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https://issues.apache.org/jira/browse/LUCENE-6105?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14241271#comment-14241271
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Michael McCandless commented on LUCENE-6105:
--------------------------------------------
Thanks Rob.
I'll remove the 4.10.x fix version for now ... I agree there is some risk. We
can let Jenkins chew on it in trunk/5.x, and see if there are any performance
issues in the nightly performance benchmarks
(http://people.apache.org/~mikemccand/lucenebench/).
I do think it's a bug though: an FST that would otherwise take ~200 bytes can
take ~4 KB instead, because of this cache.
> 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: Bug
> Components: core/FSTs
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Fix For: 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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