[jira] [Commented] (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.

["Mark Curtis (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-6541?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14877459#comment-14877459 ] 

Mark Curtis commented on CASSANDRA-6541:
----------------------------------------

On newer systems with G1 GC is this option ignored? I'm assuming it would be.

> 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
>
>         Attachments: dse_systemlog
>
>
> 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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