HADOOP-1461 Add synchronization to TaskTracker to avoid deadlocks in job

cleanup.


git-svn-id: https://svn.apache.org/repos/asf/lucene/hadoop/trunk@544735 13f79535-47bb-0310-9956-ffa450edef68

CHANGES.txt

@@ -75,6 +75,8 @@ Trunk (unreleased changes)
  24. HADOOP-1429.  Stop logging exceptions during normal IPC server
      shutdown.  (stack via cutting)
 
+ 25. HADOOP-1461.  Fix the synchronization of the task tracker to
+     avoid lockups in job cleanup.  (Arun C Murthy via omalley)
 
 Release 0.13.0 - 2007-06-08
 

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

@@ -922,7 +922,7 @@ public class TaskTracker
    * @param action The action with the job
    * @throws IOException
    */
-  private void purgeJob(KillJobAction action) throws IOException {
+  private synchronized void purgeJob(KillJobAction action) throws IOException {
     String jobId = action.getJobId();
     LOG.info("Received 'KillJobAction' for job: " + jobId);
     RunningJob rjob = null;