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Date: Wed, 21 Oct 2009 08:35:59 +0000 (UTC)
From: "Hadoop QA (JIRA)" <jira@apache.org>
To: mapreduce-issues@hadoop.apache.org
Subject: [jira] Commented: (MAPREDUCE-1089) Fair Scheduler preemption
 triggers NPE when tasks are scheduled but not running
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    [ https://issues.apache.org/jira/browse/MAPREDUCE-1089?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12768130#action_12768130 ] 

Hadoop QA commented on MAPREDUCE-1089:
--------------------------------------

+1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12421790/mapreduce-1089.txt
  against trunk revision 827884.

    +1 @author.  The patch does not contain any @author tags.

    -1 tests included.  The patch doesn't appear to include any new or modified tests.
                        Please justify why no new tests are needed for this patch.
                        Also please list what manual steps were performed to verify this patch.

    +1 javadoc.  The javadoc tool did not generate any warning messages.

    +1 javac.  The applied patch does not increase the total number of javac compiler warnings.

    +1 findbugs.  The patch does not introduce any new Findbugs warnings.

    +1 release audit.  The applied patch does not increase the total number of release audit warnings.

    +1 core tests.  The patch passed core unit tests.

    +1 contrib tests.  The patch passed contrib unit tests.

Test results: http://hudson.zones.apache.org/hudson/job/Mapreduce-Patch-h6.grid.sp2.yahoo.net/196/testReport/
Findbugs warnings: http://hudson.zones.apache.org/hudson/job/Mapreduce-Patch-h6.grid.sp2.yahoo.net/196/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results: http://hudson.zones.apache.org/hudson/job/Mapreduce-Patch-h6.grid.sp2.yahoo.net/196/artifact/trunk/build/test/checkstyle-errors.html
Console output: http://hudson.zones.apache.org/hudson/job/Mapreduce-Patch-h6.grid.sp2.yahoo.net/196/console

This message is automatically generated.

> Fair Scheduler preemption triggers NPE when tasks are scheduled but not running
> -------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-1089
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1089
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: contrib/fair-share
>    Affects Versions: 0.21.0
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>         Attachments: mapreduce-1089.txt
>
>
> We see exceptions like this when preemption runs when a task has been scheduled on a TT but has not yet started running.
> 2009-10-09 14:30:53,989 INFO org.apache.hadoop.mapred.FairScheduler: Should preempt 2 MAP tasks for job_200910091420_0006: tasksDueToMinShare = 2, tasksDueToFairShare = 0
> 2009-10-09 14:30:54,036 ERROR org.apache.hadoop.mapred.FairScheduler: Exception in fair scheduler UpdateThread
> java.lang.NullPointerException
>         at org.apache.hadoop.mapred.FairScheduler$2.compare(FairScheduler.java:1015)
>         at org.apache.hadoop.mapred.FairScheduler$2.compare(FairScheduler.java:1013)
>         at java.util.Arrays.mergeSort(Arrays.java:1270)
>         at java.util.Arrays.sort(Arrays.java:1210)
>         at java.util.Collections.sort(Collections.java:159)
>         at org.apache.hadoop.mapred.FairScheduler.preemptTasks(FairScheduler.java:1013)
>         at org.apache.hadoop.mapred.FairScheduler.preemptTasksIfNecessary(FairScheduler.java:911)
>         at org.apache.hadoop.mapred.FairScheduler$UpdateThread.run(FairScheduler.java:286)

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