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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