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From "Mark Harwood (JIRA)" <>
Subject [jira] Created: (LUCENE-1437) Faster skipTo on SegmentTermEnum
Date Mon, 03 Nov 2008 14:27:44 GMT
Faster skipTo on SegmentTermEnum

                 Key: LUCENE-1437
             Project: Lucene - Java
          Issue Type: Improvement
          Components: Index
    Affects Versions: 2.4
            Reporter: Mark Harwood
            Priority: Minor
         Attachments: fasterSkip.patch

I've been trying to speed up function I have that involves calling TermEnum.skipTo a lot on
a very large index with many terms.
This patch avoids excessive object creation of Term objects as part of the default implementation
in the TermEnum base class.

My tests output with this patch was as follows:
    Took 1894 ms for 42304 calls to skipTo on index with 182693176 docs 
and unmodified Lucene 2.4 results were:
    Took 2438 ms for 42304 calls to skipTo on index with 182693176 docs 

The logic is based on the existing code in SegmentTermEnum. scanTo(Term term) and avoids the
object construction code found in the TermEnum.skipTo code which repeatedly calls next() and
term() to create Term objects.

Anyone see any negative side effects in changing this?

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