Re: [HACKERS] Logical replication in the same cluster

Petr Jelinek <petr.jelinek@2ndquadrant.com> writes:
> On 26/04/17 18:59, Bruce Momjian wrote:
>> ... it just hangs.  My server logs say:

> Yes that's result of how logical replication slots work, the transaction
> that needs to finish is your transaction. It can be worked around by
> creating the slot manually via the SQL interface for example and create
> the subscription using WITH (NOCREATE SLOT, SLOT NAME = 'your slot') .

If that's a predictable deadlock, I think a minimum expectation is that
the system should notice it and throw an error, not just hang.  (Then
the error could give a hint about how to work around it.)  But the case
Bruce has in mind doesn't seem like a crazy use-case to me.  Can't we
make it "just work"?
        regards, tom lane