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https://issues.apache.org/jira/browse/LUCENE-2093?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12781910#action_12781910
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Michael McCandless commented on LUCENE-2093:
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If we don't do this in 3.1, we should at least drop the size of the terms dict
cache -- by rough math, that cache will consume 4 MB on a 20 segment index,
even for a smallish index.
When flex lands, the cache is no longer beneficial for automaton query so it
need not be so large.
> Use query-private scope instead of shared Term->TermInfo cache
> --------------------------------------------------------------
>
> 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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