HADOOP-1011. Fix a ConcurrentModificationException when viewing job history. Contributed by Tahir.

git-svn-id: https://svn.apache.org/repos/asf/lucene/hadoop/trunk@524268 13f79535-47bb-0310-9956-ffa450edef68

CHANGES.txt

@@ -73,6 +73,9 @@ Trunk (unreleased changes)
 22. HADOOP-1178.  Fix a NullPointerException during namenode startup.
     (Dhruba Borthakur via cutting)
 
+23. HADOOP-1011.  Fix a ConcurrentModificationException when viewing
+    job history.  (Tahir Hashmi via cutting)
+
 
 Release 0.12.3 (not yet released)
 

src/java/org/apache/hadoop/mapred/JobHistory.java

@@ -266,7 +266,7 @@ public class JobHistory {
      * Reads values back from the history, input is same Map as passed to Listener by parseHistory().  
      * @param values
      */
-    public void handle(Map<Keys, String> values){
+    public synchronized void handle(Map<Keys, String> values){
       set(values); 
     }
     /**