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https://issues.apache.org/jira/browse/LUCENE-6105?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael McCandless updated LUCENE-6105:
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Attachment: LUCENE-6105.patch
Patch.
I fixed FST to only cache if the added RAM required is < 20% of the size of the
FST, and if the number of root arcs is >= FIXED_ARRAY_NUM_ARCS_SHALLOW (5),
like array'd arcs.
I also simplified how we assert for "caller illegally changed cached root arc",
and added a test for that.
> Don't create root arc cache for tiny FSTs
> -----------------------------------------
>
> Key: LUCENE-6105
> URL: https://issues.apache.org/jira/browse/LUCENE-6105
> Project: Lucene - Core
> Issue Type: Improvement
> Components: core/FSTs
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Fix For: 4.10, Trunk, 5.x
>
> Attachments: LUCENE-6105.patch
>
>
> The purpose of the root arc cache is to speed up lookups for ASCII terms, but
> it adds high overhead if the FST is already tiny.
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