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https://issues.apache.org/jira/browse/HADOOP-5664?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chris Douglas updated HADOOP-5664:
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Attachment: 5664-1.patch
Moved assignment out of expression, added a comment. No functional changes.
> Use of ReentrantLock.lock() in MapOutputBuffer takes up too much cpu time
> -------------------------------------------------------------------------
>
> Key: HADOOP-5664
> URL: https://issues.apache.org/jira/browse/HADOOP-5664
> Project: Hadoop Core
> Issue Type: Bug
> Components: mapred
> Affects Versions: 0.19.1
> Reporter: Bryan Duxbury
> Assignee: Chris Douglas
> Priority: Minor
> Attachments: 5664-0.patch, 5664-1.patch
>
>
> In examining a profile of one of my mappers today, I noticed that the method
> ReentrantLock.lock() in MapTask$MapOutputBuffer seems to be taking up ~11
> seconds out of around 100 seconds total. It seems like 10% is an awfully
> large amount of time to spend in this lock.
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