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From "Scott Chen (JIRA)" <j...@apache.org>
Subject [jira] Updated: (MAPREDUCE-1974) FairScheduler can preempt the same task many times
Date Mon, 29 Nov 2010 18:11:13 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-1974?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Scott Chen updated MAPREDUCE-1974:
----------------------------------

        Fix Version/s: 0.23.0
                       0.21.1
    Affects Version/s: 0.23.0
                       0.21.1
               Status: Patch Available  (was: Open)

> 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
>             Fix For: 0.21.1, 0.22.0, 0.23.0
>
>         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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