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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-5457) Add a KeyOnlyTextOutputReader to enable streaming to write out text files without separators
Date Tue, 15 Oct 2013 02:46:43 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-5457?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13794815#comment-13794815
] 

Hadoop QA commented on MAPREDUCE-5457:
--------------------------------------

{color:green}+1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12608404/MAPREDUCE-5457-3.patch
  against trunk revision .

    {color:green}+1 @author{color}.  The patch does not contain any @author tags.

    {color:green}+1 tests included{color}.  The patch appears to include 2 new or modified
test files.

    {color:green}+1 javac{color}.  The applied patch does not increase the total number of
javac compiler warnings.

    {color:green}+1 javadoc{color}.  The javadoc tool did not generate any warning messages.

    {color:green}+1 eclipse:eclipse{color}.  The patch built with eclipse:eclipse.

    {color:green}+1 findbugs{color}.  The patch does not introduce any new Findbugs (version
1.3.9) warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase the total number
of release audit warnings.

    {color:green}+1 core tests{color}.  The patch passed unit tests in hadoop-tools/hadoop-streaming.

    {color:green}+1 contrib tests{color}.  The patch passed contrib unit tests.

Test results: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/4117//testReport/
Console output: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/4117//console

This message is automatically generated.

> 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
>         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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