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https://issues.apache.org/jira/browse/HADOOP-2248?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Owen O'Malley updated HADOOP-2248:
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Attachment: counter-speedup-3.patch
I found and fixed the problem. The last problem I had fixed in the patch
introduced this bug. Thanks for catching it! I also included a testcase that
would have caught the problem.
> Word count example is spending 24% of the time in incrCounter
> -------------------------------------------------------------
>
> Key: HADOOP-2248
> URL: https://issues.apache.org/jira/browse/HADOOP-2248
> Project: Hadoop
> Issue Type: Bug
> Components: mapred
> Reporter: Owen O'Malley
> Assignee: Owen O'Malley
> Fix For: 0.16.0
>
> Attachments: counter-speedup-2.patch, counter-speedup-3.patch,
> counter-speedup.patch
>
>
> When running under the local runner with the local file system, incrementing
> the user counters is consuming 24% of the cpu.
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