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From "Mahadev konar (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-3376) Old mapred API combiner uses NULL reporter
Date Thu, 01 Dec 2011 09:01:42 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-3376?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13160758#comment-13160758
] 

Mahadev konar commented on MAPREDUCE-3376:
------------------------------------------

@Subroto,
 I just ran the above tests without the patch, they seems to be running fine. Didnt get a
chance to run it with the patch. Are the tests failing for you or is it just the hudson bot?
                
> 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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