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From "Arun C Murthy (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-2702) [MR-279] OutputCommitter changes for MR Application Master recovery
Date Tue, 27 Sep 2011 07:41:12 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-2702?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13115297#comment-13115297
] 

Arun C Murthy commented on MAPREDUCE-2702:
------------------------------------------

Sharad, the approach and the patch look reasonable - I'll look more closely.

The one nit is that we need to ensure the 'old' api i.e. o.a.h.mapred.(OutputCommitter|FileOutputCommitter)
also supports this, can you please do that too? Thanks.
                
> [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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