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https://issues.apache.org/jira/browse/HADOOP-2533?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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stack updated HADOOP-2533:
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Status: In Progress (was: Patch Available)
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> [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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