[jira] [Commented] (CASSANDRA-16940) Confusing ProtocolException msg Invalid or unsupported protocol version (4)

["Brandon Williams (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-16940?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17412861#comment-17412861 ] 

Brandon Williams commented on CASSANDRA-16940:
----------------------------------------------

Hmm, nothing really makes sense on the surface here. Version 4 is obviously supported, and I don't see anything in the code here that would care about the peers table.  [~samt] can you look?

> 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.x 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.peer table and once removed, this exception went away.



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