Re: [Gnu-arch-users] [BUG] can get duplicate explicit IDs if adding fast enough

[Aaron Bentley]

Jonathan Geisler wrote:
> On Tue, May 18, 2004 at 05:03:52PM -0400, Aaron Bentley wrote:
> > There's a very simple way to get a guaranteed unique ID; use a sequence 
> > number.  This would require an extra file (with locking protocol), or 
> > else a tree-inventory for every add.
>
>
> And to truly work across branches, this would require the locking
> protocol to take into account adds being made in any location and
> therefore some sort of centralized server to pass out these unique
> IDs.

I think you're over-stating.  If sequence numbers were used, they could 
be uniqe per-machine.  If the timestamp and id were retained, the 
combination of time, sequence and id would be unique across branches. 
(Unless two people with the same ID add files in two branches at the 
same exact time!)

> It seems that uuidgen is the best solution due to the lower
> chances of an ID collision.

I agree with that, though.

Aaron

--
Aaron Bentley
Director of Technology
Panometrics, Inc.