Merge -r 757848:757849 from trunk onto 0.20 branch. Fixes HADOOP-5231.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/core/branches/branch-0.20@757850 13f79535-47bb-0310-9956-ffa450edef68

CHANGES.txt

@@ -857,6 +857,9 @@ Release 0.19.2 - Unreleased
     HADOOP-5554. DataNodeCluster and CreateEditsLog should create blocks with
     the same generation stamp value. (hairong via szetszwo)
 
+    HADOOP-5231. Clones the TaskStatus before passing it to the JobInProgress.
+    (Amareshwari Sriramadasu via ddas)
+
 Release 0.19.1 - 2009-02-23 
 
   IMPROVEMENTS

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

@@ -3250,7 +3250,11 @@ public class JobTracker implements MRConstants, InterTrackerProtocol,
         
         // Update the job and inform the listeners if necessary
         JobStatus prevStatus = (JobStatus)job.getStatus().clone();
-        job.updateTaskStatus(tip, report);
+        // Clone TaskStatus object here, because JobInProgress
+        // or TaskInProgress can modify this object and
+        // the changes should not get reflected in TaskTrackerStatus.
+        // An old TaskTrackerStatus is used later in countMapTasks, etc.
+        job.updateTaskStatus(tip, (TaskStatus)report.clone());
         JobStatus newStatus = (JobStatus)job.getStatus().clone();
         
         // Update the listeners if an incomplete job completes