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https://issues.apache.org/jira/browse/MAPREDUCE-5457?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sandy Ryza updated MAPREDUCE-5457:
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Affects Version/s: (was: 2.1.0-beta)
> Add a KeyOnlyTextOutputReader to enable streaming to write out text files
> without separators
> --------------------------------------------------------------------------------------------
>
> Key: MAPREDUCE-5457
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-5457
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Reporter: Sandy Ryza
> Assignee: Sandy Ryza
> Fix For: 1.3.0, 2.2.1
>
> Attachments: MAPREDUCE-5457-1.patch, MAPREDUCE-5457-2.patch,
> MAPREDUCE-5457-3.patch, MAPREDUCE-5457-branch-1-1.patch,
> MAPREDUCE-5457-branch-1-2.patch, MAPREDUCE-5457-branch-1.patch,
> MAPREDUCE-5457.patch
>
>
> MR jobs sometimes want to just output lines of text, not key/value pairs.
> TextOutputFormat handles this by, if a null value is given, outputting only
> the key with no separator. Streaming jobs are unable to take advantage of
> this, because they can't output null values. A text output format reader
> takes each line as a key and outputs NullWritables for values would allow
> streaming jobs to output lines of text.
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