From 091701f363da953695b52cd7b4d7668d47f0258e Mon Sep 17 00:00:00 2001
From: Bar Shaul <88437685+barshaul@users.noreply.github.com>
Date: Tue, 21 Jun 2022 07:40:48 +0300
Subject: [PATCH] Set replicas' configEpoch to 0 when loaded from cluster
 configuration file (#10798)

* Changed clusterLoadConfig to set the config epoch of replica nodes to 0 when loaded.
---
 src/cluster.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/cluster.c b/src/cluster.c
index cdbc565ec..a5d614815 100644
--- a/src/cluster.c
+++ b/src/cluster.c
@@ -308,8 +308,10 @@ int clusterLoadConfig(char *filename) {
         if (atoi(argv[4])) n->ping_sent = mstime();
         if (atoi(argv[5])) n->pong_received = mstime();
 
-        /* Set configEpoch for this node. */
-        n->configEpoch = strtoull(argv[6],NULL,10);
+        /* Set configEpoch for this node.
+         * If the node is a replica, set its config epoch to 0.
+         * If it's a primary, load the config epoch from the configuration file. */
+        n->configEpoch = (nodeIsSlave(n) && n->slaveof) ? 0 : strtoull(argv[6],NULL,10);
 
         /* Populate hash slots served by this instance. */
         for (j = 8; j < argc; j++) {