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From "Vinod Kumar Vavilapalli (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-2480) MR-279: mr app should not depend on hard-coded version of shuffle
Date Tue, 10 May 2011 05:52:09 GMT

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Vinod Kumar Vavilapalli commented on MAPREDUCE-2480:
----------------------------------------------------

bq. However a bigger issue is whether app (a user land module) should depend on a specific
implementation shuffle (loaded into node manager). I think it should not. The MAPREDUCE_SERVICE_ID
should probably resides in a MRServices class in mr common. I have the impression (based on
previous conversations) that Chris was gonna refactor the NM service stuff later. It's probably
OK as is now.

No, that isn't quite correct. An app really SHOULD depend on a specific implementation of
shuffle. An app is tied to a specific version of shuffle be it the request format or the authentication
data. Shuffle Service isn't really 'known' to the NM, it is an abstract service started by
NM.

> MR-279: mr app should not depend on hard-coded version of shuffle
> -----------------------------------------------------------------
>
>                 Key: MAPREDUCE-2480
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2480
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mrv2
>            Reporter: Luke Lu
>            Assignee: Luke Lu
>             Fix For: 0.23.0
>
>         Attachments: mr-2480-shuffle-version-v1.patch
>
>
> The following commit introduced a dependency of shuffle with hard-coded version for mr
app:
> {noformat}
> commit 6f69742140516be7493c9a9177b81d0516cc9539
> Author: Vinod Kumar Vavilapalli <vinodkv@apache.org>
> Date:   Wed May 4 06:53:52 2011 +0000
>     Adding user log handling for YARN. Making NM put the user-logs on DFS and providing
log-dump tools. Contributed by Vinod Kumar Vavilapalli.
> {noformat}

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