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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 Sun, 28 Nov 2010 20:27:39 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-1974?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12964584#action_12964584
] 

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

Hey Matei,

Sorry for not responding on this for a while.
We have put this in production for a long while and it fixes the problem.
I think it is OK to commit this.

> 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, 0.22.0
>            Reporter: Scott Chen
>            Assignee: Scott Chen
>             Fix For: 0.22.0
>
>         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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