commit 54fbb85a263870f76c6d1b3423038bc03795d2c6

Author: Devaraj Das <ddas@yahoo-inc.com>
Date:   Sat Sep 18 14:10:47 2010 -0700

    Fixed a null pointer issue in purgeJob


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-0.20-security-patches@1077697 13f79535-47bb-0310-9956-ffa450edef68

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

@@ -1723,7 +1723,7 @@ public class TaskTracker implements MRConstants, TaskUmbilicalProtocol,
         // Delete the job directory for this  
         // task if the job is done/failed
         if (!rjob.keepJobFiles) {
-          removeJobFiles(rjob.jobConf.getUser(), rjob.getJobID());
+          removeJobFiles(rjob.ugi.getShortUserName(), rjob.getJobID());
         }
         // add job to user log manager
         long now = System.currentTimeMillis();