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https://issues.apache.org/jira/browse/HADOOP-7761?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13132339#comment-13132339
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Todd Lipcon commented on HADOOP-7761:
-------------------------------------
- The findbugs warning is bogus (Token-related)
- The failed tests are also security-related (not this JIRA)
- the new javac warnings are true, but there's no way to ignore them. This is
from use of sun.misc.Unsafe.
> 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, util
> Affects Versions: 0.23.0
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Attachments: 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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