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From "Ravi Gummadi (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4620) Streaming mapper never completes if the mapper does not write to stdout
Date Wed, 10 Dec 2008 05:06:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4620?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12655096#action_12655096
] 

Ravi Gummadi commented on HADOOP-4620:
--------------------------------------

HADOOP17-4620.patch is for branch 17. Patch HADOOP-4620.patch applies fine to trunk and version
0.18.2
Here are the results of testing HADOOP-4620.patch :

+1 overall.

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

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

    +1 javadoc. The javadoc tool did not generate any warning messages.

    +1 javac. The applied patch does not increase the total number of javac compiler warnings.

    +1 findbugs. The patch does not introduce any new Findbugs warnings.

    +1 Eclipse classpath. The patch retains Eclipse classpath integrity.


Unit tests also passed on my machine.

> Streaming mapper never completes if the mapper does not write to stdout
> -----------------------------------------------------------------------
>
>                 Key: HADOOP-4620
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4620
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: mapred
>    Affects Versions: 0.17.2
>            Reporter: Runping Qi
>            Assignee: Ravi Gummadi
>         Attachments: HADOOP-4620.patch, HADOOP17-4620.patch, solves_mapper_4620.patch
>
>
> A mapper of a streaming job has empty input data and thus it produces no output.
> The task never completes.
> The following are the last two lines from the task log:
> 2008-11-07 21:59:48,254 INFO org.apache.hadoop.streaming.PipeMapRed: PipeMapRed exec
[/usr/bin/perl, xxx]
> 2008-11-07 21:59:48,330 INFO org.apache.hadoop.streaming.PipeMapRed: mapRedFinished
>  

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