[ https://issues.apache.org/jira/browse/LUCENE-8920?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Chris M. Hostetter reopened LUCENE-8920: ---------------------------------------- TestFstDirectAddressing.testDeDupTails has a 44% failure rate on jenkins boxes since it was added by this commit (so far only on Uwe's machine, but on multiple OSes, and both master and 8.x) > 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: 4.5h > 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? -- This message was sent by Atlassian Jira (v8.3.4#803005) --------------------------------------------------------------------- To unsubscribe, e-mail: issues-unsubscr...@lucene.apache.org For additional commands, e-mail: issues-h...@lucene.apache.org