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https://issues.apache.org/jira/browse/MAPREDUCE-4974?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13570154#comment-13570154
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Gelesh commented on MAPREDUCE-4974:
-----------------------------------
Its a improvement to the existing, no new features added or deleted,
And hence, existing test case would suffice.
> 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: 0.20.204.0, 0.24.0
>
> Attachments: MAPREDUCE-4974.1.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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