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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