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