| From: | Kenny Bachman <kenny(dot)bachman17(at)gmail(dot)com> |
|---|---|
| To: | pgsql-admin(at)lists(dot)postgresql(dot)org |
| Subject: | postgresql replication replay lag |
| Date: | 2021-12-27 16:22:26 |
| Message-ID: | CAC0w7LJFsyvkJe26hSZQHZiY5c=kHyVdy8-1CFfRdGNbpO4VMQ@mail.gmail.com |
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| Thread: | |
| Lists: | pgsql-admin |
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
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