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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-2533) [hbase] Performance: Scanning, just creating MapWritable in next consumes >20% CPU
Date Thu, 10 Jan 2008 00:02:34 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-2533?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12557485#action_12557485
] 

Hadoop QA commented on HADOOP-2533:
-----------------------------------

-1 overall.  Here are the results of testing the latest attachment 
http://issues.apache.org/jira/secure/attachment/12372658/2533.patch
against trunk revision r610603.

    @author +1.  The patch does not contain any @author tags.

    patch -1.  The patch command could not apply the patch.

Console output: http://lucene.zones.apache.org:8080/hudson/job/Hadoop-Patch/1531/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
>            Priority: Minor
>             Fix For: 0.16.0
>
>         Attachments: 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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