Not possible to replicate from 2.3.7 to 2.3.16?

[Raphael Jaffey]

Jason L Tibbitts III wrote:
> [Forgot to send this to the list; sorry.
> 
>>>>>> "BG" == Bron Gondwana <brong at fastmail.fm> writes:
> 
> BG> No, sorry.
> 
> I figured as much; I backed off to 2.3.7 on the new machine so that I
> could get a good replica.
> 
> BG> Replication across versions is trick at the best of times, and
> BG> you're talking about versions 3 and a half years apart!
> 
> I had guessed, though perhaps I had hoped that something would simply
> tell me that instead of giving odd errors that made me think that I had
> misconfigured something.  But I think I have my plan of attack readied.
> 
> BG> Unfortunately, your only real option is to upgrade to 2.3.16 on both
> BG> at roughly the same time.
> 
> Actually my plan is to simply abandon the old, failing master (leaving
> it with the current content in case things blow up), upgrade the replica
> to 2.3.16, make it the master and set up yet another machine as a
> replica.
> 
> BG> The upgrade itself should go seamlessly.  Because of the mailbox
> BG> format change, you will get an IO hit as each mailbox open causes a
> BG> full index file rewrite to upgrade it to the new format!
> 
> Not a big deal, though I wonder if there's any way I can force this to
> happen all at once in the middle of the night instead of when some user
> happens to open their multi-gigabyte inbox.  The new machine is
> seriously over-specified for the task at hand so I don't think the extra
> IO will be a problem, but it would still be nice to do it all at once.
> 
> BG> This also means you can't downgrade again without doing a full
> BG> reconstruct of every mailbox.
> 
> I hope to not need to do so, but in case I do, that's just
>   reconstruct -r
> on everything under user, right?  I guess it's a credit to the software
> that I've never really have to mess with the recovery tools in the years
> I've been using it.

su - -c "/usr/lib/cyrus-imapd/reconstruct -r -s -k user.*" cyrus

> 
>  - J<
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