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https://issues.apache.org/jira/browse/LUCENE-3654?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13171750#comment-13171750
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Uwe Schindler commented on LUCENE-3654:
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Nice, I remember Jason brought this up!
My problem is only: sun.misc.Unsafe is undocumented, so it might not be
available on compile time. Can we handle that somehow without reflection, maybe
in a separate file where we dont fail if the javac ant task fails? I know,
Unsafe is always available, but I dont want to rely on it - maybe someone wants
to compile our code with SomeStrangeJDK™.
The other thing is the inner class holder. Can we rename it to not contain
"lexicographical", maybe UnsignedByteComparatorHolder? Lucene works on byte[]
that can be anything, even binary terms.
> Optimize BytesRef comparator to use Unsafe long based comparison (when
> possible)
> --------------------------------------------------------------------------------
>
> Key: LUCENE-3654
> URL: https://issues.apache.org/jira/browse/LUCENE-3654
> Project: Lucene - Java
> Issue Type: Improvement
> Components: core/index, core/search
> Reporter: Shay Banon
> Attachments: LUCENE-3654.patch
>
>
> Inspire by Google Guava UnsignedBytes lexi comparator, that uses unsafe to do
> long based comparisons over the bytes instead of one by one (which yields
> 2-4x better perf), use similar logic in BytesRef comparator. The code was
> adapted to support offset/length.
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