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Date: Wed, 30 Nov 2011 10:21:40 +0000 (UTC)
From: "Subroto Sanyal (Commented) (JIRA)" <jira@apache.org>
To: mapreduce-issues@hadoop.apache.org
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Subject: [jira] [Commented] (MAPREDUCE-3376) Old mapred API combiner uses
 NULL reporter
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    [ https://issues.apache.org/jira/browse/MAPREDUCE-3376?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13159958#comment-13159958 ] 

Subroto Sanyal commented on MAPREDUCE-3376:
-------------------------------------------

The testcase failure and findbug comments are unrelated to patch.
The TestCode uses Depricated APIs and for the same *@SuppressWarnings("deprecation")* is also used.
                
> Old mapred API combiner uses NULL reporter
> ------------------------------------------
>
>                 Key: MAPREDUCE-3376
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3376
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mrv1, mrv2
>    Affects Versions: 0.20.205.0, 0.23.0, 0.24.0
>            Reporter: Robert Joseph Evans
>            Assignee: Subroto Sanyal
>             Fix For: 0.23.1
>
>         Attachments: MAPREDUCE-3376.patch
>
>
> The OldCombinerRunner class inside Task.java uses a NULL Reporter.  If the combiner code runs for an extended period of time, even with reporting progress as it should, the map task can timeout and be killed.  It appears that the NewCombinerRunner class uses a valid reporter and as such is not impacted by this bug.

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