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help / color / mirror / Atom feedFrom: Alvaro Herrera <[email protected]>
To: Kumar, Sachin <[email protected]>
Cc: [email protected] <[email protected]>
Subject: Re: Initial Schema Sync for Logical Replication
Date: Sat, 18 Mar 2023 13:06:38 +0100
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
On 2023-Mar-15, Kumar, Sachin wrote:
> 1. In CreateSubscription() when we create replication slot(walrcv_create_slot()), should
> use CRS_EXPORT_SNAPSHOT, So that we can use this snapshot later in the pg_dump.
>
> 2. Now we can call pg_dump with above snapshot from CreateSubscription.
Overall I'm not on board with the idea that logical replication would
depend on pg_dump; that seems like it could run into all sorts of
trouble (what if calling external binaries requires additional security
setup? what about pg_hba connection requirements? what about
max_connections in tight circumstances?).
It would be much better, I think, to handle this internally in the
publisher instead: similar to how DDL sync would work, except it'd
somehow generate the CREATE statements from the existing tables instead
of waiting for DDL events to occur. I grant that this does require
writing a bunch of new code for each object type, a lot of which would
duplicate the pg_dump logic, but it would probably be a lot more robust.
--
Álvaro Herrera PostgreSQL Developer — https://www.EnterpriseDB.com/
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