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Do not allow ALTER SUBSCRIPTION ... SET (failover = on|off) in a transaction block as the changed failover option of the slot can't be rolled back. For the same reason, we refrain from altering the replication slot's failover property if the subscription is created with a valid slot_name and create_slot=false. Reprted-by: Kuroda Hayato Author: Hou Zhijie Reviewed-by: Shveta Malik, Bertrand Drouvot, Kuroda Hayato Discussion: https://postgr.es/m/OS0PR01MB57165542B09DFA4943830BF294082@OS0PR01MB5716.jpnprd01.prod.outlook.com