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https://issues.apache.org/jira/browse/MAPREDUCE-6870?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16162015#comment-16162015
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Erik Krogen commented on MAPREDUCE-6870:
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Good idea, [~andrew.wang], thanks for the reminder. Done.
> Add configuration for MR job to finish when all reducers are complete (even
> with unfinished mappers)
> ----------------------------------------------------------------------------------------------------
>
> Key: MAPREDUCE-6870
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-6870
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Affects Versions: 2.6.1
> Reporter: Zhe Zhang
> Assignee: Peter Bacsko
> Fix For: 3.0.0-beta1
>
> Attachments: MAPREDUCE-6870-001.patch, MAPREDUCE-6870-002.patch,
> MAPREDUCE-6870-003.patch, MAPREDUCE-6870-004.patch, MAPREDUCE-6870-005.patch,
> MAPREDUCE-6870-006.patch, MAPREDUCE-6870-007.patch
>
>
> Even with MAPREDUCE-5817, there could still be cases where mappers get
> scheduled before all reducers are complete, but those mappers run for long
> time, even after all reducers are complete. This could hurt the performance
> of large MR jobs.
> In some cases, mappers don't have any materialize-able outcome other than
> providing intermediate data to reducers. In that case, the job owner should
> have the config option to finish the job once all reducers are complete.
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