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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-1304) Add counters for task time spent in GC
Date Sat, 27 Mar 2010 10:16:27 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-1304?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12850501#action_12850501
] 

Hadoop QA commented on MAPREDUCE-1304:
--------------------------------------

+1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12439944/MAPREDUCE-1304.3.patch
  against trunk revision 928104.

    +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-h4.grid.sp2.yahoo.net/65/testReport/
Findbugs warnings: http://hudson.zones.apache.org/hudson/job/Mapreduce-Patch-h4.grid.sp2.yahoo.net/65/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results: http://hudson.zones.apache.org/hudson/job/Mapreduce-Patch-h4.grid.sp2.yahoo.net/65/artifact/trunk/build/test/checkstyle-errors.html
Console output: http://hudson.zones.apache.org/hudson/job/Mapreduce-Patch-h4.grid.sp2.yahoo.net/65/console

This message is automatically generated.

> Add counters for task time spent in GC
> --------------------------------------
>
>                 Key: MAPREDUCE-1304
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1304
>             Project: Hadoop Map/Reduce
>          Issue Type: New Feature
>          Components: task
>            Reporter: Todd Lipcon
>            Assignee: Aaron Kimball
>         Attachments: MAPREDUCE-1304.2.patch, MAPREDUCE-1304.3.patch, MAPREDUCE-1304.patch
>
>
> It's easy to grab the number of millis spent in GC (see JvmMetrics for example). Exposing
these as task counters would be handy - occasionally I've seen user jobs where long GC pauses
cause big "unexplainable" performance problems, and a large counter would make it obvious
to the user what's going on.

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