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  1. Solr
  2. SOLR-16500

Enable JDK 19 preview options for MMapDirectory V2

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    • Task
    • Status: Closed
    • Major
    • Resolution: Fixed
    • None
    • main (10.0), 9.2
    • scripts and tools
    • None

    Description

      Uwe Schindler wrote on https://issues.apache.org/jira/browse/SOLR-16442?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17620361#comment-17620361 ticket:

      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.

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            krisden Kevin Risden
            cpoerschke Christine Poerschke
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