svn commit: r1594795 - in /hadoop/common/trunk/hadoop-mapreduce-project: CHANGES.txt hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapred/LocalContainerLauncher.java

[junping_du]

Author: junping_du
Date: Thu May 15 07:07:18 2014
New Revision: 1594795

URL: http://svn.apache.org/r1594795
Log:
MAPREDUCE-5861. finishedSubMaps field in LocalContainerLauncher does not need 
to be volatile. (Contributed by Tsuyoshi OZAWA)

Modified:
    hadoop/common/trunk/hadoop-mapreduce-project/CHANGES.txt
    
hadoop/common/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapred/LocalContainerLauncher.java

Modified: hadoop/common/trunk/hadoop-mapreduce-project/CHANGES.txt
URL: 
http://svn.apache.org/viewvc/hadoop/common/trunk/hadoop-mapreduce-project/CHANGES.txt?rev=1594795&r1=1594794&r2=1594795&view=diff
==============================================================================
--- hadoop/common/trunk/hadoop-mapreduce-project/CHANGES.txt (original)
+++ hadoop/common/trunk/hadoop-mapreduce-project/CHANGES.txt Thu May 15 
07:07:18 2014
@@ -194,6 +194,9 @@ Release 2.5.0 - UNRELEASED
     MAPREDUCE-5652. NM Recovery. ShuffleHandler should handle NM restarts.
     (Jason Lowe via kasha)
 
+    MAPREDUCE-5861. finishedSubMaps field in LocalContainerLauncher does not 
+    need to be volatile. (Tsuyoshi OZAWA via junping_du)
+
   OPTIMIZATIONS
 
   BUG FIXES 

Modified: 
hadoop/common/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapred/LocalContainerLauncher.java
URL: 
http://svn.apache.org/viewvc/hadoop/common/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapred/LocalContainerLauncher.java?rev=1594795&r1=1594794&r2=1594795&view=diff
==============================================================================
--- 
hadoop/common/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapred/LocalContainerLauncher.java
 (original)
+++ 
hadoop/common/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapred/LocalContainerLauncher.java
 Thu May 15 07:07:18 2014
@@ -177,8 +177,10 @@ public class LocalContainerLauncher exte
    */
   private class EventHandler implements Runnable {
 
-    private volatile boolean doneWithMaps = false;
-    private volatile int finishedSubMaps = 0;
+    // doneWithMaps and finishedSubMaps are accessed from only
+    // one thread. Therefore, no need to make them volatile.
+    private boolean doneWithMaps = false;
+    private int finishedSubMaps = 0;
 
     private final Map<TaskAttemptId,Future<?>> futures =
         new ConcurrentHashMap<TaskAttemptId,Future<?>>();