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https://issues.apache.org/jira/browse/MAPREDUCE-1423?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12840537#action_12840537
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Hudson commented on MAPREDUCE-1423:
-----------------------------------
Integrated in Hadoop-Mapreduce-trunk-Commit #256 (See
[http://hudson.zones.apache.org/hudson/job/Hadoop-Mapreduce-trunk-Commit/256/])
. Improve performance of CombineFileInputFormat when multiple pools are
configured. (Dhruba Borthakur via zshao)
> Improve performance of CombineFileInputFormat when multiple pools are
> configured
> --------------------------------------------------------------------------------
>
> Key: MAPREDUCE-1423
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-1423
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Components: client
> Reporter: dhruba borthakur
> Assignee: dhruba borthakur
> Fix For: 0.22.0
>
> Attachments: CombineFileInputFormatPerformance.txt,
> CombineFileInputFormatPerformance.txt
>
>
> I have a map-reduce job that is using CombineFileInputFormat. It has
> configured 10000 pools and 30000 files. The time to create the splits takes
> more than an hour. The reaosn being that CombineFileInputFormat.getSplits()
> converts the same path from String to Path object multiple times, one for
> each instance of a pool. Similarly, it calls Path.toUri(0 multiple times.
> This code can be optimized.
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