Dear Hou, > Kuroda-San reported an issue off-list that: > > If user execute ALTER SUBSCRIPTION SET (failover) command inside a txn block > and rollback, only the subscription option change can be rolled back, while > the > replication slot's failover change is preserved. > > This is because ALTER SUBSCRIPTION SET (failover) command internally > executes > the replication command ALTER_REPLICATION_SLOT to change the replication > slot's > failover property, but this replication command execution cannot be > rollback. > > To fix it, I think we can prevent user from executing ALTER SUBSCRIPTION set > (failover) inside a txn block, which is also consistent to the ALTER > SUBSCRIPTION REFRESH/DROP SUBSCRIPTION command. Attach a small > patch to address this.
Thanks for posting the patch, the fix is same as my expectation. Also, should we add the restriction to the doc? I feel [1] can be updated. [1]:https://www.postgresql.org/docs/devel/sql-altersubscription.html#SQL-ALTERSUBSCRIPTION-PARAMS-SET Best Regards, Hayato Kuroda FUJITSU LIMITED https://www.fujitsu.com/
