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https://issues.apache.org/jira/browse/CASSANDRA-15013?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16838232#comment-16838232
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Sumanth Pasupuleti commented on CASSANDRA-15013:
------------------------------------------------
Thanks for the feedback [~benedict]. I have incorporated it in the branch
https://github.com/sumanth-pasupuleti/cassandra/commits/15013_trunk_2
However, with this change, we will lose the ability to change the
endpoint/global limits on a node on the fly, without restarting C* process.
Added forceAllocate method to ResourceLimits, to accommodate backpressure
scenario.
A few DTest failures, seemingly from race conditions on allocate/release.
Working on figuring out where the race is coming from.
Dtest results:
https://circleci.com/gh/sumanth-pasupuleti/cassandra/369#tests
https://circleci.com/gh/sumanth-pasupuleti/cassandra/368#tests
> 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: Normal
> Labels: pull-request-available
> 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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