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From "Yifan Cai (Jira)" <>
Subject [jira] [Commented] (CASSANDRA-14748) Recycler$WeakOrderQueue occupies Heap
Date Wed, 12 Feb 2020 03:09:00 GMT


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|]. The
cause of the linked issue is that WeakOrderQueue not being collected fast enough and the fix
is [here|]. It looks very likely to the one described

The first commit that has {{netty 4.0.39.Final}} is [2aa76632d61c60f1bc115289750fd594949ff98f|].
I can look deeper into it when get time. 

> Recycler$WeakOrderQueue occupies Heap
> -------------------------------------
>                 Key: CASSANDRA-14748
>                 URL:
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Legacy/Core
>         Environment: The netty Cassandra using is netty-all-4.0.39.Final.jar
>            Reporter: HX
>            Priority: Normal
>             Fix For: 4.0, 3.11.x, 4.0-rc
> Heap constantly high on some of the nodes in the cluster, I dump the heap and open it
through Eclipse Memory Analyzer, looks like Recycler$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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