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https://issues.apache.org/jira/browse/CASSANDRA-14748?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17039026#comment-17039026
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Benedict Elliott Smith commented on CASSANDRA-14748:
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Thanks [~yifanc], that's probably good enough since we've not seen any other
reproductions, and I would expect any issue with the recycling itself to show
up more reliably.
> 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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