ConjunctionScorer tune-up
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Key: LUCENE-443
URL: http://issues.apache.org/jira/browse/LUCENE-443
Project: Lucene - Java
Type: Bug
Components: Search
Versions: 1.9
Environment: Linux, Java 1.5, Large Index with 4 million items and some
heavily nested boolean queries
Reporter: Abdul Chaudhry
I just recently ran a load test on the latest code from lucene , which is using
a new BooleanScore and noticed the ConjunctionScorer was crunching through
objects , especially while sorting as part of the skipTo call. It turns a
linked list into an array, sorts the array, then converts the array back to a
linked list for further processing by the scoring engines below.
'm not sure if anyone else is experiencing this as I have a very large index (>
4 million items) and I am issuing some heavily nested queries
Anyway, I decide to change the link list into an array and use a first and last
marker to "simulate" a linked list.
This scaled much better during my load test as the java gargbage collector was
less - umm - virulent
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