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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-1397) NullPointerException observed during task failures
Date Fri, 23 Apr 2010 12:12:50 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-1397?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12860230#action_12860230
] 

Hadoop QA commented on MAPREDUCE-1397:
--------------------------------------

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12442658/patch-1397-3.txt
  against trunk revision 936166.

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

    +1 tests included.  The patch appears to include 3 new or modified tests.

    +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 failed core unit tests.

    -1 contrib tests.  The patch failed contrib unit tests.

Test results: http://hudson.zones.apache.org/hudson/job/Mapreduce-Patch-h4.grid.sp2.yahoo.net/130/testReport/
Findbugs warnings: http://hudson.zones.apache.org/hudson/job/Mapreduce-Patch-h4.grid.sp2.yahoo.net/130/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results: http://hudson.zones.apache.org/hudson/job/Mapreduce-Patch-h4.grid.sp2.yahoo.net/130/artifact/trunk/build/test/checkstyle-errors.html
Console output: http://hudson.zones.apache.org/hudson/job/Mapreduce-Patch-h4.grid.sp2.yahoo.net/130/console

This message is automatically generated.

> NullPointerException observed during task failures
> --------------------------------------------------
>
>                 Key: MAPREDUCE-1397
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1397
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: tasktracker
>    Affects Versions: 0.20.1
>            Reporter: Ramya R
>            Assignee: Amareshwari Sriramadasu
>            Priority: Minor
>             Fix For: 0.22.0
>
>         Attachments: patch-1397-1.txt, patch-1397-2.txt, patch-1397-3.txt, patch-1397-ydist.txt,
patch-1397.txt
>
>
> In an environment where many jobs are killed simultaneously, NPEs are observed in the
TT/JT logs when a task fails. The situation is aggravated when the taskcontroller.cfg is not
configured properly. Below is the exception obtained:
> {noformat}
> INFO org.apache.hadoop.mapred.TaskInProgress: Error from <attempt_ID>:
> java.lang.Throwable: Child Error
>         at org.apache.hadoop.mapred.TaskRunner.run(TaskRunner.java:529)
> Caused by: java.lang.NullPointerException
>         at org.apache.hadoop.mapred.JvmManager$JvmManagerForType.getDetails(JvmManager.java:329)
>         at org.apache.hadoop.mapred.JvmManager$JvmManagerForType.reapJvm(JvmManager.java:315)
>         at org.apache.hadoop.mapred.JvmManager$JvmManagerForType.access$000(JvmManager.java:146)
>         at org.apache.hadoop.mapred.JvmManager.launchJvm(JvmManager.java:109)
>         at org.apache.hadoop.mapred.TaskRunner.run(TaskRunner.java:502)
>  {noformat}

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