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https://issues.apache.org/jira/browse/CASSANDRA-16518?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17499639#comment-17499639
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Brandon Williams commented on CASSANDRA-16518:
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I think the real issue here is that we've allowed a null release_version that 
never gets resolved, and this patch works around that by ignoring unset 
versions.  That said, we've released versions that do this, so working around 
it seems like the only solution.  Can we add a test for this?

> Node restart during joining sets protocol version to V3
> -------------------------------------------------------
>
>                 Key: CASSANDRA-16518
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-16518
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Messaging/Client
>            Reporter: Joseph Clay
>            Assignee: Stefan Miklosovic
>            Priority: Normal
>             Fix For: 3.11.x
>
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> While joining nodes to a cluster, an old node crashed. The old node was 
> recovered however clients (datastax java) refused to connect to it.
> The driver error:
> {noformat}
> Detected added or restarted Cassandra host /<ip>:<port> but ignoring it since 
> it does not support the version V4 of the native protocol which is currently 
> in use.{noformat}
> In the recovered node cassandra logs:
> {noformat}
> INFO  o.a.c.transport.ConfiguredLimit Detected peers which do not fully 
> support protocol V4. Capping max negotiable version to V3{noformat}
> I confirmed that ALL the nodes in the cluster, joining or otherwise, were 
> apache-cassandra-3.11.6 so that error message was rather confusing.
>  Eventually after digging through the code we got to the bottom of the issue:
> https://issues.apache.org/jira/browse/CASSANDRA-15193 adds a check for node 
> version, which reverts the protocol version to V3 if any peer fails the 
> version check. Joining nodes have NULL for their version in the peers table, 
> which fails the version check.
>  



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