[jira] [Assigned] (SOLR-16500) pass {{--enable-preview}} to JVM if exactly Java 19

["Kevin Risden (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SOLR-16500?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Kevin Risden reassigned SOLR-16500:
-----------------------------------

    Assignee: Kevin Risden

> pass {{--enable-preview}} to JVM if exactly Java 19
> ---------------------------------------------------
>
>                 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
>
> [~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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