[jira] [Commented] (LUCENE-9286) FST arc.copyOf clones BitTables and this can lead to excessive memory use

["Michael Sokolov (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/LUCENE-9286?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17140502#comment-17140502 ] 

Michael Sokolov commented on LUCENE-9286:
-----------------------------------------

FYI this had a pretty major impact on indexing times in our JP-language clusters. I wonder how we could do a better job of catching such regressions in the future?

> FST arc.copyOf clones BitTables and this can lead to excessive memory use
> -------------------------------------------------------------------------
>
>                 Key: LUCENE-9286
>                 URL: https://issues.apache.org/jira/browse/LUCENE-9286
>             Project: Lucene - Core
>          Issue Type: Bug
>    Affects Versions: 8.5
>            Reporter: Dawid Weiss
>            Assignee: Bruno Roustant
>            Priority: Major
>             Fix For: 8.6
>
>         Attachments: screen-[1].png
>
>          Time Spent: 1h 50m
>  Remaining Estimate: 0h
>
> I see a dramatic increase in the amount of memory required for construction of (arguably large) automata. It currently OOMs with 8GB of memory consumed for bit tables. I am pretty sure this didn't require so much memory before (the automaton is ~50MB after construction).
> Something bad happened in between. Thoughts, [~broustant], [~sokolov]?



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