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https://issues.apache.org/jira/browse/CASSANDRA-14355?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16426397#comment-16426397
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Eric Evans commented on CASSANDRA-14355:
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Our production cluster is on 3.11.0 and is running fine, yes. This staging
environment was first setup on 3.11.0 where these OOMs started, and has since
been upgraded to 3.11.2. Both versions OOM (regularly, on about 1.5 hour
intervals, in fact).
> Memory leak
> -----------
>
> Key: CASSANDRA-14355
> URL: https://issues.apache.org/jira/browse/CASSANDRA-14355
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Environment: Debian Jessie, OpenJDK 1.8.0_151
> Reporter: Eric Evans
> Priority: Major
> Fix For: 3.11.3
>
> Attachments: 01_Screenshot from 2018-04-04 14-24-00.png,
> 02_Screenshot from 2018-04-04 14-28-33.png, 03_Screenshot from 2018-04-04
> 14-24-50.png
>
>
> We're seeing regular, frequent {{OutOfMemoryError}} exceptions. Similar to
> CASSANDRA-13754, an analysis of the heap dumps shows the heap consumed by the
> {{threadLocals}} member of the instances of
> {{io.netty.util.concurrent.FastThreadLocalThread}}.
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