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https://issues.apache.org/jira/browse/HBASE-4012?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13935995#comment-13935995
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Lars Hofhansl commented on HBASE-4012:
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I did some - entirely unscientific - tests on this a while ago, and in my
scenarios there was no measurable difference between the two implementations
(naive byte[] compare and the unsafe code).
> Further optimize byte comparison methods
> ----------------------------------------
>
> Key: HBASE-4012
> URL: https://issues.apache.org/jira/browse/HBASE-4012
> Project: HBase
> Issue Type: Improvement
> Components: util
> Affects Versions: 0.92.0
> Reporter: Todd Lipcon
> Assignee: Ted Yu
> Priority: Minor
> Labels: noob
> Fix For: 0.92.0
>
> Attachments: 4012-v2.txt, 4012.txt
>
>
> Guava uses some clever tricks with sun.misc.Unsafe to compare byte arrays
> about 100% faster than the naive byte-by-byte implementation:
> http://guava-libraries.googlecode.com/svn/trunk/guava/src/com/google/common/primitives/UnsignedBytes.java
> We should borrow this [Apache 2 licensed] code.
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