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https://issues.apache.org/jira/browse/HADOOP-5664?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12705584#action_12705584
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Hadoop QA commented on HADOOP-5664:
-----------------------------------
-1 overall. Here are the results of testing the latest attachment
http://issues.apache.org/jira/secure/attachment/12406339/5664-0.patch
against trunk revision 771231.
+1 @author. The patch does not contain any @author tags.
-1 tests included. The patch doesn't appear to include any new or modified
tests.
Please justify why no tests are needed for this patch.
+1 javadoc. The javadoc tool did not generate any warning messages.
+1 javac. The applied patch does not increase the total number of javac
compiler warnings.
+1 findbugs. The patch does not introduce any new Findbugs warnings.
+1 Eclipse classpath. The patch retains Eclipse classpath integrity.
+1 release audit. The applied patch does not increase the total number of
release audit warnings.
-1 core tests. The patch failed core unit tests.
+1 contrib tests. The patch passed contrib unit tests.
Test results:
http://hudson.zones.apache.org/hudson/job/Hadoop-Patch-vesta.apache.org/286/testReport/
Findbugs warnings:
http://hudson.zones.apache.org/hudson/job/Hadoop-Patch-vesta.apache.org/286/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results:
http://hudson.zones.apache.org/hudson/job/Hadoop-Patch-vesta.apache.org/286/artifact/trunk/build/test/checkstyle-errors.html
Console output:
http://hudson.zones.apache.org/hudson/job/Hadoop-Patch-vesta.apache.org/286/console
This message is automatically generated.
> 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
>
>
> 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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