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https://issues.apache.org/jira/browse/MAPREDUCE-1974?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12990368#comment-12990368
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Scott Chen commented on MAPREDUCE-1974:
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test-patch result
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[exec] -1 overall.
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[exec] +1 @author. The patch does not contain any @author tags.
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[exec] -1 tests included. The patch doesn't appear to include any new
or modified tests.
[exec] Please justify why no new tests are needed
for this patch.
[exec] Also please list what manual steps were
performed to verify this patch.
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[exec] +1 javadoc. The javadoc tool did not generate any warning
messages.
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[exec] +1 javac. The applied patch does not increase the total number
of javac compiler warnings.
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[exec] +1 findbugs. The patch does not introduce any new Findbugs
(version 1.3.9) warnings.
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[exec] +1 release audit. The applied patch does not increase the
total number of release audit warnings.
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[exec] +1 system test framework. The patch passed system test
framework compile.
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[exec] Finished build.
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> 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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