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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-5337) JobTracker greedily schedules tasks without running tasks to join
Date Fri, 27 Mar 2009 21:05:50 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-5337?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12690099#action_12690099

Hadoop QA commented on HADOOP-5337:

-1 overall.  Here are the results of testing the latest attachment 
  against trunk revision 759030.

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

    +1 tests included.  The patch appears to include 12 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 Eclipse classpath. The patch retains Eclipse classpath integrity.

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

    -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/Hadoop-Patch-vesta.apache.org/149/testReport/
Findbugs warnings: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch-vesta.apache.org/149/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch-vesta.apache.org/149/artifact/trunk/build/test/checkstyle-errors.html
Console output: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch-vesta.apache.org/149/console

This message is automatically generated.

> JobTracker greedily schedules tasks without running tasks to join
> -----------------------------------------------------------------
>                 Key: HADOOP-5337
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5337
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: mapred
>    Affects Versions: 0.20.0
>            Reporter: Karam Singh
>            Assignee: Amar Kamat
>         Attachments: HADOOP-5337-v1.11.patch, HADOOP-5337-v1.7.patch, HADOOP-5337-v1.9.patch
> This issue was observed when JobTracker was restarted 3 times and observed that 4 instances
of each reduce task were running. This issue is observed when cluster is not fully occupied.
> In testcase: Map/reduces capacity is 200/200 slots respectively and Job profile is 11000
maps, 10 reduces and speculative execution is off.  JobTracker was restarted 3 times in small
intervals of about 5 mins and after recovery, 40 reduce tasks were running. Task details web
page (taskdetails.jsp) was  showing 4 running attempts of each reduce task.

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