[horde] Memcache server questions

[Steve Devine]

Quoting "Michael M Slusarz" <slusarz at horde.org>:

> Quoting Steve Devine <sd at msu.edu>:
>
>> Quoting "Kevin Konowalec" <kevin.konowalec at ualberta.ca>:
>>
>>> Unless I've done something really wrong horde will use a whole whack
>>> of servers if you choose - just add all the ip addresses and ports
>>> comma-seperated in the config tool (or conf.php).  Is that NOT the
>>> case???  I don't believe it is since when once machine goes down all
>>> of a sudden x% of the sessions vanish and my phone starts ringing....
>>>
>>> K
>>
>> Yes exactyl its failover in the sense that the whole thing (Horde)  
>> doesn't crash but all the sessions are lost and everyone is logged  
>> out. When they log back in they get the next server in the config.  
>> At least thats my thinking please someone correct me if I am wrong.  
>> :(
>
> Sounds like you are running into the bug that was fixed via this  
> series of patches (these patches are to Horde 3.3):
> http://cvs.horde.org/diff.php/framework/SessionHandler/SessionHandler/memcache.php?r1=1.1.2.8&r2=1.1.2.11
>
> These fixes will be a part of Horde 3.3.1.
>
>>>> Ok thanks for your reply. It seems to me however that no matter what
>>>> you do you are only going to have one memcache server at a time
>>>> servicing the front ends so the load will always fall to one
>>>> individual box. You could divide the system up like so
>>>> Frontend 1~4 => memcache_server-a
>>>> Frontend 5~8 => memcache_server-b
>>>> etc
>>>> But then your sessions will not survive crossing over from frontend
>>>> 1~4 to frontend 5~8.
>
> Note that memcache 3+ (currently marked as beta) adds some  
> additional features such as redundancy that might interest you --  
> see http://pecl.php.net/package/memcache/3.0.0 (note that the  
> 'session_redundancy' option mentioned on that page only applies to  
> the memcache session handler, *NOT* the Horde memcache  
> sessionhandler. These are 2 entirely different session handlers).
>
> michael
>
> -- 
> ___________________________________
> Michael Slusarz [slusarz at horde.org]
>
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Michael
A little clarification please. Are you saying that with the above  
patch an array of front end servers will actively use an array of  
memcache servers and that users on these front ends will be able to  
pass between these front end servers with out losing session data?
/sd


Steve Devine
Email & Storage
Academic Technical Services
Michigan State University