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https://issues.apache.org/jira/browse/LUCENE-8920?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16975067#comment-16975067
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ASF subversion and git services commented on LUCENE-8920:
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Commit 5a4600e6d3c0a8ff116f0787ff3636670e95dd7b in lucene-solr's branch
refs/heads/branch_8x from Bruno Roustant
[ https://gitbox.apache.org/repos/asf?p=lucene-solr.git;h=5a4600e ]
LUCENE-8920: Fix flapping TestFstDirectAddressing.testDeDupTails (#1012)
> Reduce size of FSTs due to use of direct-addressing encoding
> -------------------------------------------------------------
>
> Key: LUCENE-8920
> URL: https://issues.apache.org/jira/browse/LUCENE-8920
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Michael Sokolov
> Priority: Minor
> Fix For: 8.4
>
> Attachments: TestTermsDictRamBytesUsed.java
>
> Time Spent: 5h 10m
> Remaining Estimate: 0h
>
> Some data can lead to worst-case ~4x RAM usage due to this optimization.
> Several ideas were suggested to combat this on the mailing list:
> bq. I think we can improve thesituation here by tracking, per-FST instance,
> the size increase we're seeing while building (or perhaps do a preliminary
> pass before building) in order to decide whether to apply the encoding.
> bq. we could also make the encoding a bit more efficient. For instance I
> noticed that arc metadata is pretty large in some cases (in the 10-20 bytes)
> which make gaps very costly. Associating each label with a dense id and
> having an intermediate lookup, ie. lookup label -> id and then id->arc offset
> instead of doing label->arc directly could save a lot of space in some cases?
> Also it seems that we are repeating the label in the arc metadata when
> array-with-gaps is used, even though it shouldn't be necessary since the
> label is implicit from the address?
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