Re: Replication Node Identifiers and crashsafe Apply Progress

On 11/21/13, 6:15 AM, Andres Freund wrote:
> On 2013-11-20 15:05:17 -0500, Robert Haas wrote:
>>> That's what I had suggested to some people originally and the response
>>> was, well, somewhat unenthusiastic. It's not that easy to assign them in
>>> a meaningful automated manner. How do you automatically assign a pg
>>> cluster an id?
>>
>> /dev/urandom
> 
> Well yes. But then you need a way to store and change that random id for
> each cluster.

You can use a v3 UUID, which is globally reproducible.