From d6c70f22cd1a2d9b96e761183ef4dd0ab42fd310 Mon Sep 17 00:00:00 2001
From: antirez <antirez@gmail.com>
Date: Mon, 4 Dec 2017 10:24:52 +0100
Subject: [PATCH] DEBUG change-repl-id implemented.

With PSYNC2 to force a full SYNC in tests is hard. With this new DEBUG
subcommand we just need to call it and then CLIENT KILL TYPE master in
the slave.
---
 src/debug.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/debug.c b/src/debug.c
index 5c3fd3471..2b3d51fcc 100644
--- a/src/debug.c
+++ b/src/debug.c
@@ -308,6 +308,8 @@ void debugCommand(client *c) {
         "structsize -- Return the size of different Redis core C structures.");
         blen++; addReplyStatus(c,
         "htstats <dbid> -- Return hash table statistics of the specified Redis database.");
+        blen++; addReplyStatus(c,
+        "change-repl-id -- Change the replication IDs of the instance. Dangerous, should be used only for testing the replication subsystem.");
         setDeferredMultiBulkLength(c,blenp,blen);
     } else if (!strcasecmp(c->argv[1]->ptr,"segfault")) {
         *((char*)-1) = 'x';
@@ -549,6 +551,11 @@ void debugCommand(client *c) {
         stats = sdscat(stats,buf);
 
         addReplyBulkSds(c,stats);
+    } else if (!strcasecmp(c->argv[1]->ptr,"change-repl-id") && c->argc == 2) {
+        serverLog(LL_WARNING,"Changing replication IDs after receiving DEBUG change-repl-id");
+        changeReplicationId();
+        clearReplicationId2();
+        addReply(c,shared.ok);
     } else {
         addReplyErrorFormat(c, "Unknown DEBUG subcommand or wrong number of arguments for '%s'",
             (char*)c->argv[1]->ptr);