[HACKERS] Multiple synchronous_standby_names rules - Mailing list pgsql-hackers
Hello,
When working with a production (P) and a DR (D) environment it is often a requirement to be able to protect against data loss when promoting within a site, and also when losing A and promoting a master at D.
The current synchronous_standby_names do not allow this.
In a simple example we could take the following nodes:
Where P1 is replicating to (P2, P3, D1, D2, D3).P1 (current master), P2, P3D1, D2, D3
The closest synchronous_standby_names setting you could get to my use case would be:
This would allow the loss of either site without losing data - however it would not allow promotion within site P from P1 -> (P2 | P3) without the potential for data loss.1 (D1, D2, D3)
What is needed to support this is the ability to configure Px with something like:
1 (P1, P2, P3), 1 (D1, D2, D3)
Would there be any appetite for this - or would it be seen as over complication of the current rules?
Cheers,
James Sewell,
PostgreSQL Team Lead / Solutions Architect
Suite 112, Jones Bay Wharf, 26-32 Pirrama Road, Pyrmont NSW 2009
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