| I have logical replication setup from a factory in Zhuhai China to a data warehouse in New Jersey. We are using postgresql 10.13 on both sides, on Redhat Linux 7.6. The logical replication has been in “catchup” mode for several days now, stuck at a specific LSN (9EF/89ADF7E0). The slave side seems to be chugging along, generating lots of WAL files — but not actually getting any new records in. The logical replication is being used to move some fairly large files: averaging about 1 MB but with a max up to about 250 MB. (I think I want to fix that longer term, but that’s not a quick fix.) My working hypothesis is that we are stuck on a long transaction: that we can’t get some abnormally large blob over before we drop the line. In this case fixing the connection should fix the problem. Is there a way I can see what is going on? The slave is working hard, but what is it working on? And are there any suggestions on how to handle this? I could restart the logical replication with “copy_data = false”, then fill in the holes by hand. But I would rather not! Thanks in advance! John PS. Output of pg_stat_replication & pg_stat_subscription on master & slave respectively. (Some proprietary information X’d out) select * from pg_stat_replication; -[ RECORD 1 ]----+------------------------------ pid | 42451 usesysid | 10 usename | postgres application_name | china_to_nj_sub client_addr | XXX.XXX.XXX.XXX client_hostname | client_port | 54300 backend_start | 2020-08-03 09:07:07.257454-04 backend_xmin | 16574498 state | catchup sent_lsn | 9EF/89ADF7E0 write_lsn | 9EF/89ADF7E0 flush_lsn | 9EF/89ADF7E0 replay_lsn | 9EF/89ADF7E0 write_lag | flush_lag | replay_lag | sync_priority | 0 sync_state | async select * from pg_stat_subscription; -[ RECORD 1 ]---------+------------------------------ subid | 7222699 subname | china_to_nj_sub pid | 14764 relid | received_lsn | 9EF/89ADF7E0 last_msg_send_time | 2020-08-03 10:15:48.644575-04 last_msg_receipt_time | 2020-08-03 10:14:57.247993-04 latest_end_lsn | 9EF/89ADF7E0 latest_end_time | 2020-08-03 09:30:57.974223-04 John Ashmead 139 Montrose Avenue Rosemont, PA, 19010-1508 (610) 527 9560 mobile (610) 247 2323 |
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