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https://issues.apache.org/jira/browse/ACCUMULO-4468?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15513616#comment-15513616
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Keith Turner commented on ACCUMULO-4468:
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The network code uses the
[Key.compress()|https://github.com/apache/accumulo/blob/1a663143c4d81367f7703bceb8b24374d59c154e/core/src/main/java/org/apache/accumulo/core/data/Key.java#L1085]
and
[Key.decompress()|https://github.com/apache/accumulo/blob/1a663143c4d81367f7703bceb8b24374d59c154e/core/src/main/java/org/apache/accumulo/core/data/Key.java#L1137]
functions, maybe the test could use that to simulate what rfile does. Its
based on thrift stuff though, so it would clunky to use.
> accumulo.core.data.Key.equals(Key, PartialKey) improvement
> ----------------------------------------------------------
>
> Key: ACCUMULO-4468
> URL: https://issues.apache.org/jira/browse/ACCUMULO-4468
> Project: Accumulo
> Issue Type: Improvement
> Components: core
> Affects Versions: 1.8.0
> Reporter: Will Murnane
> Priority: Trivial
> Labels: newbie, performance
> Attachments: benchmark.tar.gz, key_comparison.patch
>
>
> In the Key.equals(Key, PartialKey) overload, the current method compares
> starting at the beginning of the key, and works its way toward the end. This
> functions correctly, of course, but one of the typical uses of this method is
> to compare adjacent rows to break them into larger chunks. For example,
> accumulo.core.iterators.Combiner repeatedly calls this method with subsequent
> pairs of keys.
> I have a patch which reverses the comparison order. That is, if the method is
> called with ROW_COLFAM_COLQUAL_COLVIS, it will compare visibility, cq, cf,
> and finally row. This (marginally) improves the speed of comparisons in the
> relatively common case where only the last part is changing, with less
> complex code.
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