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https://issues.apache.org/jira/browse/CASSANDRA-16877?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sam Tunnicliffe updated CASSANDRA-16877:
----------------------------------------
          Fix Version/s:     (was: 4.0.x)
                         4.0.1
          Since Version: 4.0-alpha1
    Source Control Link: 
https://github.com/apache/cassandra/commit/b8242730918c2e8edec83aeafeeae8255378125d
             Resolution: Fixed
                 Status: Resolved  (was: Ready to Commit)

Thanks. Agreed about the tests, so committed (with one nit addressed and one 
swerved) to 4.0 in {{b8242730918c2e8edec83aeafeeae8255378125d}} and merged up 
to trunk.

> 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
>            Priority: Normal
>             Fix For: 4.0.1
>
>
> 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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