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https://issues.apache.org/jira/browse/CASSANDRA-13754?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16150609#comment-16150609
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Jeremiah Jordan commented on CASSANDRA-13754:
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+1 for just
https://github.com/apache/cassandra/commit/2cafd0b6b4bbc5a6ec5726d47d0093bdac3af19c
to fix this and splitting out the other changes to a new ticket.
> FastThreadLocal leaks memory
> ----------------------------
>
> Key: CASSANDRA-13754
> URL: https://issues.apache.org/jira/browse/CASSANDRA-13754
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Environment: Cassandra 3.11.0, Netty 4.0.44.Final, OpenJDK 8u141-b15
> Reporter: Eric Evans
> Assignee: Robert Stupp
> 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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