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https://issues.apache.org/jira/browse/MAPREDUCE-4974?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13619696#comment-13619696
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Hudson commented on MAPREDUCE-4974:
-----------------------------------
Integrated in Hadoop-Yarn-trunk #173 (See
[https://builds.apache.org/job/Hadoop-Yarn-trunk/173/])
Reverted MAPREDUCE-4974 because of test failures. (Revision 1463359)
MAPREDUCE-4974. Optimising the LineRecordReader initialize() method (Gelesh via
bobby) (Revision 1463221)
Result = SUCCESS
bobby : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1463359
Files :
* /hadoop/common/trunk/hadoop-mapreduce-project/CHANGES.txt
*
/hadoop/common/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/lib/input/LineRecordReader.java
bobby : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1463221
Files :
* /hadoop/common/trunk/hadoop-mapreduce-project/CHANGES.txt
*
/hadoop/common/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/lib/input/LineRecordReader.java
> Optimising the LineRecordReader initialize() method
> ---------------------------------------------------
>
> Key: MAPREDUCE-4974
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4974
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Components: mrv1, mrv2, performance
> Affects Versions: 2.0.2-alpha, 0.23.5
> Environment: Hadoop Linux
> Reporter: Arun A K
> Assignee: Gelesh
> Labels: patch, performance
> Fix For: 0.23.7, 2.0.5-beta
>
> Attachments: MAPREDUCE-4974.2.patch, MAPREDUCE-4974.3.patch,
> MAPREDUCE-4974.4.patch
>
> Original Estimate: 1h
> Remaining Estimate: 1h
>
> I found there is a a scope of optimizing the code, over initialize() if we
> have compressionCodecs & codec instantiated only if its a compressed input.
> Mean while Gelesh George Omathil, added if we could avoid the null check of
> key & value. This would time save, since for every next key value generation,
> null check is done. The intention being to instantiate only once and avoid
> NPE as well. Hope both could be met if initialize key & value over
> initialize() method. We both have worked on it.
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