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From "Bhallamudi Venkata Siva Kamesh (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAPREDUCE-3471) Provide NullOutputCommitter
Date Mon, 20 Feb 2012 08:19:43 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-3471?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Bhallamudi Venkata Siva Kamesh updated MAPREDUCE-3471:

    Attachment: MAPREDUCE-3471.patch

I encountered the importance of *NullOutputCommitter*, when I was debugging [MAPREDUCE-3130|https://issues.apache.org/jira/browse/MAPREDUCE-3130].
I fixed this by setting *OutputCommitter* class of FileOutputFormat as *NullOutputCommitter*.
Again for setting this, we need to fix [MAPREDUCE-2493|https://issues.apache.org/jira/browse/MAPREDUCE-2493].

Also, OC implementation of NOF returns true for isRecoverySupported(). Why do we need this?

Providing patch, thinking it may be useful.
> Provide NullOutputCommitter
> ---------------------------
>                 Key: MAPREDUCE-3471
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3471
>             Project: Hadoop Map/Reduce
>          Issue Type: New Feature
>            Reporter: Bhallamudi Venkata Siva Kamesh
>         Attachments: MAPREDUCE-3471.patch
> Hadoop by default provides only FileOutputCommitter and the same has been used internally
except in the NOF.
> There are cases where using FOC is not much appropriate.
> Example
> DBOutputFormat instantiates FOC, though it does nothing.
> I think using NOC will be much more appropriate here.
> And also it can be used along with other OFs, where taking special care of the task/job
output directories may not be required.

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