lucene-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Michael McCandless (JIRA)" <>
Subject [jira] [Created] (LUCENE-6617) Reduce FST's ram usage
Date Fri, 26 Jun 2015 16:26:04 GMT
Michael McCandless created LUCENE-6617:

             Summary: Reduce FST's ram usage
                 Key: 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

This message was sent by Atlassian JIRA

To unsubscribe, e-mail:
For additional commands, e-mail:

View raw message