Re: Synchronizing slots from primary to standby

On Fri, Feb 9, 2024 at 10:00 AM Zhijie Hou (Fujitsu)
<houzj(dot)fnst(at)fujitsu(dot)com> wrote:
>

Few comments on 0001
===================
1. Shouldn't pg_sync_replication_slots() check whether the user has
replication privilege?

2. The function declarations in slotsync.h don't seem to be in the
same order as they are defined in slotsync.c. For example, see
ValidateSlotSyncParams(). The same is true for new functions exposed
via walreceiver.h and walsender.h. Please check the patch for other
such inconsistencies.

3.
+# Wait for the standby to finish sync
+$standby1->wait_for_log(
+ qr/LOG: ( [A-Z0-9]+:)? newly created slot \"lsub1_slot\" is sync-ready now/,
+ $offset);
+
+$standby1->wait_for_log(
+ qr/LOG: ( [A-Z0-9]+:)? newly created slot \"lsub2_slot\" is sync-ready now/,
+ $offset);
+
+# Confirm that the logical failover slots are created on the standby and are
+# flagged as 'synced'
+is($standby1->safe_psql('postgres',
+ q{SELECT count(*) = 2 FROM pg_replication_slots WHERE slot_name IN
('lsub1_slot', 'lsub2_slot') AND synced;}),
+ "t",
+ 'logical slots have synced as true on standby');

Isn't the last test that queried pg_replication_slots sufficient? I
think wait_for_log() would be required for slotsync worker or am I
missing something?

Apart from the above, I have modified a few comments in the attached.

--
With Regards,
Amit Kapila.