Multiple synchronous_standby_names rules

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:

P1 (current master), P2, P3
D1, D2, D3

Where P1 is replicating to (P2, P3, D1, D2, D3).

The closest synchronous_standby_names setting you could get to my use case
would be:

1 (D1, D2, D3)

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.

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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