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https://issues.apache.org/jira/browse/HADOOP-2533?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12558365#action_12558365
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Hadoop QA commented on HADOOP-2533:
-----------------------------------
+1 overall. Here are the results of testing the latest attachment
http://issues.apache.org/jira/secure/attachment/12373037/2533-v3.patch
against trunk revision r611537.
@author +1. The patch does not contain any @author tags.
javadoc +1. The javadoc tool did not generate any warning messages.
javac +1. The applied patch does not generate any new compiler warnings.
findbugs +1. The patch does not introduce any new Findbugs warnings.
core tests +1. The patch passed core unit tests.
contrib tests +1. The patch passed contrib unit tests.
Test results:
http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Patch/1567/testReport/
Findbugs warnings:
http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Patch/1567/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results:
http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Patch/1567/artifact/trunk/build/test/checkstyle-errors.html
Console output:
http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Patch/1567/console
This message is automatically generated.
> [hbase] Performance: Scanning, just creating MapWritable in next consumes
> >20% CPU
> ----------------------------------------------------------------------------------
>
> Key: HADOOP-2533
> URL: https://issues.apache.org/jira/browse/HADOOP-2533
> Project: Hadoop
> Issue Type: Improvement
> Components: contrib/hbase
> Reporter: stack
> Assignee: stack
> Priority: Minor
> Fix For: 0.16.0
>
> Attachments: 2533-v2.patch, 2533-v3.patch, 2533.patch, dirty.patch
>
>
> Every call to HScanner.next creates an instance of MapWritable. MapWritables
> are expensive. Watching a scan run in the profiler, the setup of the
> MapWritable -- filling out the idToClassMap and classToIdMap -- consumes 20%
> of all CPU.
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