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https://issues.apache.org/jira/browse/HADOOP-7761?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13420818#comment-13420818
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Scott Carey commented on HADOOP-7761:
-------------------------------------
{quote} this is much slower {quote}
It appears that I exaggerated. This is somewhat slower for small byte arrays
and somewhat faster for larger ones on a 64 bit JVM in AVRO-939. There is more
work to do to understand this and possibly improve all of it.
> Improve performance of raw comparisons
> --------------------------------------
>
> Key: HADOOP-7761
> URL: https://issues.apache.org/jira/browse/HADOOP-7761
> Project: Hadoop Common
> Issue Type: Improvement
> Components: io, performance, util
> Affects Versions: 0.23.0
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Fix For: 0.23.1
>
> Attachments: hadoop-7761.txt, hadoop-7761.txt, hadoop-7761.txt,
> hadoop-7761.txt
>
>
> Guava has a nice implementation of lexicographical byte-array comparison that
> uses sun.misc.Unsafe to compare unsigned byte arrays long-at-a-time. Their
> benchmarks show it as being 2x more CPU-efficient than the equivalent
> pure-Java implementation. We can easily integrate this into
> WritableComparator.compareBytes to improve CPU performance in the shuffle.
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