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From "Benedict (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-6541) Add JVM_OPTS="$JVM_OPTS -XX:+CMSClassUnloadingEnabled" to cassandra-env.sh
Date Thu, 09 Jan 2014 15:46:56 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-6541?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13866721#comment-13866721
] 

Benedict commented on CASSANDRA-6541:
-------------------------------------

FYI, I don't think I asserted this was u45. Only a specific changeset, which appears to have
been in OpenJDK 7u12. It's not possible to see when this was included in Java 6, but could
have been as early as u39 judging from release dates on Wikipedia.

> Add JVM_OPTS="$JVM_OPTS -XX:+CMSClassUnloadingEnabled" to cassandra-env.sh
> --------------------------------------------------------------------------
>
>                 Key: CASSANDRA-6541
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-6541
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Config
>            Reporter: jonathan lacefield
>            Priority: Minor
>
> Newer versions of Oracle's Hotspot JVM , post 6u45, are experiencing issues with GC and
JMX where heap slowly fills up overtime until OOM or a full GC event occurs, specifically
when CMS is leveraged.  Running repair exacerbates this issue.  The configuration added to
the Summary line helps alleviate this behavior and should be included in the C* config files
by default.



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