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From: Sacheen Birhade <[email protected]>
To: [email protected] <[email protected]>
Subject: How to choose new master from slaves.
Date: Thu, 4 Aug 2022 07:33:00 +0000
Message-ID: <MW4PR20MB4525A0AEC2F749ED7ACA9710F39F9@MW4PR20MB4525.namprd20.prod.outlook.com> (raw)

Hi All,

I have a very basic question about streaming replication feature of Postgres.
Let's assume I have servers A, B, C, D, & E with postgres installed with streaming replication as follow:
A  -->  B ( sync replication )
A  -->  C ( async replication )
A  -->  D ( async replication )
A  -->  E ( async replication )
A is master & rest are slaves.

Now my question is:
Assume replication link between A & B may/may not stable.  If A goes down, how will I choose my new master from slaves? What are criteria to choose new master?

Thanks,
Sacheen Birhade

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