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https://issues.apache.org/jira/browse/CASSANDRA-18968?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17784224#comment-17784224
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Brandon Williams commented on CASSANDRA-18968:
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I think it would make a lot of sense to run the upgrade tests here.
> StartupClusterConnectivityChecker fails on upgrade from 3.X
> -----------------------------------------------------------
>
> Key: CASSANDRA-18968
> URL: https://issues.apache.org/jira/browse/CASSANDRA-18968
> Project: Cassandra
> Issue Type: Bug
> Components: Local/Startup and Shutdown
> Reporter: Paulo Motta
> Assignee: Isaac Reath
> Priority: Normal
> Labels: lhf
> Fix For: 4.0.x, 4.1.x
>
> Time Spent: 1h 50m
> Remaining Estimate: 0h
>
> Starting up a new 4.X node on a 3.x cluster throws the following warning:
> {noformat}
> WARN [main] 2023-10-27 15:58:22,234
> StartupClusterConnectivityChecker.java:183 - Timed out after 10002
> milliseconds, was waiting for remaining peers to connect: {dc1=[X.Y.Z.W,
> A.B.C.D]}
> {noformat}
> I think this is because the PING messages used by the startup check are not
> available on 3.X.
> To provide a smoother upgrade experience we should probably disable this
> check on a mixed version clusters, or skip peers on versions < 4.x when doing
> the connectivity check.
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