Re: How does BDR replicate changes among nodes in a BDR group

From: Craig Ringer <craig(at)2ndquadrant(dot)com>
To: "Zhu, Joshua" <jzhu(at)vormetric(dot)com>
Cc: "pgsql-general(at)postgresql(dot)org" <pgsql-general(at)postgresql(dot)org>
Subject: Re: How does BDR replicate changes among nodes in a BDR group
Date: 2017-06-08 00:58:43
Message-ID: CAMsr+YG46tfO2bY2wcwoRo2g-cEeaE6hrDqbER0Zq8riqC0NtQ@mail.gmail.com
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On 8 June 2017 at 04:50, Zhu, Joshua <jzhu(at)vormetric(dot)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

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