Sentinel: allow SHUTDOWN command in Sentinel mode.

src/db.c

@@ -595,11 +595,13 @@ void shutdownCommand(redisClient *c) {
             return;
         }
     }
-    /* SHUTDOWN can be called even while the server is in "loading" state.
-     * When this happens we need to make sure no attempt is performed to save
+    /* When SHUTDOWN is called while the server is loading a dataset in
+     * memory we need to make sure no attempt is performed to save
      * the dataset on shutdown (otherwise it could overwrite the current DB
-     * with half-read data). */
-    if (server.loading)
+     * with half-read data).
+     *
+     * Also when in Sentinel mode clear the SAVE flag and force NOSAVE. */
+    if (server.loading || server.sentinel_mode)
         flags = (flags & ~REDIS_SHUTDOWN_SAVE) | REDIS_SHUTDOWN_NOSAVE;
     if (prepareForShutdown(flags) == REDIS_OK) exit(0);
     addReplyError(c,"Errors trying to SHUTDOWN. Check logs.");

src/redis.c

@@ -2080,7 +2080,8 @@ int prepareForShutdown(int flags) {
     }
     /* Close the listening sockets. Apparently this allows faster restarts. */
     closeListeningSockets(1);
-    redisLog(REDIS_WARNING,"Redis is now ready to exit, bye bye...");
+    redisLog(REDIS_WARNING,"%s is now ready to exit, bye bye...",
+        server.sentinel_mode ? "Sentinel" : "Redis");
     return REDIS_OK;
 }
 

src/sentinel.c

@@ -377,7 +377,8 @@ struct redisCommand sentinelcmds[] = {
     {"unsubscribe",unsubscribeCommand,-1,"",0,NULL,0,0,0,0,0},
     {"psubscribe",psubscribeCommand,-2,"",0,NULL,0,0,0,0,0},
     {"punsubscribe",punsubscribeCommand,-1,"",0,NULL,0,0,0,0,0},
-    {"info",sentinelInfoCommand,-1,"",0,NULL,0,0,0,0,0}
+    {"info",sentinelInfoCommand,-1,"",0,NULL,0,0,0,0,0},
+    {"shutdown",shutdownCommand,-1,"",0,NULL,0,0,0,0,0}
 };
 
 /* This function overwrites a few normal Redis config default with Sentinel