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https://issues.apache.org/jira/browse/MAPREDUCE-3376?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13165940#comment-13165940
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Subroto Sanyal commented on MAPREDUCE-3376:
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@Mahadev,
Please let me know if any changes or improvements needs to be made in the patch.
> 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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