GitHub user fabien-dlb added a comment to the discussion: Client-Server 
compatibility matrix

>From @david-streamlio message [here in 
>#19552](https://github.com/apache/pulsar/discussions/19552#discussioncomment-5012342),
> then it seems we should not have to care about geo replication between 2.7.x 
>and 2.11.x during a rolling update.

Would it be the same inside a given cluster for everything (zookeeper, 
bookeeper) while performing that rolling update?

And what about clients: can clients running 2.7.x work perfectly with a cluster 
migrated to 2.11.x? Or would the opposite be better, have clients updated to 
2.11.x while still on 2.7.x and then update the backend services to 2.11.x?

GitHub link: 
https://github.com/apache/pulsar/discussions/20109#discussioncomment-6062362

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