[jira] [Commented] (MAPREDUCE-2187) map tasks timeout during sorting

["Hadoop QA (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MAPREDUCE-2187?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13064758#comment-13064758 ] 

Hadoop QA commented on MAPREDUCE-2187:
--------------------------------------

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12483443/MAPREDUCE-2187-branch-MR-279.patch
  against trunk revision 1145889.

    +1 @author.  The patch does not contain any @author tags.

    +1 tests included.  The patch appears to include 3 new or modified tests.

    -1 patch.  The patch command could not apply the patch.

Console output: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/465//console

This message is automatically generated.

> map tasks timeout during sorting
> --------------------------------
>
>                 Key: MAPREDUCE-2187
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2187
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>    Affects Versions: 0.20.2, 0.20.205.0
>            Reporter: Gianmarco De Francisci Morales
>            Assignee: Anupam Seth
>         Attachments: MAPREDUCE-2187-20-security.patch, MAPREDUCE-2187-22.patch, MAPREDUCE-2187-branch-MR-279.patch, MAPREDUCE-2187-trunk.patch
>
>
> During the execution of a large job, the map tasks timeout:
> {code}
> INFO mapred.JobClient: Task Id : attempt_201010290414_60974_m_000057_1, Status : FAILED
> Task attempt_201010290414_60974_m_000057_1 failed to report status for 609 seconds. Killing!
> {code}
> The bug is in the fact that the mapper has already finished, and, according to the logs, the timeout occurs during the merge sort phase.
> The intermediate data generated by the map task is quite large. So I think this is the problem.
> The logs show that the merge-sort was running for 10 minutes when the task was killed.
> I think the mapred.Merger should call Reporter.progress() somewhere.

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