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Amit Kapila ddd5f4f54a Add a slot synchronization function. ... This commit introduces a new SQL function pg_sync_replication_slots() which is used to synchronize the logical replication slots from the primary server to the physical standby so that logical replication can be resumed after a failover or planned switchover. A new 'synced' flag is introduced in pg_replication_slots view, indicating whether the slot has been synchronized from the primary server. On a standby, synced slots cannot be dropped or consumed, and any attempt to perform logical decoding on them will result in an error. The logical replication slots on the primary can be synchronized to the hot standby by using the 'failover' parameter of pg-create-logical-replication-slot(), or by using the 'failover' option of CREATE SUBSCRIPTION during slot creation, and then calling pg_sync_replication_slots() on standby. For the synchronization to work, it is mandatory to have a physical replication slot between the primary and the standby aka 'primary_slot_name' should be configured on the standby, and 'hot_standby_feedback' must be enabled on the standby. It is also necessary to specify a valid 'dbname' in the 'primary_conninfo'. If a logical slot is invalidated on the primary, then that slot on the standby is also invalidated. If a logical slot on the primary is valid but is invalidated on the standby, then that slot is dropped but will be recreated on the standby in the next pg_sync_replication_slots() call provided the slot still exists on the primary server. It is okay to recreate such slots as long as these are not consumable on standby (which is the case currently). This situation may occur due to the following reasons: - The 'max_slot_wal_keep_size' on the standby is insufficient to retain WAL records from the restart_lsn of the slot. - 'primary_slot_name' is temporarily reset to null and the physical slot is removed. The slot synchronization status on the standby can be monitored using the 'synced' column of pg_replication_slots view. A functionality to automatically synchronize slots by a background worker and allow logical walsenders to wait for the physical will be done in subsequent commits. Author: Hou Zhijie, Shveta Malik, Ajin Cherian based on an earlier version by Peter Eisentraut Reviewed-by: Masahiko Sawada, Bertrand Drouvot, Peter Smith, Dilip Kumar, Nisha Moond, Kuroda Hayato, Amit Kapila Discussion: https://postgr.es/m/514f6f2f-6833-4539-39f1-96cd1e011f23@enterprisedb.com		1 year ago
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binary.sql	test_decoding: Protect against rare spurious test failures.	10 years ago
ddl.sql	Make test_decoding ddl.out shorter	2 years ago
decoding_in_xact.sql	Revert "Logical decoding of sequences"	3 years ago
decoding_into_rel.sql	Revert "Logical decoding of sequences"	3 years ago
messages.sql	Add flush option to pg_logical_emit_message()	2 years ago
permissions.sql	Add a slot synchronization function.	1 year ago
prepared.sql	Add skip-empty-xacts option to test_decoding for use in the regression tests.	11 years ago
replorigin.sql	Fix the misuse of origin filter across multiple pg_logical_slot_get_changes() calls.	2 years ago
rewrite.sql	Revert "Logical decoding of sequences"	3 years ago
slot.sql	Add a slot synchronization function.	1 year ago
spill.sql	Make contrib/test_decoding regression tests safe for CZ locale.	9 years ago
stats.sql	pgstat: add/extend tests for resetting various kinds of stats.	3 years ago
stream.sql	Fix assertion during streaming of multi-insert toast changes.	4 years ago
time.sql	logical decoding: fix decoding of a commit's commit time.	9 years ago
toast.sql	Revert "Logical decoding of sequences"	3 years ago
truncate.sql	Revert "Logical decoding of sequences"	3 years ago
twophase.sql	test_decoding: Remove unnecessary table in twophase test	2 years ago
twophase_stream.sql	Add option to enable two_phase commits via pg_create_logical_replication_slot.	4 years ago
xact.sql	Don't propagate a null subtransaction snapshot up to parent transaction.	9 years ago