[jira] [Commented] (AVRO-939) Java: optimize BinaryData#compareBytes() to use sun.misc.Unsafe when available

["Joey Echeverria (Commented) (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/AVRO-939?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13196397#comment-13196397 ] 

Joey Echeverria commented on AVRO-939:
--------------------------------------

The Google Code Search link doesn't work because it's been shutdown. Here's a (hopefully) permanent link to the compare() method:

http://code.google.com/p/guava-libraries/source/browse/guava/src/com/google/common/primitives/UnsignedBytes.java?r=5fe70b8509b2a14787d3823b5f928ef399a7afdc#274
                
> Java: optimize BinaryData#compareBytes() to use sun.misc.Unsafe when available
> ------------------------------------------------------------------------------
>
>                 Key: AVRO-939
>                 URL: https://issues.apache.org/jira/browse/AVRO-939
>             Project: Avro
>          Issue Type: New Feature
>          Components: java
>            Reporter: Doug Cutting
>
> Google's Guava libraries include an optimized implementation of lexicographic byte comparison based on sun.misc.Unsafe that's ~4x faster than the normal Java implementation.
> http://hiroshiyamauchi.blogspot.com/2010/08/fast-unsigned-byte-lexicographical.html
> http://www.google.com/codesearch#UKMs0lhE9bg/trunk/src/com/google/common/primitives/UnsignedBytes.java&l=276
> We might similarly optimize BinaryData#compareBytes().

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