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Can I synchronize two master DB clusters using logical replication? - Mailing list pgsql-admin

From JaeWon Lee
Subject Can I synchronize two master DB clusters using logical replication?
Date
Msg-id CAC+TV7F3D_vo2VNSOQJL-u1NxMVSDpWX_RPA8u7Y_BHELi+cpg@mail.gmail.com
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Hi ^^
I have two DB clusters. One is in South Korea, and the other is in US.
Each cluster generates its own DML commands. (INSERT, UPDATE, DELETE)
And I want to synchronize this two DB clusters using logical replication.
I tried  this, but it failed.
Specifically, I succeeded to replicate one DB cluster to the other.
But when I set logical replication in both cluster, only the former which I set first works.
Can I use logical replication to synchronize two master DB clusters?
The following is what I did.

[ In Korea cluster ] ------------------------------------------------------------------------------------
- postgresql.conf
wal_level = logical

- pg_hba.conf
# IPv4 local connections:
host    <KR DB name>            postgres        <US server IP>/32        md5

CREATE PUBLICATION mypubKR FOR ALL TABLES;

CREATE SUBSCRIPTION mysubKR CONNECTION 'host=<US server IP> port=5432 user=postgres dbname=<US DB name> password=<password>' PUBLICATION mypubUS;

[ In US cluster ] -----------------------------------------------------------------------------------------

- postgresql.conf
wal_level = logical

- pg_hba.conf# IPv4 local connections:
host    <US DB name>           postgres        <KR server IP>/32         md5

CREATE PUBLICATION mypubUS FOR ALL TABLES;

CREATE SUBSCRIPTION mysubUS CONNECTION 'host=<KR server IP> port=5432 user=postgres dbname=<KR DB name> password=<password>' PUBLICATION mypubKR;
---------------------------------------------------------------------------------------------------------------------

If I make 'mysubKR' first and 'mysubUS' later, replication from US to Korea works well. But Korea to US doesn't work.
If I make 'mysubUS' first and 'mysubKR' later, replication from Korea to US works well. But US to Korea doesn't work.
I hope both direction work well.
How can I solve this problem?

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