[jira] [Created] (LUCENE-6617) Reduce FST's ram usage

["Michael McCandless (JIRA)" <ji...@apache.org>]

Michael McCandless created LUCENE-6617:
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             Summary: 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


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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