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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-754) NPE in expiry thread when a TT is lost
Date Mon, 09 Nov 2009 20:18:32 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-754?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12775110#action_12775110
] 

Hadoop QA commented on MAPREDUCE-754:
-------------------------------------

+1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12424195/mapreduce-754-v1.1.patch
  against trunk revision 833990.

    +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 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/232/testReport/
Findbugs warnings: http://hudson.zones.apache.org/hudson/job/Mapreduce-Patch-h6.grid.sp2.yahoo.net/232/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results: http://hudson.zones.apache.org/hudson/job/Mapreduce-Patch-h6.grid.sp2.yahoo.net/232/artifact/trunk/build/test/checkstyle-errors.html
Console output: http://hudson.zones.apache.org/hudson/job/Mapreduce-Patch-h6.grid.sp2.yahoo.net/232/console

This message is automatically generated.

> NPE in expiry thread when a TT is lost
> --------------------------------------
>
>                 Key: MAPREDUCE-754
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-754
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: jobtracker
>    Affects Versions: 0.20.1
>            Reporter: Ramya R
>            Assignee: Amar Kamat
>            Priority: Minor
>             Fix For: 0.22.0
>
>         Attachments: mapreduce-754-v1.1.patch, mapreduce-754-wip.patch
>
>
> NullPointerException is obtained in Tracker Expiry Thread. Below is the exception obtained
in the JT logs 
> {noformat}
> ERROR org.apache.hadoop.mapred.JobTracker: Tracker Expiry Thread got exception: java.lang.NullPointerException
>         at org.apache.hadoop.mapred.JobTracker.updateTaskTrackerStatus(JobTracker.java:2971)
>         at org.apache.hadoop.mapred.JobTracker.access$300(JobTracker.java:104)
>         at org.apache.hadoop.mapred.JobTracker$ExpireTrackers.run(JobTracker.java:381)
>         at java.lang.Thread.run(Thread.java:619)
> {noformat}
> The steps to reproduce this issue are:
> * Blacklist a TT. 
> * Restart it. 
> * The above exception is obtained when the first instance of TT is marked as lost.
> However the above exception does not break any functionality.

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