[jira] [Updated] (CASSANDRA-9554) Avoid digest mismatch storm on upgrade to 3.0

["Ryan McGuire (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CASSANDRA-9554?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ryan McGuire updated CASSANDRA-9554:
------------------------------------
    Summary: Avoid digest mismatch storm on upgrade to 3.0  (was: Avoid digest mismatch storm on upgade to 3.0)

> Avoid digest mismatch storm on upgrade to 3.0
> ---------------------------------------------
>
>                 Key: CASSANDRA-9554
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-9554
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: Aleksey Yeschenko
>            Assignee: Sylvain Lebresne
>             Fix For: 3.0 beta 2
>
>
> 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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