegationTokenManagerException(
-        DelegationTokenManagerException.ERROR.DT02, ex.toString(), ex);
-    }
-  }
-
-  /**
-   * Cancels a delegation token.
-   *
-   * @param token delegation token to cancel.
-   * @param canceler token canceler.
-   * @throws DelegationTokenManagerException thrown if the token could not be
-   * canceled.
-   */
-  @Override
-  public void cancelToken(Token<DelegationTokenIdentifier> token,
-                          String canceler)
-    throws DelegationTokenManagerException {
-    try {
-      secretManager.cancelToken(token, canceler);
-    } catch (IOException ex) {
-      throw new DelegationTokenManagerException(
-        DelegationTokenManagerException.ERROR.DT03, ex.toString(), ex);
-    }
-  }
-
-  /**
-   * Verifies a delegation token.
-   *
-   * @param token delegation token to verify.
-   * @return the UGI for the token.
-   * @throws DelegationTokenManagerException thrown if the token could not be
-   * verified.
-   */
-  @Override
-  public UserGroupInformation verifyToken(Token<DelegationTokenIdentifier> token)
-    throws DelegationTokenManagerException {
-    ByteArrayInputStream buf = new ByteArrayInputStream(token.getIdentifier());
-    DataInputStream dis = new DataInputStream(buf);
-    DelegationTokenIdentifier id = new DelegationTokenIdentifier(tokenKind);
-    try {
-      id.readFields(dis);
-      dis.close();
-      secretManager.verifyToken(id, token.getPassword());
-    } catch (Exception ex) {
-      throw new DelegationTokenManagerException(
-        DelegationTokenManagerException.ERROR.DT01, ex.toString(), ex);
-    }
-    return id.getUser();
-  }
-
-  private static class DelegationTokenSecretManager
-    extends AbstractDelegationTokenSecretManager<DelegationTokenIdentifier> {
-
-    private Text tokenKind;
-
-    /**
-     * Create a secret manager
-     *
-     * @param delegationKeyUpdateInterval the number of seconds for rolling new
-     * secret keys.
-     * @param delegationTokenMaxLifetime the maximum lifetime of the delegation
-     * tokens
-     * @param delegationTokenRenewInterval how often the tokens must be renewed
-     * @param delegationTokenRemoverScanInterval how often the tokens are
-     * scanned
-     * for expired tokens
-     */
-    public DelegationTokenSecretManager(Text tokenKind, long delegationKeyUpdateInterval,
-                                        long delegationTokenMaxLifetime,
-                                        long delegationTokenRenewInterval,
-                                        long delegationTokenRemoverScanInterval) {
-      super(delegationKeyUpdateInterval, delegationTokenMaxLifetime,
-            delegationTokenRenewInterval, delegationTokenRemoverScanInterval);
-      this.tokenKind = tokenKind;
-    }
-
-    @Override
-    public DelegationTokenIdentifier createIdentifier() {
-      return new DelegationTokenIdentifier(tokenKind);
-    }
-
-  }
-
-}

hadoop-hdfs-project/hadoop-hdfs-httpfs/src/main/resources/httpfs-default.xml

@@ -35,7 +35,6 @@
       org.apache.hadoop.lib.service.scheduler.SchedulerService,
       org.apache.hadoop.lib.service.security.GroupsService,
       org.apache.hadoop.lib.service.security.ProxyUserService,
-      org.apache.hadoop.lib.service.security.DelegationTokenManagerService,
       org.apache.hadoop.lib.service.hadoop.FileSystemAccessService
     </value>
     <description>
@@ -226,12 +225,4 @@
     </description>
   </property>
 
-  <property>
-    <name>httpfs.user.provider.user.pattern</name>
-    <value>^[A-Za-z_][A-Za-z0-9._-]*[$]?$</value>
-    <description>
-      Valid pattern for user and group names, it must be a valid java regex.
-    </description>
-  </property>
-
 </configuration>

hadoop-hdfs-project/hadoop-hdfs-httpfs/src/test/java/org/apache/hadoop/fs/http/server/HttpFSKerberosAuthenticationHandlerForTesting.java

@@ -17,15 +17,19 @@
  */
 package org.apache.hadoop.fs.http.server;
 
+import org.apache.hadoop.security.token.delegation.web.KerberosDelegationTokenAuthenticationHandler;
+
 import javax.servlet.ServletException;
 import java.util.Properties;
 
 public class HttpFSKerberosAuthenticationHandlerForTesting
-  extends HttpFSKerberosAuthenticationHandler {
+  extends KerberosDelegationTokenAuthenticationHandler {
 
   @Override
   public void init(Properties config) throws ServletException {
     //NOP overwrite to avoid Kerberos initialization
+    config.setProperty(TOKEN_KIND, "t");
+    initTokenManager(config);
   }
 
   @Override

hadoop-hdfs-project/hadoop-hdfs-httpfs/src/test/java/org/apache/hadoop/fs/http/server/TestHttpFSCustomUserName.java

@@ -1,94 +0,0 @@
-/**
- * Licensed to the Apache Software Foundation (ASF) under one
- * or more contributor license agreements.  See the NOTICE file
- * distributed with this work for additional information
- * regarding copyright ownership.  The ASF licenses this file
- * to you under the Apache License, Version 2.0 (the
- * "License"); you may not use this file except in compliance
- * with the License.  You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package org.apache.hadoop.fs.http.server;
-
-import org.apache.hadoop.conf.Configuration;
-import org.apache.hadoop.fs.CommonConfigurationKeysPublic;
-import org.apache.hadoop.fs.FileSystem;
-import org.apache.hadoop.fs.Path;
-import org.apache.hadoop.fs.http.client.HttpFSKerberosAuthenticator;
-import org.apache.hadoop.lib.server.Service;
-import org.apache.hadoop.lib.server.ServiceException;
-import org.apache.hadoop.lib.service.Groups;
-import org.apache.hadoop.lib.wsrs.UserProvider;
-import org.apache.hadoop.security.authentication.client.AuthenticatedURL;
-import org.apache.hadoop.security.authentication.server.AuthenticationToken;
-import org.apache.hadoop.security.authentication.util.Signer;
-import org.apache.hadoop.test.HFSTestCase;
-import org.apache.hadoop.test.HadoopUsersConfTestHelper;
-import org.apache.hadoop.test.TestDir;
-import org.apache.hadoop.test.TestDirHelper;
-import org.apache.hadoop.test.TestHdfs;
-import org.apache.hadoop.test.TestHdfsHelper;
-import org.apache.hadoop.test.TestJetty;
-import org.apache.hadoop.test.TestJettyHelper;
-import org.json.simple.JSONObject;
-import org.json.simple.parser.JSONParser;
-import org.junit.Assert;
-import org.junit.Test;
-import org.mortbay.jetty.Server;
-import org.mortbay.jetty.webapp.WebAppContext;
-
-import java.io.BufferedReader;
-import java.io.File;
-import java.io.FileOutputStream;
-import java.io.FileWriter;
-import java.io.IOException;
-import java.io.InputStream;
-import java.io.InputStreamReader;
-import java.io.OutputStream;
-import java.io.Writer;
-import java.net.HttpURLConnection;
-import java.net.URL;
-import java.text.MessageFormat;
-import java.util.Arrays;
-import java.util.List;
-
-public class TestHttpFSCustomUserName extends HFSTestCase {
-
-  @Test
-  @TestDir
-  @TestJetty
-  public void defaultUserName() throws Exception {
-    String dir = TestDirHelper.getTestDir().getAbsolutePath();
-
-    Configuration httpfsConf = new Configuration(false);
-    HttpFSServerWebApp server = 
-      new HttpFSServerWebApp(dir, dir, dir, dir, httpfsConf);
-    server.init();
-    Assert.assertEquals(UserProvider.USER_PATTERN_DEFAULT, 
-      UserProvider.getUserPattern().pattern());
-    server.destroy();
-  }
-
-  @Test
-  @TestDir
-  @TestJetty
-  public void customUserName() throws Exception {
-    String dir = TestDirHelper.getTestDir().getAbsolutePath();
-
-    Configuration httpfsConf = new Configuration(false);
-    httpfsConf.set(UserProvider.USER_PATTERN_KEY, "1");
-    HttpFSServerWebApp server =
-      new HttpFSServerWebApp(dir, dir, dir, dir, httpfsConf);
-    server.init();
-    Assert.assertEquals("1", UserProvider.getUserPattern().pattern());
-    server.destroy();
-  }
-
-}

hadoop-hdfs-project/hadoop-hdfs-httpfs/src/test/java/org/apache/hadoop/fs/http/server/TestHttpFSKerberosAuthenticationHandler.java

@@ -1,316 +0,0 @@
-/**
- * Licensed to the Apache Software Foundation (ASF) under one
- * or more contributor license agreements.  See the NOTICE file
- * distributed with this work for additional information
- * regarding copyright ownership.  The ASF licenses this file
- * to you under the Apache License, Version 2.0 (the
- * "License"); you may not use this file except in compliance
- * with the License.  You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.apache.hadoop.fs.http.server;
-
-import org.apache.hadoop.conf.Configuration;
-import org.apache.hadoop.fs.http.client.HttpFSFileSystem;
-import org.apache.hadoop.fs.http.client.HttpFSKerberosAuthenticator;
-import org.apache.hadoop.fs.http.client.HttpFSKerberosAuthenticator.DelegationTokenOperation;
-import org.apache.hadoop.hdfs.web.SWebHdfsFileSystem;
-import org.apache.hadoop.hdfs.web.WebHdfsFileSystem;
-import org.apache.hadoop.io.Text;
-import org.apache.hadoop.lib.service.DelegationTokenIdentifier;
-import org.apache.hadoop.lib.service.DelegationTokenManager;
-import org.apache.hadoop.lib.service.DelegationTokenManagerException;
-import org.apache.hadoop.lib.servlet.ServerWebApp;
-import org.apache.hadoop.security.UserGroupInformation;
-import org.apache.hadoop.security.authentication.client.AuthenticationException;
-import org.apache.hadoop.security.authentication.server.AuthenticationHandler;
-import org.apache.hadoop.security.authentication.server.AuthenticationToken;
-import org.apache.hadoop.security.token.Token;
-import org.apache.hadoop.test.HFSTestCase;
-import org.apache.hadoop.test.TestDir;
-import org.apache.hadoop.test.TestDirHelper;
-import org.json.simple.JSONObject;
-import org.json.simple.parser.JSONParser;
-import org.junit.Assert;
-import org.junit.Test;
-import org.mockito.Mockito;
-
-import javax.servlet.http.HttpServletRequest;
-import javax.servlet.http.HttpServletResponse;
-import javax.ws.rs.core.MediaType;
-import java.io.PrintWriter;
-import java.io.StringWriter;
-import java.net.InetAddress;
-import java.net.InetSocketAddress;
-
-public class TestHttpFSKerberosAuthenticationHandler extends HFSTestCase {
-
-  @Test
-  @TestDir
-  public void testManagementOperationsWebHdfsFileSystem() throws Exception {
-    testManagementOperations(WebHdfsFileSystem.TOKEN_KIND);
-  }
-
-  @Test
-  @TestDir
-  public void testManagementOperationsSWebHdfsFileSystem() throws Exception {
-    try {
-      System.setProperty(HttpFSServerWebApp.NAME +
-          ServerWebApp.SSL_ENABLED, "true");
-      testManagementOperations(SWebHdfsFileSystem.TOKEN_KIND);
-    } finally {
-      System.getProperties().remove(HttpFSServerWebApp.NAME +
-          ServerWebApp.SSL_ENABLED);
-    }
-  }
-
-  private void testManagementOperations(Text expectedTokenKind) throws Exception {
-    String dir = TestDirHelper.getTestDir().getAbsolutePath();
-
-    Configuration httpfsConf = new Configuration(false);
-    HttpFSServerWebApp server =
-      new HttpFSServerWebApp(dir, dir, dir, dir, httpfsConf);
-    server.setAuthority(new InetSocketAddress(InetAddress.getLocalHost(), 
-                                              14000));
-    AuthenticationHandler handler =
-      new HttpFSKerberosAuthenticationHandlerForTesting();
-    try {
-      server.init();
-      handler.init(null);
-
-      testNonManagementOperation(handler);
-      testManagementOperationErrors(handler);
-      testGetToken(handler, null, expectedTokenKind);
-      testGetToken(handler, "foo", expectedTokenKind);
-      testCancelToken(handler);
-      testRenewToken(handler);
-
-    } finally {
-      if (handler != null) {
-        handler.destroy();
-      }
-    server.destroy();
-    }
-  }
-
-  private void testNonManagementOperation(AuthenticationHandler handler)
-    throws Exception {
-    HttpServletRequest request = Mockito.mock(HttpServletRequest.class);
-    Mockito.when(request.getParameter(HttpFSFileSystem.OP_PARAM)).
-      thenReturn(null);
-    Assert.assertTrue(handler.managementOperation(null, request, null));
-    Mockito.when(request.getParameter(HttpFSFileSystem.OP_PARAM)).
-      thenReturn(HttpFSFileSystem.Operation.CREATE.toString());
-    Assert.assertTrue(handler.managementOperation(null, request, null));
-  }
-
-  private void testManagementOperationErrors(AuthenticationHandler handler)
-    throws Exception {
-    HttpServletRequest request = Mockito.mock(HttpServletRequest.class);
-    HttpServletResponse response = Mockito.mock(HttpServletResponse.class);
-    Mockito.when(request.getParameter(HttpFSFileSystem.OP_PARAM)).
-      thenReturn(DelegationTokenOperation.GETDELEGATIONTOKEN.toString());
-    Mockito.when(request.getMethod()).thenReturn("FOO");
-    Assert.assertFalse(handler.managementOperation(null, request, response));
-    Mockito.verify(response).sendError(
-      Mockito.eq(HttpServletResponse.SC_BAD_REQUEST),
-      Mockito.startsWith("Wrong HTTP method"));
-
-    Mockito.reset(response);
-    Mockito.when(request.getMethod()).
-      thenReturn(DelegationTokenOperation.GETDELEGATIONTOKEN.getHttpMethod());
-    Assert.assertFalse(handler.managementOperation(null, request, response));
-    Mockito.verify(response).sendError(
-      Mockito.eq(HttpServletResponse.SC_UNAUTHORIZED),
-      Mockito.contains("requires SPNEGO"));
-  }
-
-  private void testGetToken(AuthenticationHandler handler, String renewer,
-      Text expectedTokenKind) throws Exception {
-    DelegationTokenOperation op = DelegationTokenOperation.GETDELEGATIONTOKEN;
-    HttpServletRequest request = Mockito.mock(HttpServletRequest.class);
-    HttpServletResponse response = Mockito.mock(HttpServletResponse.class);
-    Mockito.when(request.getParameter(HttpFSFileSystem.OP_PARAM)).
-      thenReturn(op.toString());
-    Mockito.when(request.getMethod()).
-      thenReturn(op.getHttpMethod());
-
-    AuthenticationToken token = Mockito.mock(AuthenticationToken.class);
-    Mockito.when(token.getUserName()).thenReturn("user");
-    Assert.assertFalse(handler.managementOperation(null, request, response));
-    Mockito.when(request.getParameter(HttpFSKerberosAuthenticator.RENEWER_PARAM)).
-      thenReturn(renewer);
-
-    Mockito.reset(response);
-    StringWriter writer = new StringWriter();
-    PrintWriter pwriter = new PrintWriter(writer);
-    Mockito.when(response.getWriter()).thenReturn(pwriter);
-    Assert.assertFalse(handler.managementOperation(token, request, response));
-    if (renewer == null) {
-      Mockito.verify(token).getUserName();
-    } else {
-      Mockito.verify(token, Mockito.never()).getUserName();
-    }
-    Mockito.verify(response).setStatus(HttpServletResponse.SC_OK);
-    Mockito.verify(response).setContentType(MediaType.APPLICATION_JSON);
-    pwriter.close();
-    String responseOutput = writer.toString();
-    String tokenLabel = HttpFSKerberosAuthenticator.DELEGATION_TOKEN_JSON;
-    Assert.assertTrue(responseOutput.contains(tokenLabel));
-    Assert.assertTrue(responseOutput.contains(
-      HttpFSKerberosAuthenticator.DELEGATION_TOKEN_URL_STRING_JSON));
-    JSONObject json = (JSONObject) new JSONParser().parse(responseOutput);
-    json = (JSONObject) json.get(tokenLabel);
-    String tokenStr;
-    tokenStr = (String)
-      json.get(HttpFSKerberosAuthenticator.DELEGATION_TOKEN_URL_STRING_JSON);
-    Token<DelegationTokenIdentifier> dt = new Token<DelegationTokenIdentifier>();
-    dt.decodeFromUrlString(tokenStr);
-    HttpFSServerWebApp.get().get(DelegationTokenManager.class).verifyToken(dt);
-    Assert.assertEquals(expectedTokenKind, dt.getKind());
-  }
-
-  private void testCancelToken(AuthenticationHandler handler)
-    throws Exception {
-    DelegationTokenOperation op =
-      DelegationTokenOperation.CANCELDELEGATIONTOKEN;
-    HttpServletRequest request = Mockito.mock(HttpServletRequest.class);
-    HttpServletResponse response = Mockito.mock(HttpServletResponse.class);
-    Mockito.when(request.getParameter(HttpFSFileSystem.OP_PARAM)).
-      thenReturn(op.toString());
-    Mockito.when(request.getMethod()).
-      thenReturn(op.getHttpMethod());
-
-    Assert.assertFalse(handler.managementOperation(null, request, response));
-    Mockito.verify(response).sendError(
-      Mockito.eq(HttpServletResponse.SC_BAD_REQUEST),
-      Mockito.contains("requires the parameter [token]"));
-
-    Mockito.reset(response);
-    Token<DelegationTokenIdentifier> token =
-      HttpFSServerWebApp.get().get(DelegationTokenManager.class).createToken(
-        UserGroupInformation.getCurrentUser(), "foo");
-    Mockito.when(request.getParameter(HttpFSKerberosAuthenticator.TOKEN_PARAM)).
-      thenReturn(token.encodeToUrlString());
-    Assert.assertFalse(handler.managementOperation(null, request, response));
-    Mockito.verify(response).setStatus(HttpServletResponse.SC_OK);
-    try {
-      HttpFSServerWebApp.get().get(DelegationTokenManager.class).verifyToken(token);
-      Assert.fail();
-    }
-    catch (DelegationTokenManagerException ex) {
-      Assert.assertTrue(ex.toString().contains("DT01"));
-    }
-  }
-
-  private void testRenewToken(AuthenticationHandler handler)
-    throws Exception {
-    DelegationTokenOperation op =
-      DelegationTokenOperation.RENEWDELEGATIONTOKEN;
-    HttpServletRequest request = Mockito.mock(HttpServletRequest.class);
-    HttpServletResponse response = Mockito.mock(HttpServletResponse.class);
-    Mockito.when(request.getParameter(HttpFSFileSystem.OP_PARAM)).
-      thenReturn(op.toString());
-    Mockito.when(request.getMethod()).
-      thenReturn(op.getHttpMethod());
-
-    Assert.assertFalse(handler.managementOperation(null, request, response));
-    Mockito.verify(response).sendError(
-      Mockito.eq(HttpServletResponse.SC_UNAUTHORIZED),
-      Mockito.contains("equires SPNEGO authentication established"));
-
-    Mockito.reset(response);
-    AuthenticationToken token = Mockito.mock(AuthenticationToken.class);
-    Mockito.when(token.getUserName()).thenReturn("user");
-    Assert.assertFalse(handler.managementOperation(token, request, response));
-    Mockito.verify(response).sendError(
-      Mockito.eq(HttpServletResponse.SC_BAD_REQUEST),
-      Mockito.contains("requires the parameter [token]"));
-
-    Mockito.reset(response);
-    StringWriter writer = new StringWriter();
-    PrintWriter pwriter = new PrintWriter(writer);
-    Mockito.when(response.getWriter()).thenReturn(pwriter);
-    Token<DelegationTokenIdentifier> dToken =
-      HttpFSServerWebApp.get().get(DelegationTokenManager.class).createToken(
-        UserGroupInformation.getCurrentUser(), "user");
-    Mockito.when(request.getParameter(HttpFSKerberosAuthenticator.TOKEN_PARAM)).
-      thenReturn(dToken.encodeToUrlString());
-    Assert.assertFalse(handler.managementOperation(token, request, response));
-    Mockito.verify(response).setStatus(HttpServletResponse.SC_OK);
-    pwriter.close();
-    Assert.assertTrue(writer.toString().contains("long"));
-    HttpFSServerWebApp.get().get(DelegationTokenManager.class).verifyToken(dToken);
-  }
-
-  @Test
-  @TestDir
-  public void testAuthenticate() throws Exception {
-    String dir = TestDirHelper.getTestDir().getAbsolutePath();
-
-    Configuration httpfsConf = new Configuration(false);
-    HttpFSServerWebApp server =
-      new HttpFSServerWebApp(dir, dir, dir, dir, httpfsConf);
-    server.setAuthority(new InetSocketAddress(InetAddress.getLocalHost(),
-                                              14000));
-    AuthenticationHandler handler =
-      new HttpFSKerberosAuthenticationHandlerForTesting();
-    try {
-      server.init();
-      handler.init(null);
-
-      testValidDelegationToken(handler);
-      testInvalidDelegationToken(handler);
-    } finally {
-      if (handler != null) {
-        handler.destroy();
-      }
-    server.destroy();
-    }
-  }
-
-  private void testValidDelegationToken(AuthenticationHandler handler)
-    throws Exception {
-    HttpServletRequest request = Mockito.mock(HttpServletRequest.class);
-    HttpServletResponse response = Mockito.mock(HttpServletResponse.class);
-    Token<DelegationTokenIdentifier> dToken =
-      HttpFSServerWebApp.get().get(DelegationTokenManager.class).createToken(
-        UserGroupInformation.getCurrentUser(), "user");
-    Mockito.when(request.getParameter(HttpFSKerberosAuthenticator.DELEGATION_PARAM)).
-      thenReturn(dToken.encodeToUrlString());
-
-    AuthenticationToken token = handler.authenticate(request, response);
-    Assert.assertEquals(UserGroupInformation.getCurrentUser().getShortUserName(),
-                        token.getUserName());
-    Assert.assertEquals(0, token.getExpires());
-    Assert.assertEquals(HttpFSKerberosAuthenticationHandler.TYPE,
-                        token.getType());
-    Assert.assertTrue(token.isExpired());
-  }
-
-  private void testInvalidDelegationToken(AuthenticationHandler handler)
-    throws Exception {
-    HttpServletRequest request = Mockito.mock(HttpServletRequest.class);
-    HttpServletResponse response = Mockito.mock(HttpServletResponse.class);
-    Mockito.when(request.getParameter(HttpFSKerberosAuthenticator.DELEGATION_PARAM)).
-      thenReturn("invalid");
-
-    try {
-      handler.authenticate(request, response);
-      Assert.fail();
-    } catch (AuthenticationException ex) {
-      //NOP
-    } catch (Exception ex) {
-      Assert.fail();
-    }
-  }
-
-}

hadoop-hdfs-project/hadoop-hdfs-httpfs/src/test/java/org/apache/hadoop/fs/http/server/TestHttpFSServer.java

@@ -18,6 +18,8 @@
 package org.apache.hadoop.fs.http.server;
 
 import org.apache.hadoop.hdfs.DFSConfigKeys;
+import org.apache.hadoop.security.token.delegation.web.DelegationTokenAuthenticator;
+import org.apache.hadoop.security.token.delegation.web.KerberosDelegationTokenAuthenticationHandler;
 import org.json.simple.JSONArray;
 import org.junit.Assert;
 
@@ -43,7 +45,6 @@ import org.apache.hadoop.fs.CommonConfigurationKeysPublic;
 import org.apache.hadoop.fs.FileSystem;
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.fs.XAttrCodec;
-import org.apache.hadoop.fs.http.client.HttpFSKerberosAuthenticator;
 import org.apache.hadoop.lib.server.Service;
 import org.apache.hadoop.lib.server.ServiceException;
 import org.apache.hadoop.lib.service.Groups;
@@ -682,7 +683,7 @@ public class TestHttpFSServer extends HFSTestCase {
 
     AuthenticationToken token =
       new AuthenticationToken("u", "p",
-        HttpFSKerberosAuthenticationHandlerForTesting.TYPE);
+          new KerberosDelegationTokenAuthenticationHandler().getType());
     token.setExpires(System.currentTimeMillis() + 100000000);
     Signer signer = new Signer(new StringSignerSecretProvider("secret"));
     String tokenSigned = signer.sign(token.toString());
@@ -706,9 +707,9 @@ public class TestHttpFSServer extends HFSTestCase {
     JSONObject json = (JSONObject)
       new JSONParser().parse(new InputStreamReader(conn.getInputStream()));
     json = (JSONObject)
-      json.get(HttpFSKerberosAuthenticator.DELEGATION_TOKEN_JSON);
+      json.get(DelegationTokenAuthenticator.DELEGATION_TOKEN_JSON);
     String tokenStr = (String)
-        json.get(HttpFSKerberosAuthenticator.DELEGATION_TOKEN_URL_STRING_JSON);
+        json.get(DelegationTokenAuthenticator.DELEGATION_TOKEN_URL_STRING_JSON);
 
     url = new URL(TestJettyHelper.getJettyURL(),
                   "/webhdfs/v1/?op=GETHOMEDIRECTORY&delegation=" + tokenStr);

hadoop-hdfs-project/hadoop-hdfs-httpfs/src/test/java/org/apache/hadoop/fs/http/server/TestHttpFSWithKerberos.java

@@ -23,11 +23,11 @@ import org.apache.hadoop.fs.DelegationTokenRenewer;
 import org.apache.hadoop.fs.FileSystem;
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.fs.http.client.HttpFSFileSystem;
-import org.apache.hadoop.fs.http.client.HttpFSKerberosAuthenticator;
 import org.apache.hadoop.hdfs.web.WebHdfsFileSystem;
 import org.apache.hadoop.security.UserGroupInformation;
 import org.apache.hadoop.security.authentication.client.AuthenticatedURL;
 import org.apache.hadoop.security.token.Token;
+import org.apache.hadoop.security.token.delegation.web.DelegationTokenAuthenticator;
 import org.apache.hadoop.test.HFSTestCase;
 import org.apache.hadoop.test.KerberosTestUtils;
 import org.apache.hadoop.test.TestDir;
@@ -166,9 +166,9 @@ public class TestHttpFSWithKerberos extends HFSTestCase {
           .parse(new InputStreamReader(conn.getInputStream()));
         json =
           (JSONObject) json
-            .get(HttpFSKerberosAuthenticator.DELEGATION_TOKEN_JSON);
+            .get(DelegationTokenAuthenticator.DELEGATION_TOKEN_JSON);
         String tokenStr = (String) json
-          .get(HttpFSKerberosAuthenticator.DELEGATION_TOKEN_URL_STRING_JSON);
+          .get(DelegationTokenAuthenticator.DELEGATION_TOKEN_URL_STRING_JSON);
 
         //access httpfs using the delegation token
         url = new URL(TestJettyHelper.getJettyURL(),

hadoop-hdfs-project/hadoop-hdfs-httpfs/src/test/java/org/apache/hadoop/lib/service/security/TestDelegationTokenManagerService.java

@@ -1,89 +0,0 @@
-/**
- * Licensed to the Apache Software Foundation (ASF) under one
- * or more contributor license agreements.  See the NOTICE file
- * distributed with this work for additional information
- * regarding copyright ownership.  The ASF licenses this file
- * to you under the Apache License, Version 2.0 (the
- * "License"); you may not use this file except in compliance
- * with the License.  You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.apache.hadoop.lib.service.security;
-
-import org.apache.hadoop.conf.Configuration;
-import org.apache.hadoop.fs.http.server.HttpFSServerWebApp;
-import org.apache.hadoop.lib.server.Server;
-import org.apache.hadoop.lib.service.DelegationTokenManager;
-import org.apache.hadoop.lib.service.DelegationTokenManagerException;
-import org.apache.hadoop.lib.service.hadoop.FileSystemAccessService;
-import org.apache.hadoop.lib.service.instrumentation.InstrumentationService;
-import org.apache.hadoop.lib.service.scheduler.SchedulerService;
-import org.apache.hadoop.security.UserGroupInformation;
-import org.apache.hadoop.security.token.Token;
-import org.apache.hadoop.test.HTestCase;
-import org.apache.hadoop.test.TestDir;
-import org.apache.hadoop.test.TestDirHelper;
-import org.apache.hadoop.util.StringUtils;
-import org.junit.Assert;
-import org.junit.Test;
-
-import java.net.InetAddress;
-import java.net.InetSocketAddress;
-import java.util.Arrays;
-
-public class TestDelegationTokenManagerService extends HTestCase {
-
-  @Test
-  @TestDir
-  public void service() throws Exception {
-    String dir = TestDirHelper.getTestDir().getAbsolutePath();
-    Configuration conf = new Configuration(false);
-    conf.set("httpfs.services", StringUtils.join(",",
-      Arrays.asList(InstrumentationService.class.getName(),
-          SchedulerService.class.getName(),
-          FileSystemAccessService.class.getName(),
-          DelegationTokenManagerService.class.getName())));
-    Server server = new HttpFSServerWebApp(dir, dir, dir, dir, conf);
-    server.init();
-    DelegationTokenManager tm = server.get(DelegationTokenManager.class);
-    Assert.assertNotNull(tm);
-    server.destroy();
-  }
-
-  @Test
-  @TestDir
-  @SuppressWarnings("unchecked")
-  public void tokens() throws Exception {
-    String dir = TestDirHelper.getTestDir().getAbsolutePath();
-    Configuration conf = new Configuration(false);
-    conf.set("server.services", StringUtils.join(",",
-      Arrays.asList(DelegationTokenManagerService.class.getName())));
-    HttpFSServerWebApp server = new HttpFSServerWebApp(dir, dir, dir, dir, conf);
-    server.setAuthority(new InetSocketAddress(InetAddress.getLocalHost(), 14000));
-    server.init();
-    DelegationTokenManager tm = server.get(DelegationTokenManager.class);
-    Token token = tm.createToken(UserGroupInformation.getCurrentUser(), "foo");
-    Assert.assertNotNull(token);
-    tm.verifyToken(token);
-    Assert.assertTrue(tm.renewToken(token, "foo") > System.currentTimeMillis());
-    tm.cancelToken(token, "foo");
-    try {
-      tm.verifyToken(token);
-      Assert.fail();
-    } catch (DelegationTokenManagerException ex) {
-      //NOP
-    } catch (Exception ex) {
-      Assert.fail();
-    }
-    server.destroy();
-  }
-
-}

hadoop-hdfs-project/hadoop-hdfs-nfs/src/main/java/org/apache/hadoop/hdfs/nfs/nfs3/RpcProgramNfs3.java

@@ -724,6 +724,10 @@ public class RpcProgramNfs3 extends RpcProgram implements Nfs3Interface {
         FSDataInputStream fis = clientCache.getDfsInputStream(userName,
             Nfs3Utils.getFileIdPath(handle));
 
+        if (fis == null) {
+            return new READ3Response(Nfs3Status.NFS3ERR_ACCES);
+        }
+
         try {
           readCount = fis.read(offset, readbuffer, 0, count);
         } catch (IOException e) {

hadoop-hdfs-project/hadoop-hdfs-nfs/src/test/java/org/apache/hadoop/hdfs/nfs/nfs3/TestRpcProgramNfs3.java

@@ -278,13 +278,11 @@ public class TestRpcProgramNfs3 {
     readReq.serialize(xdr_req);
 
     // Attempt by an unpriviledged user should fail.
-    /* Hits HDFS-6582. It needs to be fixed first.
     READ3Response response1 = nfsd.read(xdr_req.asReadOnlyWrap(),
         securityHandlerUnpriviledged,
         new InetSocketAddress("localhost", 1234));
     assertEquals("Incorrect return code:", Nfs3Status.NFS3ERR_ACCES,
         response1.getStatus());
-    */
 
     // Attempt by a priviledged user should pass.
     READ3Response response2 = nfsd.read(xdr_req.asReadOnlyWrap(),

hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt

@@ -370,12 +370,38 @@ Release 2.6.0 - UNRELEASED
     HDFS-6781. Separate HDFS commands from CommandsManual.apt.vm. (Akira
     Ajisaka via Arpit Agarwal)
 
+    HDFS-6728. Dynamically add new volumes to DataStorage, formatted if
+    necessary. (Lei Xu via atm)
+
+    HDFS-6740. Make FSDataset support adding data volumes dynamically. (Lei
+    Xu via atm)
+
+    HDFS-6722. Display readable last contact time for dead nodes on NN webUI.
+    (Ming Ma via wheat9)
+
+    HDFS-6772. Get DN storages out of blockContentsStale state faster after
+    NN restarts. (Ming Ma via Arpit Agarwal)
+
+    HDFS-573. Porting libhdfs to Windows. (cnauroth)
+
+    HDFS-6828. Separate block replica dispatching from Balancer. (szetszwo via
+    jing9)
+
+    HDFS-6837. Code cleanup for Balancer and Dispatcher. (szetszwo via
+    jing9)
+
+    HDFS-6838. Code cleanup for unnecessary INode replacement.
+    (Jing Zhao via wheat9)
+
   OPTIMIZATIONS
 
     HDFS-6690. Deduplicate xattr names in memory. (wang)
 
   BUG FIXES
 
+    HDFS-6823. dfs.web.authentication.kerberos.principal shows up in logs for 
+    insecure HDFS (Allen Wittenauer via raviprak)
+
     HDFS-6617. Flake TestDFSZKFailoverController.testManualFailoverWithDFSHAAdmin
     due to a long edit log sync op. (Liang Xie via cnauroth)
 
@@ -462,6 +488,9 @@ Release 2.6.0 - UNRELEASED
     HDFS-6791. A block could remain under replicated if all of its replicas are on
     decommissioned nodes. (Ming Ma via jing9)
 
+    HDFS-6582. Missing null check in RpcProgramNfs3#read(XDR, SecurityHandler)
+    (Abhiraj Butala via brandonli)
+
 Release 2.5.0 - UNRELEASED
 
   INCOMPATIBLE CHANGES

hadoop-hdfs-project/hadoop-hdfs/pom.xml

@@ -361,16 +361,97 @@ http://maven.apache.org/xsd/maven-4.0.0.xsd">
 
   <profiles>
     <profile>
-      <id>windows</id>
+      <id>native-win</id>
       <activation>
         <activeByDefault>false</activeByDefault>
         <os>
           <family>windows</family>
         </os>
       </activation>
-      <properties>
-        <windows.build>true</windows.build>
-      </properties>
+      <build>
+        <plugins>
+          <plugin>
+            <groupId>org.apache.maven.plugins</groupId>
+            <artifactId>maven-enforcer-plugin</artifactId>
+            <executions>
+              <execution>
+                <id>enforce-os</id>
+                <goals>
+                  <goal>enforce</goal>
+                </goals>
+                <configuration>
+                  <rules>
+                    <requireOS>
+                      <family>windows</family>
+                      <message>native-win build only supported on Windows</message>
+                    </requireOS>
+                  </rules>
+                  <fail>true</fail>
+                </configuration>
+              </execution>
+            </executions>
+          </plugin>
+          <plugin>
+            <groupId>org.apache.maven.plugins</groupId>
+            <artifactId>maven-antrun-plugin</artifactId>
+            <executions>
+              <execution>
+                <id>make</id>
+                <phase>compile</phase>
+                <goals>
+                  <goal>run</goal>
+                </goals>
+                <configuration>
+                  <target>
+                    <mkdir dir="${project.build.directory}/native"/>
+                    <exec executable="cmake" dir="${project.build.directory}/native"
+                        failonerror="true">
+                      <arg line="${basedir}/src/ -DGENERATED_JAVAH=${project.build.directory}/native/javah -DJVM_ARCH_DATA_MODEL=${sun.arch.data.model} -DREQUIRE_LIBWEBHDFS=${require.libwebhdfs} -DREQUIRE_FUSE=${require.fuse} -G 'Visual Studio 10 Win64'"/>
+                    </exec>
+                    <exec executable="msbuild" dir="${project.build.directory}/native"
+                        failonerror="true">
+                      <arg line="ALL_BUILD.vcxproj /nologo /p:Configuration=Release"/>
+                    </exec>
+                    <!-- Copy for inclusion in distribution. -->
+                    <copy todir="${project.build.directory}/bin">
+                      <fileset dir="${project.build.directory}/native/target/bin/Release"/>
+                    </copy>
+                  </target>
+                </configuration>
+              </execution>
+              <execution>
+                <id>native_tests</id>
+                <phase>test</phase>
+                <goals><goal>run</goal></goals>
+                <configuration>
+                  <skip>${skipTests}</skip>
+                  <target>
+                    <property name="compile_classpath" refid="maven.compile.classpath"/>
+                    <property name="test_classpath" refid="maven.test.classpath"/>
+                    <macrodef name="run-test">
+                      <attribute name="test"/>
+                      <sequential>
+                        <echo message="Running @{test}"/>
+                        <exec executable="${project.build.directory}/native/Release/@{test}" failonerror="true" dir="${project.build.directory}/native/">
+                          <env key="CLASSPATH" value="${test_classpath}:${compile_classpath}"/>
+                          <!-- HADOOP_HOME required to find winutils. -->
+                          <env key="HADOOP_HOME" value="${hadoop.common.build.dir}"/>
+                          <!-- Make sure hadoop.dll and jvm.dll are on PATH. -->
+                          <env key="PATH" value="${env.PATH};${hadoop.common.build.dir}/bin;${java.home}/jre/bin/server;${java.home}/bin/server"/>
+                        </exec>
+                        <echo message="Finished @{test}"/>
+                      </sequential>
+                    </macrodef>
+                    <run-test test="test_libhdfs_threaded"/>
+                    <echo message="Skipping test_libhdfs_zerocopy"/>
+                    <run-test test="test_native_mini_dfs"/>
+                  </target>
+                </configuration>
+              </execution>
+            </executions>
+          </plugin>
+        </plugins>
+      </build>
     </profile>
     <profile>
       <id>native</id>
@@ -408,21 +489,25 @@ http://maven.apache.org/xsd/maven-4.0.0.xsd">
                 <phase>test</phase>
                 <goals><goal>run</goal></goals>
                 <configuration>
+                  <skip>${skipTests}</skip>
                   <target>
                     <property name="compile_classpath" refid="maven.compile.classpath"/>
                     <property name="test_classpath" refid="maven.test.classpath"/>
-                    <exec executable="sh" failonerror="true" dir="${project.build.directory}/native/">
-                      <arg value="-c"/>
-                      <arg value="[ x$SKIPTESTS = xtrue ] || ${project.build.directory}/native/test_libhdfs_threaded"/>
-                      <env key="CLASSPATH" value="${test_classpath}:${compile_classpath}"/>
-                      <env key="SKIPTESTS" value="${skipTests}"/>
-                    </exec>
-                    <exec executable="sh" failonerror="true" dir="${project.build.directory}/native/">
-                        <arg value="-c"/>
-                        <arg value="[ x$SKIPTESTS = xtrue ] || ${project.build.directory}/native/test_native_mini_dfs"/>
-                      <env key="CLASSPATH" value="${test_classpath}:${compile_classpath}"/>
-                      <env key="SKIPTESTS" value="${skipTests}"/>
-                    </exec>
+                    <macrodef name="run-test">
+                      <attribute name="test"/>
+                      <sequential>
+                        <echo message="Running @{test}"/>
+                        <exec executable="${project.build.directory}/native/@{test}" failonerror="true" dir="${project.build.directory}/native/">
+                          <env key="CLASSPATH" value="${test_classpath}:${compile_classpath}"/>
+                          <!-- Make sure libhadoop.so is on LD_LIBRARY_PATH. -->
+                          <env key="LD_LIBRARY_PATH" value="${env.LD_LIBRARY_PATH}:${project.build.directory}/native/target/usr/local/lib:${hadoop.common.build.dir}/native/target/usr/local/lib"/>
+                        </exec>
+                        <echo message="Finished @{test}"/>
+                      </sequential>
+                    </macrodef>
+                    <run-test test="test_libhdfs_threaded"/>
+                    <run-test test="test_libhdfs_zerocopy"/>
+                    <run-test test="test_native_mini_dfs"/>
                   </target>
                 </configuration>
               </execution>

hadoop-hdfs-project/hadoop-hdfs/src/CMakeLists.txt

@@ -76,9 +76,39 @@ if (NOT GENERATED_JAVAH)
     MESSAGE(FATAL_ERROR "You must set the CMake variable GENERATED_JAVAH")
 endif (NOT GENERATED_JAVAH)
 
-set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -g -Wall -O2")
-set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -D_REENTRANT -D_GNU_SOURCE")
-set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64")
+if (WIN32)
+    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} /O2")
+
+    # Set warning level 4.
+    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} /W4")
+
+    # Skip "unreferenced formal parameter".
+    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} /wd4100")
+
+    # Skip "conditional expression is constant".
+    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} /wd4127")
+
+    # Skip deprecated POSIX function warnings.
+    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -D_CRT_NONSTDC_NO_DEPRECATE")
+
+    # Skip CRT non-secure function warnings.  If we can convert usage of
+    # strerror, getenv and ctime to their secure CRT equivalents, then we can
+    # re-enable the CRT non-secure function warnings.
+    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -D_CRT_SECURE_NO_WARNINGS")
+
+    # Omit unneeded headers.
+    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -DWIN32_LEAN_AND_MEAN")
+
+    set(OS_DIR main/native/libhdfs/os/windows)
+    set(OUT_DIR target/bin)
+else (WIN32)
+    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -g -Wall -O2")
+    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -D_REENTRANT -D_GNU_SOURCE")
+    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64")
+    set(OS_DIR main/native/libhdfs/os/posix)
+    set(OS_LINK_LIBRARIES pthread)
+    set(OUT_DIR target/usr/local/lib)
+endif (WIN32)
 
 include_directories(
     ${GENERATED_JAVAH}
@@ -87,6 +117,7 @@ include_directories(
     ${JNI_INCLUDE_DIRS}
     main/native
     main/native/libhdfs
+    ${OS_DIR}
 )
 
 set(_FUSE_DFS_VERSION 0.1.0)
@@ -96,6 +127,9 @@ add_dual_library(hdfs
     main/native/libhdfs/exception.c
     main/native/libhdfs/jni_helper.c
     main/native/libhdfs/hdfs.c
+    main/native/libhdfs/common/htable.c
+    ${OS_DIR}/mutexes.c
+    ${OS_DIR}/thread_local_storage.c
 )
 if (NEED_LINK_DL)
    set(LIB_DL dl)
@@ -104,17 +138,14 @@ endif(NEED_LINK_DL)
 target_link_dual_libraries(hdfs
     ${JAVA_JVM_LIBRARY}
     ${LIB_DL}
-    pthread
+    ${OS_LINK_LIBRARIES}
 )
-dual_output_directory(hdfs target/usr/local/lib)
+
+dual_output_directory(hdfs ${OUT_DIR})
 set(LIBHDFS_VERSION "0.0.0")
 set_target_properties(hdfs PROPERTIES
     SOVERSION ${LIBHDFS_VERSION})
 
-add_library(posix_util
-    main/native/util/posix_util.c
-)
-
 add_executable(test_libhdfs_ops
     main/native/libhdfs/test/test_libhdfs_ops.c
 )
@@ -156,11 +187,12 @@ target_link_libraries(test_native_mini_dfs
 add_executable(test_libhdfs_threaded
     main/native/libhdfs/expect.c
     main/native/libhdfs/test_libhdfs_threaded.c
+    ${OS_DIR}/thread.c
 )
 target_link_libraries(test_libhdfs_threaded
     hdfs
     native_mini_dfs
-    pthread
+    ${OS_LINK_LIBRARIES}
 )
 
 add_executable(test_libhdfs_zerocopy
@@ -170,17 +202,21 @@ add_executable(test_libhdfs_zerocopy
 target_link_libraries(test_libhdfs_zerocopy
     hdfs
     native_mini_dfs
-    pthread
+    ${OS_LINK_LIBRARIES}
 )
 
-add_executable(test_libhdfs_vecsum
-    main/native/libhdfs/test/vecsum.c
-)
-target_link_libraries(test_libhdfs_vecsum
-    hdfs
-    pthread
-    rt
-)
+# Skip vecsum on Windows.  This could be made to work in the future by
+# introducing an abstraction layer over the sys/mman.h functions.
+if (NOT WIN32)
+    add_executable(test_libhdfs_vecsum
+        main/native/libhdfs/test/vecsum.c
+    )
+    target_link_libraries(test_libhdfs_vecsum
+        hdfs
+        pthread
+        rt
+    )
+endif(NOT WIN32)
 
 IF(REQUIRE_LIBWEBHDFS)
     add_subdirectory(contrib/libwebhdfs)

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSUtil.java

@@ -1671,9 +1671,11 @@ public class DFSUtil {
         .setKeytabConfKey(getSpnegoKeytabKey(conf, spnegoKeytabFileKey));
 
     // initialize the webserver for uploading/downloading files.
-    LOG.info("Starting web server as: "
-        + SecurityUtil.getServerPrincipal(conf.get(spnegoUserNameKey),
-            httpAddr.getHostName()));
+    if (UserGroupInformation.isSecurityEnabled()) {
+      LOG.info("Starting web server as: "
+          + SecurityUtil.getServerPrincipal(conf.get(spnegoUserNameKey),
+              httpAddr.getHostName()));
+    }
 
     if (policy.isHttpEnabled()) {
       if (httpAddr.getPort() == 0) {

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/balancer/ExitStatus.java

@@ -1,4 +1,4 @@
-/*
+/**
  * Licensed to the Apache Software Foundation (ASF) under one
  * or more contributor license agreements.  See the NOTICE file
  * distributed with this work for additional information
@@ -15,25 +15,30 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+package org.apache.hadoop.hdfs.server.balancer;
 
-package org.apache.hadoop.yarn.server.resourcemanager.rmapp.attempt.event;
+/**
+ * Exit status - The values associated with each exit status is directly mapped
+ * to the process's exit code in command line.
+ */
+public enum ExitStatus {
+  SUCCESS(0),
+  IN_PROGRESS(1),
+  ALREADY_RUNNING(-1),
+  NO_MOVE_BLOCK(-2),
+  NO_MOVE_PROGRESS(-3),
+  IO_EXCEPTION(-4),
+  ILLEGAL_ARGUMENTS(-5),
+  INTERRUPTED(-6);
 
-import org.apache.hadoop.yarn.api.records.ApplicationAttemptId;
-import org.apache.hadoop.yarn.server.resourcemanager.rmapp.attempt.RMAppAttemptEvent;
-import org.apache.hadoop.yarn.server.resourcemanager.rmapp.attempt.RMAppAttemptEventType;
+  private final int code;
 
-public class RMAppAttemptNewSavedEvent extends RMAppAttemptEvent {
-
-  final Exception storedException;
-  
-  public RMAppAttemptNewSavedEvent(ApplicationAttemptId appAttemptId,
-                                 Exception storedException) {
-    super(appAttemptId, RMAppAttemptEventType.ATTEMPT_NEW_SAVED);
-    this.storedException = storedException;
+  private ExitStatus(int code) {
+    this.code = code;
   }
   
-  public Exception getStoredException() {
-    return storedException;
+  /** @return the command line exit code. */
+  public int getExitCode() {
+    return code;
   }
-
 }

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/balancer/NameNodeConnector.java

@@ -34,6 +34,10 @@ import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.hdfs.NameNodeProxies;
 import org.apache.hadoop.hdfs.protocol.AlreadyBeingCreatedException;
 import org.apache.hadoop.hdfs.protocol.ClientProtocol;
+import org.apache.hadoop.hdfs.protocol.DatanodeInfo;
+import org.apache.hadoop.hdfs.protocol.HdfsConstants.DatanodeReportType;
+import org.apache.hadoop.hdfs.server.protocol.BlocksWithLocations;
+import org.apache.hadoop.hdfs.server.protocol.DatanodeStorageReport;
 import org.apache.hadoop.hdfs.server.protocol.NamenodeProtocol;
 import org.apache.hadoop.hdfs.server.protocol.NamespaceInfo;
 import org.apache.hadoop.io.IOUtils;
@@ -90,14 +94,16 @@ public class NameNodeConnector implements Closeable {
     return blockpoolID;
   }
 
-  /** @return the namenode proxy. */
-  public NamenodeProtocol getNamenode() {
-    return namenode;
+  /** @return blocks with locations. */
+  public BlocksWithLocations getBlocks(DatanodeInfo datanode, long size)
+      throws IOException {
+    return namenode.getBlocks(datanode, size);
   }
 
-  /** @return the client proxy. */
-  public ClientProtocol getClient() {
-    return client;
+  /** @return live datanode storage reports. */
+  public DatanodeStorageReport[] getLiveDatanodeStorageReport()
+      throws IOException {
+    return client.getDatanodeStorageReport(DatanodeReportType.LIVE);
   }
 
   /** @return the key manager */

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/DatanodeManager.java

@@ -136,6 +136,9 @@ public class DatanodeManager {
   /** The number of stale DataNodes */
   private volatile int numStaleNodes;
 
+  /** The number of stale storages */
+  private volatile int numStaleStorages;
+
   /**
    * Whether or not this cluster has ever consisted of more than 1 rack,
    * according to the NetworkTopology.
@@ -1142,6 +1145,22 @@ public class DatanodeManager {
     return this.numStaleNodes;
   }
 
+  /**
+   * Get the number of content stale storages.
+   */
+  public int getNumStaleStorages() {
+    return numStaleStorages;
+  }
+
+  /**
+   * Set the number of content stale storages.
+   *
+   * @param numStaleStorages The number of content stale storages.
+   */
+  void setNumStaleStorages(int numStaleStorages) {
+    this.numStaleStorages = numStaleStorages;
+  }
+
   /** Fetch live and dead datanodes. */
   public void fetchDatanodes(final List<DatanodeDescriptor> live, 
       final List<DatanodeDescriptor> dead, final boolean removeDecommissionNode) {

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/HeartbeatManager.java

@@ -256,6 +256,7 @@ class HeartbeatManager implements DatanodeStatistics {
       DatanodeID dead = null;
       // check the number of stale nodes
       int numOfStaleNodes = 0;
+      int numOfStaleStorages = 0;
       synchronized(this) {
         for (DatanodeDescriptor d : datanodes) {
           if (dead == null && dm.isDatanodeDead(d)) {
@@ -265,10 +266,17 @@ class HeartbeatManager implements DatanodeStatistics {
           if (d.isStale(dm.getStaleInterval())) {
             numOfStaleNodes++;
           }
+          DatanodeStorageInfo[] storageInfos = d.getStorageInfos();
+          for(DatanodeStorageInfo storageInfo : storageInfos) {
+            if (storageInfo.areBlockContentsStale()) {
+              numOfStaleStorages++;
+            }
+          }
         }
         
         // Set the number of stale nodes in the DatanodeManager
         dm.setNumStaleNodes(numOfStaleNodes);
+        dm.setNumStaleStorages(numOfStaleStorages);
       }
 
       allAlive = dead == null;

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/BPOfferService.java

@@ -601,7 +601,7 @@ class BPOfferService {
       LOG.info("DatanodeCommand action : DNA_REGISTER from " + actor.nnAddr
           + " with " + actor.state + " state");
       actor.reRegister();
-      return true;
+      return false;
     }
     writeLock();
     try {

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/BPServiceActor.java

@@ -223,6 +223,18 @@ class BPServiceActor implements Runnable {
     register();
   }
 
+  // This is useful to make sure NN gets Heartbeat before Blockreport
+  // upon NN restart while DN keeps retrying Otherwise,
+  // 1. NN restarts.
+  // 2. Heartbeat RPC will retry and succeed. NN asks DN to reregister.
+  // 3. After reregistration completes, DN will send Blockreport first.
+  // 4. Given NN receives Blockreport after Heartbeat, it won't mark
+  //    DatanodeStorageInfo#blockContentsStale to false until the next
+  //    Blockreport.
+  void scheduleHeartbeat() {
+    lastHeartbeat = 0;
+  }
+
   /**
    * This methods  arranges for the data node to send the block report at 
    * the next heartbeat.
@@ -902,6 +914,7 @@ class BPServiceActor implements Runnable {
       retrieveNamespaceInfo();
       // and re-register
       register();
+      scheduleHeartbeat();
     }
   }
 

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/BlockPoolSliceStorage.java

@@ -36,8 +36,10 @@ import java.io.File;
 import java.io.IOException;
 import java.util.ArrayList;
 import java.util.Collection;
+import java.util.HashSet;
 import java.util.Iterator;
 import java.util.Properties;
+import java.util.Set;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
@@ -106,13 +108,22 @@ public class BlockPoolSliceStorage extends Storage {
   void recoverTransitionRead(DataNode datanode, NamespaceInfo nsInfo,
       Collection<File> dataDirs, StartupOption startOpt) throws IOException {
     LOG.info("Analyzing storage directories for bpid " + nsInfo.getBlockPoolID());
+    Set<String> existingStorageDirs = new HashSet<String>();
+    for (int i = 0; i < getNumStorageDirs(); i++) {
+      existingStorageDirs.add(getStorageDir(i).getRoot().getAbsolutePath());
+    }
+
     // 1. For each BP data directory analyze the state and
     // check whether all is consistent before transitioning.
-    this.storageDirs = new ArrayList<StorageDirectory>(dataDirs.size());
     ArrayList<StorageState> dataDirStates = new ArrayList<StorageState>(
         dataDirs.size());
     for (Iterator<File> it = dataDirs.iterator(); it.hasNext();) {
       File dataDir = it.next();
+      if (existingStorageDirs.contains(dataDir.getAbsolutePath())) {
+        LOG.info("Storage directory " + dataDir + " has already been used.");
+        it.remove();
+        continue;
+      }
       StorageDirectory sd = new StorageDirectory(dataDir, null, true);
       StorageState curState;
       try {

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/DataStorage.java

@@ -55,6 +55,7 @@ import java.util.ArrayList;
 import java.util.Collection;
 import java.util.Collections;
 import java.util.HashMap;
+import java.util.HashSet;
 import java.util.Iterator;
 import java.util.List;
 import java.util.Map;
@@ -171,6 +172,170 @@ public class DataStorage extends Storage {
     return null;
   }
   
+  /**
+   * {{@inheritDoc org.apache.hadoop.hdfs.server.common.Storage#writeAll()}}
+   */
+  private void writeAll(Collection<StorageDirectory> dirs) throws IOException {
+    this.layoutVersion = getServiceLayoutVersion();
+    for (StorageDirectory dir : dirs) {
+      writeProperties(dir);
+    }
+  }
+
+  /**
+   * Add a list of volumes to be managed by DataStorage. If the volume is empty,
+   * format it, otherwise recover it from previous transitions if required.
+   *
+   * @param datanode the reference to DataNode.
+   * @param nsInfo namespace information
+   * @param dataDirs array of data storage directories
+   * @param startOpt startup option
+   * @throws IOException
+   */
+  synchronized void addStorageLocations(DataNode datanode,
+      NamespaceInfo nsInfo, Collection<StorageLocation> dataDirs,
+      StartupOption startOpt)
+      throws IOException {
+    // Similar to recoverTransitionRead, it first ensures the datanode level
+    // format is completed.
+    List<StorageLocation> tmpDataDirs =
+        new ArrayList<StorageLocation>(dataDirs);
+    addStorageLocations(datanode, nsInfo, tmpDataDirs, startOpt, false, true);
+
+    Collection<File> bpDataDirs = new ArrayList<File>();
+    String bpid = nsInfo.getBlockPoolID();
+    for (StorageLocation dir : dataDirs) {
+      File dnRoot = dir.getFile();
+      File bpRoot = BlockPoolSliceStorage.getBpRoot(bpid, new File(dnRoot,
+          STORAGE_DIR_CURRENT));
+      bpDataDirs.add(bpRoot);
+    }
+    // mkdir for the list of BlockPoolStorage
+    makeBlockPoolDataDir(bpDataDirs, null);
+    BlockPoolSliceStorage bpStorage = this.bpStorageMap.get(bpid);
+    if (bpStorage == null) {
+      bpStorage = new BlockPoolSliceStorage(
+          nsInfo.getNamespaceID(), bpid, nsInfo.getCTime(),
+          nsInfo.getClusterID());
+    }
+
+    bpStorage.recoverTransitionRead(datanode, nsInfo, bpDataDirs, startOpt);
+    addBlockPoolStorage(bpid, bpStorage);
+  }
+
+  /**
+   * Add a list of volumes to be managed by this DataStorage. If the volume is
+   * empty, it formats the volume, otherwise it recovers it from previous
+   * transitions if required.
+   *
+   * If isInitialize is false, only the directories that have finished the
+   * doTransition() process will be added into DataStorage.
+   *
+   * @param datanode the reference to DataNode.
+   * @param nsInfo namespace information
+   * @param dataDirs array of data storage directories
+   * @param startOpt startup option
+   * @param isInitialize whether it is called when DataNode starts up.
+   * @throws IOException
+   */
+  private synchronized void addStorageLocations(DataNode datanode,
+      NamespaceInfo nsInfo, Collection<StorageLocation> dataDirs,
+      StartupOption startOpt, boolean isInitialize, boolean ignoreExistingDirs)
+      throws IOException {
+    Set<String> existingStorageDirs = new HashSet<String>();
+    for (int i = 0; i < getNumStorageDirs(); i++) {
+      existingStorageDirs.add(getStorageDir(i).getRoot().getAbsolutePath());
+    }
+
+    // 1. For each data directory calculate its state and check whether all is
+    // consistent before transitioning. Format and recover.
+    ArrayList<StorageState> dataDirStates =
+        new ArrayList<StorageState>(dataDirs.size());
+    List<StorageDirectory> addedStorageDirectories =
+        new ArrayList<StorageDirectory>();
+    for(Iterator<StorageLocation> it = dataDirs.iterator(); it.hasNext();) {
+      File dataDir = it.next().getFile();
+      if (existingStorageDirs.contains(dataDir.getAbsolutePath())) {
+        LOG.info("Storage directory " + dataDir + " has already been used.");
+        it.remove();
+        continue;
+      }
+      StorageDirectory sd = new StorageDirectory(dataDir);
+      StorageState curState;
+      try {
+        curState = sd.analyzeStorage(startOpt, this);
+        // sd is locked but not opened
+        switch (curState) {
+        case NORMAL:
+          break;
+        case NON_EXISTENT:
+          // ignore this storage
+          LOG.info("Storage directory " + dataDir + " does not exist");
+          it.remove();
+          continue;
+        case NOT_FORMATTED: // format
+          LOG.info("Storage directory " + dataDir + " is not formatted for "
+            + nsInfo.getBlockPoolID());
+          LOG.info("Formatting ...");
+          format(sd, nsInfo, datanode.getDatanodeUuid());
+          break;
+        default:  // recovery part is common
+          sd.doRecover(curState);
+        }
+      } catch (IOException ioe) {
+        sd.unlock();
+        LOG.warn("Ignoring storage directory " + dataDir
+            + " due to an exception", ioe);
+        //continue with other good dirs
+        continue;
+      }
+      if (isInitialize) {
+        addStorageDir(sd);
+      }
+      addedStorageDirectories.add(sd);
+      dataDirStates.add(curState);
+    }
+
+    if (dataDirs.size() == 0 || dataDirStates.size() == 0) {
+      // none of the data dirs exist
+      if (ignoreExistingDirs) {
+        return;
+      }
+      throw new IOException(
+          "All specified directories are not accessible or do not exist.");
+    }
+
+    // 2. Do transitions
+    // Each storage directory is treated individually.
+    // During startup some of them can upgrade or rollback
+    // while others could be up-to-date for the regular startup.
+    for (Iterator<StorageDirectory> it = addedStorageDirectories.iterator();
+        it.hasNext(); ) {
+      StorageDirectory sd = it.next();
+      try {
+        doTransition(datanode, sd, nsInfo, startOpt);
+        createStorageID(sd);
+      } catch (IOException e) {
+        if (!isInitialize) {
+          sd.unlock();
+          it.remove();
+          continue;
+        }
+        unlockAll();
+        throw e;
+      }
+    }
+
+    // 3. Update all successfully loaded storages. Some of them might have just
+    // been formatted.
+    this.writeAll(addedStorageDirectories);
+
+    // 4. Make newly loaded storage directories visible for service.
+    if (!isInitialize) {
+      this.storageDirs.addAll(addedStorageDirectories);
+    }
+  }
+
   /**
    * Analyze storage directories.
    * Recover from previous transitions if required.
@@ -193,71 +358,13 @@ public class DataStorage extends Storage {
       // DN storage has been initialized, no need to do anything
       return;
     }
-    LOG.info("Data-node version: " + HdfsConstants.DATANODE_LAYOUT_VERSION
-        + " and name-node layout version: " + nsInfo.getLayoutVersion());
+    LOG.info("DataNode version: " + HdfsConstants.DATANODE_LAYOUT_VERSION
+        + " and NameNode layout version: " + nsInfo.getLayoutVersion());
 
-    // 1. For each data directory calculate its state and 
-    // check whether all is consistent before transitioning.
-    // Format and recover.
     this.storageDirs = new ArrayList<StorageDirectory>(dataDirs.size());
-    ArrayList<StorageState> dataDirStates = new ArrayList<StorageState>(dataDirs.size());
-    for(Iterator<StorageLocation> it = dataDirs.iterator(); it.hasNext();) {
-      File dataDir = it.next().getFile();
-      StorageDirectory sd = new StorageDirectory(dataDir);
-      StorageState curState;
-      try {
-        curState = sd.analyzeStorage(startOpt, this);
-        // sd is locked but not opened
-        switch(curState) {
-        case NORMAL:
-          break;
-        case NON_EXISTENT:
-          // ignore this storage
-          LOG.info("Storage directory " + dataDir + " does not exist");
-          it.remove();
-          continue;
-        case NOT_FORMATTED: // format
-          LOG.info("Storage directory " + dataDir + " is not formatted");
-          LOG.info("Formatting ...");
-          format(sd, nsInfo, datanode.getDatanodeUuid());
-          break;
-        default:  // recovery part is common
-          sd.doRecover(curState);
-        }
-      } catch (IOException ioe) {
-        sd.unlock();
-        LOG.warn("Ignoring storage directory " + dataDir
-            + " due to an exception", ioe);
-        //continue with other good dirs
-        continue;
-      }
-      // add to the storage list
-      addStorageDir(sd);
-      dataDirStates.add(curState);
-    }
+    addStorageLocations(datanode, nsInfo, dataDirs, startOpt, true, false);
     
-    if (dataDirs.size() == 0 || dataDirStates.size() == 0)  // none of the data dirs exist
-      throw new IOException(
-          "All specified directories are not accessible or do not exist.");
-
-    // 2. Do transitions
-    // Each storage directory is treated individually.
-    // During startup some of them can upgrade or rollback 
-    // while others could be uptodate for the regular startup.
-    try {
-      for (int idx = 0; idx < getNumStorageDirs(); idx++) {
-        doTransition(datanode, getStorageDir(idx), nsInfo, startOpt);
-        createStorageID(getStorageDir(idx));
-      }
-    } catch (IOException e) {
-      unlockAll();
-      throw e;
-    }
-
-    // 3. Update all storages. Some of them might have just been formatted.
-    this.writeAll();
-    
-    // 4. mark DN storage is initialized
+    // mark DN storage is initialized
     this.initialized = true;
   }
 

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/StorageLocation.java

@@ -78,7 +78,7 @@ public class StorageLocation {
    * @return A StorageLocation object if successfully parsed, null otherwise.
    *         Does not throw any exceptions.
    */
-  static StorageLocation parse(String rawLocation)
+  public static StorageLocation parse(String rawLocation)
       throws IOException, SecurityException {
     Matcher matcher = regex.matcher(rawLocation);
     StorageType storageType = StorageType.DEFAULT;

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/FsDatasetSpi.java

@@ -22,6 +22,7 @@ import java.io.File;
 import java.io.FileDescriptor;
 import java.io.IOException;
 import java.io.InputStream;
+import java.util.Collection;
 import java.util.List;
 import java.util.Map;
 
@@ -39,6 +40,7 @@ import org.apache.hadoop.hdfs.server.datanode.DataStorage;
 import org.apache.hadoop.hdfs.server.datanode.FinalizedReplica;
 import org.apache.hadoop.hdfs.server.datanode.Replica;
 import org.apache.hadoop.hdfs.server.datanode.ReplicaInPipelineInterface;
+import org.apache.hadoop.hdfs.server.datanode.StorageLocation;
 import org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetFactory;
 import org.apache.hadoop.hdfs.server.datanode.metrics.FSDatasetMBean;
 import org.apache.hadoop.hdfs.server.protocol.BlockRecoveryCommand.RecoveringBlock;
@@ -91,6 +93,10 @@ public interface FsDatasetSpi<V extends FsVolumeSpi> extends FSDatasetMBean {
   /** @return a list of volumes. */
   public List<V> getVolumes();
 
+  /** Add an array of StorageLocation to FsDataset. */
+  public void addVolumes(Collection<StorageLocation> volumes)
+      throws IOException;
+
   /** @return a storage with the given storage ID */
   public DatanodeStorage getStorage(final String storageUuid);
 

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsDatasetAsyncDiskService.java

@@ -61,6 +61,7 @@ class FsDatasetAsyncDiskService {
   private static final long THREADS_KEEP_ALIVE_SECONDS = 60; 
   
   private final DataNode datanode;
+  private final ThreadGroup threadGroup;
   private Map<File, ThreadPoolExecutor> executors
       = new HashMap<File, ThreadPoolExecutor>();
   
@@ -70,42 +71,52 @@ class FsDatasetAsyncDiskService {
    * 
    * The AsyncDiskServices uses one ThreadPool per volume to do the async
    * disk operations.
-   * 
-   * @param volumes The roots of the data volumes.
    */
-  FsDatasetAsyncDiskService(DataNode datanode, File[] volumes) {
+  FsDatasetAsyncDiskService(DataNode datanode) {
     this.datanode = datanode;
+    this.threadGroup = new ThreadGroup(getClass().getSimpleName());
+  }
 
-    final ThreadGroup threadGroup = new ThreadGroup(getClass().getSimpleName());
-    // Create one ThreadPool per volume
-    for (int v = 0 ; v < volumes.length; v++) {
-      final File vol = volumes[v];
-      ThreadFactory threadFactory = new ThreadFactory() {
-          int counter = 0;
+  private void addExecutorForVolume(final File volume) {
+    ThreadFactory threadFactory = new ThreadFactory() {
+      int counter = 0;
 
-          @Override
-          public Thread newThread(Runnable r) {
-            int thisIndex;
-            synchronized (this) {
-              thisIndex = counter++;
-            }
-            Thread t = new Thread(threadGroup, r);
-            t.setName("Async disk worker #" + thisIndex +
-                      " for volume " + vol);
-            return t;
-          }
-        };
+      @Override
+      public Thread newThread(Runnable r) {
+        int thisIndex;
+        synchronized (this) {
+          thisIndex = counter++;
+        }
+        Thread t = new Thread(threadGroup, r);
+        t.setName("Async disk worker #" + thisIndex +
+            " for volume " + volume);
+        return t;
+      }
+    };
 
-      ThreadPoolExecutor executor = new ThreadPoolExecutor(
-          CORE_THREADS_PER_VOLUME, MAXIMUM_THREADS_PER_VOLUME, 
-          THREADS_KEEP_ALIVE_SECONDS, TimeUnit.SECONDS, 
-          new LinkedBlockingQueue<Runnable>(), threadFactory);
+    ThreadPoolExecutor executor = new ThreadPoolExecutor(
+        CORE_THREADS_PER_VOLUME, MAXIMUM_THREADS_PER_VOLUME,
+        THREADS_KEEP_ALIVE_SECONDS, TimeUnit.SECONDS,
+        new LinkedBlockingQueue<Runnable>(), threadFactory);
 
-      // This can reduce the number of running threads
-      executor.allowCoreThreadTimeOut(true);
-      executors.put(vol, executor);
+    // This can reduce the number of running threads
+    executor.allowCoreThreadTimeOut(true);
+    executors.put(volume, executor);
+  }
+
+  /**
+   * Starts AsyncDiskService for a new volume
+   * @param volume the root of the new data volume.
+   */
+  synchronized void addVolume(File volume) {
+    if (executors == null) {
+      throw new RuntimeException("AsyncDiskService is already shutdown");
     }
-    
+    ThreadPoolExecutor executor = executors.get(volume);
+    if (executor != null) {
+      throw new RuntimeException("Volume " + volume + " is already existed.");
+    }
+    addExecutorForVolume(volume);
   }
   
   synchronized long countPendingDeletions() {

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsDatasetImpl.java

@@ -202,6 +202,7 @@ class FsDatasetImpl implements FsDatasetSpi<FsVolumeImpl> {
   final Map<String, DatanodeStorage> storageMap;
   final FsDatasetAsyncDiskService asyncDiskService;
   final FsDatasetCache cacheManager;
+  private final Configuration conf;
   private final int validVolsRequired;
 
   final ReplicaMap volumeMap;
@@ -216,6 +217,7 @@ class FsDatasetImpl implements FsDatasetSpi<FsVolumeImpl> {
       ) throws IOException {
     this.datanode = datanode;
     this.dataStorage = storage;
+    this.conf = conf;
     // The number of volumes required for operation is the total number 
     // of volumes minus the number of failed volumes we can tolerate.
     final int volFailuresTolerated =
@@ -242,38 +244,76 @@ class FsDatasetImpl implements FsDatasetSpi<FsVolumeImpl> {
     }
 
     storageMap = new HashMap<String, DatanodeStorage>();
-    final List<FsVolumeImpl> volArray = new ArrayList<FsVolumeImpl>(
-        storage.getNumStorageDirs());
-    for (int idx = 0; idx < storage.getNumStorageDirs(); idx++) {
-      Storage.StorageDirectory sd = storage.getStorageDir(idx);
-      final File dir = sd.getCurrentDir();
-      final StorageType storageType = getStorageTypeFromLocations(dataLocations, sd.getRoot());
-      volArray.add(new FsVolumeImpl(this, sd.getStorageUuid(), dir, conf,
-          storageType));
-      LOG.info("Added volume - " + dir + ", StorageType: " + storageType);
-      storageMap.put(sd.getStorageUuid(),
-          new DatanodeStorage(sd.getStorageUuid(), DatanodeStorage.State.NORMAL, storageType));
-    }
     volumeMap = new ReplicaMap(this);
-
     @SuppressWarnings("unchecked")
     final VolumeChoosingPolicy<FsVolumeImpl> blockChooserImpl =
         ReflectionUtils.newInstance(conf.getClass(
             DFSConfigKeys.DFS_DATANODE_FSDATASET_VOLUME_CHOOSING_POLICY_KEY,
             RoundRobinVolumeChoosingPolicy.class,
             VolumeChoosingPolicy.class), conf);
-    volumes = new FsVolumeList(volArray, volsFailed, blockChooserImpl);
-    volumes.initializeReplicaMaps(volumeMap);
+    volumes = new FsVolumeList(volsFailed, blockChooserImpl);
+    asyncDiskService = new FsDatasetAsyncDiskService(datanode);
 
-    File[] roots = new File[storage.getNumStorageDirs()];
     for (int idx = 0; idx < storage.getNumStorageDirs(); idx++) {
-      roots[idx] = storage.getStorageDir(idx).getCurrentDir();
+      addVolume(dataLocations, storage.getStorageDir(idx));
     }
-    asyncDiskService = new FsDatasetAsyncDiskService(datanode, roots);
+
     cacheManager = new FsDatasetCache(this);
     registerMBean(datanode.getDatanodeUuid());
   }
 
+  private void addVolume(Collection<StorageLocation> dataLocations,
+      Storage.StorageDirectory sd) throws IOException {
+    final File dir = sd.getCurrentDir();
+    final StorageType storageType =
+        getStorageTypeFromLocations(dataLocations, sd.getRoot());
+
+    // If IOException raises from FsVolumeImpl() or getVolumeMap(), there is
+    // nothing needed to be rolled back to make various data structures, e.g.,
+    // storageMap and asyncDiskService, consistent.
+    FsVolumeImpl fsVolume = new FsVolumeImpl(
+        this, sd.getStorageUuid(), dir, this.conf, storageType);
+    fsVolume.getVolumeMap(volumeMap);
+
+    volumes.addVolume(fsVolume);
+    storageMap.put(sd.getStorageUuid(),
+        new DatanodeStorage(sd.getStorageUuid(),
+                            DatanodeStorage.State.NORMAL,
+                            storageType));
+    asyncDiskService.addVolume(sd.getCurrentDir());
+
+    LOG.info("Added volume - " + dir + ", StorageType: " + storageType);
+  }
+
+  /**
+   * Add an array of StorageLocation to FsDataset.
+   *
+   * @pre dataStorage must have these volumes.
+   * @param volumes
+   * @throws IOException
+   */
+  @Override
+  public synchronized void addVolumes(Collection<StorageLocation> volumes)
+      throws IOException {
+    final Collection<StorageLocation> dataLocations =
+        DataNode.getStorageLocations(this.conf);
+    Map<String, Storage.StorageDirectory> allStorageDirs =
+        new HashMap<String, Storage.StorageDirectory>();
+    for (int idx = 0; idx < dataStorage.getNumStorageDirs(); idx++) {
+      Storage.StorageDirectory sd = dataStorage.getStorageDir(idx);
+      allStorageDirs.put(sd.getRoot().getAbsolutePath(), sd);
+    }
+
+    for (StorageLocation vol : volumes) {
+      String key = vol.getFile().getAbsolutePath();
+      if (!allStorageDirs.containsKey(key)) {
+        LOG.warn("Attempt to add an invalid volume: " + vol.getFile());
+      } else {
+        addVolume(dataLocations, allStorageDirs.get(key));
+      }
+    }
+  }
+
   private StorageType getStorageTypeFromLocations(
       Collection<StorageLocation> dataLocations, File dir) {
     for (StorageLocation dataLocation : dataLocations) {

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsVolumeList.java

@@ -40,9 +40,8 @@ class FsVolumeList {
   private final VolumeChoosingPolicy<FsVolumeImpl> blockChooser;
   private volatile int numFailedVolumes;
 
-  FsVolumeList(List<FsVolumeImpl> volumes, int failedVols,
+  FsVolumeList(int failedVols,
       VolumeChoosingPolicy<FsVolumeImpl> blockChooser) {
-    this.volumes = Collections.unmodifiableList(volumes);
     this.blockChooser = blockChooser;
     this.numFailedVolumes = failedVols;
   }
@@ -102,12 +101,6 @@ class FsVolumeList {
     return remaining;
   }
   
-  void initializeReplicaMaps(ReplicaMap globalReplicaMap) throws IOException {
-    for (FsVolumeImpl v : volumes) {
-      v.getVolumeMap(globalReplicaMap);
-    }
-  }
-  
   void getAllVolumesMap(final String bpid, final ReplicaMap volumeMap) throws IOException {
     long totalStartTime = Time.monotonicNow();
     final List<IOException> exceptions = Collections.synchronizedList(
@@ -205,6 +198,19 @@ class FsVolumeList {
     return volumes.toString();
   }
 
+  /**
+   * Dynamically add new volumes to the existing volumes that this DN manages.
+   * @param newVolume the instance of new FsVolumeImpl.
+   */
+  synchronized void addVolume(FsVolumeImpl newVolume) {
+    // Make a copy of volumes to add new volumes.
+    final List<FsVolumeImpl> volumeList = volumes == null ?
+        new ArrayList<FsVolumeImpl>() :
+        new ArrayList<FsVolumeImpl>(volumes);
+    volumeList.add(newVolume);
+    volumes = Collections.unmodifiableList(volumeList);
+    FsDatasetImpl.LOG.info("Added new volume: " + newVolume.toString());
+  }
 
   void addBlockPool(final String bpid, final Configuration conf) throws IOException {
     long totalStartTime = Time.monotonicNow();

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSDirectory.java

@@ -786,8 +786,6 @@ public class FSDirectory implements Closeable {
     checkSnapshot(srcInode, null);
   }
 
-
-
   private class RenameOperation {
     private final INodesInPath srcIIP;
     private final INodesInPath dstIIP;
@@ -820,7 +818,7 @@ public class FSDirectory implements Closeable {
       // snapshot is taken on the dst tree, changes will be recorded in the latest
       // snapshot of the src tree.
       if (isSrcInSnapshot) {
-        srcChild = srcChild.recordModification(srcIIP.getLatestSnapshotId());
+        srcChild.recordModification(srcIIP.getLatestSnapshotId());
       }
 
       // check srcChild for reference
@@ -950,8 +948,7 @@ public class FSDirectory implements Closeable {
       updateCount(iip, 0, dsDelta, true);
     }
 
-    file = file.setFileReplication(replication, iip.getLatestSnapshotId(),
-        inodeMap);
+    file.setFileReplication(replication, iip.getLatestSnapshotId());
     
     final short newBR = file.getBlockReplication(); 
     // check newBR < oldBR case. 
@@ -1234,8 +1231,7 @@ public class FSDirectory implements Closeable {
 
     // record modification
     final int latestSnapshot = iip.getLatestSnapshotId();
-    targetNode = targetNode.recordModification(latestSnapshot);
-    iip.setLastINode(targetNode);
+    targetNode.recordModification(latestSnapshot);
 
     // Remove the node from the namespace
     long removed = removeLastINode(iip);
@@ -2161,7 +2157,7 @@ public class FSDirectory implements Closeable {
       }
 
       final int latest = iip.getLatestSnapshotId();
-      dirNode = dirNode.recordModification(latest);
+      dirNode.recordModification(latest);
       dirNode.setQuota(nsQuota, dsQuota);
       return dirNode;
     }

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java

@@ -2733,7 +2733,7 @@ public class FSNamesystem implements Namesystem, FSClusterStats,
                                    boolean writeToEditLog,
                                    int latestSnapshot, boolean logRetryCache)
       throws IOException {
-    file = file.recordModification(latestSnapshot);
+    file.recordModification(latestSnapshot);
     final INodeFile cons = file.toUnderConstruction(leaseHolder, clientMachine);
 
     leaseManager.addLease(cons.getFileUnderConstructionFeature()
@@ -4441,7 +4441,7 @@ public class FSNamesystem implements Namesystem, FSClusterStats,
     Preconditions.checkArgument(uc != null);
     leaseManager.removeLease(uc.getClientName(), src);
     
-    pendingFile = pendingFile.recordModification(latestSnapshot);
+    pendingFile.recordModification(latestSnapshot);
 
     // The file is no longer pending.
     // Create permanent INode, update blocks. No need to replace the inode here
@@ -6342,7 +6342,6 @@ public class FSNamesystem implements Namesystem, FSClusterStats,
     }
   }
 
-
   @Override // FSNamesystemMBean
   public int getNumLiveDataNodes() {
     return getBlockManager().getDatanodeManager().getNumLiveDataNodes();
@@ -6388,6 +6387,15 @@ public class FSNamesystem implements Namesystem, FSClusterStats,
     return getBlockManager().getDatanodeManager().getNumStaleNodes();
   }
 
+  /**
+   * Storages are marked as "content stale" after NN restart or fails over and
+   * before NN receives the first Heartbeat followed by the first Blockreport.
+   */
+  @Override // FSNamesystemMBean
+  public int getNumStaleStorages() {
+    return getBlockManager().getDatanodeManager().getNumStaleStorages();
+  }
+
   /**
    * Sets the current generation stamp for legacy blocks
    */

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/INode.java

@@ -97,9 +97,9 @@ public abstract class INode implements INodeAttributes, Diff.Element<byte[]> {
   /** Set user */
   final INode setUser(String user, int latestSnapshotId)
       throws QuotaExceededException {
-    final INode nodeToUpdate = recordModification(latestSnapshotId);
-    nodeToUpdate.setUser(user);
-    return nodeToUpdate;
+    recordModification(latestSnapshotId);
+    setUser(user);
+    return this;
   }
   /**
    * @param snapshotId
@@ -122,9 +122,9 @@ public abstract class INode implements INodeAttributes, Diff.Element<byte[]> {
   /** Set group */
   final INode setGroup(String group, int latestSnapshotId)
       throws QuotaExceededException {
-    final INode nodeToUpdate = recordModification(latestSnapshotId);
-    nodeToUpdate.setGroup(group);
-    return nodeToUpdate;
+    recordModification(latestSnapshotId);
+    setGroup(group);
+    return this;
   }
 
   /**
@@ -148,9 +148,9 @@ public abstract class INode implements INodeAttributes, Diff.Element<byte[]> {
   /** Set the {@link FsPermission} of this {@link INode} */
   INode setPermission(FsPermission permission, int latestSnapshotId) 
       throws QuotaExceededException {
-    final INode nodeToUpdate = recordModification(latestSnapshotId);
-    nodeToUpdate.setPermission(permission);
-    return nodeToUpdate;
+    recordModification(latestSnapshotId);
+    setPermission(permission);
+    return this;
   }
 
   abstract AclFeature getAclFeature(int snapshotId);
@@ -164,18 +164,18 @@ public abstract class INode implements INodeAttributes, Diff.Element<byte[]> {
 
   final INode addAclFeature(AclFeature aclFeature, int latestSnapshotId)
       throws QuotaExceededException {
-    final INode nodeToUpdate = recordModification(latestSnapshotId);
-    nodeToUpdate.addAclFeature(aclFeature);
-    return nodeToUpdate;
+    recordModification(latestSnapshotId);
+    addAclFeature(aclFeature);
+    return this;
   }
 
   abstract void removeAclFeature();
 
   final INode removeAclFeature(int latestSnapshotId)
       throws QuotaExceededException {
-    final INode nodeToUpdate = recordModification(latestSnapshotId);
-    nodeToUpdate.removeAclFeature();
-    return nodeToUpdate;
+    recordModification(latestSnapshotId);
+    removeAclFeature();
+    return this;
   }
 
   /**
@@ -199,9 +199,9 @@ public abstract class INode implements INodeAttributes, Diff.Element<byte[]> {
   
   final INode addXAttrFeature(XAttrFeature xAttrFeature, int latestSnapshotId) 
       throws QuotaExceededException {
-    final INode nodeToUpdate = recordModification(latestSnapshotId);
-    nodeToUpdate.addXAttrFeature(xAttrFeature);
-    return nodeToUpdate;
+    recordModification(latestSnapshotId);
+    addXAttrFeature(xAttrFeature);
+    return this;
   }
   
   /**
@@ -211,9 +211,9 @@ public abstract class INode implements INodeAttributes, Diff.Element<byte[]> {
   
   final INode removeXAttrFeature(int lastestSnapshotId)
       throws QuotaExceededException {
-    final INode nodeToUpdate = recordModification(lastestSnapshotId);
-    nodeToUpdate.removeXAttrFeature();
-    return nodeToUpdate;
+    recordModification(lastestSnapshotId);
+    removeXAttrFeature();
+    return this;
   }
   
   /**
@@ -298,11 +298,8 @@ public abstract class INode implements INodeAttributes, Diff.Element<byte[]> {
    * @param latestSnapshotId The id of the latest snapshot that has been taken.
    *                         Note that it is {@link Snapshot#CURRENT_STATE_ID} 
    *                         if no snapshots have been taken.
-   * @return The current inode, which usually is the same object of this inode.
-   *         However, in some cases, this inode may be replaced with a new inode
-   *         for maintaining snapshots. The current inode is then the new inode.
    */
-  abstract INode recordModification(final int latestSnapshotId)
+  abstract void recordModification(final int latestSnapshotId)
       throws QuotaExceededException;
 
   /** Check whether it's a reference. */
@@ -652,9 +649,9 @@ public abstract class INode implements INodeAttributes, Diff.Element<byte[]> {
   /** Set the last modification time of inode. */
   public final INode setModificationTime(long modificationTime,
       int latestSnapshotId) throws QuotaExceededException {
-    final INode nodeToUpdate = recordModification(latestSnapshotId);
-    nodeToUpdate.setModificationTime(modificationTime);
-    return nodeToUpdate;
+    recordModification(latestSnapshotId);
+    setModificationTime(modificationTime);
+    return this;
   }
 
   /**
@@ -682,9 +679,9 @@ public abstract class INode implements INodeAttributes, Diff.Element<byte[]> {
    */
   public final INode setAccessTime(long accessTime, int latestSnapshotId)
       throws QuotaExceededException {
-    final INode nodeToUpdate = recordModification(latestSnapshotId);
-    nodeToUpdate.setAccessTime(accessTime);
-    return nodeToUpdate;
+    recordModification(latestSnapshotId);
+    setAccessTime(accessTime);
+    return this;
   }
 
 

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/INodeDirectory.java

@@ -318,7 +318,7 @@ public class INodeDirectory extends INodeWithAdditionalFields
   }
 
   @Override
-  public INodeDirectory recordModification(int latestSnapshotId) 
+  public void recordModification(int latestSnapshotId)
       throws QuotaExceededException {
     if (isInLatestSnapshot(latestSnapshotId)
         && !shouldRecordInSrcSnapshot(latestSnapshotId)) {
@@ -330,7 +330,6 @@ public class INodeDirectory extends INodeWithAdditionalFields
       // record self in the diff list if necessary
       sf.getDiffs().saveSelf2Snapshot(latestSnapshotId, this, null);
     }
-    return this;
   }
 
   /**

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/INodeFile.java

@@ -284,7 +284,7 @@ public class INodeFile extends INodeWithAdditionalFields
   }
 
   @Override
-  public INodeFile recordModification(final int latestSnapshotId) 
+  public void recordModification(final int latestSnapshotId)
       throws QuotaExceededException {
     if (isInLatestSnapshot(latestSnapshotId)
         && !shouldRecordInSrcSnapshot(latestSnapshotId)) {
@@ -296,7 +296,6 @@ public class INodeFile extends INodeWithAdditionalFields
       // record self in the diff list if necessary
       sf.getDiffs().saveSelf2Snapshot(latestSnapshotId, this, null);
     }
-    return this;
   }
   
   public FileDiffList getDiffs() {
@@ -344,11 +343,10 @@ public class INodeFile extends INodeWithAdditionalFields
 
   /** Set the replication factor of this file. */
   public final INodeFile setFileReplication(short replication,
-      int latestSnapshotId, final INodeMap inodeMap)
-      throws QuotaExceededException {
-    final INodeFile nodeToUpdate = recordModification(latestSnapshotId);
-    nodeToUpdate.setFileReplication(replication);
-    return nodeToUpdate;
+      int latestSnapshotId) throws QuotaExceededException {
+    recordModification(latestSnapshotId);
+    setFileReplication(replication);
+    return this;
   }
 
   /** @return preferred block size (in bytes) of the file. */

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/INodeMap.java

@@ -93,9 +93,8 @@ public class INodeMap {
         "", "", new FsPermission((short) 0)), 0, 0) {
       
       @Override
-      INode recordModification(int latestSnapshotId)
+      void recordModification(int latestSnapshotId)
           throws QuotaExceededException {
-        return null;
       }
       
       @Override

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/INodeReference.java

@@ -287,11 +287,9 @@ public abstract class INodeReference extends INode {
   }
 
   @Override
-  final INode recordModification(int latestSnapshotId)
+  final void recordModification(int latestSnapshotId)
       throws QuotaExceededException {
     referred.recordModification(latestSnapshotId);
-    // reference is never replaced 
-    return this;
   }
 
   @Override // used by WithCount

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/INodeSymlink.java

@@ -47,12 +47,11 @@ public class INodeSymlink extends INodeWithAdditionalFields {
   }
 
   @Override
-  INode recordModification(int latestSnapshotId) throws QuotaExceededException {
+  void recordModification(int latestSnapshotId) throws QuotaExceededException {
     if (isInLatestSnapshot(latestSnapshotId)) {
       INodeDirectory parent = getParent();
       parent.saveChild2Snapshot(this, latestSnapshotId, new INodeSymlink(this));
     }
-    return this;
   }
 
   /** @return true unconditionally. */

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/metrics/FSNamesystemMBean.java

@@ -151,4 +151,11 @@ public interface FSNamesystemMBean {
    * @return number of blocks pending deletion
    */
   long getPendingDeletionBlocks();
+
+  /**
+   * Number of content stale storages.
+   * @return number of content stale storages
+   */
+  public int getNumStaleStorages();
+
 }

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/protocol/RegisterCommand.java

@@ -22,6 +22,9 @@ import org.apache.hadoop.classification.InterfaceStability;
 
 /**
  * A BlockCommand is an instruction to a datanode to register with the namenode.
+ * This command can't be combined with other commands in the same response.
+ * This is because after the datanode processes RegisterCommand, it will skip
+ * the rest of the DatanodeCommands in the same HeartbeatResponse.
  */
 @InterfaceAudience.Private
 @InterfaceStability.Evolving

hadoop-hdfs-project/hadoop-hdfs/src/main/native/fuse-dfs/CMakeLists.txt

@@ -37,6 +37,10 @@ ELSE (${CMAKE_SYSTEM_NAME} MATCHES "Linux")
 ENDIF (${CMAKE_SYSTEM_NAME} MATCHES "Linux")
 
 IF(FUSE_FOUND)
+    add_library(posix_util
+        ../util/posix_util.c
+    )
+
     add_executable(fuse_dfs
         fuse_dfs.c
         fuse_options.c 

hadoop-hdfs-project/hadoop-hdfs/src/main/native/libhdfs/common/htable.c

@@ -0,0 +1,271 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "common/htable.h"
+
+#include <errno.h>
+#include <inttypes.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+struct htable_pair {
+    void *key;
+    void *val;
+};
+
+/**
+ * A hash table which uses linear probing.
+ */
+struct htable {
+    uint32_t capacity;
+    uint32_t used;
+    htable_hash_fn_t hash_fun;
+    htable_eq_fn_t eq_fun;
+    struct htable_pair *elem;
+};
+
+/**
+ * An internal function for inserting a value into the hash table.
+ *
+ * Note: this function assumes that you have made enough space in the table.
+ *
+ * @param nelem         The new element to insert.
+ * @param capacity      The capacity of the hash table.
+ * @param hash_fun      The hash function to use.
+ * @param key           The key to insert.
+ * @param val           The value to insert.
+ */
+static void htable_insert_internal(struct htable_pair *nelem, 
+        uint32_t capacity, htable_hash_fn_t hash_fun, void *key,
+        void *val)
+{
+    uint32_t i;
+
+    i = hash_fun(key, capacity);
+    while (1) {
+        if (!nelem[i].key) {
+            nelem[i].key = key;
+            nelem[i].val = val;
+            return;
+        }
+        i++;
+        if (i == capacity) {
+            i = 0;
+        }
+    }
+}
+
+static int htable_realloc(struct htable *htable, uint32_t new_capacity)
+{
+    struct htable_pair *nelem;
+    uint32_t i, old_capacity = htable->capacity;
+    htable_hash_fn_t hash_fun = htable->hash_fun;
+
+    nelem = calloc(new_capacity, sizeof(struct htable_pair));
+    if (!nelem) {
+        return ENOMEM;
+    }
+    for (i = 0; i < old_capacity; i++) {
+        struct htable_pair *pair = htable->elem + i;
+        htable_insert_internal(nelem, new_capacity, hash_fun,
+                               pair->key, pair->val);
+    }
+    free(htable->elem);
+    htable->elem = nelem;
+    htable->capacity = new_capacity;
+    return 0;
+}
+
+struct htable *htable_alloc(uint32_t size,
+                htable_hash_fn_t hash_fun, htable_eq_fn_t eq_fun)
+{
+    struct htable *htable;
+
+    htable = calloc(1, sizeof(*htable));
+    if (!htable) {
+        return NULL;
+    }
+    size = (size + 1) >> 1;
+    size = size << 1;
+    if (size < HTABLE_MIN_SIZE) {
+        size = HTABLE_MIN_SIZE;
+    }
+    htable->hash_fun = hash_fun;
+    htable->eq_fun = eq_fun;
+    htable->used = 0;
+    if (htable_realloc(htable, size)) {
+        free(htable);
+        return NULL;
+    }
+    return htable;
+}
+
+void htable_visit(struct htable *htable, visitor_fn_t fun, void *ctx)
+{
+    uint32_t i;
+
+    for (i = 0; i != htable->capacity; ++i) {
+        struct htable_pair *elem = htable->elem + i;
+        if (elem->key) {
+            fun(ctx, elem->key, elem->val);
+        }
+    }
+}
+
+void htable_free(struct htable *htable)
+{
+    if (htable) {
+        free(htable->elem);
+        free(htable);
+    }
+}
+
+int htable_put(struct htable *htable, void *key, void *val)
+{
+    int ret;
+    uint32_t nused;
+
+    // NULL is not a valid key value.
+    // This helps us implement htable_get_internal efficiently, since we know
+    // that we can stop when we encounter the first NULL key.
+    if (!key) {
+        return EINVAL;
+    }
+    // NULL is not a valid value.  Otherwise the results of htable_get would
+    // be confusing (does a NULL return mean entry not found, or that the
+    // entry was found and was NULL?) 
+    if (!val) {
+        return EINVAL;
+    }
+    // Re-hash if we have used more than half of the hash table
+    nused = htable->used + 1;
+    if (nused >= (htable->capacity / 2)) {
+        ret = htable_realloc(htable, htable->capacity * 2);
+        if (ret)
+            return ret;
+    }
+    htable_insert_internal(htable->elem, htable->capacity,
+                                htable->hash_fun, key, val);
+    htable->used++;
+    return 0;
+}
+
+static int htable_get_internal(const struct htable *htable,
+                               const void *key, uint32_t *out)
+{
+    uint32_t start_idx, idx;
+
+    start_idx = htable->hash_fun(key, htable->capacity);
+    idx = start_idx;
+    while (1) {
+        struct htable_pair *pair = htable->elem + idx;
+        if (!pair->key) {
+            // We always maintain the invariant that the entries corresponding
+            // to a given key are stored in a contiguous block, not separated
+            // by any NULLs.  So if we encounter a NULL, our search is over.
+            return ENOENT;
+        } else if (htable->eq_fun(pair->key, key)) {
+            *out = idx;
+            return 0;
+        }
+        idx++;
+        if (idx == htable->capacity) {
+            idx = 0;
+        }
+        if (idx == start_idx) {
+            return ENOENT;
+        }
+    }
+}
+
+void *htable_get(const struct htable *htable, const void *key)
+{
+    uint32_t idx;
+
+    if (htable_get_internal(htable, key, &idx)) {
+        return NULL;
+    }
+    return htable->elem[idx].val;
+}
+
+void htable_pop(struct htable *htable, const void *key,
+                void **found_key, void **found_val)
+{
+    uint32_t hole, i;
+    const void *nkey;
+
+    if (htable_get_internal(htable, key, &hole)) {
+        *found_key = NULL;
+        *found_val = NULL;
+        return;
+    }
+    i = hole;
+    htable->used--;
+    // We need to maintain the compactness invariant used in
+    // htable_get_internal.  This invariant specifies that the entries for any
+    // given key are never separated by NULLs (although they may be separated
+    // by entries for other keys.)
+    while (1) {
+        i++;
+        if (i == htable->capacity) {
+            i = 0;
+        }
+        nkey = htable->elem[i].key;
+        if (!nkey) {
+            *found_key = htable->elem[hole].key;
+            *found_val = htable->elem[hole].val;
+            htable->elem[hole].key = NULL;
+            htable->elem[hole].val = NULL;
+            return;
+        } else if (htable->eq_fun(key, nkey)) {
+            htable->elem[hole].key = htable->elem[i].key;
+            htable->elem[hole].val = htable->elem[i].val;
+            hole = i;
+        }
+    }
+}
+
+uint32_t htable_used(const struct htable *htable)
+{
+    return htable->used;
+}
+
+uint32_t htable_capacity(const struct htable *htable)
+{
+    return htable->capacity;
+}
+
+uint32_t ht_hash_string(const void *str, uint32_t max)
+{
+    const char *s = str;
+    uint32_t hash = 0;
+
+    while (*s) {
+        hash = (hash * 31) + *s;
+        s++;
+    }
+    return hash % max;
+}
+
+int ht_compare_string(const void *a, const void *b)
+{
+    return strcmp(a, b) == 0;
+}
+
+// vim: ts=4:sw=4:tw=79:et

hadoop-hdfs-project/hadoop-hdfs/src/main/native/libhdfs/common/htable.h

@@ -0,0 +1,161 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef HADOOP_CORE_COMMON_HASH_TABLE
+#define HADOOP_CORE_COMMON_HASH_TABLE
+
+#include <inttypes.h>
+#include <stdio.h>
+#include <stdint.h>
+
+#define HTABLE_MIN_SIZE 4
+
+struct htable;
+
+/**
+ * An HTable hash function.
+ *
+ * @param key       The key.
+ * @param capacity  The total capacity.
+ *
+ * @return          The hash slot.  Must be less than the capacity.
+ */
+typedef uint32_t (*htable_hash_fn_t)(const void *key, uint32_t capacity);
+
+/**
+ * An HTable equality function.  Compares two keys.
+ *
+ * @param a         First key.
+ * @param b         Second key.
+ *
+ * @return          nonzero if the keys are equal.
+ */
+typedef int (*htable_eq_fn_t)(const void *a, const void *b);
+
+/**
+ * Allocate a new hash table.
+ *
+ * @param capacity  The minimum suggested starting capacity.
+ * @param hash_fun  The hash function to use in this hash table.
+ * @param eq_fun    The equals function to use in this hash table.
+ *
+ * @return          The new hash table on success; NULL on OOM.
+ */
+struct htable *htable_alloc(uint32_t capacity, htable_hash_fn_t hash_fun,
+                            htable_eq_fn_t eq_fun);
+
+typedef void (*visitor_fn_t)(void *ctx, void *key, void *val);
+
+/**
+ * Visit all of the entries in the hash table.
+ *
+ * @param htable    The hash table.
+ * @param fun       The callback function to invoke on each key and value.
+ * @param ctx       Context pointer to pass to the callback.
+ */
+void htable_visit(struct htable *htable, visitor_fn_t fun, void *ctx);
+
+/**
+ * Free the hash table.
+ *
+ * It is up the calling code to ensure that the keys and values inside the
+ * table are de-allocated, if that is necessary.
+ *
+ * @param htable    The hash table.
+ */
+void htable_free(struct htable *htable);
+
+/**
+ * Add an entry to the hash table.
+ *
+ * @param htable    The hash table.
+ * @param key       The key to add.  This cannot be NULL.
+ * @param fun       The value to add.  This cannot be NULL.
+ *
+ * @return          0 on success;
+ *                  EEXIST if the value already exists in the table;
+ *                  ENOMEM if there is not enough memory to add the element.
+ *                  EFBIG if the hash table has too many entries to fit in 32
+ *                      bits.
+ */
+int htable_put(struct htable *htable, void *key, void *val);
+
+/**
+ * Get an entry from the hash table.
+ *
+ * @param htable    The hash table.
+ * @param key       The key to find.
+ *
+ * @return          NULL if there is no such entry; the entry otherwise.
+ */
+void *htable_get(const struct htable *htable, const void *key);
+
+/**
+ * Get an entry from the hash table and remove it.
+ *
+ * @param htable    The hash table.
+ * @param key       The key for the entry find and remove.
+ * @param found_key (out param) NULL if the entry was not found; the found key
+ *                      otherwise.
+ * @param found_val (out param) NULL if the entry was not found; the found
+ *                      value otherwise.
+ */
+void htable_pop(struct htable *htable, const void *key,
+                void **found_key, void **found_val);
+
+/**
+ * Get the number of entries used in the hash table.
+ *
+ * @param htable    The hash table.
+ *
+ * @return          The number of entries used in the hash table.
+ */
+uint32_t htable_used(const struct htable *htable);
+
+/**
+ * Get the capacity of the hash table.
+ *
+ * @param htable    The hash table.
+ *
+ * @return          The capacity of the hash table.
+ */
+uint32_t htable_capacity(const struct htable *htable);
+
+/**
+ * Hash a string.
+ *
+ * @param str       The string.
+ * @param max       Maximum hash value
+ *
+ * @return          A number less than max.
+ */
+uint32_t ht_hash_string(const void *str, uint32_t max);
+
+/**
+ * Compare two strings.
+ *
+ * @param a         The first string.
+ * @param b         The second string.
+ *
+ * @return          1 if the strings are identical; 0 otherwise.
+ */
+int ht_compare_string(const void *a, const void *b);
+
+#endif
+
+// vim: ts=4:sw=4:tw=79:et

hadoop-hdfs-project/hadoop-hdfs/src/main/native/libhdfs/exception.c

@@ -19,8 +19,8 @@
 #include "exception.h"
 #include "hdfs.h"
 #include "jni_helper.h"
+#include "platform.h"
 
-#include <inttypes.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -35,54 +35,54 @@ struct ExceptionInfo {
 
 static const struct ExceptionInfo gExceptionInfo[] = {
     {
-        .name = "java.io.FileNotFoundException",
-        .noPrintFlag = NOPRINT_EXC_FILE_NOT_FOUND,
-        .excErrno = ENOENT,
+        "java.io.FileNotFoundException",
+        NOPRINT_EXC_FILE_NOT_FOUND,
+        ENOENT,
     },
     {
-        .name = "org.apache.hadoop.security.AccessControlException",
-        .noPrintFlag = NOPRINT_EXC_ACCESS_CONTROL,
-        .excErrno = EACCES,
+        "org.apache.hadoop.security.AccessControlException",
+        NOPRINT_EXC_ACCESS_CONTROL,
+        EACCES,
     },
     {
-        .name = "org.apache.hadoop.fs.UnresolvedLinkException",
-        .noPrintFlag = NOPRINT_EXC_UNRESOLVED_LINK,
-        .excErrno = ENOLINK,
+        "org.apache.hadoop.fs.UnresolvedLinkException",
+        NOPRINT_EXC_UNRESOLVED_LINK,
+        ENOLINK,
     },
     {
-        .name = "org.apache.hadoop.fs.ParentNotDirectoryException",
-        .noPrintFlag = NOPRINT_EXC_PARENT_NOT_DIRECTORY,
-        .excErrno = ENOTDIR,
+        "org.apache.hadoop.fs.ParentNotDirectoryException",
+        NOPRINT_EXC_PARENT_NOT_DIRECTORY,
+        ENOTDIR,
     },
     {
-        .name = "java.lang.IllegalArgumentException",
-        .noPrintFlag = NOPRINT_EXC_ILLEGAL_ARGUMENT,
-        .excErrno = EINVAL,
+        "java.lang.IllegalArgumentException",
+        NOPRINT_EXC_ILLEGAL_ARGUMENT,
+        EINVAL,
     },
     {
-        .name = "java.lang.OutOfMemoryError",
-        .noPrintFlag = 0,
-        .excErrno = ENOMEM,
+        "java.lang.OutOfMemoryError",
+        0,
+        ENOMEM,
     },
     {
-        .name = "org.apache.hadoop.hdfs.server.namenode.SafeModeException",
-        .noPrintFlag = 0,
-        .excErrno = EROFS,
+        "org.apache.hadoop.hdfs.server.namenode.SafeModeException",
+        0,
+        EROFS,
     },
     {
-        .name = "org.apache.hadoop.fs.FileAlreadyExistsException",
-        .noPrintFlag = 0,
-        .excErrno = EEXIST,
+        "org.apache.hadoop.fs.FileAlreadyExistsException",
+        0,
+        EEXIST,
     },
     {
-        .name = "org.apache.hadoop.hdfs.protocol.QuotaExceededException",
-        .noPrintFlag = 0,
-        .excErrno = EDQUOT,
+        "org.apache.hadoop.hdfs.protocol.QuotaExceededException",
+        0,
+        EDQUOT,
     },
     {
-        .name = "org.apache.hadoop.hdfs.server.namenode.LeaseExpiredException",
-        .noPrintFlag = 0,
-        .excErrno = ESTALE,
+        "org.apache.hadoop.hdfs.server.namenode.LeaseExpiredException",
+        0,
+        ESTALE,
     },
 };
 
@@ -113,6 +113,7 @@ int printExceptionAndFreeV(JNIEnv *env, jthrowable exc, int noPrintFlags,
     jstring jStr = NULL;
     jvalue jVal;
     jthrowable jthr;
+    const char *stackTrace;
 
     jthr = classNameOfObject(exc, env, &className);
     if (jthr) {
@@ -148,7 +149,7 @@ int printExceptionAndFreeV(JNIEnv *env, jthrowable exc, int noPrintFlags,
             destroyLocalReference(env, jthr);
         } else {
             jStr = jVal.l;
-            const char *stackTrace = (*env)->GetStringUTFChars(env, jStr, NULL);
+            stackTrace = (*env)->GetStringUTFChars(env, jStr, NULL);
             if (!stackTrace) {
                 fprintf(stderr, "(unable to get stack trace for %s exception: "
                         "GetStringUTFChars error.)\n", className);

hadoop-hdfs-project/hadoop-hdfs/src/main/native/libhdfs/exception.h

@@ -34,13 +34,14 @@
  * usually not what you want.)
  */
 
+#include "platform.h"
+
 #include <jni.h>
 #include <stdio.h>
 
 #include <stdlib.h>
 #include <stdarg.h>
 #include <search.h>
-#include <pthread.h>
 #include <errno.h>
 
 /**
@@ -109,7 +110,7 @@ int printExceptionAndFreeV(JNIEnv *env, jthrowable exc, int noPrintFlags,
  *                        object.
  */
 int printExceptionAndFree(JNIEnv *env, jthrowable exc, int noPrintFlags,
-        const char *fmt, ...) __attribute__((format(printf, 4, 5)));  
+        const char *fmt, ...) TYPE_CHECKED_PRINTF_FORMAT(4, 5);
 
 /**
  * Print out information about the pending exception and free it.
@@ -124,7 +125,7 @@ int printExceptionAndFree(JNIEnv *env, jthrowable exc, int noPrintFlags,
  *                        object.
  */
 int printPendingExceptionAndFree(JNIEnv *env, int noPrintFlags,
-        const char *fmt, ...) __attribute__((format(printf, 3, 4)));  
+        const char *fmt, ...) TYPE_CHECKED_PRINTF_FORMAT(3, 4);
 
 /**
  * Get a local reference to the pending exception and clear it.
@@ -150,6 +151,7 @@ jthrowable getPendingExceptionAndClear(JNIEnv *env);
  * @return                A local reference to a RuntimeError
  */
 jthrowable newRuntimeError(JNIEnv *env, const char *fmt, ...)
-        __attribute__((format(printf, 2, 3)));
+        TYPE_CHECKED_PRINTF_FORMAT(2, 3);
 
+#undef TYPE_CHECKED_PRINTF_FORMAT
 #endif

hadoop-hdfs-project/hadoop-hdfs/src/main/native/libhdfs/expect.c

@@ -49,18 +49,18 @@ int expectFileStats(hdfsFile file,
             stats->totalShortCircuitBytesRead,
             stats->totalZeroCopyBytesRead);
     if (expectedTotalBytesRead != UINT64_MAX) {
-        EXPECT_INT64_EQ(expectedTotalBytesRead, stats->totalBytesRead);
+        EXPECT_UINT64_EQ(expectedTotalBytesRead, stats->totalBytesRead);
     }
     if (expectedTotalLocalBytesRead != UINT64_MAX) {
-        EXPECT_INT64_EQ(expectedTotalLocalBytesRead,
+        EXPECT_UINT64_EQ(expectedTotalLocalBytesRead,
                       stats->totalLocalBytesRead);
     }
     if (expectedTotalShortCircuitBytesRead != UINT64_MAX) {
-        EXPECT_INT64_EQ(expectedTotalShortCircuitBytesRead,
+        EXPECT_UINT64_EQ(expectedTotalShortCircuitBytesRead,
                       stats->totalShortCircuitBytesRead);
     }
     if (expectedTotalZeroCopyBytesRead != UINT64_MAX) {
-        EXPECT_INT64_EQ(expectedTotalZeroCopyBytesRead,
+        EXPECT_UINT64_EQ(expectedTotalZeroCopyBytesRead,
                       stats->totalZeroCopyBytesRead);
     }
     hdfsFileFreeReadStatistics(stats);

hadoop-hdfs-project/hadoop-hdfs/src/main/native/libhdfs/expect.h

@@ -126,6 +126,18 @@ struct hdfsFile_internal;
         } \
     } while (0);
 
+#define EXPECT_UINT64_EQ(x, y) \
+    do { \
+        uint64_t __my_ret__ = y; \
+        int __my_errno__ = errno; \
+        if (__my_ret__ != (x)) { \
+            fprintf(stderr, "TEST_ERROR: failed on %s:%d with return " \
+              "value %"PRIu64" (errno: %d): expected %"PRIu64"\n", \
+               __FILE__, __LINE__, __my_ret__, __my_errno__, (x)); \
+            return -1; \
+        } \
+    } while (0);
+
 #define RETRY_ON_EINTR_GET_ERRNO(ret, expr) do { \
     ret = expr; \
     if (!ret) \

hadoop-hdfs-project/hadoop-hdfs/src/main/native/libhdfs/jni_helper.c

@@ -19,20 +19,18 @@
 #include "config.h"
 #include "exception.h"
 #include "jni_helper.h"
+#include "platform.h"
+#include "common/htable.h"
+#include "os/mutexes.h"
+#include "os/thread_local_storage.h"
 
 #include <stdio.h> 
 #include <string.h> 
 
-static pthread_mutex_t hdfsHashMutex = PTHREAD_MUTEX_INITIALIZER;
-static pthread_mutex_t jvmMutex = PTHREAD_MUTEX_INITIALIZER;
-static volatile int hashTableInited = 0;
-
-#define LOCK_HASH_TABLE() pthread_mutex_lock(&hdfsHashMutex)
-#define UNLOCK_HASH_TABLE() pthread_mutex_unlock(&hdfsHashMutex)
-
+static struct htable *gClassRefHTable = NULL;
 
 /** The Native return types that methods could return */
-#define VOID          'V'
+#define JVOID         'V'
 #define JOBJECT       'L'
 #define JARRAYOBJECT  '['
 #define JBOOLEAN      'Z'
@@ -51,40 +49,10 @@ static volatile int hashTableInited = 0;
  */
 #define MAX_HASH_TABLE_ELEM 4096
 
-/** Key that allows us to retrieve thread-local storage */
-static pthread_key_t gTlsKey;
-
-/** nonzero if we succeeded in initializing gTlsKey. Protected by the jvmMutex */
-static int gTlsKeyInitialized = 0;
-
-/** Pthreads thread-local storage for each library thread. */
-struct hdfsTls {
-    JNIEnv *env;
-};
-
 /**
- * The function that is called whenever a thread with libhdfs thread local data
- * is destroyed.
- *
- * @param v         The thread-local data
+ * Length of buffer for retrieving created JVMs.  (We only ever create one.)
  */
-static void hdfsThreadDestructor(void *v)
-{
-    struct hdfsTls *tls = v;
-    JavaVM *vm;
-    JNIEnv *env = tls->env;
-    jint ret;
-
-    ret = (*env)->GetJavaVM(env, &vm);
-    if (ret) {
-        fprintf(stderr, "hdfsThreadDestructor: GetJavaVM failed with "
-                "error %d\n", ret);
-        (*env)->ExceptionDescribe(env);
-    } else {
-        (*vm)->DetachCurrentThread(vm);
-    }
-    free(tls);
-}
+#define VM_BUF_LENGTH 1
 
 void destroyLocalReference(JNIEnv *env, jobject jObject)
 {
@@ -138,67 +106,6 @@ jthrowable newCStr(JNIEnv *env, jstring jstr, char **out)
     return NULL;
 }
 
-static int hashTableInit(void)
-{
-    if (!hashTableInited) {
-        LOCK_HASH_TABLE();
-        if (!hashTableInited) {
-            if (hcreate(MAX_HASH_TABLE_ELEM) == 0) {
-                fprintf(stderr, "error creating hashtable, <%d>: %s\n",
-                        errno, strerror(errno));
-                UNLOCK_HASH_TABLE();
-                return 0;
-            } 
-            hashTableInited = 1;
-        }
-        UNLOCK_HASH_TABLE();
-    }
-    return 1;
-}
-
-
-static int insertEntryIntoTable(const char *key, void *data)
-{
-    ENTRY e, *ep;
-    if (key == NULL || data == NULL) {
-        return 0;
-    }
-    if (! hashTableInit()) {
-      return -1;
-    }
-    e.data = data;
-    e.key = (char*)key;
-    LOCK_HASH_TABLE();
-    ep = hsearch(e, ENTER);
-    UNLOCK_HASH_TABLE();
-    if (ep == NULL) {
-        fprintf(stderr, "warn adding key (%s) to hash table, <%d>: %s\n",
-                key, errno, strerror(errno));
-    }  
-    return 0;
-}
-
-
-
-static void* searchEntryFromTable(const char *key)
-{
-    ENTRY e,*ep;
-    if (key == NULL) {
-        return NULL;
-    }
-    hashTableInit();
-    e.key = (char*)key;
-    LOCK_HASH_TABLE();
-    ep = hsearch(e, FIND);
-    UNLOCK_HASH_TABLE();
-    if (ep != NULL) {
-        return ep->data;
-    }
-    return NULL;
-}
-
-
-
 jthrowable invokeMethod(JNIEnv *env, jvalue *retval, MethType methType,
                  jobject instObj, const char *className,
                  const char *methName, const char *methSignature, ...)
@@ -235,7 +142,7 @@ jthrowable invokeMethod(JNIEnv *env, jvalue *retval, MethType methType,
         }
         retval->l = jobj;
     }
-    else if (returnType == VOID) {
+    else if (returnType == JVOID) {
         if (methType == STATIC) {
             (*env)->CallStaticVoidMethodV(env, cls, mid, args);
         }
@@ -325,11 +232,11 @@ jthrowable methodIdFromClass(const char *className, const char *methName,
 {
     jclass cls;
     jthrowable jthr;
+    jmethodID mid = 0;
 
     jthr = globalClassReference(className, env, &cls);
     if (jthr)
         return jthr;
-    jmethodID mid = 0;
     jthr = validateMethodType(env, methType);
     if (jthr)
         return jthr;
@@ -350,25 +257,50 @@ jthrowable methodIdFromClass(const char *className, const char *methName,
 
 jthrowable globalClassReference(const char *className, JNIEnv *env, jclass *out)
 {
-    jclass clsLocalRef;
-    jclass cls = searchEntryFromTable(className);
-    if (cls) {
-        *out = cls;
-        return NULL;
+    jthrowable jthr = NULL;
+    jclass local_clazz = NULL;
+    jclass clazz = NULL;
+    int ret;
+
+    mutexLock(&hdfsHashMutex);
+    if (!gClassRefHTable) {
+        gClassRefHTable = htable_alloc(MAX_HASH_TABLE_ELEM, ht_hash_string,
+            ht_compare_string);
+        if (!gClassRefHTable) {
+            jthr = newRuntimeError(env, "htable_alloc failed\n");
+            goto done;
+        }
     }
-    clsLocalRef = (*env)->FindClass(env,className);
-    if (clsLocalRef == NULL) {
-        return getPendingExceptionAndClear(env);
+    clazz = htable_get(gClassRefHTable, className);
+    if (clazz) {
+        *out = clazz;
+        goto done;
     }
-    cls = (*env)->NewGlobalRef(env, clsLocalRef);
-    if (cls == NULL) {
-        (*env)->DeleteLocalRef(env, clsLocalRef);
-        return getPendingExceptionAndClear(env);
+    local_clazz = (*env)->FindClass(env,className);
+    if (!local_clazz) {
+        jthr = getPendingExceptionAndClear(env);
+        goto done;
     }
-    (*env)->DeleteLocalRef(env, clsLocalRef);
-    insertEntryIntoTable(className, cls);
-    *out = cls;
-    return NULL;
+    clazz = (*env)->NewGlobalRef(env, local_clazz);
+    if (!clazz) {
+        jthr = getPendingExceptionAndClear(env);
+        goto done;
+    }
+    ret = htable_put(gClassRefHTable, (void*)className, clazz);
+    if (ret) {
+        jthr = newRuntimeError(env, "htable_put failed with error "
+                               "code %d\n", ret);
+        goto done;
+    }
+    *out = clazz;
+    jthr = NULL;
+done:
+    mutexUnlock(&hdfsHashMutex);
+    (*env)->DeleteLocalRef(env, local_clazz);
+    if (jthr && clazz) {
+        (*env)->DeleteGlobalRef(env, clazz);
+    }
+    return jthr;
 }
 
 jthrowable classNameOfObject(jobject jobj, JNIEnv *env, char **name)
@@ -436,14 +368,24 @@ done:
  */
 static JNIEnv* getGlobalJNIEnv(void)
 {
-    const jsize vmBufLength = 1;
-    JavaVM* vmBuf[vmBufLength]; 
+    JavaVM* vmBuf[VM_BUF_LENGTH]; 
     JNIEnv *env;
     jint rv = 0; 
     jint noVMs = 0;
     jthrowable jthr;
+    char *hadoopClassPath;
+    const char *hadoopClassPathVMArg = "-Djava.class.path=";
+    size_t optHadoopClassPathLen;
+    char *optHadoopClassPath;
+    int noArgs = 1;
+    char *hadoopJvmArgs;
+    char jvmArgDelims[] = " ";
+    char *str, *token, *savePtr;
+    JavaVMInitArgs vm_args;
+    JavaVM *vm;
+    JavaVMOption *options;
 
-    rv = JNI_GetCreatedJavaVMs(&(vmBuf[0]), vmBufLength, &noVMs);
+    rv = JNI_GetCreatedJavaVMs(&(vmBuf[0]), VM_BUF_LENGTH, &noVMs);
     if (rv != 0) {
         fprintf(stderr, "JNI_GetCreatedJavaVMs failed with error: %d\n", rv);
         return NULL;
@@ -451,23 +393,19 @@ static JNIEnv* getGlobalJNIEnv(void)
 
     if (noVMs == 0) {
         //Get the environment variables for initializing the JVM
-        char *hadoopClassPath = getenv("CLASSPATH");
+        hadoopClassPath = getenv("CLASSPATH");
         if (hadoopClassPath == NULL) {
             fprintf(stderr, "Environment variable CLASSPATH not set!\n");
             return NULL;
         } 
-        char *hadoopClassPathVMArg = "-Djava.class.path=";
-        size_t optHadoopClassPathLen = strlen(hadoopClassPath) + 
+        optHadoopClassPathLen = strlen(hadoopClassPath) + 
           strlen(hadoopClassPathVMArg) + 1;
-        char *optHadoopClassPath = malloc(sizeof(char)*optHadoopClassPathLen);
+        optHadoopClassPath = malloc(sizeof(char)*optHadoopClassPathLen);
         snprintf(optHadoopClassPath, optHadoopClassPathLen,
                 "%s%s", hadoopClassPathVMArg, hadoopClassPath);
 
         // Determine the # of LIBHDFS_OPTS args
-        int noArgs = 1;
-        char *hadoopJvmArgs = getenv("LIBHDFS_OPTS");
-        char jvmArgDelims[] = " ";
-        char *str, *token, *savePtr;
+        hadoopJvmArgs = getenv("LIBHDFS_OPTS");
         if (hadoopJvmArgs != NULL)  {
           hadoopJvmArgs = strdup(hadoopJvmArgs);
           for (noArgs = 1, str = hadoopJvmArgs; ; noArgs++, str = NULL) {
@@ -480,7 +418,12 @@ static JNIEnv* getGlobalJNIEnv(void)
         }
 
         // Now that we know the # args, populate the options array
-        JavaVMOption options[noArgs];
+        options = calloc(noArgs, sizeof(JavaVMOption));
+        if (!options) {
+          fputs("Call to calloc failed\n", stderr);
+          free(optHadoopClassPath);
+          return NULL;
+        }
         options[0].optionString = optHadoopClassPath;
         hadoopJvmArgs = getenv("LIBHDFS_OPTS");
 	if (hadoopJvmArgs != NULL)  {
@@ -495,8 +438,6 @@ static JNIEnv* getGlobalJNIEnv(void)
         }
 
         //Create the VM
-        JavaVMInitArgs vm_args;
-        JavaVM *vm;
         vm_args.version = JNI_VERSION_1_2;
         vm_args.options = options;
         vm_args.nOptions = noArgs; 
@@ -508,6 +449,7 @@ static JNIEnv* getGlobalJNIEnv(void)
           free(hadoopJvmArgs);
         }
         free(optHadoopClassPath);
+        free(options);
 
         if (rv != 0) {
             fprintf(stderr, "Call to JNI_CreateJavaVM failed "
@@ -523,7 +465,7 @@ static JNIEnv* getGlobalJNIEnv(void)
     }
     else {
         //Attach this thread to the VM
-        JavaVM* vm = vmBuf[0];
+        vm = vmBuf[0];
         rv = (*vm)->AttachCurrentThread(vm, (void*)&env, 0);
         if (rv != 0) {
             fprintf(stderr, "Call to AttachCurrentThread "
@@ -557,54 +499,27 @@ static JNIEnv* getGlobalJNIEnv(void)
 JNIEnv* getJNIEnv(void)
 {
     JNIEnv *env;
-    struct hdfsTls *tls;
-    int ret;
-
-#ifdef HAVE_BETTER_TLS
-    static __thread struct hdfsTls *quickTls = NULL;
-    if (quickTls)
-        return quickTls->env;
-#endif
-    pthread_mutex_lock(&jvmMutex);
-    if (!gTlsKeyInitialized) {
-        ret = pthread_key_create(&gTlsKey, hdfsThreadDestructor);
-        if (ret) {
-            pthread_mutex_unlock(&jvmMutex);
-            fprintf(stderr, "getJNIEnv: pthread_key_create failed with "
-                "error %d\n", ret);
-            return NULL;
-        }
-        gTlsKeyInitialized = 1;
+    THREAD_LOCAL_STORAGE_GET_QUICK();
+    mutexLock(&jvmMutex);
+    if (threadLocalStorageGet(&env)) {
+      mutexUnlock(&jvmMutex);
+      return NULL;
     }
-    tls = pthread_getspecific(gTlsKey);
-    if (tls) {
-        pthread_mutex_unlock(&jvmMutex);
-        return tls->env;
+    if (env) {
+      mutexUnlock(&jvmMutex);
+      return env;
     }
 
     env = getGlobalJNIEnv();
-    pthread_mutex_unlock(&jvmMutex);
+    mutexUnlock(&jvmMutex);
     if (!env) {
-        fprintf(stderr, "getJNIEnv: getGlobalJNIEnv failed\n");
-        return NULL;
+      fprintf(stderr, "getJNIEnv: getGlobalJNIEnv failed\n");
+      return NULL;
     }
-    tls = calloc(1, sizeof(struct hdfsTls));
-    if (!tls) {
-        fprintf(stderr, "getJNIEnv: OOM allocating %zd bytes\n",
-                sizeof(struct hdfsTls));
-        return NULL;
+    if (threadLocalStorageSet(env)) {
+      return NULL;
     }
-    tls->env = env;
-    ret = pthread_setspecific(gTlsKey, tls);
-    if (ret) {
-        fprintf(stderr, "getJNIEnv: pthread_setspecific failed with "
-            "error code %d\n", ret);
-        hdfsThreadDestructor(tls);
-        return NULL;
-    }
-#ifdef HAVE_BETTER_TLS
-    quickTls = tls;
-#endif
+    THREAD_LOCAL_STORAGE_SET_QUICK(env);
     return env;
 }
 

hadoop-hdfs-project/hadoop-hdfs/src/main/native/libhdfs/jni_helper.h

@@ -24,8 +24,6 @@
 
 #include <stdlib.h>
 #include <stdarg.h>
-#include <search.h>
-#include <pthread.h>
 #include <errno.h>
 
 #define PATH_SEPARATOR ':'

hadoop-hdfs-project/hadoop-hdfs/src/main/native/libhdfs/native_mini_dfs.c

@@ -21,6 +21,7 @@
 #include "hdfs_test.h"
 #include "jni_helper.h"
 #include "native_mini_dfs.h"
+#include "platform.h"
 
 #include <errno.h>
 #include <jni.h>
@@ -347,10 +348,11 @@ error_dlr_nn:
 int nmdConfigureHdfsBuilder(struct NativeMiniDfsCluster *cl,
                             struct hdfsBuilder *bld)
 {
-    int port, ret;
+    int ret;
+    tPort port;
 
     hdfsBuilderSetNameNode(bld, "localhost");
-    port = nmdGetNameNodePort(cl);
+    port = (tPort)nmdGetNameNodePort(cl);
     if (port < 0) {
       fprintf(stderr, "nmdGetNameNodePort failed with error %d\n", -port);
       return EIO;

hadoop-hdfs-project/hadoop-hdfs/src/main/native/libhdfs/os/mutexes.h

@@ -0,0 +1,55 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef LIBHDFS_MUTEXES_H
+#define LIBHDFS_MUTEXES_H
+
+/*
+ * Defines abstraction over platform-specific mutexes.  libhdfs has no formal
+ * initialization function that users would call from a single-threaded context
+ * to initialize the library.  This creates a challenge for bootstrapping the
+ * mutexes.  To address this, all required mutexes are pre-defined here with
+ * external storage.  Platform-specific implementations must guarantee that the
+ * mutexes are initialized via static initialization.
+ */
+
+#include "platform.h"
+
+/** Mutex protecting the class reference hash table. */
+extern mutex hdfsHashMutex;
+
+/** Mutex protecting singleton JVM instance. */
+extern mutex jvmMutex;
+
+/**
+ * Locks a mutex.
+ *
+ * @param m mutex
+ * @return 0 if successful, non-zero otherwise
+ */
+int mutexLock(mutex *m);
+
+/**
+ * Unlocks a mutex.
+ *
+ * @param m mutex
+ * @return 0 if successful, non-zero otherwise
+ */
+int mutexUnlock(mutex *m);
+
+#endif

hadoop-hdfs-project/hadoop-hdfs/src/main/native/libhdfs/os/posix/mutexes.c

@@ -16,23 +16,28 @@
  * limitations under the License.
  */
 
-package org.apache.hadoop.yarn.server.resourcemanager.rmapp.attempt.event;
+#include "os/mutexes.h"
 
-import org.apache.hadoop.yarn.api.records.ApplicationAttemptId;
-import org.apache.hadoop.yarn.server.resourcemanager.rmapp.attempt.RMAppAttemptEvent;
-import org.apache.hadoop.yarn.server.resourcemanager.rmapp.attempt.RMAppAttemptEventType;
+#include <pthread.h>
+#include <stdio.h>
 
-public class RMAppAttemptUpdateSavedEvent extends RMAppAttemptEvent {
+mutex hdfsHashMutex = PTHREAD_MUTEX_INITIALIZER;
+mutex jvmMutex = PTHREAD_MUTEX_INITIALIZER;
 
-  final Exception updatedException;
-
-  public RMAppAttemptUpdateSavedEvent(ApplicationAttemptId appAttemptId,
-      Exception updatedException) {
-    super(appAttemptId, RMAppAttemptEventType.ATTEMPT_UPDATE_SAVED);
-    this.updatedException = updatedException;
-  }
-
-  public Exception getUpdatedException() {
-    return updatedException;
+int mutexLock(mutex *m) {
+  int ret = pthread_mutex_lock(m);
+  if (ret) {
+    fprintf(stderr, "mutexLock: pthread_mutex_lock failed with error %d\n",
+      ret);
   }
+  return ret;
+}
+
+int mutexUnlock(mutex *m) {
+  int ret = pthread_mutex_unlock(m);
+  if (ret) {
+    fprintf(stderr, "mutexUnlock: pthread_mutex_unlock failed with error %d\n",
+      ret);
+  }
+  return ret;
 }

hadoop-hdfs-project/hadoop-hdfs/src/main/native/libhdfs/os/posix/platform.h

@@ -16,21 +16,19 @@
  * limitations under the License.
  */
 
-package org.apache.hadoop.yarn.server.resourcemanager.rmapp;
+#ifndef LIBHDFS_PLATFORM_H
+#define LIBHDFS_PLATFORM_H
 
-import org.apache.hadoop.yarn.api.records.ApplicationId;
+#include <pthread.h>
 
-public class RMAppNewSavedEvent extends RMAppEvent {
+/* Use gcc type-checked format arguments. */
+#define TYPE_CHECKED_PRINTF_FORMAT(formatArg, varArgs) \
+  __attribute__((format(printf, formatArg, varArgs)))
 
-  private final Exception storedException;
+/*
+ * Mutex and thread data types defined by pthreads.
+ */
+typedef pthread_mutex_t mutex;
+typedef pthread_t threadId;
 
-  public RMAppNewSavedEvent(ApplicationId appId, Exception storedException) {
-    super(appId, RMAppEventType.APP_NEW_SAVED);
-    this.storedException = storedException;
-  }
-
-  public Exception getStoredException() {
-    return storedException;
-  }
-
-}
+#endif

hadoop-hdfs-project/hadoop-hdfs/src/main/native/libhdfs/os/posix/thread.c

@@ -0,0 +1,52 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "os/thread.h"
+
+#include <pthread.h>
+#include <stdio.h>
+
+/**
+ * Defines a helper function that adapts function pointer provided by caller to
+ * the type required by pthread_create.
+ *
+ * @param toRun thread to run
+ * @return void* result of running thread (always NULL)
+ */
+static void* runThread(void *toRun) {
+  const thread *t = toRun;
+  t->start(t->arg);
+  return NULL;
+}
+
+int threadCreate(thread *t) {
+  int ret;
+  ret = pthread_create(&t->id, NULL, runThread, t);
+  if (ret) {
+    fprintf(stderr, "threadCreate: pthread_create failed with error %d\n", ret);
+  }
+  return ret;
+}
+
+int threadJoin(const thread *t) {
+  int ret = pthread_join(t->id, NULL);
+  if (ret) {
+    fprintf(stderr, "threadJoin: pthread_join failed with error %d\n", ret);
+  }
+  return ret;
+}

hadoop-hdfs-project/hadoop-hdfs/src/main/native/libhdfs/os/posix/thread_local_storage.c

@@ -0,0 +1,80 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "os/thread_local_storage.h"
+
+#include <jni.h>
+#include <pthread.h>
+#include <stdio.h>
+
+/** Key that allows us to retrieve thread-local storage */
+static pthread_key_t gTlsKey;
+
+/** nonzero if we succeeded in initializing gTlsKey. Protected by the jvmMutex */
+static int gTlsKeyInitialized = 0;
+
+/**
+ * The function that is called whenever a thread with libhdfs thread local data
+ * is destroyed.
+ *
+ * @param v         The thread-local data
+ */
+static void hdfsThreadDestructor(void *v)
+{
+  JavaVM *vm;
+  JNIEnv *env = v;
+  jint ret;
+
+  ret = (*env)->GetJavaVM(env, &vm);
+  if (ret) {
+    fprintf(stderr, "hdfsThreadDestructor: GetJavaVM failed with error %d\n",
+      ret);
+    (*env)->ExceptionDescribe(env);
+  } else {
+    (*vm)->DetachCurrentThread(vm);
+  }
+}
+
+int threadLocalStorageGet(JNIEnv **env)
+{
+  int ret = 0;
+  if (!gTlsKeyInitialized) {
+    ret = pthread_key_create(&gTlsKey, hdfsThreadDestructor);
+    if (ret) {
+      fprintf(stderr,
+        "threadLocalStorageGet: pthread_key_create failed with error %d\n",
+        ret);
+      return ret;
+    }
+    gTlsKeyInitialized = 1;
+  }
+  *env = pthread_getspecific(gTlsKey);
+  return ret;
+}
+
+int threadLocalStorageSet(JNIEnv *env)
+{
+  int ret = pthread_setspecific(gTlsKey, env);
+  if (ret) {
+    fprintf(stderr,
+      "threadLocalStorageSet: pthread_setspecific failed with error %d\n",
+      ret);
+    hdfsThreadDestructor(env);
+  }
+  return ret;
+}