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From "Robert Joseph Evans (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-3376) Old mapred API combiner uses NULL reporter
Date Wed, 23 Nov 2011 18:25:40 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-3376?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13156026#comment-13156026
] 

Robert Joseph Evans commented on MAPREDUCE-3376:
------------------------------------------------

That is what I saw too, and I thought it would be a simple fix.
                
> 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
>
> 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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