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https://issues.apache.org/jira/browse/CASSANDRA-14748?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17035011#comment-17035011
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Yifan Cai commented on CASSANDRA-14748:
---------------------------------------
I did a quick check.
Memory leaks was observed in {{netty-all-4.0.39.Final}} as reported [in the
issue|https://github.com/netty/netty/issues/5563]. The cause of the linked
issue is that WeakOrderQueue not being collected fast enough and the fix is
[here|https://github.com/netty/netty/pull/5569]. It looks very likely to the
one described here.
The first commit that has {{netty 4.0.39.Final}} is
[2aa76632d61c60f1bc115289750fd594949ff98f|https://github.com/apache/cassandra/commit/2aa76632d61c60f1bc115289750fd594949ff98f].
I can look deeper into it when get time.
> Recycler$WeakOrderQueue occupies Heap
> -------------------------------------
>
> Key: CASSANDRA-14748
> URL: https://issues.apache.org/jira/browse/CASSANDRA-14748
> Project: Cassandra
> Issue Type: Bug
> Components: Legacy/Core
> Environment: The netty Cassandra using is netty-all-4.0.39.Final.jar
> Reporter: HX
> Priority: Normal
> Fix For: 4.0, 3.11.x, 4.0-rc
>
>
> Heap constantly high on some of the nodes in the cluster, I dump the heap and
> open it through Eclipse Memory Analyzer, looks like Recycler$WeakOrderQueue
> occupies most of the heap.
>
> ||Package||Retained Heap||Retained Heap, %||# Top Dominators||
> |!/jira/icons/i5.gif! <all>|7,078,140,136|100.00%|379,627|
> |io|5,665,035,800|80.04%|13,306|
> |netty|5,665,035,800|80.04%|13,306|
> |util|5,568,107,344|78.67%|2,965|
> |Recycler$WeakOrderQueue|4,950,021,544|69.93%|2,169|
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