Re: Would-be standby-node phoning home every 5 seconds. Why?

[SOzcn <selahattinozcnma@xxxxxxxxx>]

Hello Ron, Can you check your "max_wal_senders" parameter value?
This is must come from the "max_wal_senders" parameter, if you set this as 5 seconds it's going to check this for each 5 second.

If you want to disable this, parameter value must be 0.

Have a nice day! 

Ron Johnson <ronljohnsonjr@xxxxxxxxx>, 19 Ara 2023 Sal, 17:08 tarihinde şunu yazdı:

PG 14.10

I had initiated streaming replication on a pair of new instances from Node A to Node B, and then stopped it via:

SELECT pg_terminate_backend(<wallreceiver pid>);

SELECT pg_drop_replication_slot(<slot name>);

That seemed to work, since Node A isn't replicating anymore:

postgres=# SELECT * from pg_replication_slots;
(0 rows)

postgres=#
postgres=# SELECT * from pg_stat_replication;
(0 rows)

Node B, unsurprisingly, doesn't have anything in pg_stat_wal_receiver.

$ psql --host=NodeB -xc "SELECT * FROM pg_stat_wal_receiver;"
(0 rows)

And yet, Node B tries to initialize replication every 5 seconds.  An excerpt from the log file:

2023-12-19 08:53:52.778 EST  NodeB  replicator   202014  initializing  53300   FATAL:  53300: number of requested standby connections exceeds max_wal_senders (currently 0)
2023-12-19 08:53:52.778 EST  NodeB  replicator   202014  initializing  53300   LOCATION:  InitProcess, proc.c:358