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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-6755) HRegion.internalObtainRowLock uses unecessary AtomicInteger
Date Tue, 11 Sep 2012 03:36:07 GMT
Lars Hofhansl created HBASE-6755:
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             Summary: 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
             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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