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https://issues.apache.org/jira/browse/CASSANDRA-13754?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16122390#comment-16122390
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Eric Evans commented on CASSANDRA-13754:
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Cassandra 3.11.0, Netty 4.0.44.Final

> FastThreadLocal leaks memory
> ----------------------------
>
>                 Key: CASSANDRA-13754
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-13754
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>         Environment: OpenJDK 8u141-b15
>            Reporter: Eric Evans
>             Fix For: 3.11.1
>
>
> After a chronic bout of {{OutOfMemoryError}} in our development environment, 
> a heap analysis is showing that more than 10G of our 12G heaps are consumed 
> by the {{threadLocals}} members (instances of {{java.lang.ThreadLocalMap}}) 
> of various {{io.netty.util.concurrent.FastThreadLocalThread}} instances.  
> Reverting 
> [cecbe17|https://git-wip-us.apache.org/repos/asf?p=cassandra.git;a=commit;h=cecbe17e3eafc052acc13950494f7dddf026aa54]
>  fixes the issue.



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