[ZODB-Dev] Unique Object ID

[Casey Duncan]

On Tuesday 10 June 2003 08:01 am, Christian Reis wrote:
> On Mon, Jun 09, 2003 at 04:26:36PM -0400, Casey Duncan wrote:
> > _v_nextuid defaults to None using a class attribute. For a single thread, 
this 
> > will tend to cluster uids sequencially so they don't touch as many 
buckets.  
> > Since _v_ attrs are thread specific, each thread willbe working from a 
> > different base uid.
> 
> As Jeremy pointed out, doesn't this raise the chance of getting
> unhandled ConflictErrors in the BTree we store the objects in?

No, because each thread will have a different _v_nextuid. It would be 
extremely unlikely for them to collide.

A totally random generation of uids would probably cause more conflicts 
because it would tend to touch more btree buckets when multiple entries were 
made in a single transaction.

-Casey