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https://issues.apache.org/jira/browse/HADOOP-809?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Owen O'Malley resolved HADOOP-809.
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Resolution: Cannot Reproduce
Assignee: (was: Sanjay Dahiya)
This is already available as IdentityMapper.
> Streaming should have a built in identity mapper
> ------------------------------------------------
>
> Key: HADOOP-809
> URL: https://issues.apache.org/jira/browse/HADOOP-809
> Project: Hadoop Core
> Issue Type: Improvement
> Components: contrib/streaming
> Reporter: arkady borkovsky
>
> Currently, in order to merge 2 inputs , or to feed the output of
> type-changing reduce to another reduce, one needs to use
> -mapper /bin/cat
> Streaming already has identity reducer implemented.
> Adding identity mapper will make it more conceptually clean, more efficient,
> and hopefully more reliable.
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