Hello PG Team,
I have a 3-nodes Patroni cluster with PG 12.9. There is a replay lag on the third node. I don't understand why there is lag. The replication view output is below :
Extra info: There is no long-running query on the third node.
Where can I check to detect what's causing this?
Thank you,
Best,
Kenny
-[ RECORD 1 ]----+------------------------------
pid | 1442401
usesysid | 15302
usename | replicator
application_name | henb
client_addr | 10.109.15.94
client_hostname | henb.acc
client_port | 43286
backend_start | 2021-11-13 15:16:43.462115
backend_xmin |
state | streaming
sent_lsn | 8E66/4FC9F618
write_lsn | 8E66/4FC9F618
flush_lsn | 8E66/4FC9F618
replay_lsn | 8E66/4F58F000
write_lag | 00:00:00.000653
flush_lag | 00:00:00.00126
replay_lag | 00:00:05.463059
sync_priority | 0
sync_state | async
reply_time | 2021-12-27 17:02:56.750262+03
-[ RECORD 2 ]----+------------------------------
pid | 1390172
usesysid | 15302
usename | replicator
application_name | henc
client_addr | 10.109.15.95
client_hostname | henc.acc
client_port | 47982
backend_start | 2021-11-13 15:19:42.065277
backend_xmin |
state | streaming
sent_lsn | 8E66/4FC9F618
write_lsn | 8E66/4FC9F618
flush_lsn | 8E66/4FC9F618
replay_lsn | 8E63/6E340B20
write_lag | 00:00:00.010311
flush_lag | 00:00:00.01101
replay_lag | 02:00:15.147839
sync_priority | 0
sync_state | async
reply_time | 2021-12-27 17:02:56.7555