[Zope-dev] Re: More resilient indexes
roche at upfrontsystems.co.za
Wed Sep 19 15:20:28 EDT 2007
On Tue, 2007-09-18 at 20:01 +0200, Dieter Maurer wrote:
> Roché Compaan wrote at 2007-9-18 08:55 +0200:
> > ...
> >Sorry if I was unclear but what I'm really asking is if it is possible
> >to improve the conflict handling of the current indexes that we have in
> >Zope. I am also asking if concurrent indexing in the ZODB is a realistic
> I have implemented "Conflict Reduced Indexes".
> They essentially work as follows:
> Standard indexes use for efficiency reasons a complex
> dance with a quite high conflict potential:
> The document list for a term can have 3 implementation
> missing, represented as an integer, represented as an IITreeSet.
> Whenever the implentation type changes, a conflict will occur
> when a concurrent request accesses the same document list.
> The conflict reduced indexes use only 2 implementation types:
> missing and IITreeSet and once, the list used an IITreeSet,
> it remains this way.
> This can leverage the conflict resolution build in "OOBTree"
> and "IITreeSet" quite well.
> Nevertheless, it turned out that these separate indexes were
> not worth the efford (meanwhile, they have been replaced by
Thanks for your feedback. I refactored things a little bit so that I
don't require immediate indexing which makes QueueCatalog a good
Upfront Systems http://www.upfrontsystems.co.za
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