From: | Avi Weinberg <AviW(at)gilat(dot)com> |
---|---|
To: | pgsql-generallists(dot)postgresql(dot)org <pgsql-general(at)lists(dot)postgresql(dot)org> |
Subject: | logical replication - who is managing replication slots created automatically during initial sync |
Date: | 2024-08-27 06:53:42 |
Message-ID: | DB9PR07MB7180EA18C0A832E3B59D18B8CB942@DB9PR07MB7180.eurprd07.prod.outlook.com |
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Lists: | pgsql-general |
Hi Experts
I have seen that logical replication slots created automatically by Postgres during initial sync (a slot per table), are marked as "wal_status = lost" and "active = false".
1. Who is responsible for removing those faulty replication slots?
2. Can a slot with "wal_status = lost" recover from this state?
3. Do I need to drop the subscription in such a case?
4. Are those replication slots that synchronize a single table each, use a connection from "max_connections" and replication slot from "max_logical_replication_slots"?
5. If I sync many tables will it be better to increase the number of max_logical_replication_slots or to have some of the tables "wait" for other tables to complete and release the replication slot for them to use.
I'm using Postgres 15.2
slot_name plugin slot_type datoid database temporary active active_pid xmin catalog_xmin restart_lsn confirmed_flush_lsn wal_status safe_wal_size two_phase
pg_8034820_sync_8033089_7371741997992267844 pgoutput logical 16707 aaa_db FALSE FALSE NULL NULL 295098502 NULL D9/EB7317B0 lost NULL FALSE
pg_6839631_sync_6837833_7371741997992267844 pgoutput logical 16707 aaa_db FALSE FALSE NULL NULL 288349892 NULL D2/80068A78 lost NULL FALSE
Thanks!
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