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