[jira] [Created] (CASSANDRA-16877) High priority internode messages which exceed the large message threshold are dropped

["Sam Tunnicliffe (Jira)" <ji...@apache.org>]

Sam Tunnicliffe created CASSANDRA-16877:
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             Summary: High priority internode messages which exceed the large message threshold are dropped
                 Key: CASSANDRA-16877
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-16877
             Project: Cassandra
          Issue Type: Bug
          Components: Cluster/Gossip
            Reporter: Sam Tunnicliffe
            Assignee: Sam Tunnicliffe


Currently, there is an assumption that internode messages whose verb has priority P0 will always fit within a single messaging frame. While this is usually the case, on occasion it is possible that this assumption does not hold. One example is gossip messages during the startup shadow round, where in very large clusters the digest ack can contain all states for every peer. In this scenario, the respondent fails to send the ack which may lead to the shadow round and, ultimately, the startup failing.
 
We could tweak the shadow round acks to minimise the message size, but a more robust solution would be to permit high priority messages to be sent on the large messages connection when necessary.



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