Merge -c 1213575 from trunk to branch-0.23 to fix MAPREDUCE-3537.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-0.23@1213576 13f79535-47bb-0310-9956-ffa450edef68

hadoop-mapreduce-project/CHANGES.txt

@@ -224,6 +224,9 @@ Release 0.23.1 - Unreleased
     MAPREDUCE-3510. Capacity Scheduler inherited ACLs not displayed by mapred queue 
     -showacls (Jonathan Eagles via mahadev)
 
+    MAPREDUCE-3537. Fix race condition in DefaultContainerExecutor which led
+    to container localization occuring in wrong directories. (acmurthy) 
+
 Release 0.23.0 - 2011-11-01 
 
   INCOMPATIBLE CHANGES

hadoop-mapreduce-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/DefaultContainerExecutor.java

@@ -75,7 +75,7 @@ public class DefaultContainerExecutor extends ContainerExecutor {
   }
   
   @Override
-  public void startLocalizer(Path nmPrivateContainerTokensPath,
+  public synchronized void startLocalizer(Path nmPrivateContainerTokensPath,
       InetSocketAddress nmAddr, String user, String appId, String locId,
       List<String> localDirs, List<String> logDirs)
       throws IOException, InterruptedException {