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From "Eli Reisman (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (AVRO-939) Java: optimize BinaryData#compareBytes() to use sun.misc.Unsafe when available
Date Thu, 19 Jul 2012 16:45:35 GMT

     [ https://issues.apache.org/jira/browse/AVRO-939?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Eli Reisman updated AVRO-939:

    Attachment: AVRO-939-4.patch

No longer requires Guava imports, everything is done within FastByteComparisons.java so it
also avoids Hadoop dependencies.

> 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
>    Affects Versions: 1.7.1
>            Reporter: Doug Cutting
>         Attachments: AVRO-939-1.patch, AVRO-939-2.patch, AVRO-939-3.patch, AVRO-939-4.patch
> 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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