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https://issues.apache.org/jira/browse/CASSANDRA-15013?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16768913#comment-16768913
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Jason Brown commented on CASSANDRA-15013:
-----------------------------------------
I agree with upping the max queue depth (or unbounded plus size monitoring) as
well as stop reading from the socket (by setting netty's {{autoRead}} to
false). I'm not, however, convinced about adding yet another configuration
option; adding more configs options only complicates the lives of operators.
How will an operator know how to set it most appropriately to their use
case(s)? We should choose the best solution, *document it*, and go with that as
a built-in behavior. (Note: I'm amenable to throwing the OverloadedException,
as well.)
> 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
>
>
> 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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