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https://issues.apache.org/jira/browse/CASSANDRA-15013?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16874183#comment-16874183
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Sumanth Pasupuleti commented on CASSANDRA-15013:
------------------------------------------------
Thanks for catching the {{channelInactive}} case. lgtm.
One thing remaining I suppose, is to revisit the defaults
[https://github.com/apache/cassandra/commit/98126f5d887228f5e88eca66f007873b52a0aacf#diff-b66584c9ce7b64019b5db5a531deeda1R173]
{code:java}
// TODO: Revisit limit
public volatile long native_transport_max_concurrent_requests_in_bytes_per_ip =
3000000000L;
public volatile long native_transport_max_concurrent_requests_in_bytes =
5000000000L;{code}
> 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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