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From "Sandy Ryza (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-5113) Streaming fails to set output key class when reducer is java class
Date Thu, 28 Mar 2013 20:13:16 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-5113?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13616614#comment-13616614
] 

Sandy Ryza commented on MAPREDUCE-5113:
---------------------------------------

Updated patch removes some unused imports and, in order not to change existing behavior, does
not override input/output key/value classes if the mapper/reducer is a regular java one.
                
> Streaming fails to set output key class when reducer is java class
> ------------------------------------------------------------------
>
>                 Key: MAPREDUCE-5113
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5113
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>    Affects Versions: 2.0.2-alpha
>            Reporter: Sandy Ryza
>            Assignee: Sandy Ryza
>         Attachments: HADOOP-9300-1.patch, HADOOP-9300-2.patch, HADOOP-9300-2.patch, HADOOP-9300-2.patch,
HADOOP-9300-3.patch, HADOOP-9300.patch, HADOOP-9300.patch
>
>
> In an effort to avoid overwriting user configs (MAPREDUCE-1888), StreamJob doesn't set
a job's output key/value classes unless they are specified in the streaming command line.
 If the configs aren't specified in either of these places, the streaming defaults (Text)
no longer kick in, and the global default LongWritable is used.
> This can cause jobs/output writers that are expecting Text to fail.

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