Re: Proposal: Generic WAL logical messages

From: Artur Zakirov <a(dot)zakirov(at)postgrespro(dot)ru>
To: Craig Ringer <craig(at)2ndquadrant(dot)com>
Cc: David Steele <david(at)pgmasters(dot)net>, Petr Jelinek <petr(at)2ndquadrant(dot)com>, Simon Riggs <simon(at)2ndquadrant(dot)com>, Andres Freund <andres(at)anarazel(dot)de>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Proposal: Generic WAL logical messages
Date: 2016-03-18 12:36:37
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On 17.03.2016 15:42, Craig Ringer wrote:
> Would you mind sharing the plugin here? I could add it to
> src/test/modules and add some t/ tests so it runs under the TAP test
> framework.
> --
> Craig Ringer
> PostgreSQL Development, 24x7 Support, Training & Services

Of course. I attached it.

In a provider node you need to set shared_preload_libraries to

In a subscriber node you need:
1 - install pg_ddl_decode by the command:

CREATE EXTENSION pg_ddl_decode;

2 - call the function:

SELECT ddl_create_slot('host=providerhost port=5432 dbname=db');

3 - after some DDL queries in provider you need to execute in a
subscriber the command manually:

SELECT ddl_get_changes('host=providerhost port=5432 dbname=db');

I warn that this plugin has ugly code sometimes. And ddl_get_changes()
has a infinite loop. But it shows concept of DDL replication.

Also this plugin uses some functions from pglogical_output and pglogical.

Earlier I have did tests with pglogical. I attached the patch for pglogical.

Artur Zakirov
Postgres Professional:
Russian Postgres Company

Attachment Content-Type Size application/zip 9.1 KB
pglogical-ddl.patch text/x-patch 12.5 KB

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