Preparation for the Cyrus 2.5 release

[Bron Gondwana]

On Thu, Oct 23, 2014, at 09:41 AM, ktm at rice.edu wrote:
> Hi Bron,
> 
> I do not know if it is still in the running, but having a way to upgrade from
> 2.3.x to 2.5 without the tremendous I/O storm caused by the mailbox format
> conversions which will basically shutdown the mail servers, would be great.
> Originally you had thought that 2.5 would be able to replicate to a 2.3
> cyrus which would allow the replica to be upgraded first, then failover to
> it and upgrade the other 2.3. This keeps the upgrade I/O on the backup system
> where it can be managed. There were also discussions about having it support
> the older mailbox formats so the upgrade to the new format could be managed
> and not required.
> 
> Regards,
> Ken (still stuck on 2.3)

Yeah, that's really horrible, isn't it.

I have a few stabs at that sitting on branches, but nothing solid.  It might be that 2.5 has to release without it, mostly as an upgrade path for people already on 2.4 (that upgrade is cheap).

I haven't forgotten about you guys, it's just a hard problem[tm].

Bron.


-- 
  Bron Gondwana
  brong at fastmail.fm