[jira] [Created] (CASSANDRA-9554) Avoid digest mismatch storm on upgade to 3.0

["Aleksey Yeschenko (JIRA)" <ji...@apache.org>]

Aleksey Yeschenko created CASSANDRA-9554:
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             Summary: Avoid digest mismatch storm on upgade to 3.0
                 Key: CASSANDRA-9554
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-9554
             Project: Cassandra
          Issue Type: Bug
            Reporter: Aleksey Yeschenko
            Assignee: Tyler Hobbs
             Fix For: 3.0 beta 1


CASSANDRA-8099, in {{UnfilteredRowIterators.digest()}}:

{code}
        // TODO: we're not computing digest the same way that old nodes. This
        // means we'll have digest mismatches during upgrade. We should pass the messaging version of
        // the node this is for (which might mean computing the digest last, and won't work
        // for schema (where we announce the version through gossip to everyone))
{code}

In a mixed 2.1(2.2) - 3.0 clusters, we need to calculate both digest at the same time and keep both results, and send the appropriate one, depending on receiving nodes' messaging versions. Do that until {{MessagingService.allNodesAtLeast30()}} is true (this is not unprecedented).



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