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Posted to mapreduce-dev@hadoop.apache.org by "Sandy Ryza (JIRA)" <ji...@apache.org> on 2013/08/14 02:21:48 UTC

[jira] [Created] (MAPREDUCE-5457) Add a KeyOnlyTextOutputFormat to enable streaming write out text files without separators

Sandy Ryza created MAPREDUCE-5457:
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             Summary: Add a KeyOnlyTextOutputFormat to enable streaming 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
    Affects Versions: 2.1.0-beta
            Reporter: Sandy Ryza


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 that ignores values and only outputs keys would allow streaming jobs to output lines of text. 



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