[Erp5-dev] upgrading issue

[Mikolaj Antoszkiewicz]

Jérome Perrin wrote:
> Le lundi 05 mai 2008 à 13:40 +0200, Mikolaj Antoszkiewicz a écrit :
>> Hello, again
>>
>> The solution that is now working, was to change configuration in the 
>> SelectionTool from Persistent Mapping support to Memcached Tool.
>>
>> With Persistent Mapping it all went to hell, when trying to get ghost 
>> object, unpickler found a string instead of a class.
> 
> I've also had this problem long ago, and escaped with the same
> workaround. Have you updated zope version in the same time ?
> Maybe this can be related to pickles that were contained in selection
> (form_pickle), but as far as I see we never had special handling for
> this.

Very probable, since unpickler found a string 'ERP5 Form' instead of the 
class instance.

> 
>> The question that arises is:
>>
>> What should be supported: Persistent Mapping or Memcached Tool by the 
>> Selection Tool?
>> My guess is that it should be Memcached Tool, but by default Persistent 
>> Mapping is set in Selection Tool configuration...
> 
> Persistent Mapping is the default because it does not require any
> configuration. Memcached version is a must for big projects.

What kind of configuration Memcached version requires?

Mikolaj