Use commands (effects) replication by default in scripts.

See issue #5250 and issue #5292 for more info.

src/config.c

@@ -677,6 +677,8 @@ void loadServerConfigFromString(char *config) {
             }
         } else if (!strcasecmp(argv[0],"lua-time-limit") && argc == 2) {
             server.lua_time_limit = strtoll(argv[1],NULL,10);
+        } else if (!strcasecmp(argv[0],"lua-replicate-commands") && argc == 2) {
+            server.lua_always_replicate_commands = yesnotoi(argv[1]);
         } else if (!strcasecmp(argv[0],"slowlog-log-slower-than") &&
                    argc == 2)
         {

src/scripting.c

@@ -917,7 +917,6 @@ void scriptingInit(int setup) {
         server.lua_client = NULL;
         server.lua_caller = NULL;
         server.lua_timedout = 0;
-        server.lua_always_replicate_commands = 0; /* Only DEBUG can change it.*/
         ldbInit();
     }
 

src/server.c

@@ -1715,6 +1715,12 @@ void initServerConfig(void) {
     server.assert_line = 0;
     server.bug_report_start = 0;
     server.watchdog_period = 0;
+
+    /* By default we want scripts to be always replicated by effects
+     * (single commands executed by the script), and not by sending the
+     * script to the slave / AOF. This is the new way starting from
+     * Redis 5. However it is possible to revert it via redis.conf. */
+    server.lua_always_replicate_commands = 1;
 }
 
 extern char **environ;