[infinispan-issues] [JBoss JIRA] (ISPN-9320) Automatic hot rod client version selection

[Tristan Tarrant (JIRA)]

    [ https://issues.jboss.org/browse/ISPN-9320?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13599396#comment-13599396 ] 

Tristan Tarrant commented on ISPN-9320:
---------------------------------------

Proposal:
the client should start from the highest version it supports and sends PING requests decrementing the version in the header until it receives a valid PING response from the server.
The server doesn't currently validate the version in the header (it just checks whether it is >=20 to enable the 2.x decoder).

> Automatic hot rod client version selection
> ------------------------------------------
>
>                 Key: ISPN-9320
>                 URL: https://issues.jboss.org/browse/ISPN-9320
>             Project: Infinispan
>          Issue Type: Feature Request
>            Reporter: Tristan Tarrant
>            Assignee: Galder Zamarreño
>             Fix For: 9.4.0.Final
>
>
> A HotRod client should be able to automatic detect the server version and downgrade the protocol version if the server is older.
> Older HotRod clients are still able to connect to newer servers.
> It would be helpful if new API functions are rejected with a clear error message that the function is not available if using an old protocol.



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