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From "Scott Chen (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-1974) FairScheduler can preempt the same task many times
Date Thu, 03 Feb 2011 23:00:29 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-1974?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12990356#comment-12990356
] 

Scott Chen commented on MAPREDUCE-1974:
---------------------------------------

{code}

     [exec]
     [exec] BUILD SUCCESSFUL
     [exec] Total time: 2 minutes 15 seconds
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     [exec] +1 overall.
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     [exec]     +1 @author.  The patch does not contain any @author tags.
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     [exec]     +1 tests included.  The patch appears to include 3 new or modified tests.
     [exec]
     [exec]     +1 javadoc.  The javadoc tool did not generate any warning messages.
     [exec]
     [exec]     +1 javac.  The applied patch does not increase the total number of javac compiler
warnings.
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     [exec]     +1 findbugs.  The patch does not introduce any new Findbugs (version 1.3.9)
warnings.
     [exec]
     [exec]     +1 release audit.  The applied patch does not increase the total number of
release audit warnings.
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     [exec]     +1 system test framework.  The patch passed system test framework compile.
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     [exec] ======================================================================
     [exec] ======================================================================
     [exec]     Finished build.
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{code}

> FairScheduler can preempt the same task many times
> --------------------------------------------------
>
>                 Key: MAPREDUCE-1974
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1974
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: contrib/fair-share
>    Affects Versions: 0.21.0, 0.21.1, 0.22.0, 0.23.0
>            Reporter: Scott Chen
>            Assignee: Scott Chen
>         Attachments: MAPREDUCE-1974.txt
>
>
> In FairScheduler.preemptTasks(), tasks are collected from JobInProgress.runningMapCache.
> But tasks repeat multiple times in  JobInProgress.runningMapCache (on rack, node and
cluster).
> This makes FairScheduler preempt the same task many times.

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