Re: Benefits of CPSZAsyncIndexationManager

On Jan 15, 2009, at 4:22 PM, Santi Camps wrote:

> Hi all,

Hi, not much really hepful to say on that topic

>
>
> I've been seen the product CPSZAsyncIndexationManager but I'm asking  
> by the benefits of use it.   For example, if I add an object to the  
> portal, I want it to be indexed before response to the user, so the  
> response could include this new object in any portlet build using  
> the portal_catalog.

Yes that's right, and that's why I'm no big fan of asynchronous  
indexation: it breaks the transactional contract.

Still, it's possible to adopt a mixed approach as it's been done in  
Nuxeo's Search Service*: minimal, fast, sync indexation for listings  
and async for full texts and fields that aren't needed for listings.
I'm no specialist of CPSZAsyncIndexationManager, but I'd really doubt  
that it has such possibilites.
Besides, I've heard that it's really hard to tweak zasync processes to  
really work under stressful conditions (typically you would'nt bother  
with async if you hadn't too much load for sync operation). Never done  
it myself, though.

> So, the benefit of use this product with zasync is to serialize all  
> reindexes, avoiding ConflictError between threads ?

Yes, the main issue with long indexing times is to avoid conflicts, be  
it between different indexing tasks** or simply because of too long  
transaction times overall.

* at least while I was still working on it, situation might be  
different now.
**ZCatalog is based on BTrees, and BTrees can have more conflicts than  
you'd think. I've heard that the situation gets better on recent Zope  
versions, but CPS is still based on Zope 2.9 at this point.

> Or it has other purposes ?
>
> Thanks in advance
> -- 
> Santi Camps (Earcon S.L.)
> http://www.earcon.com
> http://www.kmkey.com
>
> _______________________________________________
> cps-devel mailing list
> http://lists.nuxeo.com/mailman/listinfo/cps-devel

--
Georges Racinet
Zope/CPS/Plone expertise & assistance





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