Re: RE: [Plone-developers] Plone 1.1 - TODO

On Mon, 09 Jun 2003 11:06:26 -0700, 
<sean.upton-lttx/tDbukJF6kxbq+BtvQ@xxxxxxxxxxxxxxxx> wrote:

> The current system uses time and the id; with the exception of index_html 
> as
> an id, the chance of a collision is pretty low in a well-designed CMS
> deployment.

Creating a UID on a pattern than occurs 86400 times a day isn't my idea of 
a low collision possibility. In some cases the probability of a collision 
is exactly 1. (Creating objects from a scheduled task. Ouch ouch ouch.)

Doesn't have to be index_html either. Any ID in common use is going to 
cause problems. My favourite is portrait.jpg which all 450000 users in my 
test system have. Oops. ;-)

> I think one naming scheme could likely involve the thread-id of the 
> creating
> thread.  When the UID is created, the id of the thread that creates it 
> gets
> the first few part of the UID string, followed by a dash, followed by the
> results from time.time() - which would prevent the possibility of UID 
> name
> collision between multiple threads, and also increase thread/bucket 
> affinity
> in a refs BTree, at least in the creation of objects (which is likely
> biggest potential source of conflict-errors).

That gets a big resounding cheer from me, and would clear up the only real 
thing that prevents references from being of any use to me at the moment.

--
Seb Potter
Lead Developer
Getfrank Limited



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