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From "Peter Bacsko (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-6870) Add configuration for MR job to finish when all reducers are complete (even with unfinished mappers)
Date Thu, 10 Aug 2017 12:30:00 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-6870?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16121541#comment-16121541
] 

Peter Bacsko commented on MAPREDUCE-6870:
-----------------------------------------

Yep, good catch. Uploading v7.

> 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
>         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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