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Posted to issues@solr.apache.org by "David Smiley (Jira)" <ji...@apache.org> on 2026/10/16 23:41:00 UTC

[jira] [Updated] (SOLR-18552) Solr 9: set MMapDirectory.sharedArenaMaxPermits=64

     [ https://issues.apache.org/jira/browse/SOLR-18552?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

David Smiley updated SOLR-18552:
--------------------------------
    Fix Version/s: 9.12

> Solr 9: set MMapDirectory.sharedArenaMaxPermits=64
> --------------------------------------------------
>
>                 Key: SOLR-18552
>                 URL: https://issues.apache.org/jira/browse/SOLR-18552
>             Project: Solr
>          Issue Type: Improvement
>            Reporter: David Smiley
>            Priority: Blocker
>             Fix For: 9.12
>
>
> In Solr 9, I suggest we set org.apache.lucene.store.MMapDirectory.sharedArenaMaxPermits=64 in bin/solr.  On the 9x line, the default is 1024 but current wisdom is that 64 is a better default (true for Lucene 10.x).
> _note: using priority "Blocker" to ensure we don't forget_



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