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Nov 24, 2009, 3:46 AM
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[jira] Created: (LUCENE-2093) Use query-private scope instead of shared Term->TermInfo cache
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Use query-private scope instead of shared Term->TermInfo cache
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Key: LUCENE-2093
URL: https://issues.apache.org/jira/browse/LUCENE-2093
Project: Lucene - Java
Issue Type: Improvement
Reporter: Michael McCandless
Priority: Minor
Fix For: 3.1
Spinoff of LUCENE-2075.
We currently use a shared terms cache so multiple resolves of the same term within execution of a single query save CPU. But this ties up a good amount of long term RAM...
So, it might be better to instead create a "query private scope", where places in Lucene like the terms dict could store & retrieve results. The scope would be private to each running query, and would be GCable as soon as the query completes. Then we've have perfect within query hit rate...
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