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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-5457) Add a KeyOnlyTextOutputReader to enable streaming to write out text files without separators
Date Fri, 18 Oct 2013 20:56:48 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-5457?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13799508#comment-13799508
] 

Hudson commented on MAPREDUCE-5457:
-----------------------------------

SUCCESS: Integrated in Hadoop-trunk-Commit #4630 (See [https://builds.apache.org/job/Hadoop-trunk-Commit/4630/])
MAPREDUCE-5457. Add a KeyOnlyTextOutputReader to enable streaming to write out text files
without separators (Sandy Ryza) (sandy: http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1533624)
* /hadoop/common/trunk/hadoop-mapreduce-project/CHANGES.txt
* /hadoop/common/trunk/hadoop-tools/hadoop-streaming/src/main/java/org/apache/hadoop/streaming/io/IdentifierResolver.java
* /hadoop/common/trunk/hadoop-tools/hadoop-streaming/src/main/java/org/apache/hadoop/streaming/io/KeyOnlyTextInputWriter.java
* /hadoop/common/trunk/hadoop-tools/hadoop-streaming/src/main/java/org/apache/hadoop/streaming/io/KeyOnlyTextOutputReader.java
* /hadoop/common/trunk/hadoop-tools/hadoop-streaming/src/main/java/org/apache/hadoop/streaming/io/TextInputWriter.java
* /hadoop/common/trunk/hadoop-tools/hadoop-streaming/src/test/java/org/apache/hadoop/streaming/TestStreamingOutputOnlyKeys.java
* /hadoop/common/trunk/hadoop-tools/hadoop-streaming/src/test/java/org/apache/hadoop/streaming/io
* /hadoop/common/trunk/hadoop-tools/hadoop-streaming/src/test/java/org/apache/hadoop/streaming/io/TestKeyOnlyTextOutputReader.java


> 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
>    Affects Versions: 2.1.0-beta
>            Reporter: Sandy Ryza
>            Assignee: Sandy Ryza
>             Fix For: 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.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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