From 5e4bdb5a1b3b748ba95ae58fec893b48b918663a Mon Sep 17 00:00:00 2001
From: Ian Barwick <ian@2ndquadrant.com>
Date: Fri, 30 Mar 2018 12:02:34 +0900
Subject: [PATCH] repmgrd: handle failover with two nodes in the primary
 location

If two nodes were in the primary location, and at least one node in
another location, the non-failed node in the primary location was not
recognising itself as a promotion candidate.

Addresses GitHub #407.
---
 HISTORY            | 2 ++
 repmgrd-physical.c | 8 ++++++++
 2 files changed, 10 insertions(+)

diff --git a/HISTORY b/HISTORY
index 684a20fb..ba210e58 100644
--- a/HISTORY
+++ b/HISTORY
@@ -4,6 +4,8 @@
         repmgr: poll demoted primary after restart as a standby during a
           switchover operation; GitHub #408 (Ian)
         repmgrd: fix memory leaks in witness code (AndrzejNowicki, Martín)
+        repmgrd: handle failover situation with only two nodes in the primary
+          location, and at least one node in another location; GitHub #407 (Ian)
         repmgrd: set "connect_timeout=2" when pinging a server (Ian)
 
 4.0.4   2018-03-09
diff --git a/repmgrd-physical.c b/repmgrd-physical.c
index c429f92d..d76f5a81 100644
--- a/repmgrd-physical.c
+++ b/repmgrd-physical.c
@@ -2554,6 +2554,14 @@ do_election(void)
 			return ELECTION_NOT_CANDIDATE;
 		}
 	}
+	else
+	{
+		/* standby nodes found - check if we're in the primary location befor checking theirs */
+		if (strncmp(upstream_node_info.location, local_node_info.location, MAXLEN) == 0)
+		{
+			primary_location_seen = true;
+		}
+	}
 
 	/* get our lsn */
 	local_node_info.last_wal_receive_lsn = get_last_wal_receive_location(local_conn);