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Posted to mapreduce-issues@hadoop.apache.org by "Hadoop QA (JIRA)" <ji...@apache.org> on 2013/08/30 01:49:52 UTC
[jira] [Commented] (MAPREDUCE-5457) Add a KeyOnlyTextOutputReader
to enable streaming to write out text files without separators
[ https://issues.apache.org/jira/browse/MAPREDUCE-5457?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13754214#comment-13754214 ]
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/12600683/MAPREDUCE-5457.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 1 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/3972//testReport/
Console output: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/3972//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.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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