Thanks for the clarification.
A follow up question, then, given *once joined all nodes are equal*, is that:
should the node A dies or taken out of the group, the remaining three node group (with B, C and D) would continue to
functionproperly, correct?
[somewhere I saw the term "downstream" nodes was used, and I am not clear what that meant in the context of a
mesh-connectedgroup]
Thanks again
-----Original Message-----
From: Craig Ringer [mailto:craig@2ndquadrant.com]
Sent: Wednesday, June 07, 2017 5:59 PM
To: Zhu, Joshua <jzhu@thalesesec.net>
Cc: pgsql-general@postgresql.org
Subject: Re: [GENERAL] How does BDR replicate changes among nodes in a BDR group
On 8 June 2017 at 04:50, Zhu, Joshua <jzhu@vormetric.com> wrote:
> How does BDR replicate a change delta on A to B, C, and D?
It's a mesh.
Once joined, it doesn't matter what the join node was, all nodes are equal.
> e.g., A
> replicates delta to B and D, and B to C, or some other way, or not
> statically determined?
Each node replicates to all other nodes in an undefined order determined by network timing etc.
--
Craig Ringer http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services