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https://issues.apache.org/jira/browse/SOLR-16500?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17708662#comment-17708662
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ASF subversion and git services commented on SOLR-16500:
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Commit d8d30d8add0c9a94be68821f700fde77c4c73a1c in solr's branch
refs/heads/branch_9x from vinayak hegde
[ https://gitbox.apache.org/repos/asf?p=solr.git;h=d8d30d8add0 ]
SOLR 16642 : upgrade Solr to use Lucene 9.5.0 (#1360)
* SlowAtomicReader should throw UnsupportedOperationException for all
unimplementable methods, namely the nearest-neighbor ones.
* MMapDirectoryFactory no longer supports "unmap" param but can be done
differently.
* SlowCompositeReaderWrapper can no longer cache Terms.
* ComplexPhrase QParser: can't highlight when hl.usePhraseHighlighter=false due
to UnifiedHighlighter change.
* revert SOLR-16500; Java 19 is supported already by Lucene
* Possible perf regression for timeAllowed param; to be addressed separately
Co-authored-by: David Smiley <dsmi...@salesforce.com>
> 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
> Fix For: main (10.0), 9.2
>
> 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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