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From "Runping Qi (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-4620) Streaming mapper never completes if the mapper does not write to stdout
Date Sat, 08 Nov 2008 00:52:44 GMT
Streaming mapper never completes if the mapper does not write to stdout
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                 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



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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