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From "Robert Joseph Evans (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-4974) Optimising the LineRecordReader initialize() method
Date Tue, 02 Apr 2013 02:23:16 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-4974?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13619455#comment-13619455
] 

Robert Joseph Evans commented on MAPREDUCE-4974:
------------------------------------------------

I pulled the patch out.  Sorry [~gera] I did not see the review board comments.  I will try
to be more complete next time. All of the other times that I have used review board the comments
were posted to the JIRA, but I guess that is not the case any more. Either way it is my fault.

The test that caught this too is TestMRKeyValueTextInputFormat.
                
> 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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