Merge branch 'develop' into MAX-309

Merge branch 'develop' into MAX-309

.gitignore

@@ -30,6 +30,7 @@ depend.mk
 *~
 *#
 .#*
+._*
 
 # Vi swap files
 .*.swp

server/core/dbusers.c

@@ -230,7 +230,6 @@ int add_mysql_users_with_host_ipv4(USERS *users, char *user, char *host, char *p
 		tmp = ret_ip+strlen(ret_ip)-1;
 
 		/* start from Class C */
-
 		while(tmp > ret_ip) {
 			if (*tmp == '%') {
 				/* set only the last IPv4 byte to 1

server/core/secrets.c

@@ -65,6 +65,7 @@ MAXKEYS		*keys;
 struct stat 	secret_stats;
 int		fd;
 int             len;
+static int	reported = 0;
 
         home = getenv("MAXSCALE_HOME");
 
@@ -80,12 +81,16 @@ int             len;
                 errno = 0;
 		if (eno == ENOENT)
 		{
-			LOGIF(LM, (skygw_log_write(
+			if (!reported)
+			{
+				LOGIF(LM, (skygw_log_write(
 				LOGFILE_MESSAGE,
 				"Encrypted password file %s can't be accessed "
 				"(%s). Password encryption is not used.",
 				secret_file,
 				strerror(eno))));
+				reported = 1;
+			}
 		}
 		else
 		{

server/modules/routing/readwritesplit/readwritesplit.c

@@ -1064,10 +1064,21 @@ static bool get_dcb(
 
 	/** get root master from available servers */
 	master_bref = get_root_master_bref(rses);
+	/**
+	 * If master can't be found, session will be closed.
+	 */
+	if (master_bref == NULL)
+	{
+		succp = false;
+		goto return_succp;
+	}
 #if defined(SS_DEBUG)
-	
 	master_host = get_root_master(backend_ref, rses->rses_nbackends);
-	ss_dassert(master_bref->bref_backend == master_host);
+	if (master_bref->bref_backend != master_host)
+	{
+		LOGIF(LT, (skygw_log_write(LOGFILE_TRACE,
+			"Master has changed.")));
+	}
 #endif
 	if (name != NULL) /*< Choose backend by name from a hint */
 	{
@@ -1714,6 +1725,7 @@ static int routeQuery(
 		querybuf = gwbuf_make_contiguous(querybuf);
 	}
         
+        /** Read stored master DCB pointer */
         master_dcb = router_cli_ses->rses_master_ref->bref_dcb;
         CHK_DCB(master_dcb);	
         
@@ -2000,30 +2012,43 @@ static int routeQuery(
 	
 	if (!succp && TARGET_IS_MASTER(route_target))
 	{
-		if (master_dcb == NULL)
+		DCB* curr_master_dcb = NULL;
+		
+		succp = get_dcb(&curr_master_dcb, 
+				router_cli_ses, 
+				BE_MASTER, 
+				NULL,
+				MAX_RLAG_UNDEFINED);
+
+		if (succp && (master_dcb == NULL || master_dcb == curr_master_dcb))
 		{
-			succp = get_dcb(&master_dcb, 
+			atomic_add(&inst->stats.n_master, 1);
-					router_cli_ses, 
+			target_dcb = master_dcb;
-					BE_MASTER, 
+		}
-					NULL,
+		else
-					MAX_RLAG_UNDEFINED);
+		{			
-			if (!succp)
+			if (succp && master_dcb != curr_master_dcb)
 			{
 				LOGIF(LT, (skygw_log_write(LOGFILE_TRACE,
 							   "Was supposed to "
 							   "route to master "
-							   "but couldn't find "
+							   "but master has "
-							   "master in a "
+							   "changed.")));
-							   "suitable state "
-							   "failed.")));
 			}
+			else
+			{
+				LOGIF(LT, (skygw_log_write(LOGFILE_TRACE,
+							"Was supposed to "
+							"route to master "
+							"but couldn't find "
+							"master in a "
+							"suitable state "
+							"failed.")));
+			}
+			succp = false;
+			ret = 0;
 		}
-		else
+			
-		{
-			succp = true;
-		}
-		atomic_add(&inst->stats.n_master, 1);
-		target_dcb = master_dcb;
 	}	
 	
 	if (succp) /*< Have DCB of the target backend */
@@ -2610,11 +2635,16 @@ static bool select_connect_backend_servers(
                 
                 master_found     = true;
                 master_connected = true;
-		/* assert with master_host */
+	
+		/**
+		 * Ensure that *p_master_ref and master_host point to same backend
+		 * and it has a master role.
+		 */
                 ss_dassert(master_host && 
 			((*p_master_ref)->bref_backend->backend_server == 
 				master_host->backend_server) && 
-			SERVER_MASTER);
+				(master_host->backend_server->status & 
+				(SERVER_MASTER|SERVER_MAINT)) == SERVER_MASTER);
         }
         /** New session or master failure case */
         else