From 434e6b2da368bbcf4d8aa6153f39e0479deb063b Mon Sep 17 00:00:00 2001
From: antirez <antirez@gmail.com>
Date: Fri, 2 Dec 2016 10:21:20 +0100
Subject: [PATCH] PSYNC2: Do not accept WAIT in slave instances.

No longer makes sense since writable slaves only do local writes now:
writes are no longer passed to sub-slaves in the stream.
---
 src/replication.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/replication.c b/src/replication.c
index 28a37786..94287f9d 100644
--- a/src/replication.c
+++ b/src/replication.c
@@ -2362,6 +2362,11 @@ void waitCommand(client *c) {
     long numreplicas, ackreplicas;
     long long offset = c->woff;
 
+    if (server.masterhost) {
+        addReplyError(c,"WAIT cannot be used with slave instances. Please also note that since Redis 4.0 if a slave is configured to be writable (which is not the default) writes to slaves are just local and are not propagated.");
+        return;
+    }
+
     /* Argument parsing. */
     if (getLongFromObjectOrReply(c,c->argv[1],&numreplicas,NULL) != C_OK)
         return;