Merge r1609845 through r1614231 from trunk.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/HDFS-6584@1614234 13f79535-47bb-0310-9956-ffa450edef68

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

@@ -189,6 +189,9 @@ Trunk (Unreleased)
     HADOOP-10720. KMS: Implement generateEncryptedKey and decryptEncryptedKey
     in the REST API. (asuresh via tucu)
 
+    HADOOP-10891. Add EncryptedKeyVersion factory method to
+    KeyProviderCryptoExtension. (wang)
+
   BUG FIXES
 
     HADOOP-9451. Fault single-layer config if node group topology is enabled.
@@ -452,6 +455,11 @@ Release 2.6.0 - UNRELEASED
 
     HADOOP-10855. Allow Text to be read with a known Length. (todd)
 
+    HADOOP-10887. Add XAttrs to ViewFs and make XAttrs + ViewFileSystem
+    internal dir behavior consistent. (Stephen Chu via wang)
+
+    HADOOP-10882. Move DirectBufferPool into common util. (todd)
+
   OPTIMIZATIONS
 
   BUG FIXES
@@ -480,6 +488,12 @@ Release 2.6.0 - UNRELEASED
     command when the format of the stat command uses non-curly quotes (yzhang
     via cmccabe)
 
+    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)
+
 Release 2.5.0 - UNRELEASED
 
   INCOMPATIBLE CHANGES
@@ -492,6 +506,9 @@ Release 2.5.0 - UNRELEASED
 
     HADOOP-8943. Support multiple group mapping providers. (Kai Zheng via brandonli)
 
+    HADOOP-9361 Strictly define the expected behavior of filesystem APIs and
+    write tests to verify compliance (stevel)
+
   IMPROVEMENTS
 
     HADOOP-10451. Remove unused field and imports from SaslRpcServer.
@@ -586,9 +603,6 @@ Release 2.5.0 - UNRELEASED
     HADOOP-10747. Support configurable retries on SASL connection failures in
     RPC client. (cnauroth)
 
-    HADOOP-10674. Improve PureJavaCrc32 performance and use java.util.zip.CRC32
-    for Java 7 and above. (szetszwo)
-
     HADOOP-10754. Reenable several HA ZooKeeper-related tests on Windows.
     (cnauroth)
 
@@ -600,9 +614,6 @@ Release 2.5.0 - UNRELEASED
 
     HADOOP-10767. Clean up unused code in Ls shell command. (cnauroth)
 
-    HADOOP-9361 Strictly define the expected behavior of filesystem APIs and
-    write tests to verify compliance (stevel)
-
     HADOOP-9651 Filesystems to throw FileAlreadyExistsException in
     createFile(path, overwrite=false) when the file exists (stevel)
     
@@ -613,8 +624,14 @@ Release 2.5.0 - UNRELEASED
 
     HADOOP-10782. Fix typo in DataChecksum class. (Jingguo Yao via suresh)
 
+    HADOOP-10896. Update compatibility doc to capture visibility of 
+    un-annotated classes/ methods. (kasha)
+
   OPTIMIZATIONS
 
+    HADOOP-10674. Improve PureJavaCrc32 performance and use java.util.zip.CRC32
+    for Java 7 and above. (szetszwo)
+
   BUG FIXES 
 
     HADOOP-10378. Typo in help printed by hdfs dfs -help.
@@ -769,6 +786,30 @@ Release 2.5.0 - UNRELEASED
 
     HADOOP-10801 dead link in site.xml (Akira AJISAKA via stevel)
 
+    HADOOP-10590. ServiceAuthorizationManager is not threadsafe. (Benoy Antony via vinayakumarb)
+
+    HADOOP-10711. Cleanup some extra dependencies from hadoop-auth. (rkanter via tucu)
+
+    HADOOP-10479. Fix new findbugs warnings in hadoop-minikdc.
+    (Swarnim Kulkarni via wheat9)
+
+    HADOOP-10715. Remove public GraphiteSink#setWriter (Babak Behzad via raviprak)
+
+    HADOOP-10710. hadoop.auth cookie is not properly constructed according to 
+    RFC2109. (Juan Yu via tucu)
+
+    HADOOP-10864. Tool documentenation is broken. (Akira Ajisaka
+    via Arpit Agarwal)
+
+    HADOOP-10872. TestPathData fails intermittently with "Mkdirs failed
+    to create d1". (Yongjun Zhang via Arpit Agarwal)
+
+    HADOOP-10890. TestDFVariations.testMount fails intermittently. (Yongjun
+    Zhang via Arpit Agarwal)
+
+    HADOOP-10894. Fix dead link in ToolRunner documentation. (Akira Ajisaka
+    via Arpit Agarwal)
+
   BREAKDOWN OF HADOOP-10514 SUBTASKS AND RELATED JIRAS
 
     HADOOP-10520. Extended attributes definition and FileSystem APIs for
@@ -790,21 +831,6 @@ Release 2.5.0 - UNRELEASED
     HADOOP-10561. Copy command with preserve option should handle Xattrs.
     (Yi Liu via cnauroth)
 
-    HADOOP-10590. ServiceAuthorizationManager is not threadsafe. (Benoy Antony via vinayakumarb)
-
-    HADOOP-10711. Cleanup some extra dependencies from hadoop-auth. (rkanter via tucu)
-
-    HADOOP-10479. Fix new findbugs warnings in hadoop-minikdc.
-    (Swarnim Kulkarni via wheat9)
-
-    HADOOP-10715. Remove public GraphiteSink#setWriter (Babak Behzad via raviprak)
-
-    HADOOP-10710. hadoop.auth cookie is not properly constructed according to 
-    RFC2109. (Juan Yu via tucu)
-
-    HADOOP-10864. Tool documentenation is broken. (Akira Ajisaka
-    via Arpit Agarwal)
-
 Release 2.4.1 - 2014-06-23 
 
   INCOMPATIBLE CHANGES

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

@@ -79,6 +79,30 @@ protected EncryptedKeyVersion(String keyName,
       this.encryptedKeyVersion = encryptedKeyVersion;
     }
 
+    /**
+     * Factory method to create a new EncryptedKeyVersion that can then be
+     * passed into {@link #decryptEncryptedKey}. Note that the fields of the
+     * returned EncryptedKeyVersion will only partially be populated; it is not
+     * necessarily suitable for operations besides decryption.
+     *
+     * @param encryptionKeyVersionName Version name of the encryption key used
+     *                                 to encrypt the encrypted key.
+     * @param encryptedKeyIv           Initialization vector of the encrypted
+     *                                 key. The IV of the encryption key used to
+     *                                 encrypt the encrypted key is derived from
+     *                                 this IV.
+     * @param encryptedKeyMaterial     Key material of the encrypted key.
+     * @return EncryptedKeyVersion suitable for decryption.
+     */
+    public static EncryptedKeyVersion createForDecryption(String
+        encryptionKeyVersionName, byte[] encryptedKeyIv,
+        byte[] encryptedKeyMaterial) {
+      KeyVersion encryptedKeyVersion = new KeyVersion(null, null,
+          encryptedKeyMaterial);
+      return new EncryptedKeyVersion(null, encryptionKeyVersionName,
+          encryptedKeyIv, encryptedKeyVersion);
+    }
+
     /**
      * @return Name of the encryption key used to encrypt the encrypted key.
      */

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

@@ -437,7 +437,9 @@ private FSDataOutputStream create(Path f, FsPermission permission,
         throw new FileNotFoundException("Parent directory doesn't exist: "
             + parent);
       } else if (!mkdirs(parent)) {
-        throw new IOException("Mkdirs failed to create " + parent);
+        throw new IOException("Mkdirs failed to create " + parent
+            + " (exists=" + exists(parent) + ", cwd=" + getWorkingDirectory()
+            + ")");
       }
     }
     final FSDataOutputStream out;

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

@@ -2484,4 +2484,33 @@ public Void next(final AbstractFileSystem fs, final Path p)
       }
     }.resolve(this, absF);
   }
+
+  /**
+   * Get all of the xattr names for a file or directory.
+   * Only those xattr names which the logged-in user has permissions to view
+   * are returned.
+   * <p/>
+   * A regular user can only get xattr names for the "user" namespace.
+   * The super user can only get xattr names for "user" and "trusted"
+   * namespaces.
+   * The xattrs of the "security" and "system" namespaces are only
+   * used/exposed internally by/to the FS impl.
+   * <p/>
+   * @see <a href="http://en.wikipedia.org/wiki/Extended_file_attributes">
+   * http://en.wikipedia.org/wiki/Extended_file_attributes</a>
+   *
+   * @param path Path to get extended attributes
+   * @return List<String> of the XAttr names of the file or directory
+   * @throws IOException
+   */
+  public List<String> listXAttrs(Path path) throws IOException {
+    final Path absF = fixRelativePart(path);
+    return new FSLinkResolver<List<String>>() {
+      @Override
+      public List<String> next(final AbstractFileSystem fs, final Path p)
+          throws IOException {
+        return fs.listXAttrs(p);
+      }
+    }.resolve(this, absF);
+  }
 }

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

@@ -2509,7 +2509,7 @@ public Map<String, byte[]> getXAttrs(Path path, List<String> names)
    * http://en.wikipedia.org/wiki/Extended_file_attributes</a>
    *
    * @param path Path to get extended attributes
-   * @return Map<String, byte[]> describing the XAttrs of the file or directory
+   * @return List<String> of the XAttr names of the file or directory
    * @throws IOException
    */
   public List<String> listXAttrs(Path path) throws IOException {

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

@@ -129,6 +129,19 @@ private void checkPathArg( String path ) throws IllegalArgumentException {
     }   
   }
 
+  /** 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 {
@@ -176,6 +189,7 @@ public Path(String pathString) throws IllegalArgumentException {
    * 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/fs/viewfs/ChRootedFs.java

@@ -22,6 +22,7 @@
 import java.net.URISyntaxException;
 import java.util.EnumSet;
 import java.util.List;
+import java.util.Map;
 
 import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.classification.InterfaceStability;
@@ -37,6 +38,7 @@
 import org.apache.hadoop.fs.Options.ChecksumOpt;
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.fs.UnresolvedLinkException;
+import org.apache.hadoop.fs.XAttrSetFlag;
 import org.apache.hadoop.fs.permission.AclEntry;
 import org.apache.hadoop.fs.permission.AclStatus;
 import org.apache.hadoop.fs.permission.FsPermission;
@@ -313,6 +315,38 @@ public AclStatus getAclStatus(Path path) throws IOException {
     return myFs.getAclStatus(fullPath(path));
   }
 
+  @Override
+  public void setXAttr(Path path, String name, byte[] value,
+                       EnumSet<XAttrSetFlag> flag) throws IOException {
+    myFs.setXAttr(fullPath(path), name, value, flag);
+  }
+
+  @Override
+  public byte[] getXAttr(Path path, String name) throws IOException {
+    return myFs.getXAttr(fullPath(path), name);
+  }
+
+  @Override
+  public Map<String, byte[]> getXAttrs(Path path) throws IOException {
+    return myFs.getXAttrs(fullPath(path));
+  }
+
+  @Override
+  public Map<String, byte[]> getXAttrs(Path path, List<String> names)
+      throws IOException {
+    return myFs.getXAttrs(fullPath(path), names);
+  }
+
+  @Override
+  public List<String> listXAttrs(Path path) throws IOException {
+    return myFs.listXAttrs(fullPath(path));
+  }
+
+  @Override
+  public void removeXAttr(Path path, String name) throws IOException {
+    myFs.removeXAttr(fullPath(path), name);
+  }
+
   @Override
   public void setVerifyChecksum(final boolean verifyChecksum) 
       throws IOException, UnresolvedLinkException {

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

@@ -913,5 +913,39 @@ public AclStatus getAclStatus(Path path) throws IOException {
           .addEntries(AclUtil.getMinimalAcl(PERMISSION_555))
           .stickyBit(false).build();
     }
+
+    @Override
+    public void setXAttr(Path path, String name, byte[] value,
+                         EnumSet<XAttrSetFlag> flag) throws IOException {
+      checkPathIsSlash(path);
+      throw readOnlyMountTable("setXAttr", path);
+    }
+
+    @Override
+    public byte[] getXAttr(Path path, String name) throws IOException {
+      throw new NotInMountpointException(path, "getXAttr");
+    }
+
+    @Override
+    public Map<String, byte[]> getXAttrs(Path path) throws IOException {
+      throw new NotInMountpointException(path, "getXAttrs");
+    }
+
+    @Override
+    public Map<String, byte[]> getXAttrs(Path path, List<String> names)
+        throws IOException {
+      throw new NotInMountpointException(path, "getXAttrs");
+    }
+
+    @Override
+    public List<String> listXAttrs(Path path) throws IOException {
+      throw new NotInMountpointException(path, "listXAttrs");
+    }
+
+    @Override
+    public void removeXAttr(Path path, String name) throws IOException {
+      checkPathIsSlash(path);
+      throw readOnlyMountTable("removeXAttr", path);
+    }
   }
 }

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

@@ -26,6 +26,7 @@
 import java.util.ArrayList;
 import java.util.EnumSet;
 import java.util.List;
+import java.util.Map;
 import java.util.Map.Entry;
 
 import org.apache.hadoop.classification.InterfaceAudience;
@@ -48,6 +49,7 @@
 import org.apache.hadoop.fs.RemoteIterator;
 import org.apache.hadoop.fs.UnresolvedLinkException;
 import org.apache.hadoop.fs.UnsupportedFileSystemException;
+import org.apache.hadoop.fs.XAttrSetFlag;
 import org.apache.hadoop.fs.local.LocalConfigKeys;
 import org.apache.hadoop.fs.permission.AclEntry;
 import org.apache.hadoop.fs.permission.AclUtil;
@@ -652,6 +654,50 @@ public AclStatus getAclStatus(Path path) throws IOException {
     return res.targetFileSystem.getAclStatus(res.remainingPath);
   }
 
+  @Override
+  public void setXAttr(Path path, String name, byte[] value,
+                       EnumSet<XAttrSetFlag> flag) throws IOException {
+    InodeTree.ResolveResult<AbstractFileSystem> res =
+        fsState.resolve(getUriPath(path), true);
+    res.targetFileSystem.setXAttr(res.remainingPath, name, value, flag);
+  }
+
+  @Override
+  public byte[] getXAttr(Path path, String name) throws IOException {
+    InodeTree.ResolveResult<AbstractFileSystem> res =
+        fsState.resolve(getUriPath(path), true);
+    return res.targetFileSystem.getXAttr(res.remainingPath, name);
+  }
+
+  @Override
+  public Map<String, byte[]> getXAttrs(Path path) throws IOException {
+    InodeTree.ResolveResult<AbstractFileSystem> res =
+        fsState.resolve(getUriPath(path), true);
+    return res.targetFileSystem.getXAttrs(res.remainingPath);
+  }
+
+  @Override
+  public Map<String, byte[]> getXAttrs(Path path, List<String> names)
+      throws IOException {
+    InodeTree.ResolveResult<AbstractFileSystem> res =
+        fsState.resolve(getUriPath(path), true);
+    return res.targetFileSystem.getXAttrs(res.remainingPath, names);
+  }
+
+  @Override
+  public List<String> listXAttrs(Path path) throws IOException {
+    InodeTree.ResolveResult<AbstractFileSystem> res =
+        fsState.resolve(getUriPath(path), true);
+    return res.targetFileSystem.listXAttrs(res.remainingPath);
+  }
+
+  @Override
+  public void removeXAttr(Path path, String name) throws IOException {
+    InodeTree.ResolveResult<AbstractFileSystem> res =
+        fsState.resolve(getUriPath(path), true);
+    res.targetFileSystem.removeXAttr(res.remainingPath, name);
+  }
+  
   
   /*
    * An instance of this class represents an internal dir of the viewFs 
@@ -921,5 +967,39 @@ public AclStatus getAclStatus(Path path) throws IOException {
           .addEntries(AclUtil.getMinimalAcl(PERMISSION_555))
           .stickyBit(false).build();
     }
+
+    @Override
+    public void setXAttr(Path path, String name, byte[] value,
+                         EnumSet<XAttrSetFlag> flag) throws IOException {
+      checkPathIsSlash(path);
+      throw readOnlyMountTable("setXAttr", path);
+    }
+
+    @Override
+    public byte[] getXAttr(Path path, String name) throws IOException {
+      throw new NotInMountpointException(path, "getXAttr");
+    }
+
+    @Override
+    public Map<String, byte[]> getXAttrs(Path path) throws IOException {
+      throw new NotInMountpointException(path, "getXAttrs");
+    }
+
+    @Override
+    public Map<String, byte[]> getXAttrs(Path path, List<String> names)
+        throws IOException {
+      throw new NotInMountpointException(path, "getXAttrs");
+    }
+
+    @Override
+    public List<String> listXAttrs(Path path) throws IOException {
+      throw new NotInMountpointException(path, "listXAttrs");
+    }
+
+    @Override
+    public void removeXAttr(Path path, String name) throws IOException {
+      checkPathIsSlash(path);
+      throw readOnlyMountTable("removeXAttr", path);
+    }
   }
 }

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/alias/JavaKeyStoreProvider.java

@@ -194,15 +194,18 @@ public List<String> getAliases() throws IOException {
   @Override
   public CredentialEntry createCredentialEntry(String alias, char[] credential)
       throws IOException {
+    writeLock.lock();
     try {
       if (keyStore.containsAlias(alias) || cache.containsKey(alias)) {
         throw new IOException("Credential " + alias + " already exists in " + this);
       }
+      return innerSetCredential(alias, credential);
     } catch (KeyStoreException e) {
       throw new IOException("Problem looking up credential " + alias + " in " + this,
           e);
+    } finally {
+      writeLock.unlock();
     }
-    return innerSetCredential(alias, credential);
   }
 
   @Override

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/DirectBufferPool.java

@@ -15,7 +15,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.apache.hadoop.hdfs.util;
+package org.apache.hadoop.util;
 
 import java.lang.ref.WeakReference;
 import java.nio.ByteBuffer;
@@ -27,6 +27,7 @@
 import org.apache.hadoop.classification.InterfaceAudience;
 
 import com.google.common.annotations.VisibleForTesting;
+import org.apache.hadoop.classification.InterfaceStability;
 
 /**
  * A simple class for pooling direct ByteBuffers. This is necessary
@@ -40,7 +41,8 @@
  * allocated at the same size. There is no attempt to reuse larger
  * buffers to satisfy smaller allocations.
  */
-@InterfaceAudience.Private
+@InterfaceAudience.LimitedPrivate({"HDFS", "MapReduce"})
+@InterfaceStability.Evolving
 public class DirectBufferPool {
 
   // Essentially implement a multimap with weak values.

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/ToolRunner.java

@@ -30,7 +30,7 @@
  * <p><code>ToolRunner</code> can be used to run classes implementing 
  * <code>Tool</code> interface. It works in conjunction with 
  * {@link GenericOptionsParser} to parse the 
- * <a href="{@docRoot}/org/apache/hadoop/util/GenericOptionsParser.html#GenericOptions">
+ * <a href="{@docRoot}/../hadoop-project-dist/hadoop-common/CommandsManual.html#Generic_Options">
  * generic hadoop command line arguments</a> and modifies the 
  * <code>Configuration</code> of the <code>Tool</code>. The 
  * application-specific options are passed along without being modified.

hadoop-common-project/hadoop-common/src/site/apt/Compatibility.apt.vm

@@ -72,9 +72,12 @@ Apache Hadoop Compatibility
     * Private-Stable APIs can change across major releases,
     but not within a major release.
 
+    * Classes not annotated are implicitly "Private". Class members not
+    annotated inherit the annotations of the enclosing class.
+
     * Note: APIs generated from the proto files need to be compatible for
-rolling-upgrades. See the section on wire-compatibility for more details. The
+    rolling-upgrades. See the section on wire-compatibility for more details.
-compatibility policies for APIs and wire-communication need to go
+    The compatibility policies for APIs and wire-communication need to go
     hand-in-hand to address this.
 
 ** Semantic compatibility

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

@@ -29,14 +29,33 @@
 
 import org.apache.hadoop.test.GenericTestUtils;
 import org.apache.hadoop.util.Shell;
+import org.junit.After;
+import org.junit.Before;
 import org.junit.Test;
+
 import static org.junit.Assert.*;
 
 public class TestDFVariations {
+  private static final String TEST_ROOT_DIR =
+      System.getProperty("test.build.data","build/test/data") + "/TestDFVariations";
+  private static File test_root = null;
+
+  @Before
+  public void setup() throws IOException {
+    test_root = new File(TEST_ROOT_DIR);
+    test_root.mkdirs();
+  }
+  
+  @After
+  public void after() throws IOException {
+    FileUtil.setWritable(test_root, true);
+    FileUtil.fullyDelete(test_root);
+    assertTrue(!test_root.exists());
+  }
   
   public static class XXDF extends DF {
     public XXDF() throws IOException {
-      super(new File(System.getProperty("test.build.data","/tmp")), 0L);
+      super(test_root, 0L);
     }
 
     @Override

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

@@ -26,11 +26,13 @@
 
 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 {
   /**
@@ -305,6 +307,28 @@ public void testURI() throws URISyntaxException, IOException {
     // 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/fs/shell/TestPathData.java

@@ -35,6 +35,8 @@
 import org.junit.Test;
 
 public class TestPathData {
+  private static final String TEST_ROOT_DIR = 
+      System.getProperty("test.build.data","build/test/data") + "/testPD";
   protected Configuration conf;
   protected FileSystem fs;
   protected Path testDir;
@@ -43,11 +45,12 @@ public class TestPathData {
   public void initialize() throws Exception {
     conf = new Configuration();
     fs = FileSystem.getLocal(conf);
-    testDir = new Path(
+    testDir = new Path(TEST_ROOT_DIR);
-        System.getProperty("test.build.data", "build/test/data") + "/testPD"
+    
-    );
     // don't want scheme on the path, just an absolute path
     testDir = new Path(fs.makeQualified(testDir).toUri().getPath());
+    fs.mkdirs(testDir);
+
     FileSystem.setDefaultUri(conf, fs.getUri());    
     fs.setWorkingDirectory(testDir);
     fs.mkdirs(new Path("d1"));
@@ -60,6 +63,7 @@ public void initialize() throws Exception {
 
   @After
   public void cleanup() throws Exception {
+    fs.delete(testDir, true);
     fs.close();
   }
 

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

@@ -773,4 +773,34 @@ public void testInternalGetAclStatus() throws IOException {
     assertFalse(aclStatus.isStickyBit());
   }
 
+  @Test(expected=AccessControlException.class)
+  public void testInternalSetXAttr() throws IOException {
+    fsView.setXAttr(new Path("/internalDir"), "xattrName", null);
+  }
+
+  @Test(expected=NotInMountpointException.class)
+  public void testInternalGetXAttr() throws IOException {
+    fsView.getXAttr(new Path("/internalDir"), "xattrName");
+  }
+
+  @Test(expected=NotInMountpointException.class)
+  public void testInternalGetXAttrs() throws IOException {
+    fsView.getXAttrs(new Path("/internalDir"));
+  }
+
+  @Test(expected=NotInMountpointException.class)
+  public void testInternalGetXAttrsWithNames() throws IOException {
+    fsView.getXAttrs(new Path("/internalDir"), new ArrayList<String>());
+  }
+
+  @Test(expected=NotInMountpointException.class)
+  public void testInternalListXAttr() throws IOException {
+    fsView.listXAttrs(new Path("/internalDir"));
+  }
+
+  @Test(expected=AccessControlException.class)
+  public void testInternalRemoveXAttr() throws IOException {
+    fsView.removeXAttr(new Path("/internalDir"), "xattrName");
+  }
+
 }

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

@@ -747,4 +747,34 @@ public void testInternalGetAclStatus() throws IOException {
         AclUtil.getMinimalAcl(PERMISSION_555));
     assertFalse(aclStatus.isStickyBit());
   }
+
+  @Test(expected=AccessControlException.class)
+  public void testInternalSetXAttr() throws IOException {
+    fcView.setXAttr(new Path("/internalDir"), "xattrName", null);
+  }
+
+  @Test(expected=NotInMountpointException.class)
+  public void testInternalGetXAttr() throws IOException {
+    fcView.getXAttr(new Path("/internalDir"), "xattrName");
+  }
+
+  @Test(expected=NotInMountpointException.class)
+  public void testInternalGetXAttrs() throws IOException {
+    fcView.getXAttrs(new Path("/internalDir"));
+  }
+
+  @Test(expected=NotInMountpointException.class)
+  public void testInternalGetXAttrsWithNames() throws IOException {
+    fcView.getXAttrs(new Path("/internalDir"), new ArrayList<String>());
+  }
+
+  @Test(expected=NotInMountpointException.class)
+  public void testInternalListXAttr() throws IOException {
+    fcView.listXAttrs(new Path("/internalDir"));
+  }
+
+  @Test(expected=AccessControlException.class)
+  public void testInternalRemoveXAttr() throws IOException {
+    fcView.removeXAttr(new Path("/internalDir"), "xattrName");
+  }
 }

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/util/TestDirectBufferPool.java

@@ -15,7 +15,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.apache.hadoop.hdfs.util;
+package org.apache.hadoop.util;
 
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNotSame;
@@ -29,7 +29,7 @@
 import com.google.common.collect.Lists;
 
 public class TestDirectBufferPool {
-  final DirectBufferPool pool = new DirectBufferPool();
+  final org.apache.hadoop.util.DirectBufferPool pool = new org.apache.hadoop.util.DirectBufferPool();
   
   @Test
   public void testBasics() {

hadoop-common-project/hadoop-nfs/src/main/java/org/apache/hadoop/nfs/NfsExports.java

@@ -53,7 +53,12 @@ public static synchronized NfsExports getInstance(Configuration conf) {
       long expirationPeriodNano = conf.getLong(
           Nfs3Constant.NFS_EXPORTS_CACHE_EXPIRYTIME_MILLIS_KEY,
           Nfs3Constant.NFS_EXPORTS_CACHE_EXPIRYTIME_MILLIS_DEFAULT) * 1000 * 1000;
+      try {
         exports = new NfsExports(cacheSize, expirationPeriodNano, matchHosts);
+      } catch (IllegalArgumentException e) {
+        LOG.error("Invalid NFS Exports provided: ", e);
+        return exports;
+      }
     }
     return exports;
   }

hadoop-hdfs-project/hadoop-hdfs-nfs/src/main/java/org/apache/hadoop/hdfs/nfs/mount/RpcProgramMountd.java

@@ -104,6 +104,10 @@ public XDR nullOp(XDR out, int xid, InetAddress client) {
 
   @Override
   public XDR mnt(XDR xdr, XDR out, int xid, InetAddress client) {
+    if (hostsMatcher == null) {
+      return MountResponse.writeMNTResponse(Nfs3Status.NFS3ERR_ACCES, out, xid,
+          null);
+    }
     AccessPrivilege accessPrivilege = hostsMatcher.getAccessPrivilege(client);
     if (accessPrivilege == AccessPrivilege.NONE) {
       return MountResponse.writeMNTResponse(Nfs3Status.NFS3ERR_ACCES, out, xid,
@@ -210,8 +214,15 @@ public void handleInternal(ChannelHandlerContext ctx, RpcInfo info) {
     } else if (mntproc == MNTPROC.EXPORT) {
       // Currently only support one NFS export
       List<NfsExports> hostsMatchers = new ArrayList<NfsExports>();
+      if (hostsMatcher != null) {
         hostsMatchers.add(hostsMatcher);
         out = MountResponse.writeExportList(out, xid, exports, hostsMatchers);
+      } else {
+        // This means there are no valid exports provided.
+        RpcAcceptedReply.getInstance(xid,
+          RpcAcceptedReply.AcceptState.PROC_UNAVAIL, new VerifierNone()).write(
+          out);
+      }
     } else {
       // Invalid procedure
       RpcAcceptedReply.getInstance(xid,

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

@@ -2125,6 +2125,9 @@ private boolean checkAccessPrivilege(SocketAddress remoteAddress,
     }
 
     // Check export table
+    if (exports == null) {
+        return false;
+    }
     InetAddress client = ((InetSocketAddress) remoteAddress).getAddress();
     AccessPrivilege access = exports.getAccessPrivilege(client);
     if (access == AccessPrivilege.NONE) {

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

@@ -272,6 +272,9 @@ Trunk (Unreleased)
     HDFS-5794. Fix the inconsistency of layout version number of 
     ADD_DATANODE_AND_STORAGE_UUIDS between trunk and branch-2. (jing9)
 
+    HDFS-6657. Remove link to 'Legacy UI' in trunk's Namenode UI.
+    (Vinayakumar B via wheat 9)
+
 Release 2.6.0 - UNRELEASED
 
   INCOMPATIBLE CHANGES
@@ -334,6 +337,15 @@ Release 2.6.0 - UNRELEASED
     HDFS-6701. Make seed optional in NetworkTopology#sortByDistance.
     (Ashwin Shankar via wang)
 
+    HDFS-6755. There is an unnecessary sleep in the code path where
+    DFSOutputStream#close gives up its attempt to contact the namenode
+    (mitdesai21 via cmccabe)
+
+    HDFS-6750. The DataNode should use its shared memory segment to mark
+    short-circuit replicas that have been unlinked as stale (cmccabe)
+
+    HDFS-6739. Add getDatanodeStorageReport to ClientProtocol. (szetszwo)
+
   OPTIMIZATIONS
 
     HDFS-6690. Deduplicate xattr names in memory. (wang)
@@ -377,6 +389,25 @@ Release 2.6.0 - UNRELEASED
     HDFS-6731. Run "hdfs zkfc-formatZK" on a server in a non-namenode will cause
     a null pointer exception. (Masatake Iwasaki via brandonli)
 
+    HDFS-6114. Block Scan log rolling will never happen if blocks written
+    continuously leading to huge size of dncp_block_verification.log.curr
+    (vinayakumarb via cmccabe)
+
+    HDFS-6455. NFS: Exception should be added in NFS log for invalid separator in
+    nfs.exports.allowed.hosts. (Abhiraj Butala via brandonli)
+
+    HDFS-6715. Webhdfs wont fail over when it gets java.io.IOException: Namenode
+    is in startup mode. (jing9)
+
+    HDFS-5919. FileJournalManager doesn't purge empty and corrupt inprogress edits
+    files (vinayakumarb)
+
+    HDFS-6752. Avoid Address bind errors in TestDatanodeConfig#testMemlockLimit
+    (vinayakumarb)
+
+    HDFS-6749. FSNamesystem methods should call resolvePath.
+    (Charles Lamb via cnauroth)
+
 Release 2.5.0 - UNRELEASED
 
   INCOMPATIBLE CHANGES
@@ -399,6 +430,15 @@ Release 2.5.0 - UNRELEASED
     HDFS-6406. Add capability for NFS gateway to reject connections from
     unprivileged ports. (atm)
 
+    HDFS-2006. Ability to support storing extended attributes per file.
+
+    HDFS-5978. Create a tool to take fsimage and expose read-only WebHDFS API.
+    (Akira Ajisaka via wheat9)
+
+    HDFS-6278. Create HTML5-based UI for SNN. (wheat9)
+
+    HDFS-6279. Create new index page for JN / DN. (wheat9)
+
   IMPROVEMENTS
 
     HDFS-6007. Update documentation about short-circuit local reads (iwasakims
@@ -416,9 +456,6 @@ Release 2.5.0 - UNRELEASED
 
     HDFS-6158. Clean up dead code for OfflineImageViewer. (wheat9)
 
-    HDFS-5978. Create a tool to take fsimage and expose read-only WebHDFS API.
-    (Akira Ajisaka via wheat9)
-
     HDFS-6164. Remove lsr in OfflineImageViewer. (wheat9)
 
     HDFS-6167. Relocate the non-public API classes in the hdfs.client package.
@@ -446,10 +483,6 @@ Release 2.5.0 - UNRELEASED
 
     HDFS-6265. Prepare HDFS codebase for JUnit 4.11. (cnauroth)
 
-    HDFS-6278. Create HTML5-based UI for SNN. (wheat9)
-
-    HDFS-6279. Create new index page for JN / DN. (wheat9)
-
     HDFS-5693. Few NN metrics data points were collected via JMX when NN
     is under heavy load. (Ming Ma via jing9)
 
@@ -821,9 +854,6 @@ Release 2.5.0 - UNRELEASED
     HDFS-6464. Support multiple xattr.name parameters for WebHDFS getXAttrs.
     (Yi Liu via umamahesh)
 
-    HDFS-6375. Listing extended attributes with the search permission.
-    (Charles Lamb via wang)
-
     HDFS-6539. test_native_mini_dfs is skipped in hadoop-hdfs/pom.xml
     (decstery via cmccabe)
 
@@ -912,6 +942,27 @@ Release 2.5.0 - UNRELEASED
     HDFS-6703. NFS: Files can be deleted from a read-only mount
     (Srikanth Upputuri via brandonli)
 
+    HDFS-6422. getfattr in CLI doesn't throw exception or return non-0 return code 
+    when xattr doesn't exist. (Charles Lamb via umamahesh)
+
+    HDFS-6696. Name node cannot start if the path of a file under
+    construction contains ".snapshot". (wang)
+
+    HDFS-6312. WebHdfs HA failover is broken on secure clusters. 
+    (daryn via tucu)
+
+    HDFS-6618. FSNamesystem#delete drops the FSN lock between removing INodes
+    from the tree and deleting them from the inode map (kihwal via cmccabe)
+
+    HDFS-6622. Rename and AddBlock may race and produce invalid edits (kihwal
+    via cmccabe)
+
+    HDFS-6723. New NN webUI no longer displays decommissioned state for dead node.
+    (Ming Ma via wheat9)
+
+    HDFS-6717. JIRA HDFS-5804 breaks default nfs-gateway behavior for unsecured config
+    (brandonli)
+
   BREAKDOWN OF HDFS-2006 SUBTASKS AND RELATED JIRAS
 
     HDFS-6299. Protobuf for XAttr and client-side implementation. (Yi Liu via umamahesh)
@@ -981,15 +1032,6 @@ Release 2.5.0 - UNRELEASED
     HDFS-6492. Support create-time xattrs and atomically setting multiple
     xattrs. (wang)
 
-    HDFS-6312. WebHdfs HA failover is broken on secure clusters. 
-    (daryn via tucu)
-
-    HDFS-6618. FSNamesystem#delete drops the FSN lock between removing INodes
-    from the tree and deleting them from the inode map (kihwal via cmccabe)
-
-    HDFS-6622. Rename and AddBlock may race and produce invalid edits (kihwal
-    via cmccabe)
-
 Release 2.4.1 - 2014-06-23 
 
   INCOMPATIBLE CHANGES

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

@@ -31,7 +31,7 @@
 import org.apache.hadoop.hdfs.server.datanode.CachingStrategy;
 import org.apache.hadoop.hdfs.shortcircuit.ClientMmap;
 import org.apache.hadoop.hdfs.shortcircuit.ShortCircuitReplica;
-import org.apache.hadoop.hdfs.util.DirectBufferPool;
+import org.apache.hadoop.util.DirectBufferPool;
 import org.apache.hadoop.util.DataChecksum;
 
 import com.google.common.annotations.VisibleForTesting;

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

@@ -40,7 +40,7 @@
 import org.apache.hadoop.hdfs.security.token.block.BlockTokenIdentifier;
 import org.apache.hadoop.hdfs.server.datanode.BlockMetadataHeader;
 import org.apache.hadoop.hdfs.shortcircuit.ClientMmap;
-import org.apache.hadoop.hdfs.util.DirectBufferPool;
+import org.apache.hadoop.util.DirectBufferPool;
 import org.apache.hadoop.io.IOUtils;
 import org.apache.hadoop.ipc.RPC;
 import org.apache.hadoop.security.UserGroupInformation;

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

@@ -32,19 +32,21 @@
 import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_CLIENT_CACHE_DROP_BEHIND_READS;
 import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_CLIENT_CACHE_DROP_BEHIND_WRITES;
 import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_CLIENT_CACHE_READAHEAD;
-import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_CLIENT_DATANODE_RESTART_TIMEOUT_KEY;
+import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_CLIENT_CONTEXT;
+import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_CLIENT_CONTEXT_DEFAULT;
 import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_CLIENT_DATANODE_RESTART_TIMEOUT_DEFAULT;
+import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_CLIENT_DATANODE_RESTART_TIMEOUT_KEY;
 import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_CLIENT_FAILOVER_MAX_ATTEMPTS_DEFAULT;
 import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_CLIENT_FAILOVER_MAX_ATTEMPTS_KEY;
 import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_CLIENT_FAILOVER_SLEEPTIME_BASE_DEFAULT;
 import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_CLIENT_FAILOVER_SLEEPTIME_BASE_KEY;
 import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_CLIENT_FAILOVER_SLEEPTIME_MAX_DEFAULT;
 import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_CLIENT_FAILOVER_SLEEPTIME_MAX_KEY;
-import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_CLIENT_RETRY_MAX_ATTEMPTS_DEFAULT;
-import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_CLIENT_RETRY_MAX_ATTEMPTS_KEY;
 import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_CLIENT_MAX_BLOCK_ACQUIRE_FAILURES_DEFAULT;
 import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_CLIENT_MAX_BLOCK_ACQUIRE_FAILURES_KEY;
 import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_CLIENT_READ_PREFETCH_SIZE_KEY;
+import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_CLIENT_RETRY_MAX_ATTEMPTS_DEFAULT;
+import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_CLIENT_RETRY_MAX_ATTEMPTS_KEY;
 import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_CLIENT_RETRY_WINDOW_BASE;
 import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_CLIENT_SOCKET_CACHE_CAPACITY_DEFAULT;
 import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_CLIENT_SOCKET_CACHE_CAPACITY_KEY;
@@ -60,8 +62,6 @@
 import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_DATANODE_SOCKET_WRITE_TIMEOUT_KEY;
 import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_REPLICATION_DEFAULT;
 import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_REPLICATION_KEY;
-import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_CLIENT_CONTEXT;
-import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_CLIENT_CONTEXT_DEFAULT;
 
 import java.io.BufferedOutputStream;
 import java.io.DataInputStream;
@@ -91,7 +91,6 @@
 
 import javax.net.SocketFactory;
 
-import com.google.common.collect.Lists;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.apache.hadoop.classification.InterfaceAudience;
@@ -112,22 +111,22 @@
 import org.apache.hadoop.fs.MD5MD5CRC32FileChecksum;
 import org.apache.hadoop.fs.MD5MD5CRC32GzipFileChecksum;
 import org.apache.hadoop.fs.Options;
-import org.apache.hadoop.fs.XAttr;
-import org.apache.hadoop.fs.XAttrSetFlag;
 import org.apache.hadoop.fs.Options.ChecksumOpt;
 import org.apache.hadoop.fs.ParentNotDirectoryException;
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.fs.RemoteIterator;
 import org.apache.hadoop.fs.UnresolvedLinkException;
 import org.apache.hadoop.fs.VolumeId;
+import org.apache.hadoop.fs.XAttr;
+import org.apache.hadoop.fs.XAttrSetFlag;
 import org.apache.hadoop.fs.permission.AclEntry;
 import org.apache.hadoop.fs.permission.AclStatus;
 import org.apache.hadoop.fs.permission.FsPermission;
 import org.apache.hadoop.hdfs.client.HdfsDataInputStream;
 import org.apache.hadoop.hdfs.client.HdfsDataOutputStream;
-import org.apache.hadoop.hdfs.protocol.AclException;
 import org.apache.hadoop.hdfs.net.Peer;
 import org.apache.hadoop.hdfs.net.TcpPeerServer;
+import org.apache.hadoop.hdfs.protocol.AclException;
 import org.apache.hadoop.hdfs.protocol.CacheDirectiveEntry;
 import org.apache.hadoop.hdfs.protocol.CacheDirectiveInfo;
 import org.apache.hadoop.hdfs.protocol.CacheDirectiveIterator;
@@ -158,8 +157,8 @@
 import org.apache.hadoop.hdfs.protocol.datatransfer.IOStreamPair;
 import org.apache.hadoop.hdfs.protocol.datatransfer.Op;
 import org.apache.hadoop.hdfs.protocol.datatransfer.ReplaceDatanodeOnFailure;
-import org.apache.hadoop.hdfs.protocol.datatransfer.TrustedChannelResolver;
 import org.apache.hadoop.hdfs.protocol.datatransfer.Sender;
+import org.apache.hadoop.hdfs.protocol.datatransfer.TrustedChannelResolver;
 import org.apache.hadoop.hdfs.protocol.datatransfer.sasl.DataEncryptionKeyFactory;
 import org.apache.hadoop.hdfs.protocol.datatransfer.sasl.DataTransferSaslUtil;
 import org.apache.hadoop.hdfs.protocol.datatransfer.sasl.SaslDataTransferClient;
@@ -175,6 +174,7 @@
 import org.apache.hadoop.hdfs.server.datanode.CachingStrategy;
 import org.apache.hadoop.hdfs.server.namenode.NameNode;
 import org.apache.hadoop.hdfs.server.namenode.SafeModeException;
+import org.apache.hadoop.hdfs.server.protocol.DatanodeStorageReport;
 import org.apache.hadoop.io.DataOutputBuffer;
 import org.apache.hadoop.io.EnumSetWritable;
 import org.apache.hadoop.io.IOUtils;
@@ -200,6 +200,7 @@
 import com.google.common.annotations.VisibleForTesting;
 import com.google.common.base.Joiner;
 import com.google.common.base.Preconditions;
+import com.google.common.collect.Lists;
 import com.google.common.net.InetAddresses;
 
 /********************************************************
@@ -2192,6 +2193,11 @@ public DatanodeInfo[] datanodeReport(DatanodeReportType type)
     return namenode.getDatanodeReport(type);
   }
     
+  public DatanodeStorageReport[] getDatanodeStorageReport(
+      DatanodeReportType type) throws IOException {
+    return namenode.getDatanodeStorageReport(type);
+  }
+
   /**
    * Enter, leave or get safe mode.
    * 

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

@@ -2136,12 +2136,12 @@ private void completeFile(ExtendedBlock last) throws IOException {
             throw new IOException(msg);
         }
         try {
-          Thread.sleep(localTimeout);
           if (retries == 0) {
             throw new IOException("Unable to close file because the last block"
                 + " does not have enough number of replicas.");
           }
           retries--;
+          Thread.sleep(localTimeout);
           localTimeout *= 2;
           if (Time.now() - localstart > 5000) {
             DFSClient.LOG.info("Could not complete " + src + " retrying...");

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

@@ -24,6 +24,7 @@
 
 import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.classification.InterfaceStability;
+import org.apache.hadoop.fs.BatchedRemoteIterator.BatchedEntries;
 import org.apache.hadoop.fs.CacheFlag;
 import org.apache.hadoop.fs.ContentSummary;
 import org.apache.hadoop.fs.CreateFlag;
@@ -31,11 +32,10 @@
 import org.apache.hadoop.fs.FsServerDefaults;
 import org.apache.hadoop.fs.InvalidPathException;
 import org.apache.hadoop.fs.Options;
-import org.apache.hadoop.fs.XAttr;
-import org.apache.hadoop.fs.BatchedRemoteIterator.BatchedEntries;
 import org.apache.hadoop.fs.Options.Rename;
 import org.apache.hadoop.fs.ParentNotDirectoryException;
 import org.apache.hadoop.fs.UnresolvedLinkException;
+import org.apache.hadoop.fs.XAttr;
 import org.apache.hadoop.fs.XAttrSetFlag;
 import org.apache.hadoop.fs.permission.AclEntry;
 import org.apache.hadoop.fs.permission.AclStatus;
@@ -47,6 +47,7 @@
 import org.apache.hadoop.hdfs.security.token.delegation.DelegationTokenSelector;
 import org.apache.hadoop.hdfs.server.namenode.NotReplicatedYetException;
 import org.apache.hadoop.hdfs.server.namenode.SafeModeException;
+import org.apache.hadoop.hdfs.server.protocol.DatanodeStorageReport;
 import org.apache.hadoop.io.EnumSetWritable;
 import org.apache.hadoop.io.Text;
 import org.apache.hadoop.io.retry.AtMostOnce;
@@ -654,6 +655,13 @@ public void renewLease(String clientName) throws AccessControlException,
   public DatanodeInfo[] getDatanodeReport(HdfsConstants.DatanodeReportType type)
       throws IOException;
 
+  /**
+   * Get a report on the current datanode storages.
+   */
+  @Idempotent
+  public DatanodeStorageReport[] getDatanodeStorageReport(
+      HdfsConstants.DatanodeReportType type) throws IOException;
+
   /**
    * Get the block size for the given file.
    * @param filename The name of the file
@@ -1337,6 +1345,6 @@ public List<XAttr> listXAttrs(String src)
    * @param xAttr <code>XAttr</code> to remove
    * @throws IOException
    */
-  @Idempotent
+  @AtMostOnce
   public void removeXAttr(String src, XAttr xAttr) throws IOException;
 }

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocol/datatransfer/PacketReceiver.java

@@ -27,7 +27,7 @@
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.apache.hadoop.classification.InterfaceAudience;
-import org.apache.hadoop.hdfs.util.DirectBufferPool;
+import org.apache.hadoop.util.DirectBufferPool;
 import org.apache.hadoop.io.IOUtils;
 
 import com.google.common.base.Preconditions;

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocolPB/ClientNamenodeProtocolServerSideTranslatorPB.java

@@ -72,6 +72,7 @@
 import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.CreateSnapshotResponseProto;
 import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.CreateSymlinkRequestProto;
 import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.CreateSymlinkResponseProto;
+import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.DatanodeStorageReportProto;
 import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.DeleteRequestProto;
 import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.DeleteResponseProto;
 import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.DeleteSnapshotRequestProto;
@@ -93,6 +94,8 @@
 import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.GetDataEncryptionKeyResponseProto;
 import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.GetDatanodeReportRequestProto;
 import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.GetDatanodeReportResponseProto;
+import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.GetDatanodeStorageReportRequestProto;
+import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.GetDatanodeStorageReportResponseProto;
 import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.GetFileInfoRequestProto;
 import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.GetFileInfoResponseProto;
 import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.GetFileLinkInfoRequestProto;
@@ -174,7 +177,6 @@
 import org.apache.hadoop.hdfs.protocol.proto.HdfsProtos.DatanodeIDProto;
 import org.apache.hadoop.hdfs.protocol.proto.HdfsProtos.DatanodeInfoProto;
 import org.apache.hadoop.hdfs.protocol.proto.HdfsProtos.LocatedBlockProto;
-import org.apache.hadoop.hdfs.protocol.proto.XAttrProtos;
 import org.apache.hadoop.hdfs.protocol.proto.XAttrProtos.GetXAttrsRequestProto;
 import org.apache.hadoop.hdfs.protocol.proto.XAttrProtos.GetXAttrsResponseProto;
 import org.apache.hadoop.hdfs.protocol.proto.XAttrProtos.ListXAttrsRequestProto;
@@ -655,6 +657,21 @@ public GetDatanodeReportResponseProto getDatanodeReport(
     }
   }
 
+  @Override
+  public GetDatanodeStorageReportResponseProto getDatanodeStorageReport(
+      RpcController controller, GetDatanodeStorageReportRequestProto req)
+      throws ServiceException {
+    try {
+      List<DatanodeStorageReportProto> reports = PBHelper.convertDatanodeStorageReports(
+          server.getDatanodeStorageReport(PBHelper.convert(req.getType())));
+      return GetDatanodeStorageReportResponseProto.newBuilder()
+          .addAllDatanodeStorageReports(reports)
+          .build();
+    } catch (IOException e) {
+      throw new ServiceException(e);
+    }
+  }
+
   @Override
   public GetPreferredBlockSizeResponseProto getPreferredBlockSize(
       RpcController controller, GetPreferredBlockSizeRequestProto req)

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocolPB/ClientNamenodeProtocolTranslatorPB.java

@@ -94,6 +94,7 @@
 import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.GetDataEncryptionKeyRequestProto;
 import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.GetDataEncryptionKeyResponseProto;
 import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.GetDatanodeReportRequestProto;
+import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.GetDatanodeStorageReportRequestProto;
 import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.GetFileInfoRequestProto;
 import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.GetFileInfoResponseProto;
 import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.GetFileLinkInfoRequestProto;
@@ -151,6 +152,7 @@
 import org.apache.hadoop.hdfs.security.token.delegation.DelegationTokenIdentifier;
 import org.apache.hadoop.hdfs.server.namenode.NotReplicatedYetException;
 import org.apache.hadoop.hdfs.server.namenode.SafeModeException;
+import org.apache.hadoop.hdfs.server.protocol.DatanodeStorageReport;
 import org.apache.hadoop.io.EnumSetWritable;
 import org.apache.hadoop.io.Text;
 import org.apache.hadoop.ipc.ProtobufHelper;
@@ -580,6 +582,20 @@ public DatanodeInfo[] getDatanodeReport(DatanodeReportType type)
     }
   }
 
+  @Override
+  public DatanodeStorageReport[] getDatanodeStorageReport(DatanodeReportType type)
+      throws IOException {
+    final GetDatanodeStorageReportRequestProto req
+        = GetDatanodeStorageReportRequestProto.newBuilder()
+            .setType(PBHelper.convert(type)).build();
+    try {
+      return PBHelper.convertDatanodeStorageReports(
+          rpcProxy.getDatanodeStorageReport(null, req).getDatanodeStorageReportsList());
+    } catch (ServiceException e) {
+      throw ProtobufHelper.getRemoteException(e);
+    }
+  }
+
   @Override
   public long getPreferredBlockSize(String filename) throws IOException,
       UnresolvedLinkException {

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocolPB/DatanodeProtocolClientSideTranslatorPB.java

@@ -21,18 +21,13 @@
 import java.io.Closeable;
 import java.io.IOException;
 import java.net.InetSocketAddress;
-import java.util.HashMap;
 import java.util.List;
-import java.util.Map;
-import java.util.concurrent.TimeUnit;
 
 import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.classification.InterfaceStability;
 import org.apache.hadoop.conf.Configuration;
-import org.apache.hadoop.hdfs.protocol.AlreadyBeingCreatedException;
 import org.apache.hadoop.hdfs.protocol.DatanodeID;
 import org.apache.hadoop.hdfs.protocol.ExtendedBlock;
-import org.apache.hadoop.hdfs.protocol.HdfsConstants;
 import org.apache.hadoop.hdfs.protocol.LocatedBlock;
 import org.apache.hadoop.hdfs.protocol.RollingUpgradeStatus;
 import org.apache.hadoop.hdfs.protocol.proto.DatanodeProtocolProtos.BlockReceivedAndDeletedRequestProto;
@@ -51,7 +46,6 @@
 import org.apache.hadoop.hdfs.protocol.proto.DatanodeProtocolProtos.StorageBlockReportProto;
 import org.apache.hadoop.hdfs.protocol.proto.DatanodeProtocolProtos.StorageReceivedDeletedBlocksProto;
 import org.apache.hadoop.hdfs.protocol.proto.HdfsProtos.VersionRequestProto;
-import org.apache.hadoop.hdfs.server.namenode.NameNode;
 import org.apache.hadoop.hdfs.server.protocol.DatanodeCommand;
 import org.apache.hadoop.hdfs.server.protocol.DatanodeProtocol;
 import org.apache.hadoop.hdfs.server.protocol.DatanodeRegistration;
@@ -61,14 +55,10 @@
 import org.apache.hadoop.hdfs.server.protocol.StorageBlockReport;
 import org.apache.hadoop.hdfs.server.protocol.StorageReceivedDeletedBlocks;
 import org.apache.hadoop.hdfs.server.protocol.StorageReport;
-import org.apache.hadoop.io.retry.RetryPolicies;
-import org.apache.hadoop.io.retry.RetryPolicy;
-import org.apache.hadoop.io.retry.RetryProxy;
 import org.apache.hadoop.ipc.ProtobufHelper;
 import org.apache.hadoop.ipc.ProtobufRpcEngine;
 import org.apache.hadoop.ipc.ProtocolMetaInterface;
 import org.apache.hadoop.ipc.RPC;
-import org.apache.hadoop.ipc.RemoteException;
 import org.apache.hadoop.ipc.RpcClientUtil;
 import org.apache.hadoop.net.NetUtils;
 import org.apache.hadoop.security.UserGroupInformation;
@@ -137,9 +127,7 @@ public HeartbeatResponse sendHeartbeat(DatanodeRegistration registration,
         .setRegistration(PBHelper.convert(registration))
         .setXmitsInProgress(xmitsInProgress).setXceiverCount(xceiverCount)
         .setFailedVolumes(failedVolumes);
-    for (StorageReport r : reports) {
+    builder.addAllReports(PBHelper.convertStorageReports(reports));
-      builder.addReports(PBHelper.convert(r));
-    }
     if (cacheCapacity != 0) {
       builder.setCacheCapacity(cacheCapacity);
     }

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocolPB/PBHelper.java

@@ -90,6 +90,7 @@
 import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.CachePoolStatsProto;
 import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.CreateFlagProto;
 import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.DatanodeReportTypeProto;
+import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.DatanodeStorageReportProto;
 import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.GetFsStatsResponseProto;
 import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.RollingUpgradeActionProto;
 import org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos.RollingUpgradeInfoProto;
@@ -102,14 +103,11 @@
 import org.apache.hadoop.hdfs.protocol.proto.DatanodeProtocolProtos.BlockRecoveryCommandProto;
 import org.apache.hadoop.hdfs.protocol.proto.DatanodeProtocolProtos.DatanodeCommandProto;
 import org.apache.hadoop.hdfs.protocol.proto.DatanodeProtocolProtos.DatanodeRegistrationProto;
-import org.apache.hadoop.hdfs.protocol.proto.DatanodeProtocolProtos.DatanodeStorageProto;
-import org.apache.hadoop.hdfs.protocol.proto.DatanodeProtocolProtos.DatanodeStorageProto.StorageState;
 import org.apache.hadoop.hdfs.protocol.proto.DatanodeProtocolProtos.FinalizeCommandProto;
 import org.apache.hadoop.hdfs.protocol.proto.DatanodeProtocolProtos.KeyUpdateCommandProto;
 import org.apache.hadoop.hdfs.protocol.proto.DatanodeProtocolProtos.NNHAStatusHeartbeatProto;
 import org.apache.hadoop.hdfs.protocol.proto.DatanodeProtocolProtos.ReceivedDeletedBlockInfoProto;
 import org.apache.hadoop.hdfs.protocol.proto.DatanodeProtocolProtos.RegisterCommandProto;
-import org.apache.hadoop.hdfs.protocol.proto.DatanodeProtocolProtos.StorageReportProto;
 import org.apache.hadoop.hdfs.protocol.proto.HdfsProtos;
 import org.apache.hadoop.hdfs.protocol.proto.HdfsProtos.BlockKeyProto;
 import org.apache.hadoop.hdfs.protocol.proto.HdfsProtos.BlockProto;
@@ -125,6 +123,8 @@
 import org.apache.hadoop.hdfs.protocol.proto.HdfsProtos.DatanodeInfoProto.AdminState;
 import org.apache.hadoop.hdfs.protocol.proto.HdfsProtos.DatanodeInfosProto;
 import org.apache.hadoop.hdfs.protocol.proto.HdfsProtos.DatanodeLocalInfoProto;
+import org.apache.hadoop.hdfs.protocol.proto.HdfsProtos.DatanodeStorageProto;
+import org.apache.hadoop.hdfs.protocol.proto.HdfsProtos.DatanodeStorageProto.StorageState;
 import org.apache.hadoop.hdfs.protocol.proto.HdfsProtos.DirectoryListingProto;
 import org.apache.hadoop.hdfs.protocol.proto.HdfsProtos.ExportedBlockKeysProto;
 import org.apache.hadoop.hdfs.protocol.proto.HdfsProtos.ExtendedBlockProto;
@@ -149,6 +149,7 @@
 import org.apache.hadoop.hdfs.protocol.proto.HdfsProtos.SnapshottableDirectoryListingProto;
 import org.apache.hadoop.hdfs.protocol.proto.HdfsProtos.SnapshottableDirectoryStatusProto;
 import org.apache.hadoop.hdfs.protocol.proto.HdfsProtos.StorageInfoProto;
+import org.apache.hadoop.hdfs.protocol.proto.HdfsProtos.StorageReportProto;
 import org.apache.hadoop.hdfs.protocol.proto.HdfsProtos.StorageTypeProto;
 import org.apache.hadoop.hdfs.protocol.proto.HdfsProtos.StorageTypesProto;
 import org.apache.hadoop.hdfs.protocol.proto.HdfsProtos.StorageUuidsProto;
@@ -182,6 +183,7 @@
 import org.apache.hadoop.hdfs.server.protocol.DatanodeRegistration;
 import org.apache.hadoop.hdfs.server.protocol.DatanodeStorage;
 import org.apache.hadoop.hdfs.server.protocol.DatanodeStorage.State;
+import org.apache.hadoop.hdfs.server.protocol.DatanodeStorageReport;
 import org.apache.hadoop.hdfs.server.protocol.FinalizeCommand;
 import org.apache.hadoop.hdfs.server.protocol.JournalInfo;
 import org.apache.hadoop.hdfs.server.protocol.KeyUpdateCommand;
@@ -620,6 +622,41 @@ public static DatanodeInfoProto convert(DatanodeInfo info) {
     return builder.build();
   }
 
+  public static DatanodeStorageReportProto convertDatanodeStorageReport(
+      DatanodeStorageReport report) {
+    return DatanodeStorageReportProto.newBuilder()
+        .setDatanodeInfo(convert(report.getDatanodeInfo()))
+        .addAllStorageReports(convertStorageReports(report.getStorageReports()))
+        .build();
+  }
+
+  public static List<DatanodeStorageReportProto> convertDatanodeStorageReports(
+      DatanodeStorageReport[] reports) {
+    final List<DatanodeStorageReportProto> protos
+        = new ArrayList<DatanodeStorageReportProto>(reports.length);
+    for(int i = 0; i < reports.length; i++) {
+      protos.add(convertDatanodeStorageReport(reports[i]));
+    }
+    return protos;
+  }
+
+  public static DatanodeStorageReport convertDatanodeStorageReport(
+      DatanodeStorageReportProto proto) {
+    return new DatanodeStorageReport(
+        convert(proto.getDatanodeInfo()),
+        convertStorageReports(proto.getStorageReportsList()));
+  }
+
+  public static DatanodeStorageReport[] convertDatanodeStorageReports(
+      List<DatanodeStorageReportProto> protos) {
+    final DatanodeStorageReport[] reports
+        = new DatanodeStorageReport[protos.size()];
+    for(int i = 0; i < reports.length; i++) {
+      reports[i] = convertDatanodeStorageReport(protos.get(i));
+    }
+    return reports;
+  }
+
   public static AdminStates convert(AdminState adminState) {
     switch(adminState) {
     case DECOMMISSION_INPROGRESS:
@@ -1717,6 +1754,15 @@ public static StorageReport[] convertStorageReports(
     return report;
   }
 
+  public static List<StorageReportProto> convertStorageReports(StorageReport[] storages) {
+    final List<StorageReportProto> protos = new ArrayList<StorageReportProto>(
+        storages.length);
+    for(int i = 0; i < storages.length; i++) {
+      protos.add(convert(storages[i]));
+    }
+    return protos;
+  }
+
   public static JournalInfo convert(JournalInfoProto info) {
     int lv = info.hasLayoutVersion() ? info.getLayoutVersion() : 0;
     int nsID = info.hasNamespaceID() ? info.getNamespaceID() : 0;

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

@@ -259,6 +259,15 @@ DatanodeStorageInfo[] getStorageInfos() {
     }
   }
 
+  public StorageReport[] getStorageReports() {
+    final StorageReport[] reports = new StorageReport[storageMap.size()];
+    final DatanodeStorageInfo[] infos = getStorageInfos();
+    for(int i = 0; i < infos.length; i++) {
+      reports[i] = infos[i].toStorageReport();
+    }
+    return reports;
+  }
+
   boolean hasStaleStorages() {
     synchronized (storageMap) {
       for (DatanodeStorageInfo storage : storageMap.values()) {

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

@@ -292,6 +292,12 @@ public String toString() {
     return "[" + storageType + "]" + storageID + ":" + state;
   }
   
+  StorageReport toStorageReport() {
+    return new StorageReport(
+        new DatanodeStorage(storageID, state, storageType),
+        false, capacity, dfsUsed, remaining, blockPoolUsed);
+  }
+
   static Iterable<StorageType> toStorageTypes(
       final Iterable<DatanodeStorageInfo> infos) {
     return new Iterable<StorageType>() {

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

@@ -84,6 +84,10 @@ class BlockPoolSliceScanner {
   
   private final SortedSet<BlockScanInfo> blockInfoSet
       = new TreeSet<BlockScanInfo>(BlockScanInfo.LAST_SCAN_TIME_COMPARATOR);
+
+  private final SortedSet<BlockScanInfo> newBlockInfoSet =
+      new TreeSet<BlockScanInfo>(BlockScanInfo.LAST_SCAN_TIME_COMPARATOR);
+
   private final GSet<Block, BlockScanInfo> blockMap
       = new LightWeightGSet<Block, BlockScanInfo>(
           LightWeightGSet.computeCapacity(0.5, "BlockMap"));
@@ -195,7 +199,7 @@ public LinkedElement getNext() {
       BlockScanInfo info = new BlockScanInfo( block );
       info.lastScanTime = scanTime--; 
       //still keep 'info.lastScanType' to NONE.
-      addBlockInfo(info);
+      addBlockInfo(info, false);
     }
 
     RollingLogs rollingLogs = null;
@@ -222,8 +226,22 @@ private void updateBytesToScan(long len, long lastScanTime) {
     // not really required.
   }
 
-  private synchronized void addBlockInfo(BlockScanInfo info) {
+  /**
-    boolean added = blockInfoSet.add(info);
+   * Add the BlockScanInfo to sorted set of blockScanInfo
+   * @param info BlockScanInfo to be added
+   * @param isNewBlock true if the block is the new Block, false if
+   *          BlockScanInfo is being updated with new scanTime
+   */
+  private synchronized void addBlockInfo(BlockScanInfo info,
+      boolean isNewBlock) {
+    boolean added = false;
+    if (isNewBlock) {
+      // check whether the block already present
+      boolean exists = blockInfoSet.contains(info);
+      added = !exists && newBlockInfoSet.add(info);
+    } else {
+      added = blockInfoSet.add(info);
+    }
     blockMap.put(info);
     
     if (added) {
@@ -233,6 +251,9 @@ private synchronized void addBlockInfo(BlockScanInfo info) {
 
   private synchronized void delBlockInfo(BlockScanInfo info) {
     boolean exists = blockInfoSet.remove(info);
+    if (!exists){
+      exists = newBlockInfoSet.remove(info);
+    }
     blockMap.remove(info);
 
     if (exists) {
@@ -249,7 +270,7 @@ private synchronized void updateBlockInfo(LogEntry e) {
       delBlockInfo(info);
       info.lastScanTime = e.verificationTime;
       info.lastScanType = ScanType.VERIFICATION_SCAN;
-      addBlockInfo(info);
+      addBlockInfo(info, false);
     }
   }
 
@@ -275,7 +296,7 @@ synchronized void addBlock(ExtendedBlock block) {
     info = new BlockScanInfo(block.getLocalBlock());    
     info.lastScanTime = getNewBlockScanTime();
     
-    addBlockInfo(info);
+    addBlockInfo(info, true);
     adjustThrottler();
   }
   
@@ -319,7 +340,7 @@ private synchronized void updateScanStatus(BlockScanInfo info,
     info.lastScanType = type;
     info.lastScanTime = now;
     info.lastScanOk = scanOk;
-    addBlockInfo(info);
+    addBlockInfo(info, false);
         
     // Don't update meta data if the verification failed.
     if (!scanOk) {
@@ -578,7 +599,7 @@ private boolean assignInitialVerificationTimes() {
           delBlockInfo(info);        
           info.lastScanTime = lastScanTime;
           lastScanTime += verifyInterval;
-          addBlockInfo(info);
+          addBlockInfo(info, false);
         }
       }
     }
@@ -674,12 +695,21 @@ private void scan() {
       throw e;
     } finally {
       rollVerificationLogs();
+      rollNewBlocksInfo();
       if (LOG.isDebugEnabled()) {
         LOG.debug("Done scanning block pool: " + blockPoolId);
       }
     }
   }
 
+  // add new blocks to scan in next iteration
+  private synchronized void rollNewBlocksInfo() {
+    for (BlockScanInfo newBlock : newBlockInfoSet) {
+      blockInfoSet.add(newBlock);
+    }
+    newBlockInfoSet.clear();
+  }
+
   private synchronized void rollVerificationLogs() {
     if (verificationLog != null) {
       try {

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

@@ -74,7 +74,7 @@
  * DN also marks the block's slots as "unanchorable" to prevent additional 
  * clients from initiating these operations in the future.
  * 
- * The counterpart fo this class on the client is {@link DfsClientShmManager}.
+ * The counterpart of this class on the client is {@link DfsClientShmManager}.
  */
 public class ShortCircuitRegistry {
   public static final Log LOG = LogFactory.getLog(ShortCircuitRegistry.class);
@@ -218,6 +218,31 @@ public synchronized boolean processBlockMunlockRequest(
     return allowMunlock;
   }
 
+  /**
+   * Invalidate any slot associated with a blockId that we are invalidating
+   * (deleting) from this DataNode.  When a slot is invalid, the DFSClient will
+   * not use the corresponding replica for new read or mmap operations (although
+   * existing, ongoing read or mmap operations will complete.)
+   *
+   * @param blockId        The block ID.
+   */
+  public synchronized void processBlockInvalidation(ExtendedBlockId blockId) {
+    if (!enabled) return;
+    final Set<Slot> affectedSlots = slots.get(blockId);
+    if (!affectedSlots.isEmpty()) {
+      final StringBuilder bld = new StringBuilder();
+      String prefix = "";
+      bld.append("Block ").append(blockId).append(" has been invalidated.  ").
+          append("Marking short-circuit slots as invalid: ");
+      for (Slot slot : affectedSlots) {
+        slot.makeInvalid();
+        bld.append(prefix).append(slot.toString());
+        prefix = ", ";
+      }
+      LOG.info(bld.toString());
+    }
+  }
+
   public static class NewShmInfo implements Closeable {
     public final ShmId shmId;
     public final FileInputStream stream;

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

@@ -44,6 +44,7 @@
 import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.hdfs.ExtendedBlockId;
 import org.apache.hadoop.hdfs.DFSConfigKeys;
 import org.apache.hadoop.hdfs.StorageType;
 import org.apache.hadoop.hdfs.protocol.Block;
@@ -1232,8 +1233,15 @@ public void invalidate(String bpid, Block invalidBlks[]) throws IOException {
         }
         volumeMap.remove(bpid, invalidBlks[i]);
       }
+
+      // If a DFSClient has the replica in its cache of short-circuit file
+      // descriptors (and the client is using ShortCircuitShm), invalidate it.
+      datanode.getShortCircuitRegistry().processBlockInvalidation(
+                new ExtendedBlockId(invalidBlks[i].getBlockId(), bpid));
+
       // If the block is cached, start uncaching it.
       cacheManager.uncacheBlock(bpid, invalidBlks[i].getBlockId());
+
       // Delete the block asynchronously to make sure we can do it fast enough.
       // It's ok to unlink the block file before the uncache operation
       // finishes.

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

@@ -1074,10 +1074,11 @@ void logSetXAttrs(String src, List<XAttr> xAttrs, boolean toLogRpcIds) {
     logEdit(op);
   }
   
-  void logRemoveXAttrs(String src, List<XAttr> xAttrs) {
+  void logRemoveXAttrs(String src, List<XAttr> xAttrs, boolean toLogRpcIds) {
     final RemoveXAttrOp op = RemoveXAttrOp.getInstance();
     op.src = src;
     op.xAttrs = xAttrs;
+    logRpcIds(op, toLogRpcIds);
     logEdit(op);
   }
 

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

@@ -821,6 +821,10 @@ private long applyEditLogOp(FSEditLogOp op, FSDirectory fsDir,
       RemoveXAttrOp removeXAttrOp = (RemoveXAttrOp) op;
       fsDir.unprotectedRemoveXAttrs(removeXAttrOp.src,
           removeXAttrOp.xAttrs);
+      if (toAddRetryCache) {
+        fsNamesys.addCacheEntry(removeXAttrOp.rpcClientId,
+            removeXAttrOp.rpcCallId);
+      }
       break;
     }
     default:

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

@@ -3551,6 +3551,7 @@ void readFields(DataInputStream in, int logVersion) throws IOException {
       XAttrEditLogProto p = XAttrEditLogProto.parseDelimitedFrom(in);
       src = p.getSrc();
       xAttrs = PBHelper.convertXAttrs(p.getXAttrsList());
+      readRpcIds(in, logVersion);
     }
 
     @Override
@@ -3561,18 +3562,22 @@ public void writeFields(DataOutputStream out) throws IOException {
       }
       b.addAllXAttrs(PBHelper.convertXAttrProto(xAttrs));
       b.build().writeDelimitedTo(out);
+      // clientId and callId
+      writeRpcIds(rpcClientId, rpcCallId, out);
     }
 
     @Override
     protected void toXml(ContentHandler contentHandler) throws SAXException {
       XMLUtils.addSaxString(contentHandler, "SRC", src);
       appendXAttrsToXml(contentHandler, xAttrs);
+      appendRpcIdsToXml(contentHandler, rpcClientId, rpcCallId);
     }
 
     @Override
     void fromXml(Stanza st) throws InvalidXmlException {
       src = st.getValue("SRC");
       xAttrs = readXAttrsFromXml(st);
+      readRpcIdsFromXml(st);
     }
   }
   

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

@@ -614,6 +614,16 @@ private void loadFullNameINodes(long numFiles, DataInput in, Counter counter)
     INodeDirectory parentINode = fsDir.rootDir;
     for (long i = 0; i < numFiles; i++) {
       pathComponents = FSImageSerialization.readPathComponents(in);
+      for (int j=0; j < pathComponents.length; j++) {
+        byte[] newComponent = renameReservedComponentOnUpgrade
+            (pathComponents[j], getLayoutVersion());
+        if (!Arrays.equals(newComponent, pathComponents[j])) {
+          String oldPath = DFSUtil.byteArray2PathString(pathComponents);
+          pathComponents[j] = newComponent;
+          String newPath = DFSUtil.byteArray2PathString(pathComponents);
+          LOG.info("Renaming reserved path " + oldPath + " to " + newPath);
+        }
+      }
       final INode newNode = loadINode(
           pathComponents[pathComponents.length-1], false, in, counter);
 
@@ -926,6 +936,7 @@ LayoutVersion.Feature.ADD_INODE_ID, getLayoutVersion())) {
           oldnode = namesystem.dir.getInode(cons.getId()).asFile();
           inSnapshot = true;
         } else {
+          path = renameReservedPathsOnUpgrade(path, getLayoutVersion());
           final INodesInPath iip = fsDir.getLastINodeInPath(path);
           oldnode = INodeFile.valueOf(iip.getINode(0), path);
         }

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

@@ -62,6 +62,8 @@
 import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_NAMENODE_MAX_OBJECTS_DEFAULT;
 import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_NAMENODE_MAX_OBJECTS_KEY;
 import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_NAMENODE_NAME_DIR_KEY;
+import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_NAMENODE_RANDOMIZE_BLOCK_LOCATIONS_PER_BLOCK;
+import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_NAMENODE_RANDOMIZE_BLOCK_LOCATIONS_PER_BLOCK_DEFAULT;
 import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_NAMENODE_REPLICATION_MIN_DEFAULT;
 import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_NAMENODE_REPLICATION_MIN_KEY;
 import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_NAMENODE_REPL_QUEUE_THRESHOLD_PCT_KEY;
@@ -83,9 +85,6 @@
 import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_PERMISSIONS_SUPERUSERGROUP_KEY;
 import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_REPLICATION_DEFAULT;
 import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_REPLICATION_KEY;
-import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_NAMENODE_RANDOMIZE_BLOCK_LOCATIONS_PER_BLOCK;
-import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_NAMENODE_RANDOMIZE_BLOCK_LOCATIONS_PER_BLOCK_DEFAULT;
-
 import static org.apache.hadoop.util.Time.now;
 
 import java.io.BufferedWriter;
@@ -230,6 +229,7 @@
 import org.apache.hadoop.hdfs.server.namenode.web.resources.NamenodeWebHdfsMethods;
 import org.apache.hadoop.hdfs.server.protocol.DatanodeCommand;
 import org.apache.hadoop.hdfs.server.protocol.DatanodeRegistration;
+import org.apache.hadoop.hdfs.server.protocol.DatanodeStorageReport;
 import org.apache.hadoop.hdfs.server.protocol.HeartbeatResponse;
 import org.apache.hadoop.hdfs.server.protocol.NNHAStatusHeartbeat;
 import org.apache.hadoop.hdfs.server.protocol.NamenodeCommand;
@@ -3723,8 +3723,10 @@ boolean isFileClosed(String src)
       StandbyException, IOException {
     FSPermissionChecker pc = getPermissionChecker();  
     checkOperation(OperationCategory.READ);
+    byte[][] pathComponents = FSDirectory.getPathComponentsForReservedPath(src);
     readLock();
     try {
+      src = FSDirectory.resolvePath(src, pathComponents, dir);
       checkOperation(OperationCategory.READ);
       if (isPermissionEnabled) {
         checkTraverse(pc, src);
@@ -4917,6 +4919,28 @@ DatanodeInfo[] datanodeReport(final DatanodeReportType type
     }
   }
 
+  DatanodeStorageReport[] getDatanodeStorageReport(final DatanodeReportType type
+      ) throws AccessControlException, StandbyException {
+    checkSuperuserPrivilege();
+    checkOperation(OperationCategory.UNCHECKED);
+    readLock();
+    try {
+      checkOperation(OperationCategory.UNCHECKED);
+      final DatanodeManager dm = getBlockManager().getDatanodeManager();      
+      final List<DatanodeDescriptor> datanodes = dm.getDatanodeListForReport(type);
+
+      DatanodeStorageReport[] reports = new DatanodeStorageReport[datanodes.size()];
+      for (int i = 0; i < reports.length; i++) {
+        final DatanodeDescriptor d = datanodes.get(i);
+        reports[i] = new DatanodeStorageReport(new DatanodeInfo(d),
+            d.getStorageReports());
+      }
+      return reports;
+    } finally {
+      readUnlock();
+    }
+  }
+
   /**
    * Save namespace image.
    * This will save current namespace into fsimage file and empty edits file.
@@ -8186,9 +8210,11 @@ AclStatus getAclStatus(String src) throws IOException {
     nnConf.checkAclsConfigFlag();
     FSPermissionChecker pc = getPermissionChecker();
     checkOperation(OperationCategory.READ);
+    byte[][] pathComponents = FSDirectory.getPathComponentsForReservedPath(src);
     readLock();
     try {
       checkOperation(OperationCategory.READ);
+      src = FSDirectory.resolvePath(src, pathComponents, dir);
       if (isPermissionEnabled) {
         checkPermission(pc, src, false, null, null, null, null);
       }
@@ -8282,16 +8308,19 @@ List<XAttr> getXAttrs(String src, List<XAttr> xAttrs) throws IOException {
     nnConf.checkXAttrsConfigFlag();
     FSPermissionChecker pc = getPermissionChecker();
     boolean getAll = xAttrs == null || xAttrs.isEmpty();
-    List<XAttr> filteredXAttrs = null;
     if (!getAll) {
-      filteredXAttrs = XAttrPermissionFilter.filterXAttrsForApi(pc, xAttrs);
+      try {
-      if (filteredXAttrs.isEmpty()) {
+        XAttrPermissionFilter.checkPermissionForApi(pc, xAttrs);
-        return filteredXAttrs;
+      } catch (AccessControlException e) {
+        logAuditEvent(false, "getXAttrs", src);
+        throw e;
       }
     }
     checkOperation(OperationCategory.READ);
+    byte[][] pathComponents = FSDirectory.getPathComponentsForReservedPath(src);
     readLock();
     try {
+      src = FSDirectory.resolvePath(src, pathComponents, dir);
       checkOperation(OperationCategory.READ);
       if (isPermissionEnabled) {
         checkPathAccess(pc, src, FsAction.READ);
@@ -8305,15 +8334,21 @@ List<XAttr> getXAttrs(String src, List<XAttr> xAttrs) throws IOException {
         if (filteredAll == null || filteredAll.isEmpty()) {
           return null;
         }
-        List<XAttr> toGet = Lists.newArrayListWithCapacity(filteredXAttrs.size());
+        List<XAttr> toGet = Lists.newArrayListWithCapacity(xAttrs.size());
-        for (XAttr xAttr : filteredXAttrs) {
+        for (XAttr xAttr : xAttrs) {
+          boolean foundIt = false;
           for (XAttr a : filteredAll) {
             if (xAttr.getNameSpace() == a.getNameSpace()
                 && xAttr.getName().equals(a.getName())) {
               toGet.add(a);
+              foundIt = true;
               break;
             }
           }
+          if (!foundIt) {
+            throw new IOException(
+                "At least one of the attributes provided was not found.");
+          }
         }
         return toGet;
       }
@@ -8329,8 +8364,10 @@ List<XAttr> listXAttrs(String src) throws IOException {
     nnConf.checkXAttrsConfigFlag();
     final FSPermissionChecker pc = getPermissionChecker();
     checkOperation(OperationCategory.READ);
+    byte[][] pathComponents = FSDirectory.getPathComponentsForReservedPath(src);
     readLock();
     try {
+      src = FSDirectory.resolvePath(src, pathComponents, dir);
       checkOperation(OperationCategory.READ);
       if (isPermissionEnabled) {
         /* To access xattr names, you need EXECUTE in the owning directory. */
@@ -8348,16 +8385,41 @@ List<XAttr> listXAttrs(String src) throws IOException {
     }
   }
 
+  /**
+   * Remove an xattr for a file or directory.
+   *
+   * @param src
+   *          - path to remove the xattr from
+   * @param xAttr
+   *          - xAttr to remove
+   * @throws AccessControlException
+   * @throws SafeModeException
+   * @throws UnresolvedLinkException
+   * @throws IOException
+   */
   void removeXAttr(String src, XAttr xAttr) throws IOException {
-    nnConf.checkXAttrsConfigFlag();
+    CacheEntry cacheEntry = RetryCache.waitForCompletion(retryCache);
-    HdfsFileStatus resultingStat = null;
+    if (cacheEntry != null && cacheEntry.isSuccess()) {
-    FSPermissionChecker pc = getPermissionChecker();
+      return; // Return previous response
+    }
+    boolean success = false;
     try {
-      XAttrPermissionFilter.checkPermissionForApi(pc, xAttr);
+      removeXAttrInt(src, xAttr, cacheEntry != null);
+      success = true;
     } catch (AccessControlException e) {
       logAuditEvent(false, "removeXAttr", src);
       throw e;
+    } finally {
+      RetryCache.setState(cacheEntry, success);
     }
+  }
+
+  void removeXAttrInt(String src, XAttr xAttr, boolean logRetryCache)
+      throws IOException {
+    nnConf.checkXAttrsConfigFlag();
+    HdfsFileStatus resultingStat = null;
+    FSPermissionChecker pc = getPermissionChecker();
+      XAttrPermissionFilter.checkPermissionForApi(pc, xAttr);
     checkOperation(OperationCategory.WRITE);
     byte[][] pathComponents = FSDirectory.getPathComponentsForReservedPath(src);
     writeLock();
@@ -8371,12 +8433,12 @@ void removeXAttr(String src, XAttr xAttr) throws IOException {
       xAttrs.add(xAttr);
       List<XAttr> removedXAttrs = dir.removeXAttrs(src, xAttrs);
       if (removedXAttrs != null && !removedXAttrs.isEmpty()) {
-        getEditLog().logRemoveXAttrs(src, removedXAttrs);
+        getEditLog().logRemoveXAttrs(src, removedXAttrs, logRetryCache);
+      } else {
+        throw new IOException(
+            "No matching attributes found for remove operation");
       }
       resultingStat = getAuditFileInfo(src, false);
-    } catch (AccessControlException e) {
-      logAuditEvent(false, "removeXAttr", src);
-      throw e;
     } finally {
       writeUnlock();
     }

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

@@ -71,6 +71,8 @@ public class FileJournalManager implements JournalManager {
     NameNodeFile.EDITS.getName() + "_(\\d+)-(\\d+)");
   private static final Pattern EDITS_INPROGRESS_REGEX = Pattern.compile(
     NameNodeFile.EDITS_INPROGRESS.getName() + "_(\\d+)");
+  private static final Pattern EDITS_INPROGRESS_STALE_REGEX = Pattern.compile(
+      NameNodeFile.EDITS_INPROGRESS.getName() + "_(\\d+).*(\\S+)");
 
   private File currentInProgress = null;
 
@@ -162,8 +164,7 @@ public void purgeLogsOlderThan(long minTxIdToKeep)
       throws IOException {
     LOG.info("Purging logs older than " + minTxIdToKeep);
     File[] files = FileUtil.listFiles(sd.getCurrentDir());
-    List<EditLogFile> editLogs = 
+    List<EditLogFile> editLogs = matchEditLogs(files, true);
-      FileJournalManager.matchEditLogs(files);
     for (EditLogFile log : editLogs) {
       if (log.getFirstTxId() < minTxIdToKeep &&
           log.getLastTxId() < minTxIdToKeep) {
@@ -246,6 +247,11 @@ public static List<EditLogFile> matchEditLogs(File logDir) throws IOException {
   }
 
   static List<EditLogFile> matchEditLogs(File[] filesInStorage) {
+    return matchEditLogs(filesInStorage, false);
+  }
+
+  private static List<EditLogFile> matchEditLogs(File[] filesInStorage,
+      boolean forPurging) {
     List<EditLogFile> ret = Lists.newArrayList();
     for (File f : filesInStorage) {
       String name = f.getName();
@@ -256,6 +262,7 @@ static List<EditLogFile> matchEditLogs(File[] filesInStorage) {
           long startTxId = Long.parseLong(editsMatch.group(1));
           long endTxId = Long.parseLong(editsMatch.group(2));
           ret.add(new EditLogFile(f, startTxId, endTxId));
+          continue;
         } catch (NumberFormatException nfe) {
           LOG.error("Edits file " + f + " has improperly formatted " +
                     "transaction ID");
@@ -270,12 +277,30 @@ static List<EditLogFile> matchEditLogs(File[] filesInStorage) {
           long startTxId = Long.parseLong(inProgressEditsMatch.group(1));
           ret.add(
               new EditLogFile(f, startTxId, HdfsConstants.INVALID_TXID, true));
+          continue;
         } catch (NumberFormatException nfe) {
           LOG.error("In-progress edits file " + f + " has improperly " +
                     "formatted transaction ID");
           // skip
         }
       }
+      if (forPurging) {
+        // Check for in-progress stale edits
+        Matcher staleInprogressEditsMatch = EDITS_INPROGRESS_STALE_REGEX
+            .matcher(name);
+        if (staleInprogressEditsMatch.matches()) {
+          try {
+            long startTxId = Long.valueOf(staleInprogressEditsMatch.group(1));
+            ret.add(new EditLogFile(f, startTxId, HdfsConstants.INVALID_TXID,
+                true));
+            continue;
+          } catch (NumberFormatException nfe) {
+            LOG.error("In-progress stale edits file " + f + " has improperly "
+                + "formatted transaction ID");
+            // skip
+          }
+        }
+      }
     }
     return ret;
   }

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

@@ -115,6 +115,7 @@
 import org.apache.hadoop.hdfs.server.protocol.DatanodeCommand;
 import org.apache.hadoop.hdfs.server.protocol.DatanodeProtocol;
 import org.apache.hadoop.hdfs.server.protocol.DatanodeRegistration;
+import org.apache.hadoop.hdfs.server.protocol.DatanodeStorageReport;
 import org.apache.hadoop.hdfs.server.protocol.FinalizeCommand;
 import org.apache.hadoop.hdfs.server.protocol.HeartbeatResponse;
 import org.apache.hadoop.hdfs.server.protocol.NamenodeCommand;
@@ -830,11 +831,23 @@ public DatanodeInfo[] getDatanodeReport(DatanodeReportType type)
   throws IOException {
     DatanodeInfo results[] = namesystem.datanodeReport(type);
     if (results == null ) {
-      throw new IOException("Cannot find datanode report");
+      throw new IOException("Failed to get datanode report for " + type
+          + " datanodes.");
     }
     return results;
   }
     
+  @Override // ClientProtocol
+  public DatanodeStorageReport[] getDatanodeStorageReport(
+      DatanodeReportType type) throws IOException {
+    final DatanodeStorageReport[] reports = namesystem.getDatanodeStorageReport(type);
+    if (reports == null ) {
+      throw new IOException("Failed to get datanode storage report for " + type
+          + " datanodes.");
+    }
+    return reports;
+  }
+
   @Override // ClientProtocol
   public boolean setSafeMode(SafeModeAction action, boolean isChecked)
       throws IOException {

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

@@ -26,6 +26,7 @@
 import org.apache.hadoop.security.AccessControlException;
 
 import com.google.common.collect.Lists;
+import com.google.common.base.Preconditions;
 
 /**
  * There are four types of extended attributes <XAttr> defined by the
@@ -61,6 +62,18 @@ static void checkPermissionForApi(FSPermissionChecker pc, XAttr xAttr)
         + XAttrHelper.getPrefixName(xAttr));
   }
 
+  static void checkPermissionForApi(FSPermissionChecker pc,
+                                    List<XAttr> xAttrs) throws AccessControlException {
+    Preconditions.checkArgument(xAttrs != null);
+    if (xAttrs.isEmpty()) {
+      return;
+    }
+
+    for (XAttr xAttr : xAttrs) {
+      checkPermissionForApi(pc, xAttr);
+    }
+  }
+
   static List<XAttr> filterXAttrsForApi(FSPermissionChecker pc,
       List<XAttr> xAttrs) {
     assert xAttrs != null : "xAttrs can not be null";

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/web/resources/NamenodeWebHdfsMethods.java

@@ -111,6 +111,7 @@
 import org.apache.hadoop.hdfs.web.resources.XAttrSetFlagParam;
 import org.apache.hadoop.hdfs.web.resources.XAttrValueParam;
 import org.apache.hadoop.io.Text;
+import org.apache.hadoop.ipc.RetriableException;
 import org.apache.hadoop.ipc.Server;
 import org.apache.hadoop.net.NetworkTopology.InvalidTopologyException;
 import org.apache.hadoop.net.Node;
@@ -188,7 +189,7 @@ private static NamenodeProtocols getRPCServer(NameNode namenode)
       throws IOException {
      final NamenodeProtocols np = namenode.getRpcServer();
      if (np == null) {
-       throw new IOException("Namenode is in startup mode");
+       throw new RetriableException("Namenode is in startup mode");
      }
      return np;
   }

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

@@ -0,0 +1,42 @@
+/**
+ * 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.hdfs.server.protocol;
+
+import org.apache.hadoop.hdfs.protocol.DatanodeInfo;
+
+/**
+ * Class captures information of a datanode and its storages.
+ */
+public class DatanodeStorageReport {
+  final DatanodeInfo datanodeInfo;
+  final StorageReport[] storageReports;
+
+  public DatanodeStorageReport(DatanodeInfo datanodeInfo,
+      StorageReport[] storageReports) {
+    this.datanodeInfo = datanodeInfo;
+    this.storageReports = storageReports;
+  }
+
+  public DatanodeInfo getDatanodeInfo() {
+    return datanodeInfo;
+  }
+
+  public StorageReport[] getStorageReports() {
+    return storageReports;
+  }
+}

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/shortcircuit/DfsClientShm.java

@@ -32,11 +32,16 @@
  * DfsClientShm is a subclass of ShortCircuitShm which is used by the
  * DfsClient.
  * When the UNIX domain socket associated with this shared memory segment
- * closes unexpectedly, we mark the slots inside this segment as stale.
+ * closes unexpectedly, we mark the slots inside this segment as disconnected.
- * ShortCircuitReplica objects that contain stale slots are themselves stale,
+ * ShortCircuitReplica objects that contain disconnected slots are stale,
  * and will not be used to service new reads or mmap operations.
  * However, in-progress read or mmap operations will continue to proceed.
  * Once the last slot is deallocated, the segment can be safely munmapped.
+ *
+ * Slots may also become stale because the associated replica has been deleted
+ * on the DataNode.  In this case, the DataNode will clear the 'valid' bit.
+ * The client will then see these slots as stale (see
+ * #{ShortCircuitReplica#isStale}).
  */
 public class DfsClientShm extends ShortCircuitShm
     implements DomainSocketWatcher.Handler {
@@ -58,7 +63,7 @@ public class DfsClientShm extends ShortCircuitShm
    *
    * {@link DfsClientShm#handle} sets this to true.
    */
-  private boolean stale = false;
+  private boolean disconnected = false;
 
   DfsClientShm(ShmId shmId, FileInputStream stream, EndpointShmManager manager,
       DomainPeer peer) throws IOException {
@@ -76,14 +81,14 @@ public DomainPeer getPeer() {
   }
 
   /**
-   * Determine if the shared memory segment is stale.
+   * Determine if the shared memory segment is disconnected from the DataNode.
    *
    * This must be called with the DfsClientShmManager lock held.
    *
    * @return   True if the shared memory segment is stale.
    */
-  public synchronized boolean isStale() {
+  public synchronized boolean isDisconnected() {
-    return stale;
+    return disconnected;
   }
 
   /**
@@ -97,8 +102,8 @@ public synchronized boolean isStale() {
   public boolean handle(DomainSocket sock) {
     manager.unregisterShm(getShmId());
     synchronized (this) {
-      Preconditions.checkState(!stale);
+      Preconditions.checkState(!disconnected);
-      stale = true;
+      disconnected = true;
       boolean hadSlots = false;
       for (Iterator<Slot> iter = slotIterator(); iter.hasNext(); ) {
         Slot slot = iter.next();

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/shortcircuit/DfsClientShmManager.java

@@ -271,12 +271,12 @@ Slot allocSlot(DomainPeer peer, MutableBoolean usedPeer,
             loading = false;
             finishedLoading.signalAll();
           }
-          if (shm.isStale()) {
+          if (shm.isDisconnected()) {
             // If the peer closed immediately after the shared memory segment
             // was created, the DomainSocketWatcher callback might already have
-            // fired and marked the shm as stale.  In this case, we obviously
+            // fired and marked the shm as disconnected.  In this case, we
-            // don't want to add the SharedMemorySegment to our list of valid
+            // obviously don't want to add the SharedMemorySegment to our list
-            // not-full segments.
+            // of valid not-full segments.
             if (LOG.isDebugEnabled()) {
               LOG.debug(this + ": the UNIX domain socket associated with " +
                   "this short-circuit memory closed before we could make " +
@@ -299,7 +299,7 @@ Slot allocSlot(DomainPeer peer, MutableBoolean usedPeer,
     void freeSlot(Slot slot) {
       DfsClientShm shm = (DfsClientShm)slot.getShm();
       shm.unregisterSlot(slot.getSlotIdx());
-      if (shm.isStale()) {
+      if (shm.isDisconnected()) {
         // Stale shared memory segments should not be tracked here.
         Preconditions.checkState(!full.containsKey(shm.getShmId()));
         Preconditions.checkState(!notFull.containsKey(shm.getShmId()));

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/shortcircuit/ShortCircuitShm.java

@@ -306,6 +306,13 @@ public int getSlotIdx() {
           (slotAddress - baseAddress) / BYTES_PER_SLOT);
     }
 
+    /**
+     * Clear the slot.
+     */
+    void clear() {
+      unsafe.putLongVolatile(null, this.slotAddress, 0);
+    }
+
     private boolean isSet(long flag) {
       long prev = unsafe.getLongVolatile(null, this.slotAddress);
       return (prev & flag) != 0;
@@ -535,6 +542,7 @@ synchronized public final Slot allocAndRegisterSlot(
     }
     allocatedSlots.set(idx, true);
     Slot slot = new Slot(calculateSlotAddress(idx), blockId);
+    slot.clear();
     slot.makeValid();
     slots[idx] = slot;
     if (LOG.isTraceEnabled()) {
@@ -583,7 +591,7 @@ synchronized public final Slot registerSlot(int slotIdx,
     Slot slot = new Slot(calculateSlotAddress(slotIdx), blockId);
     if (!slot.isValid()) {
       throw new InvalidRequestException(this + ": slot " + slotIdx +
-          " has not been allocated.");
+          " is not marked as valid.");
     }
     slots[slotIdx] = slot;
     allocatedSlots.set(slotIdx, true);

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/web/resources/XAttrNameParam.java

@@ -26,7 +26,7 @@ public class XAttrNameParam extends StringParam {
   public static final String DEFAULT = "";
   
   private static Domain DOMAIN = new Domain(NAME,
-      Pattern.compile("^(user\\.|trusted\\.|system\\.|security\\.).+"));
+      Pattern.compile(".*"));
   
   public XAttrNameParam(final String str) {
     super(DOMAIN, str == null || str.equals(DEFAULT) ? null : str);

hadoop-hdfs-project/hadoop-hdfs/src/main/proto/ClientNamenodeProtocol.proto

@@ -281,6 +281,19 @@ message GetDatanodeReportResponseProto {
   repeated DatanodeInfoProto di = 1;
 }
 
+message GetDatanodeStorageReportRequestProto {
+  required DatanodeReportTypeProto type = 1;
+}
+
+message DatanodeStorageReportProto {
+  required DatanodeInfoProto datanodeInfo = 1;
+  repeated StorageReportProto storageReports = 2;
+}
+
+message GetDatanodeStorageReportResponseProto {
+  repeated DatanodeStorageReportProto datanodeStorageReports = 1;
+}
+
 message GetPreferredBlockSizeRequestProto {
   required string filename = 1;
 }
@@ -672,6 +685,8 @@ service ClientNamenodeProtocol {
   rpc getFsStats(GetFsStatusRequestProto) returns(GetFsStatsResponseProto);
   rpc getDatanodeReport(GetDatanodeReportRequestProto)
       returns(GetDatanodeReportResponseProto);
+  rpc getDatanodeStorageReport(GetDatanodeStorageReportRequestProto)
+      returns(GetDatanodeStorageReportResponseProto);
   rpc getPreferredBlockSize(GetPreferredBlockSizeRequestProto)
       returns(GetPreferredBlockSizeResponseProto);
   rpc setSafeMode(SetSafeModeRequestProto)

hadoop-hdfs-project/hadoop-hdfs/src/main/proto/DatanodeProtocol.proto

@@ -44,20 +44,6 @@ message DatanodeRegistrationProto {
   required string softwareVersion = 4;        // Software version of the DN, e.g. "2.0.0"
 }
 
-/**
- * Represents a storage available on the datanode
- */
-message DatanodeStorageProto {
-  enum StorageState {
-    NORMAL = 0;
-    READ_ONLY_SHARED = 1;
-  }
-
-  required string storageUuid = 1;
-  optional StorageState state = 2 [default = NORMAL];
-  optional StorageTypeProto storageType = 3 [default = DISK];
-}
-
 /**
  * Commands sent from namenode to the datanodes
  */
@@ -196,16 +182,6 @@ message HeartbeatRequestProto {
   optional uint64 cacheUsed = 7 [default = 0 ];
 }
 
-message StorageReportProto {
-  required string storageUuid = 1 [ deprecated = true ];
-  optional bool failed = 2 [ default = false ];
-  optional uint64 capacity = 3 [ default = 0 ];
-  optional uint64 dfsUsed = 4 [ default = 0 ];
-  optional uint64 remaining = 5 [ default = 0 ];
-  optional uint64 blockPoolUsed = 6 [ default = 0 ];
-  optional DatanodeStorageProto storage = 7; // supersedes StorageUuid
-}
-
 /**
  * state - State the NN is in when returning response to the DN
  * txid - Highest transaction ID this NN has seen

hadoop-hdfs-project/hadoop-hdfs/src/main/proto/hdfs.proto

@@ -99,6 +99,30 @@ message DatanodeInfoProto {
   optional uint64 cacheUsed = 12 [default = 0];
 }
 
+/**
+ * Represents a storage available on the datanode
+ */
+message DatanodeStorageProto {
+  enum StorageState {
+    NORMAL = 0;
+    READ_ONLY_SHARED = 1;
+  }
+
+  required string storageUuid = 1;
+  optional StorageState state = 2 [default = NORMAL];
+  optional StorageTypeProto storageType = 3 [default = DISK];
+}
+
+message StorageReportProto {
+  required string storageUuid = 1 [ deprecated = true ];
+  optional bool failed = 2 [ default = false ];
+  optional uint64 capacity = 3 [ default = 0 ];
+  optional uint64 dfsUsed = 4 [ default = 0 ];
+  optional uint64 remaining = 5 [ default = 0 ];
+  optional uint64 blockPoolUsed = 6 [ default = 0 ];
+  optional DatanodeStorageProto storage = 7; // supersedes StorageUuid
+}
+
 /**
  * Summary of a file or directory
  */

hadoop-hdfs-project/hadoop-hdfs/src/main/webapps/hdfs/dfshealth.html

@@ -66,7 +66,6 @@
 <div class="row">
   <hr />
   <div class="col-xs-2"><p>Hadoop, 2014.</p></div>
-  <div class="col-xs-1 pull-right"><a style="color: #ddd" href="dfshealth.jsp">Legacy UI</a></div>
 </div>
 </div>
 
@@ -283,7 +282,7 @@
   <tr class="danger">
     <td>{name} ({xferaddr})</td>
     <td>{lastContact}</td>
-    <td>Dead{?decomissioned}, Decomissioned{/decomissioned}</td>
+    <td>Dead{?decommissioned}, Decommissioned{/decommissioned}</td>
     <td>-</td>
     <td>-</td>
     <td>-</td>

hadoop-hdfs-project/hadoop-hdfs/src/main/webapps/hdfs/index.html

@@ -18,18 +18,7 @@
     "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
 <html xmlns="http://www.w3.org/1999/xhtml">
 <head>
-<meta http-equiv="REFRESH" content="1;url=dfshealth.jsp" />
+<meta http-equiv="REFRESH" content="0;url=dfshealth.html" />
 <title>Hadoop Administration</title>
 </head>
-<body>
-<script type="text/javascript">
-//<![CDATA[
-window.location.href='dfshealth.html';
-//]]>
-</script>
-<h1>Hadoop Administration</h1>
-<ul>
-<li><a href="dfshealth.jsp">DFS Health/Status</a></li>
-</ul>
-</body>
 </html>

hadoop-hdfs-project/hadoop-hdfs/src/main/webapps/secondary/index.html

@@ -21,15 +21,4 @@
   <meta http-equiv="REFRESH" content="0;url=status.html" />
   <title>Hadoop Administration</title>
 </head>
-<body>
-<script type="text/javascript">
-//<![CDATA[
-window.location.href='status.html';
-//]]>
-</script>
-<h1>Hadoop Administration</h1>
-<ul>
-  <li><a href="status.jsp">Status</a></li>
-</ul>
-</body>
 </html>

hadoop-hdfs-project/hadoop-hdfs/src/site/apt/HdfsNfsGateway.apt.vm

@@ -44,10 +44,13 @@ HDFS NFS Gateway
 
 * {Configuration}
 
-   The user running the NFS-gateway must be able to proxy all the users using the NFS mounts. 
+   The NFS-gateway uses proxy user to proxy all the users accessing the NFS mounts. 
-   For instance, if user 'nfsserver' is running the gateway, and users belonging to the groups 'nfs-users1'
+   In non-secure mode, the user running the gateway is the proxy user, while in secure mode the
-   and 'nfs-users2' use the NFS mounts, then in core-site.xml of the namenode, the following must be set
+   user in Kerberos keytab is the proxy user. Suppose the proxy user is 'nfsserver'
-   (NOTE: replace 'nfsserver' with the user name starting the gateway in your cluster):
+   and users belonging to the groups 'nfs-users1'
+   and 'nfs-users2' use the NFS mounts, then in core-site.xml of the NameNode, the following
+   two properities must be set and only NameNode needs restart after the configuration change
+   (NOTE: replace the string 'nfsserver' with the proxy user name in your cluster):
 
 ----
 <property>
@@ -72,7 +75,9 @@ HDFS NFS Gateway
 ----
 
    The above are the only required configuration for the NFS gateway in non-secure mode. For Kerberized
-   hadoop clusters, the following configurations need to be added to hdfs-site.xml:
+   hadoop clusters, the following configurations need to be added to hdfs-site.xml for the gateway (NOTE: replace 
+   string "nfsserver" with the proxy user name and ensure the user contained in the keytab is
+   also the same proxy user):
 
 ----
   <property>
@@ -88,6 +93,8 @@ HDFS NFS Gateway
   </property>
 ----
   
+   The rest of the NFS gateway configurations are optional for both secure and non-secure mode.
+
    The AIX NFS client has a {{{https://issues.apache.org/jira/browse/HDFS-6549}few known issues}}
    that prevent it from working correctly by default with the HDFS NFS
    Gateway. If you want to be able to access the HDFS NFS Gateway from AIX, you
@@ -108,7 +115,7 @@ HDFS NFS Gateway
    have been committed.
 
    It's strongly recommended for the users to update a few configuration properties based on their use
-   cases. All the related configuration properties can be added or updated in hdfs-site.xml.
+   cases. All the following configuration properties can be added or updated in hdfs-site.xml.
   
    * If the client mounts the export with access time update allowed, make sure the following 
     property is not disabled in the configuration file. Only NameNode needs to restart after 
@@ -145,36 +152,6 @@ HDFS NFS Gateway
   </property>
 ---- 
 
-   * For optimal performance, it is recommended that rtmax be updated to
-     1MB. However, note that this 1MB is a per client allocation, and not
-     from a shared memory pool, and therefore a larger value may adversely 
-     affect small reads, consuming a lot of memory. The maximum value of 
-     this property is 1MB.
-
-----
-<property>
-  <name>nfs.rtmax</name>
-  <value>1048576</value>
-  <description>This is the maximum size in bytes of a READ request
-    supported by the NFS gateway. If you change this, make sure you
-    also update the nfs mount's rsize(add rsize= # of bytes to the 
-    mount directive).
-  </description>
-</property>
-----
-
-----
-<property>
-  <name>nfs.wtmax</name>
-  <value>65536</value>
-  <description>This is the maximum size in bytes of a WRITE request
-    supported by the NFS gateway. If you change this, make sure you
-    also update the nfs mount's wsize(add wsize= # of bytes to the 
-    mount directive).
-  </description>
-</property>
-----
-
   * By default, the export can be mounted by any client. To better control the access,
     users can update the following property. The value string contains machine name and
     access privilege, separated by whitespace
@@ -238,8 +215,10 @@ HDFS NFS Gateway
 
    [[3]] Start mountd and nfsd.
    
-     No root privileges are required for this command. However, ensure that the user starting
+     No root privileges are required for this command. In non-secure mode, the NFS gateway
-     the Hadoop cluster and the user starting the NFS gateway are same.
+     should be started by the proxy user mentioned at the beginning of this user guide. 
+     While in secure mode, any user can start NFS gateway 
+     as long as the user has read access to the Kerberos keytab defined in "nfs.keytab.file".
 
 -------------------------
      hadoop nfs3
@@ -339,7 +318,10 @@ HDFS NFS Gateway
 -------------------------------------------------------------------
 
   Then the users can access HDFS as part of the local file system except that, 
-  hard link and random write are not supported yet.
+  hard link and random write are not supported yet. To optimize the performance
+  of large file I/O, one can increase the NFS transfer size(rsize and wsize) during mount.
+  By default, NFS gateway supports 1MB as the maximum transfer size. For larger data
+  transfer size, one needs to update "nfs.rtmax" and "nfs.rtmax" in hdfs-site.xml.
 
 * {Allow mounts from unprivileged clients}
 

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestDFSShell.java

@@ -2653,6 +2653,75 @@ public Object run() throws Exception {
     }
   }
 
+  /*
+   * 1. Test that CLI throws an exception and returns non-0 when user does
+   * not have permission to read an xattr.
+   * 2. Test that CLI throws an exception and returns non-0 when a non-existent
+   * xattr is requested.
+   */
+  @Test (timeout = 120000)
+  public void testGetFAttrErrors() throws Exception {
+    final UserGroupInformation user = UserGroupInformation.
+        createUserForTesting("user", new String[] {"mygroup"});
+    MiniDFSCluster cluster = null;
+    PrintStream bakErr = null;
+    try {
+      final Configuration conf = new HdfsConfiguration();
+      cluster = new MiniDFSCluster.Builder(conf).numDataNodes(1).build();
+      cluster.waitActive();
+
+      final FileSystem fs = cluster.getFileSystem();
+      final Path p = new Path("/foo");
+      fs.mkdirs(p);
+      bakErr = System.err;
+
+      final FsShell fshell = new FsShell(conf);
+      final ByteArrayOutputStream out = new ByteArrayOutputStream();
+      System.setErr(new PrintStream(out));
+
+      // No permission for "other".
+      fs.setPermission(p, new FsPermission((short) 0700));
+
+      {
+        final int ret = ToolRunner.run(fshell, new String[] {
+            "-setfattr", "-n", "user.a1", "-v", "1234", "/foo"});
+        assertEquals("Returned should be 0", 0, ret);
+        out.reset();
+      }
+
+      user.doAs(new PrivilegedExceptionAction<Object>() {
+          @Override
+          public Object run() throws Exception {
+            int ret = ToolRunner.run(fshell, new String[] {
+                "-getfattr", "-n", "user.a1", "/foo"});
+            String str = out.toString();
+            assertTrue("xattr value was incorrectly returned",
+                str.indexOf("1234") == -1);
+            out.reset();
+            return null;
+          }
+        });
+
+      {
+        final int ret = ToolRunner.run(fshell, new String[]{
+            "-getfattr", "-n", "user.nonexistent", "/foo"});
+        String str = out.toString();
+        assertTrue("xattr value was incorrectly returned",
+          str.indexOf(
+              "getfattr: At least one of the attributes provided was not found")
+               >= 0);
+        out.reset();
+      }
+    } finally {
+      if (bakErr != null) {
+        System.setErr(bakErr);
+      }
+      if (cluster != null) {
+        cluster.shutdown();
+      }
+    }
+  }
+
   /**
    * Test that the server trash configuration is respected when
    * the client configuration is not set.

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestDFSUpgradeFromImage.java

@@ -70,6 +70,9 @@ public class TestDFSUpgradeFromImage {
   private static final String HADOOP_DFS_DIR_TXT = "hadoop-dfs-dir.txt";
   private static final String HADOOP22_IMAGE = "hadoop-22-dfs-dir.tgz";
   private static final String HADOOP1_BBW_IMAGE = "hadoop1-bbw.tgz";
+  private static final String HADOOP1_RESERVED_IMAGE = "hadoop-1-reserved.tgz";
+  private static final String HADOOP023_RESERVED_IMAGE =
+      "hadoop-0.23-reserved.tgz";
   private static final String HADOOP2_RESERVED_IMAGE = "hadoop-2-reserved.tgz";
 
   private static class ReferenceFileInfo {
@@ -325,6 +328,140 @@ public void testUpgradeFromCorruptRel22Image() throws IOException {
     }
   }
 
+  /**
+   * Test upgrade from a branch-1.2 image with reserved paths
+   */
+  @Test
+  public void testUpgradeFromRel1ReservedImage() throws Exception {
+    unpackStorage(HADOOP1_RESERVED_IMAGE);
+    MiniDFSCluster cluster = null;
+    // Try it once without setting the upgrade flag to ensure it fails
+    final Configuration conf = new Configuration();
+    // Try it again with a custom rename string
+    try {
+      FSImageFormat.setRenameReservedPairs(
+          ".snapshot=.user-snapshot," +
+              ".reserved=.my-reserved");
+      cluster =
+          new MiniDFSCluster.Builder(conf)
+              .format(false)
+              .startupOption(StartupOption.UPGRADE)
+              .numDataNodes(0).build();
+      DistributedFileSystem dfs = cluster.getFileSystem();
+      // Make sure the paths were renamed as expected
+      // Also check that paths are present after a restart, checks that the
+      // upgraded fsimage has the same state.
+      final String[] expected = new String[] {
+          "/.my-reserved",
+          "/.user-snapshot",
+          "/.user-snapshot/.user-snapshot",
+          "/.user-snapshot/open",
+          "/dir1",
+          "/dir1/.user-snapshot",
+          "/dir2",
+          "/dir2/.user-snapshot",
+          "/user",
+          "/user/andrew",
+          "/user/andrew/.user-snapshot",
+      };
+      for (int i=0; i<2; i++) {
+        // Restart the second time through this loop
+        if (i==1) {
+          cluster.finalizeCluster(conf);
+          cluster.restartNameNode(true);
+        }
+        ArrayList<Path> toList = new ArrayList<Path>();
+        toList.add(new Path("/"));
+        ArrayList<String> found = new ArrayList<String>();
+        while (!toList.isEmpty()) {
+          Path p = toList.remove(0);
+          FileStatus[] statuses = dfs.listStatus(p);
+          for (FileStatus status: statuses) {
+            final String path = status.getPath().toUri().getPath();
+            System.out.println("Found path " + path);
+            found.add(path);
+            if (status.isDirectory()) {
+              toList.add(status.getPath());
+            }
+          }
+        }
+        for (String s: expected) {
+          assertTrue("Did not find expected path " + s, found.contains(s));
+        }
+        assertEquals("Found an unexpected path while listing filesystem",
+            found.size(), expected.length);
+      }
+    } finally {
+      if (cluster != null) {
+        cluster.shutdown();
+      }
+    }
+  }
+
+  /**
+   * Test upgrade from a 0.23.11 image with reserved paths
+   */
+  @Test
+  public void testUpgradeFromRel023ReservedImage() throws Exception {
+    unpackStorage(HADOOP023_RESERVED_IMAGE);
+    MiniDFSCluster cluster = null;
+    // Try it once without setting the upgrade flag to ensure it fails
+    final Configuration conf = new Configuration();
+    // Try it again with a custom rename string
+    try {
+      FSImageFormat.setRenameReservedPairs(
+          ".snapshot=.user-snapshot," +
+              ".reserved=.my-reserved");
+      cluster =
+          new MiniDFSCluster.Builder(conf)
+              .format(false)
+              .startupOption(StartupOption.UPGRADE)
+              .numDataNodes(0).build();
+      DistributedFileSystem dfs = cluster.getFileSystem();
+      // Make sure the paths were renamed as expected
+      // Also check that paths are present after a restart, checks that the
+      // upgraded fsimage has the same state.
+      final String[] expected = new String[] {
+          "/.user-snapshot",
+          "/dir1",
+          "/dir1/.user-snapshot",
+          "/dir2",
+          "/dir2/.user-snapshot"
+      };
+      for (int i=0; i<2; i++) {
+        // Restart the second time through this loop
+        if (i==1) {
+          cluster.finalizeCluster(conf);
+          cluster.restartNameNode(true);
+        }
+        ArrayList<Path> toList = new ArrayList<Path>();
+        toList.add(new Path("/"));
+        ArrayList<String> found = new ArrayList<String>();
+        while (!toList.isEmpty()) {
+          Path p = toList.remove(0);
+          FileStatus[] statuses = dfs.listStatus(p);
+          for (FileStatus status: statuses) {
+            final String path = status.getPath().toUri().getPath();
+            System.out.println("Found path " + path);
+            found.add(path);
+            if (status.isDirectory()) {
+              toList.add(status.getPath());
+            }
+          }
+        }
+        for (String s: expected) {
+          assertTrue("Did not find expected path " + s, found.contains(s));
+        }
+        assertEquals("Found an unexpected path while listing filesystem",
+            found.size(), expected.length);
+      }
+    } finally {
+      if (cluster != null) {
+        cluster.shutdown();
+      }
+    }
+  }
+
   /**
    * Test upgrade from 2.0 image with a variety of .snapshot and .reserved
    * paths to test renaming on upgrade

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestDatanodeConfig.java

@@ -53,6 +53,8 @@ public static void setUp() throws Exception {
     Configuration conf = new HdfsConfiguration();
     conf.setInt(DFSConfigKeys.DFS_DATANODE_HTTPS_PORT_KEY, 0);
     conf.set(DFSConfigKeys.DFS_DATANODE_ADDRESS_KEY, "localhost:0");
+    conf.set(DFSConfigKeys.DFS_DATANODE_IPC_ADDRESS_KEY, "localhost:0");
+    conf.set(DFSConfigKeys.DFS_DATANODE_HTTP_ADDRESS_KEY, "localhost:0");
     cluster = new MiniDFSCluster.Builder(conf).numDataNodes(0).build();
     cluster.waitActive();
   }

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestDatanodeReport.java

@@ -21,19 +21,26 @@
 import static org.apache.hadoop.test.MetricsAsserts.getMetrics;
 import static org.junit.Assert.assertEquals;
 
-import java.net.InetSocketAddress;
+import java.io.IOException;
-import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Comparator;
+import java.util.List;
 
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.hdfs.protocol.DatanodeInfo;
 import org.apache.hadoop.hdfs.protocol.HdfsConstants.DatanodeReportType;
 import org.apache.hadoop.hdfs.server.datanode.DataNode;
+import org.apache.hadoop.hdfs.server.protocol.DatanodeStorageReport;
+import org.apache.hadoop.hdfs.server.protocol.StorageReport;
 import org.junit.Test;
 
 /**
  * This test ensures the all types of data node report work correctly.
  */
 public class TestDatanodeReport {
+  static final Log LOG = LogFactory.getLog(TestDatanodeReport.class);
   final static private Configuration conf = new HdfsConfiguration();
   final static private int NUM_OF_DATANODES = 4;
     
@@ -50,20 +57,18 @@ public void testDatanodeReport() throws Exception {
     try {
       //wait until the cluster is up
       cluster.waitActive();
+      final String bpid = cluster.getNamesystem().getBlockPoolId();
+      final List<DataNode> datanodes = cluster.getDataNodes();
+      final DFSClient client = cluster.getFileSystem().dfs;
 
-      InetSocketAddress addr = new InetSocketAddress("localhost",
+      assertReports(NUM_OF_DATANODES, DatanodeReportType.ALL, client, datanodes, bpid);
-          cluster.getNameNodePort());
+      assertReports(NUM_OF_DATANODES, DatanodeReportType.LIVE, client, datanodes, bpid);
-      DFSClient client = new DFSClient(addr, conf);
+      assertReports(0, DatanodeReportType.DEAD, client, datanodes, bpid);
-
-      assertEquals(client.datanodeReport(DatanodeReportType.ALL).length,
-                   NUM_OF_DATANODES);
-      assertEquals(client.datanodeReport(DatanodeReportType.LIVE).length,
-                   NUM_OF_DATANODES);
-      assertEquals(client.datanodeReport(DatanodeReportType.DEAD).length, 0);
 
       // bring down one datanode
-      ArrayList<DataNode> datanodes = cluster.getDataNodes();
+      final DataNode last = datanodes.get(datanodes.size() - 1);
-      datanodes.remove(datanodes.size()-1).shutdown();
+      LOG.info("XXX shutdown datanode " + last.getDatanodeUuid());
+      last.shutdown();
 
       DatanodeInfo[] nodeInfo = client.datanodeReport(DatanodeReportType.DEAD);
       while (nodeInfo.length != 1) {
@@ -74,10 +79,9 @@ public void testDatanodeReport() throws Exception {
         nodeInfo = client.datanodeReport(DatanodeReportType.DEAD);
       }
 
-      assertEquals(client.datanodeReport(DatanodeReportType.LIVE).length,
+      assertReports(NUM_OF_DATANODES, DatanodeReportType.ALL, client, datanodes, null);
-                   NUM_OF_DATANODES-1);
+      assertReports(NUM_OF_DATANODES - 1, DatanodeReportType.LIVE, client, datanodes, null);
-      assertEquals(client.datanodeReport(DatanodeReportType.ALL).length,
+      assertReports(1, DatanodeReportType.DEAD, client, datanodes, null);
-                   NUM_OF_DATANODES);
 
       Thread.sleep(5000);
       assertGauge("ExpiredHeartbeats", 1, getMetrics("FSNamesystem"));
@@ -86,10 +90,48 @@ public void testDatanodeReport() throws Exception {
     }
   }
   
-  public static void main(String[] args) throws Exception {
+  final static Comparator<StorageReport> CMP = new Comparator<StorageReport>() {
-    new TestDatanodeReport().testDatanodeReport();
+    @Override
+    public int compare(StorageReport left, StorageReport right) {
+      return left.getStorage().getStorageID().compareTo(
+            right.getStorage().getStorageID());
+    }
+  };
+
+  static void assertReports(int numDatanodes, DatanodeReportType type,
+      DFSClient client, List<DataNode> datanodes, String bpid) throws IOException {
+    final DatanodeInfo[] infos = client.datanodeReport(type);
+    assertEquals(numDatanodes, infos.length);
+    final DatanodeStorageReport[] reports = client.getDatanodeStorageReport(type);
+    assertEquals(numDatanodes, reports.length);
+    
+    for(int i = 0; i < infos.length; i++) {
+      assertEquals(infos[i], reports[i].getDatanodeInfo());
+      
+      final DataNode d = findDatanode(infos[i].getDatanodeUuid(), datanodes);
+      if (bpid != null) {
+        //check storage
+        final StorageReport[] computed = reports[i].getStorageReports();
+        Arrays.sort(computed, CMP);
+        final StorageReport[] expected = d.getFSDataset().getStorageReports(bpid);
+        Arrays.sort(expected, CMP);
+  
+        assertEquals(expected.length, computed.length);
+        for(int j = 0; j < expected.length; j++) {
+          assertEquals(expected[j].getStorage().getStorageID(),
+                       computed[j].getStorage().getStorageID());
+        }
+      }
+    }
   }
   
+  static DataNode findDatanode(String id, List<DataNode> datanodes) {
+    for(DataNode d : datanodes) {
+      if (d.getDatanodeUuid().equals(id)) {
+        return d;
+      }
+    }
+    throw new IllegalStateException("Datnode " + id + " not in datanode list: "
+        + datanodes);
+  }
 }
-
-

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/protocolPB/TestPBHelper.java

@@ -31,25 +31,25 @@
 import org.apache.hadoop.fs.permission.AclEntryType;
 import org.apache.hadoop.fs.permission.AclStatus;
 import org.apache.hadoop.fs.permission.FsAction;
-import org.apache.hadoop.hdfs.StorageType;
 import org.apache.hadoop.hdfs.DFSTestUtil;
+import org.apache.hadoop.hdfs.StorageType;
 import org.apache.hadoop.hdfs.protocol.Block;
 import org.apache.hadoop.hdfs.protocol.DatanodeID;
 import org.apache.hadoop.hdfs.protocol.DatanodeInfo;
 import org.apache.hadoop.hdfs.protocol.DatanodeInfo.AdminStates;
 import org.apache.hadoop.hdfs.protocol.ExtendedBlock;
 import org.apache.hadoop.hdfs.protocol.LocatedBlock;
-import org.apache.hadoop.hdfs.protocol.proto.HdfsProtos;
 import org.apache.hadoop.hdfs.protocol.proto.DatanodeProtocolProtos.BlockCommandProto;
 import org.apache.hadoop.hdfs.protocol.proto.DatanodeProtocolProtos.BlockRecoveryCommandProto;
 import org.apache.hadoop.hdfs.protocol.proto.DatanodeProtocolProtos.DatanodeRegistrationProto;
-import org.apache.hadoop.hdfs.protocol.proto.DatanodeProtocolProtos.DatanodeStorageProto;
+import org.apache.hadoop.hdfs.protocol.proto.HdfsProtos;
 import org.apache.hadoop.hdfs.protocol.proto.HdfsProtos.BlockKeyProto;
 import org.apache.hadoop.hdfs.protocol.proto.HdfsProtos.BlockProto;
 import org.apache.hadoop.hdfs.protocol.proto.HdfsProtos.BlockWithLocationsProto;
 import org.apache.hadoop.hdfs.protocol.proto.HdfsProtos.BlocksWithLocationsProto;
 import org.apache.hadoop.hdfs.protocol.proto.HdfsProtos.CheckpointSignatureProto;
 import org.apache.hadoop.hdfs.protocol.proto.HdfsProtos.DatanodeIDProto;
+import org.apache.hadoop.hdfs.protocol.proto.HdfsProtos.DatanodeStorageProto;
 import org.apache.hadoop.hdfs.protocol.proto.HdfsProtos.ExportedBlockKeysProto;
 import org.apache.hadoop.hdfs.protocol.proto.HdfsProtos.ExtendedBlockProto;
 import org.apache.hadoop.hdfs.protocol.proto.HdfsProtos.LocatedBlockProto;
@@ -67,9 +67,18 @@
 import org.apache.hadoop.hdfs.server.common.HdfsServerConstants.NodeType;
 import org.apache.hadoop.hdfs.server.common.StorageInfo;
 import org.apache.hadoop.hdfs.server.namenode.CheckpointSignature;
-import org.apache.hadoop.hdfs.server.protocol.*;
+import org.apache.hadoop.hdfs.server.protocol.BlockCommand;
+import org.apache.hadoop.hdfs.server.protocol.BlockRecoveryCommand;
 import org.apache.hadoop.hdfs.server.protocol.BlockRecoveryCommand.RecoveringBlock;
+import org.apache.hadoop.hdfs.server.protocol.BlocksWithLocations;
 import org.apache.hadoop.hdfs.server.protocol.BlocksWithLocations.BlockWithLocations;
+import org.apache.hadoop.hdfs.server.protocol.DatanodeProtocol;
+import org.apache.hadoop.hdfs.server.protocol.DatanodeRegistration;
+import org.apache.hadoop.hdfs.server.protocol.DatanodeStorage;
+import org.apache.hadoop.hdfs.server.protocol.NamenodeRegistration;
+import org.apache.hadoop.hdfs.server.protocol.NamespaceInfo;
+import org.apache.hadoop.hdfs.server.protocol.RemoteEditLog;
+import org.apache.hadoop.hdfs.server.protocol.RemoteEditLogManifest;
 import org.apache.hadoop.io.Text;
 import org.apache.hadoop.security.proto.SecurityProtos.TokenProto;
 import org.apache.hadoop.security.token.Token;

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/FSXAttrBaseTest.java

@@ -19,7 +19,6 @@
 
 import java.io.FileNotFoundException;
 import java.io.IOException;
-import java.io.FileNotFoundException;
 import java.security.PrivilegedExceptionAction;
 import java.util.EnumSet;
 import java.util.List;
@@ -46,6 +45,7 @@
 import static org.apache.hadoop.fs.permission.FsAction.ALL;
 import static org.apache.hadoop.fs.permission.FsAction.READ;
 import static org.apache.hadoop.hdfs.server.namenode.AclTestHelpers.aclEntry;
+import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertTrue;
 import static org.junit.Assert.fail;
 import org.junit.After;
@@ -261,11 +261,12 @@ public void testSetXAttr() throws Exception {
       fs.setXAttr(path, "user.", value1, EnumSet.of(XAttrSetFlag.CREATE, 
           XAttrSetFlag.REPLACE));
       Assert.fail("Setting xattr with empty name should fail.");
+    } catch (RemoteException e) {
+      assertEquals("Unexpected RemoteException: " + e, e.getClassName(),
+          HadoopIllegalArgumentException.class.getCanonicalName());
+      GenericTestUtils.assertExceptionContains("XAttr name cannot be empty", e);
     } catch (HadoopIllegalArgumentException e) {
       GenericTestUtils.assertExceptionContains("XAttr name cannot be empty", e);
-    } catch (IllegalArgumentException e) {
-      GenericTestUtils.assertExceptionContains("Invalid value: \"user.\" does " + 
-          "not belong to the domain ^(user\\.|trusted\\.|system\\.|security\\.).+", e);
     }
     
     // Set xattr with invalid name: "a1"
@@ -274,11 +275,12 @@ public void testSetXAttr() throws Exception {
           XAttrSetFlag.REPLACE));
       Assert.fail("Setting xattr with invalid name prefix or without " +
           "name prefix should fail.");
+    } catch (RemoteException e) {
+      assertEquals("Unexpected RemoteException: " + e, e.getClassName(),
+          HadoopIllegalArgumentException.class.getCanonicalName());
+      GenericTestUtils.assertExceptionContains("XAttr name must be prefixed", e);
     } catch (HadoopIllegalArgumentException e) {
       GenericTestUtils.assertExceptionContains("XAttr name must be prefixed", e);
-    } catch (IllegalArgumentException e) {
-      GenericTestUtils.assertExceptionContains("Invalid value: \"a1\" does " + 
-          "not belong to the domain ^(user\\.|trusted\\.|system\\.|security\\.).+", e);
     }
     
     // Set xattr without XAttrSetFlag
@@ -341,9 +343,18 @@ public void testSetXAttr() throws Exception {
   }
   
   /**
-   * Tests for getting xattr
+   * getxattr tests. Test that getxattr throws an exception if any of
-   * 1. To get xattr which does not exist.
+   * the following are true:
-   * 2. To get multiple xattrs.
+   * an xattr that was requested doesn't exist
+   * the caller specifies an unknown namespace
+   * the caller doesn't have access to the namespace
+   * the caller doesn't have permission to get the value of the xattr
+   * the caller does not have search access to the parent directory
+   * the caller has only read access to the owning directory
+   * the caller has only search access to the owning directory and
+   * execute/search access to the actual entity
+   * the caller does not have search access to the owning directory and read
+   * access to the actual entity
    */
   @Test(timeout = 120000)
   public void testGetXAttrs() throws Exception {
@@ -351,21 +362,159 @@ public void testGetXAttrs() throws Exception {
     fs.setXAttr(path, name1, value1, EnumSet.of(XAttrSetFlag.CREATE));
     fs.setXAttr(path, name2, value2, EnumSet.of(XAttrSetFlag.CREATE));
     
-    // XAttr does not exist.
+    /* An XAttr that was requested does not exist. */
-    byte[] value = fs.getXAttr(path, name3);
+    try {
-    Assert.assertEquals(value, null);
+      final byte[] value = fs.getXAttr(path, name3);
+      Assert.fail("expected IOException");
+    } catch (IOException e) {
+      GenericTestUtils.assertExceptionContains(
+          "At least one of the attributes provided was not found.", e);
+    }
     
-    List<String> names = Lists.newArrayList();
+    /* Throw an exception if an xattr that was requested does not exist. */
+    {
+      final List<String> names = Lists.newArrayList();
       names.add(name1);
       names.add(name2);
       names.add(name3);
-    Map<String, byte[]> xattrs = fs.getXAttrs(path, names);
+      try {
-    Assert.assertEquals(xattrs.size(), 2);
+        final Map<String, byte[]> xattrs = fs.getXAttrs(path, names);
-    Assert.assertArrayEquals(value1, xattrs.get(name1));
+        Assert.fail("expected IOException");
-    Assert.assertArrayEquals(value2, xattrs.get(name2));
+      } catch (IOException e) {
+        GenericTestUtils.assertExceptionContains(
+            "At least one of the attributes provided was not found.", e);
+      }
+    }
     
     fs.removeXAttr(path, name1);
     fs.removeXAttr(path, name2);
+
+    /* Unknown namespace should throw an exception. */
+    try {
+      final byte[] xattr = fs.getXAttr(path, "wackynamespace.foo");
+      Assert.fail("expected IOException");
+    } catch (Exception e) {
+      GenericTestUtils.assertExceptionContains
+          ("An XAttr name must be prefixed with user/trusted/security/system, " +
+           "followed by a '.'",
+          e);
+    }
+
+    /*
+     * The 'trusted' namespace should not be accessible and should throw an
+     * exception.
+     */
+    final UserGroupInformation user = UserGroupInformation.
+        createUserForTesting("user", new String[] {"mygroup"});
+    fs.setXAttr(path, "trusted.foo", "1234".getBytes());
+    try {
+      user.doAs(new PrivilegedExceptionAction<Object>() {
+          @Override
+          public Object run() throws Exception {
+            final FileSystem userFs = dfsCluster.getFileSystem();
+            final byte[] xattr = userFs.getXAttr(path, "trusted.foo");
+            return null;
+          }
+        });
+      Assert.fail("expected IOException");
+    } catch (IOException e) {
+      GenericTestUtils.assertExceptionContains("User doesn't have permission", e);
+    }
+
+    fs.setXAttr(path, name1, "1234".getBytes());
+
+    /*
+     * Test that an exception is thrown if the caller doesn't have permission to
+     * get the value of the xattr.
+     */
+
+    /* Set access so that only the owner has access. */
+    fs.setPermission(path, new FsPermission((short) 0700));
+    try {
+      user.doAs(new PrivilegedExceptionAction<Object>() {
+          @Override
+          public Object run() throws Exception {
+            final FileSystem userFs = dfsCluster.getFileSystem();
+            final byte[] xattr = userFs.getXAttr(path, name1);
+            return null;
+          }
+        });
+      Assert.fail("expected IOException");
+    } catch (IOException e) {
+      GenericTestUtils.assertExceptionContains("Permission denied", e);
+    }
+
+    /*
+     * The caller must have search access to the parent directory.
+     */
+    final Path childDir = new Path(path, "child" + pathCount);
+    /* Set access to parent so that only the owner has access. */
+    FileSystem.mkdirs(fs, childDir, FsPermission.createImmutable((short)0700));
+    fs.setXAttr(childDir, name1, "1234".getBytes());
+    try {
+      user.doAs(new PrivilegedExceptionAction<Object>() {
+          @Override
+          public Object run() throws Exception {
+            final FileSystem userFs = dfsCluster.getFileSystem();
+            final byte[] xattr = userFs.getXAttr(childDir, name1);
+            return null;
+          }
+        });
+      Assert.fail("expected IOException");
+    } catch (IOException e) {
+      GenericTestUtils.assertExceptionContains("Permission denied", e);
+    }
+
+    /* Check that read access to the owning directory is not good enough. */
+    fs.setPermission(path, new FsPermission((short) 0704));
+    try {
+      user.doAs(new PrivilegedExceptionAction<Object>() {
+          @Override
+          public Object run() throws Exception {
+            final FileSystem userFs = dfsCluster.getFileSystem();
+            final byte[] xattr = userFs.getXAttr(childDir, name1);
+            return null;
+          }
+        });
+      Assert.fail("expected IOException");
+    } catch (IOException e) {
+      GenericTestUtils.assertExceptionContains("Permission denied", e);
+    }
+
+    /*
+     * Check that search access to the owning directory and search/execute
+     * access to the actual entity with extended attributes is not good enough.
+     */
+    fs.setPermission(path, new FsPermission((short) 0701));
+    fs.setPermission(childDir, new FsPermission((short) 0701));
+    try {
+      user.doAs(new PrivilegedExceptionAction<Object>() {
+          @Override
+          public Object run() throws Exception {
+            final FileSystem userFs = dfsCluster.getFileSystem();
+            final byte[] xattr = userFs.getXAttr(childDir, name1);
+            return null;
+          }
+        });
+      Assert.fail("expected IOException");
+    } catch (IOException e) {
+      GenericTestUtils.assertExceptionContains("Permission denied", e);
+    }
+
+    /*
+     * Check that search access to the owning directory and read access to
+     * the actual entity with the extended attribute is good enough.
+     */
+    fs.setPermission(path, new FsPermission((short) 0701));
+    fs.setPermission(childDir, new FsPermission((short) 0704));
+    user.doAs(new PrivilegedExceptionAction<Object>() {
+        @Override
+        public Object run() throws Exception {
+          final FileSystem userFs = dfsCluster.getFileSystem();
+          final byte[] xattr = userFs.getXAttr(childDir, name1);
+          return null;
+        }
+      });
   }
   
   /**
@@ -402,6 +551,166 @@ public void testRemoveXAttr() throws Exception {
     fs.removeXAttr(path, name3);
   }
 
+  /**
+   * removexattr tests. Test that removexattr throws an exception if any of
+   * the following are true:
+   * an xattr that was requested doesn't exist
+   * the caller specifies an unknown namespace
+   * the caller doesn't have access to the namespace
+   * the caller doesn't have permission to get the value of the xattr
+   * the caller does not have "execute" (scan) access to the parent directory
+   * the caller has only read access to the owning directory
+   * the caller has only execute access to the owning directory and execute
+   * access to the actual entity
+   * the caller does not have execute access to the owning directory and write
+   * access to the actual entity
+   */
+  @Test(timeout = 120000)
+  public void testRemoveXAttrPermissions() throws Exception {
+    FileSystem.mkdirs(fs, path, FsPermission.createImmutable((short)0750));
+    fs.setXAttr(path, name1, value1, EnumSet.of(XAttrSetFlag.CREATE));
+    fs.setXAttr(path, name2, value2, EnumSet.of(XAttrSetFlag.CREATE));
+    fs.setXAttr(path, name3, null, EnumSet.of(XAttrSetFlag.CREATE));
+
+    try {
+      fs.removeXAttr(path, name2);
+      fs.removeXAttr(path, name2);
+      Assert.fail("expected IOException");
+    } catch (IOException e) {
+      GenericTestUtils.assertExceptionContains("No matching attributes found", e);
+    }
+
+    /* Unknown namespace should throw an exception. */
+    final String expectedExceptionString = "An XAttr name must be prefixed " +
+        "with user/trusted/security/system, followed by a '.'";
+    try {
+      fs.removeXAttr(path, "wackynamespace.foo");
+      Assert.fail("expected IOException");
+    } catch (RemoteException e) {
+      assertEquals("Unexpected RemoteException: " + e, e.getClassName(),
+          HadoopIllegalArgumentException.class.getCanonicalName());
+      GenericTestUtils.assertExceptionContains(expectedExceptionString, e);
+    } catch (HadoopIllegalArgumentException e) {
+      GenericTestUtils.assertExceptionContains(expectedExceptionString, e);
+    }
+
+    /*
+     * The 'trusted' namespace should not be accessible and should throw an
+     * exception.
+     */
+    final UserGroupInformation user = UserGroupInformation.
+        createUserForTesting("user", new String[] {"mygroup"});
+    fs.setXAttr(path, "trusted.foo", "1234".getBytes());
+    try {
+      user.doAs(new PrivilegedExceptionAction<Object>() {
+          @Override
+          public Object run() throws Exception {
+            final FileSystem userFs = dfsCluster.getFileSystem();
+            userFs.removeXAttr(path, "trusted.foo");
+            return null;
+          }
+        });
+      Assert.fail("expected IOException");
+    } catch (IOException e) {
+      GenericTestUtils.assertExceptionContains("User doesn't have permission", e);
+    } finally {
+      fs.removeXAttr(path, "trusted.foo");
+    }
+
+    /*
+     * Test that an exception is thrown if the caller doesn't have permission to
+     * get the value of the xattr.
+     */
+
+    /* Set access so that only the owner has access. */
+    fs.setPermission(path, new FsPermission((short) 0700));
+    try {
+      user.doAs(new PrivilegedExceptionAction<Object>() {
+          @Override
+          public Object run() throws Exception {
+            final FileSystem userFs = dfsCluster.getFileSystem();
+            userFs.removeXAttr(path, name1);
+            return null;
+          }
+        });
+      Assert.fail("expected IOException");
+    } catch (IOException e) {
+      GenericTestUtils.assertExceptionContains("Permission denied", e);
+    }
+
+    /*
+     * The caller must have "execute" (scan) access to the parent directory.
+     */
+    final Path childDir = new Path(path, "child" + pathCount);
+    /* Set access to parent so that only the owner has access. */
+    FileSystem.mkdirs(fs, childDir, FsPermission.createImmutable((short)0700));
+    fs.setXAttr(childDir, name1, "1234".getBytes());
+    try {
+      user.doAs(new PrivilegedExceptionAction<Object>() {
+          @Override
+          public Object run() throws Exception {
+            final FileSystem userFs = dfsCluster.getFileSystem();
+            userFs.removeXAttr(childDir, name1);
+            return null;
+          }
+        });
+      Assert.fail("expected IOException");
+    } catch (IOException e) {
+      GenericTestUtils.assertExceptionContains("Permission denied", e);
+    }
+
+    /* Check that read access to the owning directory is not good enough. */
+    fs.setPermission(path, new FsPermission((short) 0704));
+    try {
+      user.doAs(new PrivilegedExceptionAction<Object>() {
+          @Override
+          public Object run() throws Exception {
+            final FileSystem userFs = dfsCluster.getFileSystem();
+            userFs.removeXAttr(childDir, name1);
+            return null;
+          }
+        });
+      Assert.fail("expected IOException");
+    } catch (IOException e) {
+      GenericTestUtils.assertExceptionContains("Permission denied", e);
+    }
+
+    /*
+     * Check that execute access to the owning directory and scan access to
+     * the actual entity with extended attributes is not good enough.
+     */
+    fs.setPermission(path, new FsPermission((short) 0701));
+    fs.setPermission(childDir, new FsPermission((short) 0701));
+    try {
+      user.doAs(new PrivilegedExceptionAction<Object>() {
+          @Override
+          public Object run() throws Exception {
+            final FileSystem userFs = dfsCluster.getFileSystem();
+            userFs.removeXAttr(childDir, name1);
+            return null;
+          }
+        });
+      Assert.fail("expected IOException");
+    } catch (IOException e) {
+      GenericTestUtils.assertExceptionContains("Permission denied", e);
+    }
+
+    /*
+     * Check that execute access to the owning directory and write access to
+     * the actual entity with extended attributes is good enough.
+     */
+    fs.setPermission(path, new FsPermission((short) 0701));
+    fs.setPermission(childDir, new FsPermission((short) 0706));
+    user.doAs(new PrivilegedExceptionAction<Object>() {
+        @Override
+        public Object run() throws Exception {
+          final FileSystem userFs = dfsCluster.getFileSystem();
+          userFs.removeXAttr(childDir, name1);
+          return null;
+        }
+      });
+  }
+
   @Test(timeout = 120000)
   public void testRenameFileWithXAttr() throws Exception {
     FileSystem.mkdirs(fs, path, FsPermission.createImmutable((short)0750));

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestINodeFile.java

@@ -546,6 +546,7 @@ public void testInodeIdBasedPaths() throws Exception {
     Configuration conf = new Configuration();
     conf.setInt(DFSConfigKeys.DFS_BLOCK_SIZE_KEY,
         DFSConfigKeys.DFS_BYTES_PER_CHECKSUM_DEFAULT);
+    conf.setBoolean(DFSConfigKeys.DFS_NAMENODE_ACLS_ENABLED_KEY, true);
     MiniDFSCluster cluster = null;
     try {
       cluster = new MiniDFSCluster.Builder(conf).numDataNodes(1).build();
@@ -594,6 +595,19 @@ public void testInodeIdBasedPaths() throws Exception {
       assertEquals(testFileBlockSize,
           nnRpc.getPreferredBlockSize(testFileInodePath.toString()));
 
+      /*
+       * HDFS-6749 added missing calls to FSDirectory.resolvePath in the
+       * following four methods. The calls below ensure that
+       * /.reserved/.inodes paths work properly. No need to check return
+       * values as these methods are tested elsewhere.
+       */
+      {
+        fs.isFileClosed(testFileInodePath);
+        fs.getAclStatus(testFileInodePath);
+        fs.getXAttrs(testFileInodePath);
+        fs.listXAttrs(testFileInodePath);
+      }
+      
       // symbolic link related tests
       
       // Reserved path is not allowed as a target

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestNNStorageRetentionManager.java

@@ -212,18 +212,25 @@ public void testRetainExtraLogsLimitedSegments() throws IOException {
     tc.addImage("/foo1/current/" + getImageFileName(300), false);
     tc.addImage("/foo1/current/" + getImageFileName(400), false);
 
+    // Segments containing txns upto txId 250 are extra and should be purged.
     tc.addLog("/foo2/current/" + getFinalizedEditsFileName(1, 100), true);
-    // Without lowering the max segments to retain, we'd retain all segments
-    // going back to txid 150 (300 - 150).
     tc.addLog("/foo2/current/" + getFinalizedEditsFileName(101, 175), true);
+    tc.addLog("/foo2/current/" + getInProgressEditsFileName(176) + ".empty",
+        true);
     tc.addLog("/foo2/current/" + getFinalizedEditsFileName(176, 200), true);
     tc.addLog("/foo2/current/" + getFinalizedEditsFileName(201, 225), true);
+    tc.addLog("/foo2/current/" + getInProgressEditsFileName(226) + ".corrupt",
+        true);
     tc.addLog("/foo2/current/" + getFinalizedEditsFileName(226, 240), true);
     // Only retain 2 extra segments. The 301-350 and 351-400 segments are
     // considered required, not extra.
     tc.addLog("/foo2/current/" + getFinalizedEditsFileName(241, 275), false);
     tc.addLog("/foo2/current/" + getFinalizedEditsFileName(276, 300), false);
+    tc.addLog("/foo2/current/" + getInProgressEditsFileName(301) + ".empty",
+        false);
     tc.addLog("/foo2/current/" + getFinalizedEditsFileName(301, 350), false);
+    tc.addLog("/foo2/current/" + getInProgressEditsFileName(351) + ".corrupt",
+        false);
     tc.addLog("/foo2/current/" + getFinalizedEditsFileName(351, 400), false);
     tc.addLog("/foo2/current/" + getInProgressEditsFileName(401), false);
     runTest(tc);

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestNamenodeRetryCache.java

@@ -415,7 +415,7 @@ public void testRetryCacheRebuild() throws Exception {
     
     LightWeightCache<CacheEntry, CacheEntry> cacheSet = 
         (LightWeightCache<CacheEntry, CacheEntry>) namesystem.getRetryCache().getCacheSet();
-    assertEquals(22, cacheSet.size());
+    assertEquals(23, cacheSet.size());
     
     Map<CacheEntry, CacheEntry> oldEntries = 
         new HashMap<CacheEntry, CacheEntry>();
@@ -434,7 +434,7 @@ public void testRetryCacheRebuild() throws Exception {
     assertTrue(namesystem.hasRetryCache());
     cacheSet = (LightWeightCache<CacheEntry, CacheEntry>) namesystem
         .getRetryCache().getCacheSet();
-    assertEquals(22, cacheSet.size());
+    assertEquals(23, cacheSet.size());
     iter = cacheSet.iterator();
     while (iter.hasNext()) {
       CacheEntry entry = iter.next();

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/ha/TestRetryCacheWithHA.java

@@ -160,7 +160,7 @@ public void testRetryCacheOnStandbyNN() throws Exception {
     FSNamesystem fsn0 = cluster.getNamesystem(0);
     LightWeightCache<CacheEntry, CacheEntry> cacheSet = 
         (LightWeightCache<CacheEntry, CacheEntry>) fsn0.getRetryCache().getCacheSet();
-    assertEquals(22, cacheSet.size());
+    assertEquals(23, cacheSet.size());
     
     Map<CacheEntry, CacheEntry> oldEntries = 
         new HashMap<CacheEntry, CacheEntry>();
@@ -181,7 +181,7 @@ public void testRetryCacheOnStandbyNN() throws Exception {
     FSNamesystem fsn1 = cluster.getNamesystem(1);
     cacheSet = (LightWeightCache<CacheEntry, CacheEntry>) fsn1
         .getRetryCache().getCacheSet();
-    assertEquals(22, cacheSet.size());
+    assertEquals(23, cacheSet.size());
     iter = cacheSet.iterator();
     while (iter.hasNext()) {
       CacheEntry entry = iter.next();
@@ -1047,6 +1047,49 @@ Object getResult() {
     }
   }
 
+  /** removeXAttr */
+  class RemoveXAttrOp extends AtMostOnceOp {
+    private final String src;
+
+    RemoveXAttrOp(DFSClient client, String src) {
+      super("removeXAttr", client);
+      this.src = src;
+    }
+
+    @Override
+    void prepare() throws Exception {
+      Path p = new Path(src);
+      if (!dfs.exists(p)) {
+        DFSTestUtil.createFile(dfs, p, BlockSize, DataNodes, 0);
+        client.setXAttr(src, "user.key", "value".getBytes(),
+          EnumSet.of(XAttrSetFlag.CREATE));
+      }
+    }
+
+    @Override
+    void invoke() throws Exception {
+      client.removeXAttr(src, "user.key");
+    }
+
+    @Override
+    boolean checkNamenodeBeforeReturn() throws Exception {
+      for (int i = 0; i < CHECKTIMES; i++) {
+        Map<String, byte[]> iter = dfs.getXAttrs(new Path(src));
+        Set<String> keySet = iter.keySet();
+        if (!keySet.contains("user.key")) {
+          return true;
+        }
+        Thread.sleep(1000);
+      }
+      return false;
+    }
+
+    @Override
+    Object getResult() {
+      return null;
+    }
+  }
+
   @Test (timeout=60000)
   public void testCreateSnapshot() throws Exception {
     final DFSClient client = genClientWithDummyHandler();
@@ -1183,6 +1226,13 @@ public void testSetXAttr() throws Exception {
     testClientRetryWithFailover(op);
   }
 
+  @Test (timeout=60000)
+  public void testRemoveXAttr() throws Exception {
+    DFSClient client = genClientWithDummyHandler();
+    AtMostOnceOp op = new RemoveXAttrOp(client, "/removexattr");
+    testClientRetryWithFailover(op);
+  }
+
   /**
    * When NN failover happens, if the client did not receive the response and
    * send a retry request to the other NN, the same response should be recieved

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/shortcircuit/TestShortCircuitCache.java

@@ -23,6 +23,7 @@
 import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_CLIENT_READ_SHORTCIRCUIT_KEY;
 import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_CLIENT_READ_SHORTCIRCUIT_SKIP_CHECKSUM_KEY;
 import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_DOMAIN_SOCKET_PATH_KEY;
+import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_CLIENT_READ_SHORTCIRCUIT_STREAMS_CACHE_EXPIRY_MS_KEY;
 import static org.hamcrest.CoreMatchers.equalTo;
 
 import java.io.DataOutputStream;
@@ -30,7 +31,9 @@
 import java.io.FileInputStream;
 import java.io.FileOutputStream;
 import java.io.IOException;
+import java.util.Arrays;
 import java.util.HashMap;
+import java.util.Iterator;
 import java.util.Map;
 
 import org.apache.commons.lang.mutable.MutableBoolean;
@@ -462,6 +465,7 @@ public void visit(HashMap<DatanodeInfo, PerDatanodeVisitorInfo> info)
       }
     }, 10, 60000);
     cluster.shutdown();
+    sockDir.close();
   }
 
   @Test(timeout=60000)
@@ -516,4 +520,98 @@ public void visit(int numOutstandingMmaps,
     });
     cluster.shutdown();
   }
+
+  /**
+   * Test unlinking a file whose blocks we are caching in the DFSClient.
+   * The DataNode will notify the DFSClient that the replica is stale via the
+   * ShortCircuitShm.
+   */
+  @Test(timeout=60000)
+  public void testUnlinkingReplicasInFileDescriptorCache() throws Exception {
+    BlockReaderTestUtil.enableShortCircuitShmTracing();
+    TemporarySocketDirectory sockDir = new TemporarySocketDirectory();
+    Configuration conf = createShortCircuitConf(
+        "testUnlinkingReplicasInFileDescriptorCache", sockDir);
+    // We don't want the CacheCleaner to time out short-circuit shared memory
+    // segments during the test, so set the timeout really high.
+    conf.setLong(DFS_CLIENT_READ_SHORTCIRCUIT_STREAMS_CACHE_EXPIRY_MS_KEY,
+        1000000000L);
+    MiniDFSCluster cluster =
+        new MiniDFSCluster.Builder(conf).numDataNodes(1).build();
+    cluster.waitActive();
+    DistributedFileSystem fs = cluster.getFileSystem();
+    final ShortCircuitCache cache =
+        fs.getClient().getClientContext().getShortCircuitCache();
+    cache.getDfsClientShmManager().visit(new Visitor() {
+      @Override
+      public void visit(HashMap<DatanodeInfo, PerDatanodeVisitorInfo> info)
+          throws IOException {
+        // The ClientShmManager starts off empty.
+        Assert.assertEquals(0,  info.size());
+      }
+    });
+    final Path TEST_PATH = new Path("/test_file");
+    final int TEST_FILE_LEN = 8193;
+    final int SEED = 0xFADE0;
+    DFSTestUtil.createFile(fs, TEST_PATH, TEST_FILE_LEN,
+        (short)1, SEED);
+    byte contents[] = DFSTestUtil.readFileBuffer(fs, TEST_PATH);
+    byte expected[] = DFSTestUtil.
+        calculateFileContentsFromSeed(SEED, TEST_FILE_LEN);
+    Assert.assertTrue(Arrays.equals(contents, expected));
+    // Loading this file brought the ShortCircuitReplica into our local
+    // replica cache.
+    final DatanodeInfo datanode =
+        new DatanodeInfo(cluster.getDataNodes().get(0).getDatanodeId());
+    cache.getDfsClientShmManager().visit(new Visitor() {
+      @Override
+      public void visit(HashMap<DatanodeInfo, PerDatanodeVisitorInfo> info)
+          throws IOException {
+        Assert.assertTrue(info.get(datanode).full.isEmpty());
+        Assert.assertFalse(info.get(datanode).disabled);
+        Assert.assertEquals(1, info.get(datanode).notFull.values().size());
+        DfsClientShm shm =
+            info.get(datanode).notFull.values().iterator().next();
+        Assert.assertFalse(shm.isDisconnected());
+      }
+    });
+    // Remove the file whose blocks we just read.
+    fs.delete(TEST_PATH, false);
+
+    // Wait for the replica to be purged from the DFSClient's cache.
+    GenericTestUtils.waitFor(new Supplier<Boolean>() {
+      MutableBoolean done = new MutableBoolean(true);
+      @Override
+      public Boolean get() {
+        try {
+          done.setValue(true);
+          cache.getDfsClientShmManager().visit(new Visitor() {
+            @Override
+            public void visit(HashMap<DatanodeInfo,
+                  PerDatanodeVisitorInfo> info) throws IOException {
+              Assert.assertTrue(info.get(datanode).full.isEmpty());
+              Assert.assertFalse(info.get(datanode).disabled);
+              Assert.assertEquals(1,
+                  info.get(datanode).notFull.values().size());
+              DfsClientShm shm = info.get(datanode).notFull.values().
+                  iterator().next();
+              // Check that all slots have been invalidated.
+              for (Iterator<Slot> iter = shm.slotIterator();
+                   iter.hasNext(); ) {
+                Slot slot = iter.next();
+                if (slot.isValid()) {
+                  done.setValue(false);
+                }
+              }
+            }
+          });
+        } catch (IOException e) {
+          LOG.error("error running visitor", e);
+        }
+        return done.booleanValue();
+      }
+    }, 10, 60000);
+    cluster.shutdown();
+    sockDir.close();
+  }
 }

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/web/TestWebHDFS.java

@@ -39,14 +39,18 @@
 import org.apache.hadoop.hdfs.DistributedFileSystem;
 import org.apache.hadoop.hdfs.HdfsConfiguration;
 import org.apache.hadoop.hdfs.MiniDFSCluster;
+import org.apache.hadoop.hdfs.TestDFSClientRetries;
+import org.apache.hadoop.hdfs.server.namenode.NameNode;
 import org.apache.hadoop.hdfs.server.namenode.snapshot.SnapshotTestHelper;
 import org.apache.hadoop.hdfs.server.namenode.web.resources.NamenodeWebHdfsMethods;
-import org.apache.hadoop.hdfs.TestDFSClientRetries;
+import org.apache.hadoop.hdfs.server.protocol.NamenodeProtocols;
+import org.apache.hadoop.ipc.RetriableException;
 import org.apache.hadoop.security.UserGroupInformation;
 import org.apache.hadoop.test.GenericTestUtils;
 import org.apache.log4j.Level;
 import org.junit.Assert;
 import org.junit.Test;
+import org.mockito.internal.util.reflection.Whitebox;
 
 /** Test WebHDFS */
 public class TestWebHDFS {
@@ -445,4 +449,37 @@ public void testWebHdfsRenameSnapshot() throws Exception {
       }
     }
   }
+
+  /**
+   * Make sure a RetriableException is thrown when rpcServer is null in
+   * NamenodeWebHdfsMethods.
+   */
+  @Test
+  public void testRaceWhileNNStartup() throws Exception {
+    MiniDFSCluster cluster = null;
+    final Configuration conf = WebHdfsTestUtil.createConf();
+    try {
+      cluster = new MiniDFSCluster.Builder(conf).numDataNodes(0).build();
+      cluster.waitActive();
+      final NameNode namenode = cluster.getNameNode();
+      final NamenodeProtocols rpcServer = namenode.getRpcServer();
+      Whitebox.setInternalState(namenode, "rpcServer", null);
+
+      final Path foo = new Path("/foo");
+      final FileSystem webHdfs = WebHdfsTestUtil.getWebHdfsFileSystem(conf,
+          WebHdfsFileSystem.SCHEME);
+      try {
+        webHdfs.mkdirs(foo);
+        fail("Expected RetriableException");
+      } catch (RetriableException e) {
+        GenericTestUtils.assertExceptionContains("Namenode is in startup mode",
+            e);
+      }
+      Whitebox.setInternalState(namenode, "rpcServer", rpcServer);
+    } finally {
+      if (cluster != null) {
+        cluster.shutdown();
+      }
+    }
+  }
 }

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/web/TestWebHDFSForHA.java

@@ -18,6 +18,15 @@
 
 package org.apache.hadoop.hdfs.web;
 
+import static org.apache.hadoop.fs.CommonConfigurationKeysPublic.FS_DEFAULT_NAME_KEY;
+import static org.mockito.Mockito.spy;
+import static org.mockito.Mockito.verify;
+
+import java.io.IOException;
+import java.net.URI;
+import java.util.HashMap;
+import java.util.Map;
+
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.FSDataInputStream;
 import org.apache.hadoop.fs.FSDataOutputStream;
@@ -29,18 +38,14 @@
 import org.apache.hadoop.hdfs.MiniDFSCluster;
 import org.apache.hadoop.hdfs.MiniDFSNNTopology;
 import org.apache.hadoop.hdfs.protocol.HdfsConstants;
+import org.apache.hadoop.hdfs.server.namenode.NameNode;
 import org.apache.hadoop.hdfs.server.namenode.ha.HATestUtil;
+import org.apache.hadoop.hdfs.server.protocol.NamenodeProtocols;
 import org.apache.hadoop.io.IOUtils;
 import org.apache.hadoop.security.token.Token;
 import org.junit.Assert;
 import org.junit.Test;
-
+import org.mockito.internal.util.reflection.Whitebox;
-import java.io.IOException;
-import java.net.URI;
-
-import static org.apache.hadoop.fs.CommonConfigurationKeysPublic.FS_DEFAULT_NAME_KEY;
-import static org.mockito.Mockito.spy;
-import static org.mockito.Mockito.verify;
 
 public class TestWebHDFSForHA {
   private static final String LOGICAL_NAME = "minidfs";
@@ -182,4 +187,61 @@ public void testMultipleNamespacesConfigured() throws Exception {
       }
     }
   }
+
+  /**
+   * Make sure the WebHdfsFileSystem will retry based on RetriableException when
+   * rpcServer is null in NamenodeWebHdfsMethods while NameNode starts up.
+   */
+  @Test (timeout=120000)
+  public void testRetryWhileNNStartup() throws Exception {
+    final Configuration conf = DFSTestUtil.newHAConfiguration(LOGICAL_NAME);
+    MiniDFSCluster cluster = null;
+    final Map<String, Boolean> resultMap = new HashMap<String, Boolean>();
+
+    try {
+      cluster = new MiniDFSCluster.Builder(conf).nnTopology(topo)
+          .numDataNodes(0).build();
+      HATestUtil.setFailoverConfigurations(cluster, conf, LOGICAL_NAME);
+      cluster.waitActive();
+      cluster.transitionToActive(0);
+
+      final NameNode namenode = cluster.getNameNode(0);
+      final NamenodeProtocols rpcServer = namenode.getRpcServer();
+      Whitebox.setInternalState(namenode, "rpcServer", null);
+
+      new Thread() {
+        @Override
+        public void run() {
+          boolean result = false;
+          FileSystem fs = null;
+          try {
+            fs = FileSystem.get(WEBHDFS_URI, conf);
+            final Path dir = new Path("/test");
+            result = fs.mkdirs(dir);
+          } catch (IOException e) {
+            result = false;
+          } finally {
+            IOUtils.cleanup(null, fs);
+          }
+          synchronized (TestWebHDFSForHA.this) {
+            resultMap.put("mkdirs", result);
+            TestWebHDFSForHA.this.notifyAll();
+          }
+        }
+      }.start();
+
+      Thread.sleep(1000);
+      Whitebox.setInternalState(namenode, "rpcServer", rpcServer);
+      synchronized (this) {
+        while (!resultMap.containsKey("mkdirs")) {
+          this.wait();
+        }
+        Assert.assertTrue(resultMap.get("mkdirs"));
+      }
+    } finally {
+      if (cluster != null) {
+        cluster.shutdown();
+      }
+    }
+  }
 }

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/web/resources/TestParam.java

@@ -355,12 +355,6 @@ public void testAclPermissionParam() {
   public void testXAttrNameParam() {
     final XAttrNameParam p = new XAttrNameParam("user.a1");
     Assert.assertEquals(p.getXAttrName(), "user.a1");
-    try {
-      new XAttrNameParam("a1");
-      Assert.fail();
-    } catch (IllegalArgumentException e) {
-      LOG.info("EXPECTED: " + e);
-    }
   }
   
   @Test

hadoop-hdfs-project/hadoop-hdfs/src/test/resources/editsStored.xml

@@ -986,6 +986,8 @@
         <NAMESPACE>USER</NAMESPACE>
         <NAME>a2</NAME>
       </XATTR>
+      <RPC_CLIENTID>e03f4a52-3d85-4e05-8942-286185e639bd</RPC_CLIENTID>
+      <RPC_CALLID>82</RPC_CALLID>
     </DATA>
   </RECORD>
   <RECORD>

hadoop-mapreduce-project/CHANGES.txt

@@ -325,6 +325,9 @@ Release 2.5.0 - UNRELEASED
     MAPREDUCE-5952. LocalContainerLauncher#renameMapOutputForReduce incorrectly 
     assumes a single dir for mapOutIndex. (Gera Shegalov via kasha)
 
+    MAPREDUCE-6002. Made MR task avoid reporting error to AM when the task process
+    is shutting down. (Wangda Tan via zjshen)
+
 Release 2.4.1 - 2014-06-23 
 
   INCOMPATIBLE CHANGES

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapred/LocalContainerLauncher.java

@@ -31,6 +31,7 @@
 import java.util.concurrent.LinkedBlockingQueue;
 
 import com.google.common.annotations.VisibleForTesting;
+
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.apache.hadoop.fs.FSError;
@@ -57,6 +58,7 @@
 import org.apache.hadoop.mapreduce.v2.app.launcher.ContainerRemoteLaunchEvent;
 import org.apache.hadoop.service.AbstractService;
 import org.apache.hadoop.util.ExitUtil;
+import org.apache.hadoop.util.ShutdownHookManager;
 import org.apache.hadoop.util.StringUtils;
 import org.apache.hadoop.yarn.api.ApplicationConstants.Environment;
 import org.apache.hadoop.yarn.exceptions.YarnRuntimeException;
@@ -406,7 +408,9 @@ private void runSubtask(org.apache.hadoop.mapred.Task task,
       } catch (FSError e) {
         LOG.fatal("FSError from child", e);
         // umbilical:  MRAppMaster creates (taskAttemptListener), passes to us
+        if (!ShutdownHookManager.get().isShutdownInProgress()) {
           umbilical.fsError(classicAttemptID, e.getMessage());
+        }
         throw new RuntimeException();
 
       } catch (Exception exception) {
@@ -429,11 +433,13 @@ private void runSubtask(org.apache.hadoop.mapred.Task task,
       } catch (Throwable throwable) {
         LOG.fatal("Error running local (uberized) 'child' : "
             + StringUtils.stringifyException(throwable));
+        if (!ShutdownHookManager.get().isShutdownInProgress()) {
           Throwable tCause = throwable.getCause();
-        String cause = (tCause == null)
+          String cause =
-            ? throwable.getMessage()
+              (tCause == null) ? throwable.getMessage() : StringUtils
-                : StringUtils.stringifyException(tCause);
+                  .stringifyException(tCause);
           umbilical.fatalError(classicAttemptID, cause);
+        }
         throw new RuntimeException();
       }
     }

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapred/YarnChild.java

@@ -56,6 +56,7 @@
 import org.apache.hadoop.security.UserGroupInformation;
 import org.apache.hadoop.security.token.Token;
 import org.apache.hadoop.util.DiskChecker.DiskErrorException;
+import org.apache.hadoop.util.ShutdownHookManager;
 import org.apache.hadoop.util.StringUtils;
 import org.apache.hadoop.yarn.YarnUncaughtExceptionHandler;
 import org.apache.hadoop.yarn.api.ApplicationConstants;
@@ -176,7 +177,9 @@ public Object run() throws Exception {
       });
     } catch (FSError e) {
       LOG.fatal("FSError from child", e);
+      if (!ShutdownHookManager.get().isShutdownInProgress()) {
         umbilical.fsError(taskid, e.getMessage());
+      }
     } catch (Exception exception) {
       LOG.warn("Exception running child : "
           + StringUtils.stringifyException(exception));
@@ -201,18 +204,23 @@ public Object run() throws Exception {
       }
       // Report back any failures, for diagnostic purposes
       if (taskid != null) {
-        umbilical.fatalError(taskid, StringUtils.stringifyException(exception));
+        if (!ShutdownHookManager.get().isShutdownInProgress()) {
+          umbilical.fatalError(taskid,
+              StringUtils.stringifyException(exception));
+        }
       }
     } catch (Throwable throwable) {
       LOG.fatal("Error running child : "
     	        + StringUtils.stringifyException(throwable));
       if (taskid != null) {
+        if (!ShutdownHookManager.get().isShutdownInProgress()) {
           Throwable tCause = throwable.getCause();
-        String cause = tCause == null
+          String cause =
-                                 ? throwable.getMessage()
+              tCause == null ? throwable.getMessage() : StringUtils
-                                 : StringUtils.stringifyException(tCause);
+                  .stringifyException(tCause);
           umbilical.fatalError(taskid, cause);
         }
+      }
     } finally {
       RPC.stopProxy(umbilical);
       DefaultMetricsSystem.shutdown();

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapred/Task.java

@@ -66,6 +66,7 @@
 import org.apache.hadoop.util.Progress;
 import org.apache.hadoop.util.Progressable;
 import org.apache.hadoop.util.ReflectionUtils;
+import org.apache.hadoop.util.ShutdownHookManager;
 import org.apache.hadoop.util.StringInterner;
 import org.apache.hadoop.util.StringUtils;
 
@@ -322,6 +323,11 @@ protected void setWriteSkipRecs(boolean writeSkipRecs) {
   protected void reportFatalError(TaskAttemptID id, Throwable throwable, 
                                   String logMsg) {
     LOG.fatal(logMsg);
+    
+    if (ShutdownHookManager.get().isShutdownInProgress()) {
+      return;
+    }
+    
     Throwable tCause = throwable.getCause();
     String cause = tCause == null 
                    ? StringUtils.stringifyException(throwable)

hadoop-tools/hadoop-sls/src/main/java/org/apache/hadoop/yarn/sls/RumenToSLSConverter.java

@@ -21,6 +21,8 @@
 import org.apache.commons.cli.CommandLineParser;
 import org.apache.commons.cli.GnuParser;
 import org.apache.commons.cli.Options;
+import org.apache.hadoop.classification.InterfaceAudience.Private;
+import org.apache.hadoop.classification.InterfaceStability.Unstable;
 import org.codehaus.jackson.JsonFactory;
 import org.codehaus.jackson.map.ObjectMapper;
 import org.codehaus.jackson.map.ObjectWriter;
@@ -42,6 +44,8 @@
 import java.util.TreeMap;
 import java.util.TreeSet;
 
+@Private
+@Unstable
 public class RumenToSLSConverter {
   private static final String EOL = System.getProperty("line.separator");
 

hadoop-tools/hadoop-sls/src/main/java/org/apache/hadoop/yarn/sls/SLSRunner.java

@@ -32,6 +32,8 @@
 import java.util.Random;
 import java.util.Arrays;
 
+import org.apache.hadoop.classification.InterfaceAudience.Private;
+import org.apache.hadoop.classification.InterfaceStability.Unstable;
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.tools.rumen.JobTraceReader;
 import org.apache.hadoop.tools.rumen.LoggedJob;
@@ -66,6 +68,8 @@
 import org.codehaus.jackson.JsonFactory;
 import org.codehaus.jackson.map.ObjectMapper;
 
+@Private
+@Unstable
 public class SLSRunner {
   // RM, Runner
   private ResourceManager rm;

hadoop-tools/hadoop-sls/src/main/java/org/apache/hadoop/yarn/sls/appmaster/AMSimulator.java

@@ -29,6 +29,8 @@
 import java.util.concurrent.BlockingQueue;
 import java.util.concurrent.LinkedBlockingQueue;
 
+import org.apache.hadoop.classification.InterfaceAudience.Private;
+import org.apache.hadoop.classification.InterfaceStability.Unstable;
 import org.apache.hadoop.security.UserGroupInformation;
 import org.apache.hadoop.security.token.Token;
 import org.apache.hadoop.yarn.api.protocolrecords.AllocateRequest;
@@ -61,6 +63,8 @@
 import org.apache.hadoop.yarn.server.resourcemanager.ResourceManager;
 import org.apache.hadoop.yarn.server.resourcemanager.rmapp.RMApp;
 import org.apache.hadoop.yarn.server.resourcemanager.rmapp.RMAppState;
+import org.apache.hadoop.yarn.server.resourcemanager.rmapp.attempt.RMAppAttempt;
+import org.apache.hadoop.yarn.server.resourcemanager.rmapp.attempt.RMAppAttemptState;
 import org.apache.hadoop.yarn.util.Records;
 import org.apache.log4j.Logger;
 
@@ -70,6 +74,8 @@
 import org.apache.hadoop.yarn.sls.scheduler.TaskRunner;
 import org.apache.hadoop.yarn.sls.utils.SLSUtils;
 
+@Private
+@Unstable
 public abstract class AMSimulator extends TaskRunner.Task {
   // resource manager
   protected ResourceManager rm;
@@ -129,8 +135,7 @@ public void init(int id, int heartbeatInterval,
    * register with RM
    */
   @Override
-  public void firstStep()
+  public void firstStep() throws Exception {
-          throws YarnException, IOException, InterruptedException {
     simulateStartTimeMS = System.currentTimeMillis() - 
                           SLSRunner.getRunner().getStartTimeMS();
 
@@ -145,8 +150,7 @@ public void firstStep()
   }
 
   @Override
-  public void middleStep()
+  public void middleStep() throws Exception {
-          throws InterruptedException, YarnException, IOException {
     // process responses in the queue
     processResponseQueue();
     
@@ -158,7 +162,7 @@ public void middleStep()
   }
 
   @Override
-  public void lastStep() {
+  public void lastStep() throws Exception {
     LOG.info(MessageFormat.format("Application {0} is shutting down.", appId));
     // unregister tracking
     if (isTracked) {
@@ -169,11 +173,9 @@ public void lastStep() {
                   .newRecordInstance(FinishApplicationMasterRequest.class);
     finishAMRequest.setFinalApplicationStatus(FinalApplicationStatus.SUCCEEDED);
 
-    try {
     UserGroupInformation ugi =
         UserGroupInformation.createRemoteUser(appAttemptId.toString());
-      Token<AMRMTokenIdentifier> token =
+    Token<AMRMTokenIdentifier> token = rm.getRMContext().getRMApps().get(appId)
-              rm.getRMContext().getRMApps().get(appAttemptId.getApplicationId())
         .getRMAppAttempt(appAttemptId).getAMRMToken();
     ugi.addTokenIdentifier(token.decodeIdentifier());
     ugi.doAs(new PrivilegedExceptionAction<Object>() {
@@ -184,11 +186,6 @@ public Object run() throws Exception {
         return null;
       }
     });
-    } catch (IOException e) {
-      e.printStackTrace();
-    } catch (InterruptedException e) {
-      e.printStackTrace();
-    }
 
     simulateFinishTimeMS = System.currentTimeMillis() -
         SLSRunner.getRunner().getStartTimeMS();
@@ -226,11 +223,9 @@ protected AllocateRequest createAllocateRequest(List<ResourceRequest> ask) {
     return createAllocateRequest(ask, new ArrayList<ContainerId>());
   }
 
-  protected abstract void processResponseQueue()
+  protected abstract void processResponseQueue() throws Exception;
-          throws InterruptedException, YarnException, IOException;
   
-  protected abstract void sendContainerRequest()
+  protected abstract void sendContainerRequest() throws Exception;
-          throws YarnException, IOException, InterruptedException;
   
   protected abstract void checkStop();
   
@@ -276,11 +271,18 @@ public Object run() throws YarnException {
     // waiting until application ACCEPTED
     RMApp app = rm.getRMContext().getRMApps().get(appId);
     while(app.getState() != RMAppState.ACCEPTED) {
-      Thread.sleep(50);
+      Thread.sleep(10);
     }
 
-    appAttemptId = rm.getRMContext().getRMApps().get(appId)
+    // Waiting until application attempt reach LAUNCHED
+    // "Unmanaged AM must register after AM attempt reaches LAUNCHED state"
+    this.appAttemptId = rm.getRMContext().getRMApps().get(appId)
         .getCurrentAppAttempt().getAppAttemptId();
+    RMAppAttempt rmAppAttempt = rm.getRMContext().getRMApps().get(appId)
+        .getCurrentAppAttempt();
+    while (rmAppAttempt.getAppAttemptState() != RMAppAttemptState.LAUNCHED) {
+      Thread.sleep(10);
+    }
   }
 
   private void registerAM()
@@ -294,8 +296,7 @@ private void registerAM()
 
     UserGroupInformation ugi =
         UserGroupInformation.createRemoteUser(appAttemptId.toString());
-    Token<AMRMTokenIdentifier> token =
+    Token<AMRMTokenIdentifier> token = rm.getRMContext().getRMApps().get(appId)
-            rm.getRMContext().getRMApps().get(appAttemptId.getApplicationId())
         .getRMAppAttempt(appAttemptId).getAMRMToken();
     ugi.addTokenIdentifier(token.decodeIdentifier());
 

hadoop-tools/hadoop-sls/src/main/java/org/apache/hadoop/yarn/sls/appmaster/MRAMSimulator.java

@@ -27,6 +27,8 @@
 import java.util.List;
 import java.util.Map;
 
+import org.apache.hadoop.classification.InterfaceAudience.Private;
+import org.apache.hadoop.classification.InterfaceStability.Unstable;
 import org.apache.hadoop.security.UserGroupInformation;
 import org.apache.hadoop.security.token.Token;
 import org.apache.hadoop.yarn.api.protocolrecords.AllocateRequest;
@@ -45,6 +47,8 @@
 import org.apache.hadoop.yarn.sls.SLSRunner;
 import org.apache.log4j.Logger;
 
+@Private
+@Unstable
 public class MRAMSimulator extends AMSimulator {
   /*
   Vocabulary Used: 
@@ -141,8 +145,7 @@ public void init(int id, int heartbeatInterval,
   }
 
   @Override
-  public void firstStep()
+  public void firstStep() throws Exception {
-          throws YarnException, IOException, InterruptedException {
     super.firstStep();
     
     requestAMContainer();
@@ -386,7 +389,7 @@ protected void checkStop() {
   }
 
   @Override
-  public void lastStep() {
+  public void lastStep() throws Exception {
     super.lastStep();
 
     // clear data structures

hadoop-tools/hadoop-sls/src/main/java/org/apache/hadoop/yarn/sls/conf/SLSConfiguration.java

@@ -18,6 +18,11 @@
 
 package org.apache.hadoop.yarn.sls.conf;
 
+import org.apache.hadoop.classification.InterfaceAudience.Private;
+import org.apache.hadoop.classification.InterfaceStability.Unstable;
+
+@Private
+@Unstable
 public class SLSConfiguration {
   // sls
   public static final String PREFIX = "yarn.sls.";

hadoop-tools/hadoop-sls/src/main/java/org/apache/hadoop/yarn/sls/nodemanager/NMSimulator.java

@@ -27,6 +27,9 @@
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.DelayQueue;
 
+import com.google.common.annotations.VisibleForTesting;
+import org.apache.hadoop.classification.InterfaceAudience.Private;
+import org.apache.hadoop.classification.InterfaceStability.Unstable;
 import org.apache.hadoop.yarn.api.records.ApplicationId;
 import org.apache.hadoop.yarn.api.records.Container;
 import org.apache.hadoop.yarn.api.records.ContainerExitStatus;
@@ -54,6 +57,8 @@
 import org.apache.hadoop.yarn.sls.scheduler.TaskRunner;
 import org.apache.hadoop.yarn.sls.utils.SLSUtils;
 
+@Private
+@Unstable
 public class NMSimulator extends TaskRunner.Task {
   // node resource
   private RMNode node;
@@ -103,12 +108,12 @@ public void init(String nodeIdStr, int memory, int cores,
   }
 
   @Override
-  public void firstStep() throws YarnException, IOException {
+  public void firstStep() {
     // do nothing
   }
 
   @Override
-  public void middleStep() {
+  public void middleStep() throws Exception {
     // we check the lifetime for each running containers
     ContainerSimulator cs = null;
     synchronized(completedContainerList) {
@@ -132,7 +137,6 @@ public void middleStep() {
     ns.setResponseId(RESPONSE_ID ++);
     ns.setNodeHealthStatus(NodeHealthStatus.newInstance(true, "", 0));
     beatRequest.setNodeStatus(ns);
-    try {
     NodeHeartbeatResponse beatResponse =
         rm.getResourceTrackerService().nodeHeartbeat(beatRequest);
     if (! beatResponse.getContainersToCleanup().isEmpty()) {
@@ -159,11 +163,6 @@ public void middleStep() {
     if (beatResponse.getNodeAction() == NodeAction.SHUTDOWN) {
       lastStep();
     }
-    } catch (YarnException e) {
-      e.printStackTrace();
-    } catch (IOException e) {
-      e.printStackTrace();
-    }
   }
 
   @Override
@@ -258,4 +257,19 @@ public void cleanupContainer(ContainerId containerId) {
       completedContainerList.add(containerId);
     }
   }
+
+  @VisibleForTesting
+  Map<ContainerId, ContainerSimulator> getRunningContainers() {
+    return runningContainers;
+  }
+
+  @VisibleForTesting
+  List<ContainerId> getAMContainers() {
+    return amContainerList;
+  }
+
+  @VisibleForTesting
+  List<ContainerId> getCompletedContainers() {
+    return completedContainerList;
+  }
 }

hadoop-tools/hadoop-sls/src/main/java/org/apache/hadoop/yarn/sls/nodemanager/NodeInfo.java

@@ -21,6 +21,8 @@
 import java.util.ArrayList;
 import java.util.List;
 
+import org.apache.hadoop.classification.InterfaceAudience.Private;
+import org.apache.hadoop.classification.InterfaceStability.Unstable;
 import org.apache.hadoop.net.Node;
 import org.apache.hadoop.yarn.api.records.ApplicationId;
 import org.apache.hadoop.yarn.api.records.ContainerExitStatus;
@@ -36,6 +38,8 @@
 import org.apache.hadoop.yarn.server.resourcemanager.rmnode
         .UpdatedContainerInfo;
 
+@Private
+@Unstable
 public class NodeInfo {
   private static int NODE_ID = 0;
 
@@ -43,6 +47,8 @@ public static NodeId newNodeID(String host, int port) {
     return NodeId.newInstance(host, port);
   }
 
+  @Private
+  @Unstable
   private static class FakeRMNodeImpl implements RMNode {
     private NodeId nodeId;
     private String hostName;

hadoop-tools/hadoop-sls/src/main/java/org/apache/hadoop/yarn/sls/scheduler/CapacitySchedulerMetrics.java

@@ -18,6 +18,11 @@
 
 package org.apache.hadoop.yarn.sls.scheduler;
 
+import org.apache.hadoop.classification.InterfaceAudience.Private;
+import org.apache.hadoop.classification.InterfaceStability.Unstable;
+
+@Private
+@Unstable
 public class CapacitySchedulerMetrics extends SchedulerMetrics {
 
   public CapacitySchedulerMetrics() {

hadoop-tools/hadoop-sls/src/main/java/org/apache/hadoop/yarn/sls/scheduler/ContainerSimulator.java

@@ -21,9 +21,13 @@
 import java.util.concurrent.Delayed;
 import java.util.concurrent.TimeUnit;
 
+import org.apache.hadoop.classification.InterfaceAudience.Private;
+import org.apache.hadoop.classification.InterfaceStability.Unstable;
 import org.apache.hadoop.yarn.api.records.ContainerId;
 import org.apache.hadoop.yarn.api.records.Resource;
 
+@Private
+@Unstable
 public class ContainerSimulator implements Delayed {
   // id
   private ContainerId id;

hadoop-tools/hadoop-sls/src/main/java/org/apache/hadoop/yarn/sls/scheduler/FairSchedulerMetrics.java

@@ -18,6 +18,8 @@
 
 package org.apache.hadoop.yarn.sls.scheduler;
 
+import org.apache.hadoop.classification.InterfaceAudience.Private;
+import org.apache.hadoop.classification.InterfaceStability.Unstable;
 import org.apache.hadoop.yarn.api.records.ApplicationAttemptId;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair
         .AppSchedulable;
@@ -28,6 +30,8 @@
 import com.codahale.metrics.Gauge;
 import org.apache.hadoop.yarn.sls.SLSRunner;
 
+@Private
+@Unstable
 public class FairSchedulerMetrics extends SchedulerMetrics {
 
   private int totalMemoryMB = Integer.MAX_VALUE;

hadoop-tools/hadoop-sls/src/main/java/org/apache/hadoop/yarn/sls/scheduler/FifoSchedulerMetrics.java

@@ -18,12 +18,16 @@
 
 package org.apache.hadoop.yarn.sls.scheduler;
 
+import org.apache.hadoop.classification.InterfaceAudience.Private;
+import org.apache.hadoop.classification.InterfaceStability.Unstable;
 import org.apache.hadoop.yarn.api.records.QueueInfo;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.fifo
         .FifoScheduler;
 
 import com.codahale.metrics.Gauge;
 
+@Private
+@Unstable
 public class FifoSchedulerMetrics extends SchedulerMetrics {
   
   public FifoSchedulerMetrics() {

hadoop-tools/hadoop-sls/src/main/java/org/apache/hadoop/yarn/sls/scheduler/NodeUpdateSchedulerEventWrapper.java

@@ -18,9 +18,13 @@
 
 package org.apache.hadoop.yarn.sls.scheduler;
 
+import org.apache.hadoop.classification.InterfaceAudience.Private;
+import org.apache.hadoop.classification.InterfaceStability.Unstable;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.event
         .NodeUpdateSchedulerEvent;
 
+@Private
+@Unstable
 public class NodeUpdateSchedulerEventWrapper extends NodeUpdateSchedulerEvent {
   
   public NodeUpdateSchedulerEventWrapper(NodeUpdateSchedulerEvent event) {

hadoop-tools/hadoop-sls/src/main/java/org/apache/hadoop/yarn/sls/scheduler/RMNodeWrapper.java

@@ -18,6 +18,8 @@
 
 package org.apache.hadoop.yarn.sls.scheduler;
 
+import org.apache.hadoop.classification.InterfaceAudience.Private;
+import org.apache.hadoop.classification.InterfaceStability.Unstable;
 import org.apache.hadoop.net.Node;
 import org.apache.hadoop.yarn.api.records.ApplicationId;
 import org.apache.hadoop.yarn.api.records.ContainerId;
@@ -33,6 +35,8 @@
 import java.util.Collections;
 import java.util.List;
 
+@Private
+@Unstable
 public class RMNodeWrapper implements RMNode {
   private RMNode node;
   private List<UpdatedContainerInfo> updates;

hadoop-tools/hadoop-sls/src/main/java/org/apache/hadoop/yarn/sls/scheduler/ResourceSchedulerWrapper.java

@@ -36,6 +36,7 @@
 import java.util.concurrent.locks.Lock;
 import java.util.concurrent.locks.ReentrantLock;
 
+import org.apache.hadoop.classification.InterfaceAudience.Private;
 import org.apache.hadoop.classification.InterfaceAudience.LimitedPrivate;
 import org.apache.hadoop.classification.InterfaceStability.Unstable;
 import org.apache.hadoop.conf.Configurable;
@@ -66,6 +67,7 @@
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.QueueMetrics;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.ResourceScheduler;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.SchedulerAppReport;
+import org.apache.hadoop.yarn.server.resourcemanager.scheduler.SchedulerApplication;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.SchedulerApplicationAttempt;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.SchedulerNode;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.SchedulerNodeReport;
@@ -92,13 +94,14 @@
 import com.codahale.metrics.SlidingWindowReservoir;
 import com.codahale.metrics.Timer;
 
+@Private
+@Unstable
 final public class ResourceSchedulerWrapper
     extends AbstractYarnScheduler<SchedulerApplicationAttempt, SchedulerNode>
     implements SchedulerWrapper, ResourceScheduler, Configurable {
   private static final String EOL = System.getProperty("line.separator");
   private static final int SAMPLING_SIZE = 60;
   private ScheduledExecutorService pool;
-  private RMContext rmContext;
   // counters for scheduler allocate/handle operations
   private Counter schedulerAllocateCounter;
   private Counter schedulerHandleCounter;
@@ -720,7 +723,7 @@ public void run() {
   public void addAMRuntime(ApplicationId appId,
                            long traceStartTimeMS, long traceEndTimeMS,
                            long simulateStartTimeMS, long simulateEndTimeMS) {
-
+    if (metricsON) {
       try {
         // write job runtime information
         StringBuilder sb = new StringBuilder();
@@ -733,6 +736,7 @@ public void addAMRuntime(ApplicationId appId,
         e.printStackTrace();
       }
     }
+  }
 
   private void updateQueueMetrics(String queue,
                                   int releasedMemory, int releasedVCores) {
@@ -916,4 +920,17 @@ public String moveApplication(ApplicationId appId, String newQueue)
   public Resource getClusterResource() {
     return null;
   }
+
+  @Override
+  public synchronized List<Container> getTransferredContainers(
+      ApplicationAttemptId currentAttempt) {
+    return new ArrayList<Container>();
+  }
+
+  @Override
+  public Map<ApplicationId, SchedulerApplication<SchedulerApplicationAttempt>>
+      getSchedulerApplications() {
+    return new HashMap<ApplicationId,
+        SchedulerApplication<SchedulerApplicationAttempt>>();
+  }
 }

hadoop-tools/hadoop-sls/src/main/java/org/apache/hadoop/yarn/sls/scheduler/SLSCapacityScheduler.java

@@ -17,6 +17,8 @@
  */
 package org.apache.hadoop.yarn.sls.scheduler;
 
+import org.apache.hadoop.classification.InterfaceAudience.Private;
+import org.apache.hadoop.classification.InterfaceStability.Unstable;
 import org.apache.hadoop.util.ShutdownHookManager;
 import org.apache.hadoop.yarn.sls.SLSRunner;
 import org.apache.hadoop.yarn.sls.conf.SLSConfiguration;
@@ -100,6 +102,8 @@
 import java.util.concurrent.locks.Lock;
 import java.util.concurrent.locks.ReentrantLock;
 
+@Private
+@Unstable
 public class SLSCapacityScheduler extends CapacityScheduler implements
         SchedulerWrapper,Configurable {
   private static final String EOL = System.getProperty("line.separator");
@@ -725,6 +729,7 @@ public void addAMRuntime(ApplicationId appId,
                            long traceStartTimeMS, long traceEndTimeMS,
                            long simulateStartTimeMS, long simulateEndTimeMS) {
 
+    if (metricsON) {
       try {
         // write job runtime information
         StringBuilder sb = new StringBuilder();
@@ -737,6 +742,7 @@ public void addAMRuntime(ApplicationId appId,
         e.printStackTrace();
       }
     }
+  }
 
   private void updateQueueMetrics(String queue,
                                   int releasedMemory, int releasedVCores) {

hadoop-tools/hadoop-sls/src/main/java/org/apache/hadoop/yarn/sls/scheduler/SchedulerMetrics.java

@@ -21,6 +21,8 @@
 import java.util.HashSet;
 import java.util.Set;
 
+import org.apache.hadoop.classification.InterfaceAudience.Private;
+import org.apache.hadoop.classification.InterfaceStability.Unstable;
 import org.apache.hadoop.yarn.api.records.ApplicationAttemptId;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler
         .ResourceScheduler;
@@ -30,6 +32,8 @@
 import com.codahale.metrics.Gauge;
 import com.codahale.metrics.MetricRegistry;
 
+@Private
+@Unstable
 public abstract class SchedulerMetrics {
   protected ResourceScheduler scheduler;
   protected Set<String> trackedQueues;

hadoop-tools/hadoop-sls/src/main/java/org/apache/hadoop/yarn/sls/scheduler/SchedulerWrapper.java

@@ -19,11 +19,15 @@
 
 import java.util.Set;
 
+import org.apache.hadoop.classification.InterfaceAudience.Private;
+import org.apache.hadoop.classification.InterfaceStability.Unstable;
 import org.apache.hadoop.yarn.api.records.ApplicationAttemptId;
 import org.apache.hadoop.yarn.api.records.ApplicationId;
 
 import com.codahale.metrics.MetricRegistry;
 
+@Private
+@Unstable
 public interface SchedulerWrapper {
 
 	public MetricRegistry getMetrics();

hadoop-tools/hadoop-sls/src/main/java/org/apache/hadoop/yarn/sls/scheduler/TaskRunner.java

@@ -25,9 +25,15 @@
 import java.util.concurrent.ThreadPoolExecutor;
 import java.util.concurrent.TimeUnit;
 
+import org.apache.hadoop.classification.InterfaceAudience.Private;
+import org.apache.hadoop.classification.InterfaceStability.Unstable;
 import org.apache.hadoop.yarn.exceptions.YarnException;
 
+@Private
+@Unstable
 public class TaskRunner {
+  @Private
+  @Unstable
   public abstract static class Task implements Runnable, Delayed {
     private long start;
     private long end;
@@ -93,12 +99,10 @@ public final void run() {
         } else {
           lastStep();
         }
-      } catch (YarnException e) {
+      } catch (Exception e) {
-        e.printStackTrace();
-      } catch (IOException e) {
-        e.printStackTrace();
-      } catch (InterruptedException e) {
         e.printStackTrace();
+        Thread.getDefaultUncaughtExceptionHandler()
+            .uncaughtException(Thread.currentThread(), e);
       }
     }
 
@@ -118,13 +122,11 @@ public int compareTo(Delayed o) {
     }
 
 
-    public abstract void firstStep()
+    public abstract void firstStep() throws Exception;
-            throws YarnException, IOException, InterruptedException;
 
-    public abstract void middleStep()
+    public abstract void middleStep() throws Exception;
-            throws YarnException, InterruptedException, IOException;
 
-    public abstract void lastStep() throws YarnException;
+    public abstract void lastStep() throws Exception;
 
     public void setEndTime(long et) {
       endTime = et;

hadoop-tools/hadoop-sls/src/main/java/org/apache/hadoop/yarn/sls/utils/SLSUtils.java

@@ -17,6 +17,8 @@
  */
 package org.apache.hadoop.yarn.sls.utils;
 
+import org.apache.hadoop.classification.InterfaceAudience.Private;
+import org.apache.hadoop.classification.InterfaceStability.Unstable;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.tools.rumen.JobTraceReader;
@@ -36,6 +38,8 @@
 import java.util.List;
 import java.util.Iterator;
 
+@Private
+@Unstable
 public class SLSUtils {
 
   public static String[] getRackHostName(String hostname) {

hadoop-tools/hadoop-sls/src/main/java/org/apache/hadoop/yarn/sls/web/SLSWebApp.java

@@ -30,6 +30,8 @@
 import javax.servlet.http.HttpServletResponse;
 
 import org.apache.commons.io.FileUtils;
+import org.apache.hadoop.classification.InterfaceAudience.Private;
+import org.apache.hadoop.classification.InterfaceStability.Unstable;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.event
         .SchedulerEventType;
 import org.mortbay.jetty.Handler;
@@ -49,6 +51,8 @@
 import com.codahale.metrics.MetricRegistry;
 import org.mortbay.jetty.handler.ResourceHandler;
 
+@Private
+@Unstable
 public class SLSWebApp extends HttpServlet {
   private static final long serialVersionUID = 1905162041950251407L;
   private transient Server server;