Re: Create a logical and physical replication

["Deepak Pahuja ." <deepakpahuja@xxxxxxxxxxx>]

Yes it is possible.

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From: Ashok Kumar Tiwari <ashokt@xxxxxxxxxxxxxxxxxx>
Sent: Tuesday, November 5, 2019 7:12:45 PM
To: Kyotaro Horiguchi <horikyota.ntt@xxxxxxxxx>
Cc: Rui DeSousa <rui@xxxxxxxxxxxxx>; Shital A <brightuser2019@xxxxxxxxx>; pgsql-general@xxxxxxxxxxxxxxxxxxxx <pgsql-general@xxxxxxxxxxxxxxxxxxxx>; pgsql-admin@xxxxxxxxxxxxxxxxxxxx <pgsql-admin@xxxxxxxxxxxxxxxxxxxx>
Subject: Re: Create a logical and physical replication

 

its possible to cascade a logical replication from a binary slave replica?  

On Tue, Nov 5, 2019 at 11:25 AM Kyotaro Horiguchi <horikyota.ntt@xxxxxxxxx> wrote:

Hello.

At Mon, 4 Nov 2019 19:05:24 +0530, Ashok Kumar Tiwari <ashokt@xxxxxxxxxxxxxxxxxx> wrote in
> is it possible in postgres to create one physical replica for DR(data
> recovery purpose) and another one logical replica for reporting purpose

A physical replication standby cannot be a publisher. You will find
that CREATE PUBLICATION fails.

> master --------> physical standby (for DR  Purpose)
>     |
>     |
>     |
>     |
> logical replica for reporting purpose
>
> ------------------ or cascading logic replication
>
>   master --------> physical standby (for DR  Purpose) ------------- >
> logical replica for reporting purpose

The former works (as documented in [1]) but the latter doesn't.


By the way, If I'm not missing anything I don't find a description on
this restriction in the documentation.  Shouldn't it be in [2], or
[1]?

[1]: https://www.postgresql.org/docs/12/logical-replication.html
[2]: https://www.postgresql.org/docs/12/logical-replication-restrictions.html

regards.

--
Kyotaro Horiguchi
NTT Open Source Software Center

--

Ashok Kumar Tiwari,

Senior Technical Consultant,

ashokt@xxxxxxxxxxxxxxxxxx,

M:+91-9657628833

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