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From "Robert Stupp (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (CASSANDRA-13754) FastThreadLocal leaks memory
Date Thu, 31 Aug 2017 14:08:00 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-13754?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16149023#comment-16149023
] 

Robert Stupp edited comment on CASSANDRA-13754 at 8/31/17 2:07 PM:
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[~markusdlugi] do you have a heap dump for me or references to what's actually in these {{FastThreadLocal}}
s or which FTLs actually cause this? I suspect these are FTLs created in non-static fields,
which probably need a different handling.

Calling {{FastThreadLocal.removeAll()}} after every iteration in {{SEPWorker}} is not a good
solution, because that would effectively kill the benefit of all static FTLs.


was (Author: snazy):
[~markusdlugi] do you have a heap dump for me or references to what's actually in these {{FastThreadLocal}}
s or which FTLs actually cause this? I suspect these are FTLs created in non-static fields,
which probably need a different handling.

> 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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