Robert Haas <robertmhaas@gmail.com> writes:
> I think the real trick is figuring out a design that can improve
> concurrency.
I'm far from familiar with the detailed concepts here, but allow me to
comment. I have two open questions:
- is it possible to use a distributed algorithm to produce XIDs, something like Vector Clocks?
Then each backend is able to create a snapshot (well, and XID) on its own, and any backend is still able to compare
itssnapshot to any other snapshot (well, XID)
- is it possible to cache the production of the next snapshots so that generating an XID only means getting the next
ina pre-computed vector?
My guess by reading the emails here is that we need to add some information at snapshot generation time, it's not
justabout getting a 32 bit sequence number.
I'm not sure I'm being that helpful here, but sometime stating the
obviously impossible ideas allows to think about some new design, so I
figured I would still try :)
Regards,
--
Dimitri Fontaine
http://2ndQuadrant.fr PostgreSQL : Expertise, Formation et Support
