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From "Wouter de Bie (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-4136) Hadoop streaming might succeed even through reducer fails
Date Wed, 11 Apr 2012 12:02:17 GMT
Hadoop streaming might succeed even through reducer fails
---------------------------------------------------------

                 Key: MAPREDUCE-4136
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4136
             Project: Hadoop Map/Reduce
          Issue Type: Bug
          Components: contrib/streaming
    Affects Versions: 0.20.205.0
            Reporter: Wouter de Bie


Hadoop streaming can even succeed even though the reducer has failed. This happens when Hadoop
calls {{PipeReducer.close}}, but in the mean time the reducer has failed and the process has
died. When {{clientOut_.flush()}} throws an {{IOException}} in {{PipeMapRed.mapRedFinish()}}
this exception is caught but only logged. The exit status of the child process is never checked
and task is marked as successful.

We're working on a patch.


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