Is it safe to transfer logical replication publication/subscription?
Mike Lissner <[email protected]> Wed, 8 Jan 2020 13:22:38 -0800
| Newsgroups | gmane.comp.db.postgresql.general |
|---|---|
| Message-ID | <CAMp9=EwMa=LVtFhFZeYUyO7EzLLKiy3A6vA5tG-pyBq4S52QFw@mail.gmail.com> |
Hi all, this is a follow up from an earlier question I asked about shortening a chain of logically replicating servers. Right now we have three servers replicating like this: A --> B --> C And we want to remove B so that we have: A --> C Is it possible to DROP the subscription on B to A and then to SUBSCRIBE C to the previously used publication on A without losing data? E.g., assuming the following: - "A" has a PUBLICATION named "A-to-B-Pub" that "B" subscribes to. - "C" subscribes to "B" with a subscription named "B-to-C-Sub". Would this work? 1. On B, DROP the subscription to "A-to-B-Pub". 2. Let any cached changes on B flush to C. Give it an hour to be sure. 3. On C ALTER "B-to-C-Sub" to subscribe to the now-used "A-to-B-Pub" on A. Seems like this would either work perfectly or totally fail. Any ideas? Thanks for any help, Mike