On 22 Nov 2012, at 08:46, Tomas Sykora wrote:

Hi guys,

is this topic related?
https://community.jboss.org/wiki/RollingUpgradesInInfinispan

Indirectly: in the case of rolling upgrades existing clients still need to be able to operate with new versions, which require an API compatibility.

I'd assume that *whole* cluster will be upgraded to some higher version. Running cluster with different versions seems risky to me too. This ^^ process should be smooth but I don't know how about changes in API.

I'm very interested in this topic - that's the reason why I jumped in to your discussion.

Very interesting topic indeed. 5.2 brings support for rolling upgrades, but the way we do it is not by allowing 5.1 and 5.2 nodes to coexist in the same cluster, but by creating a new 5.2 cluster and migrating both state and clients from the 5.1 clients to it.

Thank you!

----- Original Message -----
From: "Thomas Fromm" <tf@tfromm.com>
To: "infinispan -Dev List" <infinispan-dev@lists.jboss.org>
Sent: Thursday, November 22, 2012 8:23:22 AM
Subject: Re: [infinispan-dev] public API/what should be preserve between minor releases?

On 22.11.2012 04:11, Navin Surtani wrote:
As you see, IMHO such API changes do not have much effect in normal
situations. I can imagine only problems, when the changed methods are
used within dist exec calls and there are (during update or whatever)
different versions of infinispan inside the cluster.
Does this really happen? I'm asking purely out of ignorance but on instinct I think that running different versions on the cluster is probably a bit risky?

Thats the plan for our own software. Customer can update the nodes one
by one, of course only for patch releases.
I'd expect (or at least hope) that this will be also possible with
infinispan in case of critical bug was fixed or smth.
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