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Jon Haddad commented on CASSANDRA-10619:
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While I can't say for sure, my assumption is each nodes version would have to
be sent as part of gossip.
Currently if you try to stream between major versions it just craps out and
bites people hard, so it's not like we're adding some ridiculous restriction to
streaming. It doesn't work - so I'd rather prevent users from making a tragic
mistake than allow them to keep screwing up.
If you had 30 servers per rack x 30 racks, you should be able to upgrade 1 rack
at a time. That shouldn't take weeks, maybe a couple days? Running a mixed
cluster for any significant length of time is just asking for trouble.
> disallow streaming operations while upgrading
> ---------------------------------------------
>
> Key: CASSANDRA-10619
> URL: https://issues.apache.org/jira/browse/CASSANDRA-10619
> Project: Cassandra
> Issue Type: Improvement
> Reporter: Jon Haddad
>
> Cassandra should prevent users from doing streaming operations in the middle
> of a cluster upgrade.
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