Andres Freund <andres@2ndquadrant.com> writes:
> On Monday, June 18, 2012 11:51:27 PM Daniel Farina wrote:
>> What's the cost of going a lot higher? Because if one makes enough
>> numerical space available, one can assign node identities without a
>> coordinator, a massive decrease in complexity.
> It would increase the size of every wal record. We just have 16bit left there
> by chance...
"Every WAL record"? Why in heck would you attach it to every record?
Surely putting it in WAL page headers would be sufficient. We could
easily afford to burn a page switch (if not a whole segment switch)
when changing masters.
I'm against the idea of eating any spare space we have in WAL record
headers for this purpose, anyway; there are likely to be more pressing
needs in future.
regards, tom lane