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https://issues.apache.org/jira/browse/CASSANDRA-16940?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17537251#comment-17537251
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Jai Bheemsen Rao Dhanwada commented on CASSANDRA-16940:
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thanks [~brandon.williams] I checked all the comments and it looks like this
entry with null version happens if Cassandra nodes are running with [separate
IP addresses for listen and broadcast
address.|https://issues.apache.org/jira/browse/CASSANDRA-16518?focusedCommentId=17425372&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-17425372].
In my case I am running my cassandra cluster in Kubernetes and I am only
setting listen_address as the Pod IP address and broadcast address is same as
listen. Not sure if I am running into
[CASSANDRA-16518|https://issues.apache.org/jira/browse/CASSANDRA-16518].
> Confusing ProtocolException msg Invalid or unsupported protocol version (4)
> ---------------------------------------------------------------------------
>
> Key: CASSANDRA-16940
> URL: https://issues.apache.org/jira/browse/CASSANDRA-16940
> Project: Cassandra
> Issue Type: Bug
> Components: Messaging/Client
> Reporter: Brad Schoening
> Priority: Normal
>
> The following warning was seen frequently after upgrading from 3.0.15 to
> 3.11.11 in the cassandra.log:
> {noformat}
> ProtocolException: Invalid or unsupported protocol version (4); supported
> versions are (3/v3, 4/v4, 5/v5-beta){noformat}
> It is at best unclear, or maybe a bug in the code throwing this exception
> stating version '4' not supported but 4/v4 is.
> from org/apache/cassandra/transport/ProtocolVersion.java
> public static String invalidVersionMessage(int version)
> { return String.format("Invalid or unsupported protocol version (%d);
> supported versions are (%s)", version, String.join(", ",
> ProtocolVersion.supportedVersions())); }
> We later found invalid IP addresses in the system.peers table and once
> removed, this exception went away.
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