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https://issues.apache.org/jira/browse/CASSANDRA-15013?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16768865#comment-16768865
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Sumanth Pasupuleti edited comment on CASSANDRA-15013 at 2/15/19 2:14 AM:
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[~benedict] Your theory seems to be spot on (I have all the evidence supporting
it from the heap dumps and thread dumps now).
* Evidence of requestExecutor queue full (indicated by taskPermit), and all
128 workers busy (indicated by workPermit)
!RequestExecutorQueueFull.png|thumbnail!
* Evidence of blocked epollEventLoopGroup threads (from heap)
!BlockedEpollEventLoopFromHeapDump.png!
* Evidence of blocked epollEventLoopGroup threads (from thread dump)
!BlockedEpollEventLoopFromThreadDump.png!
was (Author: sumanth.pasupuleti):
[~benedict] Your theory seems to be spot on (I have all the evidence supporting
it from the heap dumps and thread dumps now).
* Evidence of requestExecutor queue full (indicated by taskPermit), and all
128 workers busy (indicated by workPermit)
!RequestExecutorQueueFull.png!
* Evidence of blocked epollEventLoopGroup threads (from heap)
!BlockedEpollEventLoopFromHeapDump.png!
* Evidence of blocked epollEventLoopGroup threads (from thread dump)
!BlockedEpollEventLoopFromThreadDump.png!
> Message Flusher queue can grow unbounded, potentially running JVM out of
> memory
> -------------------------------------------------------------------------------
>
> Key: CASSANDRA-15013
> URL: https://issues.apache.org/jira/browse/CASSANDRA-15013
> Project: Cassandra
> Issue Type: Bug
> Components: Messaging/Client
> Reporter: Sumanth Pasupuleti
> Assignee: Sumanth Pasupuleti
> Priority: Major
> Fix For: 4.0, 3.0.x, 3.11.x
>
> Attachments: BlockedEpollEventLoopFromHeapDump.png,
> BlockedEpollEventLoopFromThreadDump.png, RequestExecutorQueueFull.png, heap
> dump showing each ImmediateFlusher taking upto 600MB.png,
> image-2019-02-14-17-59-50-794.png
>
>
> This is a follow-up ticket out of CASSANDRA-14855, to make the Flusher queue
> bounded, since, in the current state, items get added to the queue without
> any checks on queue size, nor with any checks on netty outbound buffer to
> check the isWritable state.
> We are seeing this issue hit our production 3.0 clusters quite often.
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