Improve performance of raw comparisons
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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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