svn merge -c 1343290. Backport of HADOOP-8358 to branch-2. (harsh)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1343294 13f79535-47bb-0310-9956-ffa450edef68

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

@@ -26,6 +26,8 @@ Release 2.0.1-alpha - UNRELEASED
 
     HADOOP-8323. Add javadoc and tests for Text.clear() behavior (harsh)
 
+    HADOOP-8358. Config-related WARN for dfs.web.ugi can be avoided. (harsh)
+
   BUG FIXES
 
     HADOOP-8372. NetUtils.normalizeHostName() incorrectly handles hostname

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

@@ -20,6 +20,7 @@ package org.apache.hadoop.fs;
 
 import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.classification.InterfaceStability;
+import org.apache.hadoop.http.lib.StaticUserWebFilter;
 
 /** 
  * This class contains constants for configuration keys used
@@ -161,5 +162,12 @@ public class CommonConfigurationKeys extends CommonConfigurationKeysPublic {
     "ha.failover-controller.cli-check.rpc-timeout.ms";
   public static final int HA_FC_CLI_CHECK_TIMEOUT_DEFAULT = 20000;
 
+  /** Static user web-filter properties.
+   * See {@link StaticUserWebFilter}.
+   */
+  public static final String HADOOP_HTTP_STATIC_USER =
+    "hadoop.http.staticuser.user";
+  public static final String DEFAULT_HADOOP_HTTP_STATIC_USER =
+    "dr.who";
 }
 

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/http/lib/StaticUserWebFilter.java

@@ -37,15 +37,15 @@ import org.apache.hadoop.http.FilterInitializer;
 
 import javax.servlet.Filter;
 
+import static org.apache.hadoop.fs.CommonConfigurationKeys.HADOOP_HTTP_STATIC_USER;
+import static org.apache.hadoop.fs.CommonConfigurationKeys.DEFAULT_HADOOP_HTTP_STATIC_USER;
+
 /**
  * Provides a servlet filter that pretends to authenticate a fake user (Dr.Who)
  * so that the web UI is usable for a secure cluster without authentication.
  */
 public class StaticUserWebFilter extends FilterInitializer {
   static final String DEPRECATED_UGI_KEY = "dfs.web.ugi";
-  
-  static final String USERNAME_KEY = "hadoop.http.staticuser.user";
-  static final String USERNAME_DEFAULT = "dr.who";
 
   private static final Log LOG = LogFactory.getLog(StaticUserWebFilter.class);
 
@@ -112,7 +112,7 @@ public class StaticUserWebFilter extends FilterInitializer {
 
     @Override
     public void init(FilterConfig conf) throws ServletException {
-      this.username = conf.getInitParameter(USERNAME_KEY);
+      this.username = conf.getInitParameter(HADOOP_HTTP_STATIC_USER);
       this.user = new User(username);
     }
     
@@ -123,7 +123,7 @@ public class StaticUserWebFilter extends FilterInitializer {
     HashMap<String, String> options = new HashMap<String, String>();
     
     String username = getUsernameFromConf(conf);
-    options.put(USERNAME_KEY, username);
+    options.put(HADOOP_HTTP_STATIC_USER, username);
 
     container.addFilter("static_user_filter", 
                         StaticUserFilter.class.getName(), 
@@ -139,11 +139,12 @@ public class StaticUserWebFilter extends FilterInitializer {
       // We can't use the normal configuration deprecation mechanism here
       // since we need to split out the username from the configured UGI.
       LOG.warn(DEPRECATED_UGI_KEY + " should not be used. Instead, use " + 
-               USERNAME_KEY + ".");
+          HADOOP_HTTP_STATIC_USER + ".");
       String[] parts = oldStyleUgi.split(",");
       return parts[0];
     } else {
-      return conf.get(USERNAME_KEY, USERNAME_DEFAULT);
+      return conf.get(HADOOP_HTTP_STATIC_USER,
+        DEFAULT_HADOOP_HTTP_STATIC_USER);
     }
   }
 

hadoop-common-project/hadoop-common/src/main/resources/core-default.xml

@@ -944,4 +944,15 @@
   </description>
 </property>
 
+
+<!-- Static Web User Filter properties. -->
+<property>
+  <description>
+    The user name to filter as, on static web filters
+    while rendering content. An example use is the HDFS
+    web UI (user to be used for browsing files).
+  </description>
+  <name>hadoop.http.staticuser.user</name>
+  <value>dr.who</value>
+</property>
 </configuration>

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/http/lib/TestStaticUserWebFilter.java

@@ -27,6 +27,7 @@ import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletRequestWrapper;
 
 import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.CommonConfigurationKeys;
 import org.apache.hadoop.http.lib.StaticUserWebFilter.StaticUserFilter;
 import org.junit.Test;
 import org.mockito.ArgumentCaptor;
@@ -36,7 +37,7 @@ public class TestStaticUserWebFilter {
   private FilterConfig mockConfig(String username) {
     FilterConfig mock = Mockito.mock(FilterConfig.class);
     Mockito.doReturn(username).when(mock).getInitParameter(
-        StaticUserWebFilter.USERNAME_KEY);
+        CommonConfigurationKeys.HADOOP_HTTP_STATIC_USER);
     return mock;
   }
   
@@ -73,7 +74,7 @@ public class TestStaticUserWebFilter {
   @Test
   public void testConfiguration() {
     Configuration conf = new Configuration();
-    conf.set(StaticUserWebFilter.USERNAME_KEY, "joe");
+    conf.set(CommonConfigurationKeys.HADOOP_HTTP_STATIC_USER, "joe");
     assertEquals("joe", StaticUserWebFilter.getUsernameFromConf(conf));
   }
 

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/common/JspHelper.java

@@ -71,10 +71,12 @@ import org.apache.hadoop.security.authorize.ProxyUsers;
 import org.apache.hadoop.security.token.Token;
 import org.apache.hadoop.util.VersionInfo;
 
+import static org.apache.hadoop.fs.CommonConfigurationKeys.HADOOP_HTTP_STATIC_USER;
+import static org.apache.hadoop.fs.CommonConfigurationKeys.DEFAULT_HADOOP_HTTP_STATIC_USER;
+
 @InterfaceAudience.Private
 public class JspHelper {
   public static final String CURRENT_CONF = "current.conf";
-  final static public String WEB_UGI_PROPERTY_NAME = DFSConfigKeys.DFS_WEB_UGI_KEY;
   public static final String DELEGATION_PARAMETER_NAME = DelegationParam.NAME;
   public static final String NAMENODE_ADDRESS = "nnaddr";
   static final String SET_DELEGATION = "&" + DELEGATION_PARAMETER_NAME +
@@ -483,11 +485,12 @@ public class JspHelper {
    */
   public static UserGroupInformation getDefaultWebUser(Configuration conf
                                                        ) throws IOException {
-    String[] strings = conf.getStrings(JspHelper.WEB_UGI_PROPERTY_NAME);
-    if (strings == null || strings.length == 0) {
+    String user = conf.get(
+        HADOOP_HTTP_STATIC_USER, DEFAULT_HADOOP_HTTP_STATIC_USER);
+    if (user == null || user.length() == 0) {
       throw new IOException("Cannot determine UGI from request or conf");
     }
-    return UserGroupInformation.createRemoteUser(strings[0]);
+    return UserGroupInformation.createRemoteUser(user);
   }
 
   private static InetSocketAddress getNNServiceAddress(ServletContext context,

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

@@ -239,14 +239,6 @@
   left empty in a non-HA cluster.
   </description>
 </property>
-  
-<property>
-  <name>dfs.web.ugi</name>
-  <value>webuser,webgroup</value>
-  <description>The user account used by the web interface.
-    Syntax: USERNAME,GROUP1,GROUP2, ...
-  </description>
-</property>
 
 <property>
   <name>dfs.permissions.enabled</name>