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https://issues.apache.org/jira/browse/CASSANDRA-11551?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16013903#comment-16013903
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Nick Hryhoriev commented on CASSANDRA-11551:
--------------------------------------------
Just want mention that in 3.9 it's still exist.
> Incorrect counting of pending messages in OutboundTcpConnection
> ---------------------------------------------------------------
>
> Key: CASSANDRA-11551
> URL: https://issues.apache.org/jira/browse/CASSANDRA-11551
> Project: Cassandra
> Issue Type: Bug
> Reporter: Robert Stupp
> Priority: Minor
> Fix For: 2.2.x
>
>
> Somehow {{OutboundTcpConnection.getPendingMessages()}} seems to return a
> wrong number.
> {code}
> nodetool netstats
> Mode: NORMAL
> Not sending any streams.
> Read Repair Statistics:
> Attempted: 1655
> Mismatch (Blocking): 0
> Mismatch (Background): 2
> Pool Name Active Pending Completed
> Large messages n/a 5 0
> Small messages n/a 0 31534100
> Gossip messages n/a 0 520393
> {code}
> Inspection of the heap dump of that node unveiled that all instances of
> {{OutboundTcpConnection.backlog}} are empty but {{currentMsgBufferCount}} is
> {{1}} for 5 instances of {{OutboundTcpConnection}}.
> Maybe the cause is in {{OutboundTcpConnection.run()}} where
> {{drainedMessages.size()}} is called twice but assumed that these are equal.
> /cc [~aweisberg]
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