[jira] [Resolved] (CASSANDRA-6541) New versions of Hotspot create new Class objects on every JMX connection causing the heap to fill up with them if CMSClassUnloadingEnabled isn't set.

["Brandon Williams (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CASSANDRA-6541?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Brandon Williams resolved CASSANDRA-6541.
-----------------------------------------

       Resolution: Fixed
    Fix Version/s: 2.1 beta2
                   2.0.6
                   1.2.16
         Reviewer: Michael Shuler
         Assignee: Brandon Williams

I committed this.

> New versions of Hotspot create new Class objects on every JMX connection causing the heap to fill up with them if CMSClassUnloadingEnabled isn't set.
> -----------------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-6541
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-6541
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Config
>            Reporter: jonathan lacefield
>            Assignee: Brandon Williams
>            Priority: Minor
>             Fix For: 1.2.16, 2.0.6, 2.1 beta2
>
>
> Newer versions of Oracle's Hotspot JVM , post 6u43 (maybe earlier) and 7u25 (maybe earlier), 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.  Adding:
> {noformat}
> JVM_OPTS="$JVM_OPTS -XX:+CMSClassUnloadingEnabled"
> {noformat}
> The the options in cassandra-env.sh alleviates the problem.



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