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Posted to mapreduce-issues@hadoop.apache.org by "Joydeep Sen Sarma (JIRA)" <ji...@apache.org> on 2011/02/03 22:50:28 UTC

[jira] Commented: (MAPREDUCE-1974) FairScheduler can preempt the same task many times

    [ https://issues.apache.org/jira/browse/MAPREDUCE-1974?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12990329#comment-12990329 ] 

Joydeep Sen Sarma commented on MAPREDUCE-1974:
----------------------------------------------

+1. this seems like a no-brainer!

> 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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