Faster skipTo on SegmentTermEnum
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Key: LUCENE-1437
URL: https://issues.apache.org/jira/browse/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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