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https://issues.apache.org/jira/browse/HBASE-6755?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Lars Hofhansl updated HBASE-6755:
---------------------------------
Attachment: 6755-0.96.txt
Here's a simple patch.
I ran TestAtomicOperation with it a few times.
Please have a look.
> HRegion.internalObtainRowLock uses unecessary AtomicInteger
> -----------------------------------------------------------
>
> Key: HBASE-6755
> URL: https://issues.apache.org/jira/browse/HBASE-6755
> Project: HBase
> Issue Type: Bug
> Reporter: Lars Hofhansl
> Assignee: Lars Hofhansl
> Fix For: 0.96.0, 0.94.2
>
> Attachments: 6755-0.96.txt
>
>
> I was looking at HBase's implementation of locks and saw that is
> unnecessarily uses an AtomicInteger to obtain a unique lockid.
> The observation is that we only need a unique one and don't care if we happen
> to skip one.
> In a very unscientific test I saw the %system CPU reduced when the
> AtomicInteger is avoided.
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