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Posted to common-dev@hadoop.apache.org by "Bryan Duxbury (JIRA)" <ji...@apache.org> on 2009/04/13 23:34:15 UTC

[jira] Updated: (HADOOP-5664) Use of ReentrantLock.lock() in MapOutputBuffer takes up too much cpu time

     [ https://issues.apache.org/jira/browse/HADOOP-5664?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Bryan Duxbury updated HADOOP-5664:
----------------------------------

          Environment:     (was: Cloudera's 0.18.3 distribution)
    Affects Version/s:     (was: 0.18.3)
                       0.19.1

> 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
>            Priority: Minor
>
> 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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