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https://issues.apache.org/jira/browse/MAPREDUCE-1423?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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dhruba borthakur updated MAPREDUCE-1423:
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Attachment: CombineFileInputFormatPerformance.txt
The conversion of strings to Path() occurs only once. In the presence of
multiple pools, this improves performance by an order of magnitude. A job that
needed 6 hours to create splits now takes about 1.5 hours.
> 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
> Attachments: 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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