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https://issues.apache.org/jira/browse/MAPREDUCE-2702?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13116228#comment-13116228
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Sharad Agarwal commented on MAPREDUCE-2702:
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can be done as separate jira for old api. anyway if the outputcommitter doesn't
support recovery (the default), the MR AM falls back to rerun the job from
beginning.
> [MR-279] OutputCommitter changes for MR Application Master recovery
> -------------------------------------------------------------------
>
> Key: MAPREDUCE-2702
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-2702
> Project: Hadoop Map/Reduce
> Issue Type: New Feature
> Components: mrv2
> Reporter: Sharad Agarwal
> Assignee: Sharad Agarwal
> Priority: Blocker
> Attachments: mr2702_v1.patch, mr2702_v2.patch, mr2702_v3.patch,
> mr2702_v4.patch
>
>
> In MR AM recovers from a crash, it only reruns the non completed tasks. The
> completed tasks (along with their output, if any) needs to be recovered from
> the previous life. This would require some changes in OutputCommitter.
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