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Posted to mapreduce-dev@hadoop.apache.org by "Wouter de Bie (Created) (JIRA)" <ji...@apache.org> on 2012/04/11 14:02:17 UTC

[jira] [Created] (MAPREDUCE-4136) Hadoop streaming might succeed even through reducer fails

Hadoop streaming might succeed even through reducer fails
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                 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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