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Date: Thu, 4 Dec 2008 11:30:44 -0800 (PST)
From: "Runping Qi (JIRA)" <jira@apache.org>
To: core-dev@hadoop.apache.org
Subject: [jira] Commented: (HADOOP-4620) Streaming mapper never completes if
 the mapper does not write to stdout
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    [ https://issues.apache.org/jira/browse/HADOOP-4620?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12653425#action_12653425 ] 

Runping Qi commented on HADOOP-4620:
------------------------------------


I see.

If we take this approach, the StreamJob needs to set the map runner  class too when it sets the mapper class.
  

> 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
>
> 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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