[Z3-zemantic] Re: big zemantic storage / some changes

[David Pratt]

Hi Tarek.  I am going through the Zemantic product, reading the docs 
and looking at how things are related to each other and trying to put 
this in the context of a zope2 product. My guess is that you are 
running the zope2 code with Zope 2.8 installed to get the other 
relationships to work.

I don't know how far away 2.8 is from working with 2.7 and the standard 
type products so I am also trying to decide what to do about upgrading. 
  My goal would be to have a product that works exclusively for 2.x 
branch since this is where my all my code is presently.  I have two 
servers both on 2.7.5 and a development server I could probably put 2.8 
onto. I have recently gone through the zope3 book and have started to 
come to grips with the fact that it is a significant departure from my 
current code.  I am always willing to embrace change but for what I am 
presently creating it looks like 3 will be out of scope until I really 
have time to start playing with it and understanding it by doing things 
as opposed to just reading about differences.  I am probably in a large 
boat with other people.

Is this practical or should I just load up 2.8 and then have this blend 
of 2 and 3 together?

On Sunday, May 8, 2005, at 08:25 AM, Tarek Ziadé wrote:

>
> Zemantic comes with a really nice backend, called by rdflib 
> (ZODBBackEnd and others in the lib folder). I think you should be able 
> to code your own backend for postgresql and instanciate the 
> triplestore with it, so imho I guess there's no need for a 
> ZemanticExternalRepository.
>
> I am very interesting in this, tell me if you start something

Thanks for the pointers.  I will be attempting this and hoping I can 
get something started shortly.  I think I will play with rdflib by 
itself for a couple days first so I can get a feel for it on a stand 
alone basis.  Can I send Tres's work to you to examine for yourself? He 
has provided a good starting point.  I am hoping we can get this to 
integrate with the library by building on what he has started.  The 
more the merrier if anyone else would be willing to help.  What I could 
really use is just a data set to work with of some files.  Anyone have 
a small store of files that I can play with?  What would be good is 
some sample data for the library example of maybe half a dozen or so 
files.

>
>>
>> I realize also that 2.8 is around the bend but wonder how large the 
>> RAM footprint will be to have Zope2, Five and Zope3 together since 
>> this is the other big issue for me as far as serving since I can't 
>> afford beefy machines.
>
> Zope 3 is not launched through Five, it's just a link to its code so 
> it is usable within a Zope 2 instance.

That's good that I understand this, I was afraid you would have two 
separate Zope instances running that would establish a significant 
footprint and then add products on top - this would mean much more RAM.

Regards,
David