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From "Ming Ma (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-5652) NM Recovery. ShuffleHandler should handle NM restarts
Date Wed, 23 Apr 2014 20:16:22 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-5652?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13978830#comment-13978830
] 

Ming Ma commented on MAPREDUCE-5652:
------------------------------------

Thanks, Jason. It is good to know it will be taken care of at YARN layer. I will post some
more comments at YARN-1336.

1. Does leveDB's delete method throw exception? JNI has some exception handling and the caller
needs to retrieve the exceptions, etc.
2. It seems like recover/restore are common in NM/RM restart. Any abstract interface defined
for that?

> NM Recovery. ShuffleHandler should handle NM restarts
> -----------------------------------------------------
>
>                 Key: MAPREDUCE-5652
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5652
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>    Affects Versions: 2.2.0
>            Reporter: Karthik Kambatla
>            Assignee: Jason Lowe
>              Labels: shuffle
>         Attachments: MAPREDUCE-5652-v2.patch, MAPREDUCE-5652-v3.patch, MAPREDUCE-5652-v4.patch,
MAPREDUCE-5652-v5.patch, MAPREDUCE-5652-v6.patch, MAPREDUCE-5652.patch
>
>
> ShuffleHandler should work across NM restarts and not require re-running map-tasks. On
NM restart, the map outputs are cleaned up requiring re-execution of map tasks and should
be avoided.



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