Re: Chained slaves smaller?

From: Jon Erdman <postgresql(at)thewickedtribe(dot)net>
To: pgsql-general(at)postgresql(dot)org
Subject: Re: Chained slaves smaller?
Date: 2017-06-23 21:39:20
Message-ID: 710FAF00-3A92-4251-8C92-F606116EF296@thewickedtribe.net
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Nevermind. Turns out it was on the wrong timeline and replication was broken. It was smaller because it was 77 days behind. (facepalm)

> On Jun 23, 2017, at 2:40 PM, Jon Erdman <postgresql(at)thewickedtribe(dot)net> wrote:
>
> Hi,
>
> I have SR set up in a couple of datacenters, where there’s a master in DC_A with 2 slaves, and a 3rd slave off that master in DC_ B. Also, in DC_B I have 2 slaves chained off the “local master”. Our main database is ~551GB in DC_A and on the replica in B that is subscribed to the real master. However, on one of the chained slaves in DC_B that database is only 484GB. The only thing different about this smaller slave is that it was created by taking a basebackup from the “local master” in DC_B rather than sucking it over the WAN from the true master in DC_A.
>
> This makes no sense to me since I thought SR replicas are bit for bit copies, so I’m somewhat concerned. Any ideas how this could be?
> —
> Jon Erdman
> Postgres Zealot

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