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https://issues.apache.org/jira/browse/MAPREDUCE-4013?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13230047#comment-13230047
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Amar Kamat commented on MAPREDUCE-4013:
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BTW, the job has some failed map tasks.
> Reduce task gets stuck when a M/R job is configured to tolerate failures
> ------------------------------------------------------------------------
>
> Key: MAPREDUCE-4013
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4013
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: mrv2
> Affects Versions: 0.23.2
> Reporter: Amar Kamat
> Priority: Blocker
> Labels: shuffle
> Fix For: 0.24.0
>
>
> When a M/R job is configured to run with some tolerance to task failures (via
> mapreduce.map.failures.maxpercent), then the reduce task of that job gets
> stuck in the shuffle phase.
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