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https://issues.apache.org/jira/browse/LUCENE-6617?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14603151#comment-14603151
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Robert Muir commented on LUCENE-6617:
-------------------------------------
This seems good to me.
> Reduce FST's ram usage
> ----------------------
>
> Key: LUCENE-6617
> URL: https://issues.apache.org/jira/browse/LUCENE-6617
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Fix For: 5.3, Trunk
>
> Attachments: LUCENE-6617.patch
>
>
> Spinoff from LUCENE-6199, pulling out just the FST RAM reduction changes.
> The FST data structure tries to be a RAM efficient representation of a sorted
> map, but there are a few things I think we can do to trim it even more:
> * Don't store arc and node count: this is available from the Builder if you
> really want to do something with it.
> * Don't use the "paged" byte store unless the FST is huge; just use a
> single byte[]
> * Some members like lastFrozenNode, reusedBytesPerArc, allowArrayArcs are
> only used during building, so we should move them to the Builder
> * We don't need to cache NO_OUTPUT: we can ask the Outputs impl for it
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