[jira] [Updated] (HBASE-6755) HRegion.internalObtainRowLock uses unecessary AtomicInteger

["Lars Hofhansl (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-6755?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Lars Hofhansl updated HBASE-6755:
---------------------------------

    Resolution: Won't Fix
        Status: Resolved  (was: Patch Available)

Closing.
                
> 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
>            Priority: Minor
>         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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