Dhirendra Singh <dhirendraks@xxxxxxxxx> writes: > Hi, > My postgres version is 14.2 > I have setup streaming replication between a primary and a standby using replication slot and without > archive. > I have created replication slot "slot1" on the primary. > I did switchover following below steps. > 1. shutdown the primary server. > 2. created replicated slot "slot1" on standby and promoted it to primary. > 3. run pg_rewind on the old primary and made it standby. > 4. started the old primary as new standby. > > I got following error in the new standby. it is complaining about missing wal file on the new primary. > > 2022-10-13 12:58:48.497 UTC [25] LOG: fetching timeline history file for timeline 2 from primary > server > 2022-10-13 12:58:48.508 UTC [25] LOG: started streaming WAL from primary at 0/B000000 on > timeline 1 > 2022-10-13 12:58:48.508 UTC [25] FATAL: could not receive data from WAL stream: ERROR: > requested WAL segment 00000002000000000000000B has already been removed > 2022-10-13 12:58:48.509 UTC [21] LOG: new target timeline is 2 > 2022-10-13 12:58:48.580 UTC [28] LOG: started streaming WAL from primary at 0/B000000 on > timeline 2 > 2022-10-13 12:58:48.580 UTC [28] FATAL: could not receive data from WAL stream: ERROR: > requested WAL segment 00000002000000000000000B has already been removed > > why the new primary has removed the wal file even though i created replication slot on it before > promoting. > value of max_slot_wal_keep_size is -1 and wal_keep_size is 0 Dunno but did you call the pg_create_physical_replication_slot() function with arg2=true to have it immediately keep the WAL pointer? I believe otherwise not until the slot has been connected to does it retain anything. HTH > > Thanks, > Dhirendra.
