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https://issues.apache.org/jira/browse/CASSANDRA-14355?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17623634#comment-17623634
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Benedict Elliott Smith commented on CASSANDRA-14355:
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I would recommend upgrading to the 4.x series. I can say that repair has
received a number of improvements since this ticket was filed, and I would say
it is somewhat likely not to be a problem. However, there was insufficient
information provided to reproduce this bug, so I cannot say for sure whether
any issue you may be experiencing is resolved in a later release.
CASSANDRA-15902 has been resolved since 3.11.9.
> Memory leak
> -----------
>
> Key: CASSANDRA-14355
> URL: https://issues.apache.org/jira/browse/CASSANDRA-14355
> Project: Cassandra
> Issue Type: Bug
> Components: Legacy/Core
> Environment: Debian Jessie, OpenJDK 1.8.0_151
> Reporter: Eric Evans
> Priority: Normal
> Fix For: 3.11.x
>
> 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, LongGC_Dominator-Tree.png, LongGC_Histogram.png,
> LongGC_Problem-Suspect-1_FastThreadLocalThread.png, LongGC_nodetool_info.txt
>
>
> 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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