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https://issues.apache.org/jira/browse/CASSANDRA-13754?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16164860#comment-16164860
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Eric Evans commented on CASSANDRA-13754:
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{quote}
I think it might still be the same issue. The threads you mentioned are all
created by the SEPWorker as well, as you can also see in your screenshot where
your FastThreadLocalThread has a reference to an instance of that class. Now
I'm not sure whether the actual content of your ThreadLocalMap s is the same as
in my heap dump - in my case, the maps mostly held instances of BTree$Builder ,
which then had references to many byte[] arrays. Maybe you can check if this is
the case for you as well?
{quote}
There are no instances of {{BTree}} here, (see new screenshot attached).
{quote}
Other than that, you could also try and see if the patches created by Robert
Stupp alleviate your issue.
{quote}
Do you mean
[bed7fa5|https://github.com/apache/cassandra/commit/bed7fa5ef8492d1ff3852cf299622a5ad4e0b621]?
I haven't applied that, no, but it doesn't look like I'm leaking anything
{{BTree}} so I don't think that would help.
> BTree.Builder memory leak
> -------------------------
>
> 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
>
> Attachments: Screenshot from 2017-09-11 16-54-43.png, Screenshot from
> 2017-09-13 10-39-58.png
>
>
> 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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