[Zope] Re: Zope 2.9 Product Refreshing

[Tres Seaver]

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Dieter Maurer wrote:
>> ...
>> You have that point-of-failure anyway if you are using the RAM-based
>> sessions provided by Zope's core sessioning.  If availability is
>> important to you, then you *need* to be using ZEO and a load balancer,
>> at which point you also have to look at a more scalable / available
>> sessioning solution.
> 
> We are using ZEO, a load balancer and nevertheless have sessions in RAM.
> 
> True, it is less safe than with persistent sessions -- but it
> is also more efficient.
> 
> We do this by ensuring that independent of the load balancer's choice
> a request for a given session goes to that Zope instance that has this
> session.

Then you have the problem the orignal poster was trying to avoid:  you
can't restart an appserver without losing session data for some users.

Externalizing the session storage removes the appserver as a
point-of-failure for user sessions.


Tres.
- --
===================================================================
Tres Seaver          +1 202-558-7113          tseaver at palladion.com
Palladion Software   "Excellence by Design"    http://palladion.com
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