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https://issues.apache.org/jira/browse/SOLR-16500?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17625801#comment-17625801
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ASF subversion and git services commented on SOLR-16500:
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Commit dbb085ac57ffc9c4a754b78327491a4116be54f9 in solr's branch
refs/heads/main from Kevin Risden
[ https://gitbox.apache.org/repos/asf?p=solr.git;h=dbb085ac57f ]
SOLR-16500: Added --enable-preview for JDK 19 to enable MemorySegment support
in MMapDirectory (#1142)
> Enable JDK 19 preview options for MMapDirectory V2
> --------------------------------------------------
>
> Key: SOLR-16500
> URL: https://issues.apache.org/jira/browse/SOLR-16500
> Project: Solr
> Issue Type: Task
> Components: scripts and tools
> Reporter: Christine Poerschke
> Assignee: Kevin Risden
> Priority: Major
> Time Spent: 50m
> Remaining Estimate: 0h
>
> [~uschindler] wrote on
> https://issues.apache.org/jira/browse/SOLR-16442?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17620361#comment-17620361
> ticket:
> {quote}
> We should also think of updating the startup scripts to pass
> {{--enable-preview}} to JVM if exactly Java 19 is detected. Elasticsearch and
> Opensearch will / have already done this. Not doing this will print a startup
> warning on Java 19 to Java logging.
> The main reason to pass {{--enable-preview}} to the JVM is to allow
> MMapDirectory V2 to be enabled and memory mapping happening in larger junks
> for less overhead and use of kernel resources (see vm.max-map-count sysctl).
> It also reduces risk of crushing JDK on bad written plugins or bugs with
> reopening IndexSearcher/IndexReader.
> See https://github.com/apache/lucene/pull/912 for more details.
> {quote}
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