From c393308b69d229b664391ac583b9e07418d411b6 Mon Sep 17 00:00:00 2001
From: Amit Kapila
Date: Thu, 25 Jan 2024 12:15:46 +0530
Subject: Allow to enable failover property for replication slots via SQL API.

This commit adds the failover property to the replication slot. The
failover property indicates whether the slot will be synced to the standby
servers, enabling the resumption of corresponding logical replication
after failover. But note that this commit does not yet include the
capability to sync the replication slot; the subsequent commits will add
that capability.

A new optional parameter 'failover' is added to the
pg_create_logical_replication_slot() function. We will also enable to set
'failover' option for slots via the subscription commands in the
subsequent commits.

The value of the 'failover' flag is displayed as part of
pg_replication_slots view.

Author: Hou Zhijie, Shveta Malik, Ajin Cherian
Reviewed-by: Peter Smith, Bertrand Drouvot, Dilip Kumar, Masahiko Sawada, Nisha Moond, Kuroda, Hayato, Amit Kapila
Discussion: https://postgr.es/m/514f6f2f-6833-4539-39f1-96cd1e011f23@enterprisedb.com
---
 src/include/replication/slot.h | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

(limited to 'src/include/replication')

diff --git a/src/include/replication/slot.h b/src/include/replication/slot.h
index 9e39aaf3037..db9bb222661 100644
--- a/src/include/replication/slot.h
+++ b/src/include/replication/slot.h
@@ -111,6 +111,12 @@ typedef struct ReplicationSlotPersistentData
 
 	/* plugin name */
 	NameData	plugin;
+
+	/*
+	 * Is this a failover slot (sync candidate for standbys)? Only relevant
+	 * for logical slots on the primary server.
+	 */
+	bool		failover;
 } ReplicationSlotPersistentData;
 
 /*
@@ -218,7 +224,7 @@ extern void ReplicationSlotsShmemInit(void);
 /* management of individual slots */
 extern void ReplicationSlotCreate(const char *name, bool db_specific,
 								  ReplicationSlotPersistency persistency,
-								  bool two_phase);
+								  bool two_phase, bool failover);
 extern void ReplicationSlotPersist(void);
 extern void ReplicationSlotDrop(const char *name, bool nowait);
 
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