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https://issues.apache.org/jira/browse/IGNITE-27554?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Aleksandr Chesnokov reassigned IGNITE-27554:
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Assignee: Aleksandr Chesnokov
> Improve discovery handshake diagnostics for incompatible versions
> -----------------------------------------------------------------
>
> Key: IGNITE-27554
> URL: https://issues.apache.org/jira/browse/IGNITE-27554
> Project: Ignite
> Issue Type: Improvement
> Reporter: Aleksandr Chesnokov
> Assignee: Aleksandr Chesnokov
> Priority: Major
>
> h2. Problem
> When a node with a different Ignite version tries to join (e.g. 2.17 to
> 2.18), the discovery handshake may fail before node validation.
> We expect a clear message like:
> "Remote node rejected due to incompatible version for cluster join"
> but it is not printed. Instead, logs show low-level errors like
> StreamCorruptedException, EOFException, or Connection reset, so the real
> reason (version mismatch) is unclear.
> The root cause is that the discovery message serialization format changed:
> after IGNITE_HEADER the new protocol writes an extra leading byte (serMode),
> while older nodes do not write it. As a result, the new node cannot even read
> TcpDiscoveryHandshakeRequest and logs:
> "Received unexpected byte while reading discovery message: -84"
> This message is confusing for support and does not explain what action to
> take.
>
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