From b84570dece33e43a08be87d1e05c79095aa56d8a Mon Sep 17 00:00:00 2001
From: antirez <antirez@gmail.com>
Date: Tue, 9 Apr 2013 12:13:26 +0200
Subject: [PATCH] Cluster: reconfigure additonal slaves on failover.

---
 src/cluster.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/src/cluster.c b/src/cluster.c
index 57942d0c..9043a4ba 100644
--- a/src/cluster.c
+++ b/src/cluster.c
@@ -912,6 +912,18 @@ int clusterProcessPacket(clusterLink *link) {
                         clusterSetMaster(sender);
                     }
 
+                    /* If we are a slave, and this node used to be a slave
+                     * of our master, and now has the PROMOTED flag set, we
+                     * need to switch our replication setup over it. */
+                    if (flags & REDIS_NODE_PROMOTED &&
+                        server.cluster->myself->flags & REDIS_NODE_SLAVE &&
+                        server.cluster->myself->slaveof == oldmaster)
+                    {
+                        redisLog(REDIS_WARNING,"One of the slaves failed over my master. Reconfiguring myself as a replica of %.40s", sender->name);
+                        clusterDelNodeSlots(server.cluster->myself);
+                        clusterSetMaster(sender);
+                    }
+
                     /* Update config and state. */
                     update_state = 1;
                     update_config = 1;