Re: Session clustering between tomcat versions.

On 05/08/2026 13:39, Stephen Booth wrote:
> Hypothetically, is the session clustering protocol the same between 
> different major tomcat versions.
> 
> I've never had any problem doing a rolling update for minor versions 
> without dropping any sessions (we also use parallel deploy).
> 
> To be perfectly honest I'm happy doing a full restart and just dropping 
> sessions when doing a major version update but I do wonder if it would 
> work if I tried a rolling update.

Hmm. It should work. But it isn't something that gets tested very much 
(if at all). I'd test it first.

If you are using the EncryptInterceptor it might not - depending on 
exactly which versions you are migrating to/from because of recent(ish) 
changes in the wire format for encrypted data.

Mark