问题
I'm trying to setup a push-from-server functionality based on PostgreSQL, pglogical and PostgreSQL's listen-notify mechanism. On my replicated table I've setup a trigger that uses pg_notify to push messages to queue after insert. Altered the trigger to "enable always trigger". With this setup, the behavior is not what I expected.
After setting up a listen client (another postgresql console, also tried multiple python drivers, behavior is always the same), I don't get the notifications until I send another notification from another process that is not triggered by replication. Once I send the notification by hand, I get all the notifications pushed from the trigger alongside the one I've sent manually.
Any help appreciated.
回答1:
This is a bug with PostgreSQL. NOTIFY's coming from triggers that are triggered by logical replication don't properly trigger notifications. It's getting worked on.
Followed here from this question.
来源：https://stackoverflow.com/questions/48641038/notify-from-trigger-on-pglogical-replicated-table