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