I apologize if this is wrong place to ask the question.
A quote from pglogical FAQ:
> Q. Does pglogical support cascaded replication?
> Subscribers can be configured as publishers as well thus cascaded replication
> can be achieved
> by forwarding/chaining (again no failover though).
The only mentions of forwarding on documentation page are:
> Cascading replication is implemented in the form of changeset forwarding.
> forward_origins - array of origin names to forward, currently only supported
> values are empty
> array meaning don't forward any changes that didn't originate on provider
> node, or "{all}"
> which means replicate all changes no matter what is their origin, default is
> "{all}"
So my question is how to forward changeset using pglogical?
Here's my setup:
There are 3 identical CentOS 7 servers: p1, p2 and p3. Postgres version is
9.5.3.
p1:
select pglogical.create_node
(
node_name := 'node_p1_provider',
dsn := 'host=192.168.1.101 port=5432 dbname=test'
);
select pglogical.replication_set_add_all_tables('default_insert_only',
array['public']);
p2:
select pglogical.create_node(
node_name := 'node_p2_provider_and_subscriber',
dsn := 'host=192.168.1.102 port=5432 dbname=test'
);
select pglogical.replication_set_add_all_tables('default_insert_only',
array['public']);
select pglogical.create_subscription
(
subscription_name => 'sub_p1_to_p2_insert_only',
provider_dsn => 'host=192.168.1.101 port=5432 dbname=test',
replication_sets => array['default_insert_only']
);
p3:
select pglogical.create_node(
node_name := 'node_p3_subscriber',
dsn := 'host=192.168.1.103 port=5432 dbname=test'
);
select pglogical.create_subscription
(
subscription_name => 'sub_p2_to_p3_insert_only',
provider_dsn => 'host=192.168.1.102 port=5432 dbname=test',
replication_sets => array['default_insert_only']
);
Result:
p1:
insert into public.test (col1) values (1);
select count(1) from public.test; -- returns 1;
p2:
insert into public.test (col1) values (2);
select count(1) from public.test; -- returns 2;
p3:
select count(1) from public.test; -- returns 1;
Expected:
p3 recieves all inserts, thus the count on p3 should be 2 (same as on p2).
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