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From ayyagarikiran <ayyagariki...@gmail.com>
Subject Re: [Schema Refactoring] Serious side effect...
Date Mon, 23 Nov 2009 10:36:43 GMT

the approach of 'no-swapping' sounds good to me

thanks for all the great work I now understand what a pain this schema refactoring is

Kiran Ayyagari

Emmanuel Lecharny wrote:
> Hi,
> 
> when we modify the schema, for instance by adding a new AT, in order not 
> to break the current schema, we apply the modification to a cloned 
> Registries. So far, so good. And if the new registries is ok with the 
> newly added SchemaObject, we swap the registries.
> 
> Now, this create a dull issue : all the ServerEntry instances still 
> point to the previous registries, and as we clean the previous 
> registries to avoid memory leaks, all those instances now point to non 
> existing SchemaObjects (more specifically, each instance has attributes 
> which contain a reference to the AttributeType schemaObject they are 
> associated with) !
> 
> Question : how can we avoid this problem ? My idea is to apply the 
> modification to the initial registries once it has been proven that the 
> registries alteration leave the Regsitries consistent. We will just 
> clean the cloned registries, and don't swap anymore.
> 
> Does it sound good to you, or do you have any better idea ?
> 

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