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From "Scott Chen (JIRA)" <j...@apache.org>
Subject [jira] Created: (MAPREDUCE-1974) FairScheduler can preempt the same task many times
Date Tue, 27 Jul 2010 23:37:16 GMT
FairScheduler can preempt the same task many times
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                 Key: MAPREDUCE-1974
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1974
             Project: Hadoop Map/Reduce
          Issue Type: Bug
            Reporter: Scott Chen
            Assignee: Scott Chen


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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