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https://issues.apache.org/jira/browse/MAPREDUCE-2702?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Arun C Murthy updated MAPREDUCE-2702:
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Attachment: MAPREDUCE-2702.patch
Updated patch, I've incorporated f/b on better docs for the api.
Regarding return value v/s exception, it's odd to throw an exception when it's
expected that many impls won't deal with it - a default impl of throwing an
exception is odd too - I've kept it as-is.
I've changed names of private apis from get(Job,Task)TempDirName to
get(Job,Task)AttemptBaseDirName.
As Sharad suggested, I'll open a new jira for the old api.
> [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: MAPREDUCE-2702.patch, MAPREDUCE-2702.patch,
> 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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