diff --git a/mysql-test/suite/galera/disabled.def b/mysql-test/suite/galera/disabled.def
index 4aa15d27661..5f8d9c6ddff 100644
--- a/mysql-test/suite/galera/disabled.def
+++ b/mysql-test/suite/galera/disabled.def
@@ -28,4 +28,5 @@ galera_flush : mysql-wsrep/issues/229
 galera_transaction_read_only : mysql-wsrep/issues/229
 galera_gcs_fragment : Incorrect arguments to SET
 galera_flush_local : Fails sporadically
-galera_binlog_stmt_autoinc : TODO: investigate
\ No newline at end of file
+galera_binlog_stmt_autoinc : TODO: investigate
+galera_concurrent_ctas : Test times out, investigate
diff --git a/mysql-test/suite/galera/r/galera_roles.result b/mysql-test/suite/galera/r/galera_roles.result
index d8c13758797..6312250c18d 100644
--- a/mysql-test/suite/galera/r/galera_roles.result
+++ b/mysql-test/suite/galera/r/galera_roles.result
@@ -170,10 +170,10 @@ localhost	foo	role3	Y
 localhost	root	role1	Y
 localhost	root	role2	Y
 SELECT * FROM INFORMATION_SCHEMA.APPLICABLE_ROLES;
-GRANTEE	ROLE_NAME	IS_GRANTABLE
-role1	role4	YES
-root@localhost	role1	YES
-root@localhost	role2	YES
+GRANTEE	ROLE_NAME	IS_GRANTABLE	IS_DEFAULT
+role1	role4	YES	NULL
+root@localhost	role1	YES	NO
+root@localhost	role2	YES	NO
 
 # On node_2
 SELECT * FROM mysql.roles_mapping;
@@ -183,10 +183,10 @@ localhost	foo	role3	Y
 localhost	root	role1	Y
 localhost	root	role2	Y
 SELECT * FROM INFORMATION_SCHEMA.APPLICABLE_ROLES;
-GRANTEE	ROLE_NAME	IS_GRANTABLE
-role1	role4	YES
-root@localhost	role1	YES
-root@localhost	role2	YES
+GRANTEE	ROLE_NAME	IS_GRANTABLE	IS_DEFAULT
+role1	role4	YES	NULL
+root@localhost	role1	YES	NO
+root@localhost	role2	YES	NO
 DROP ROLE role1;
 DROP ROLE role2;
 DROP ROLE role3;
diff --git a/mysql-test/suite/galera/t/MW-259.test b/mysql-test/suite/galera/t/MW-259.test
index ff9a30deed3..7298285f6ff 100644
--- a/mysql-test/suite/galera/t/MW-259.test
+++ b/mysql-test/suite/galera/t/MW-259.test
@@ -24,7 +24,7 @@ SET DEBUG_SYNC = 'alter_table_before_open_tables WAIT_FOR continue';
 
 --connection node_1b
 --sleep 2
---let $wait_condition = SELECT COUNT(*) = 1 FROM INFORMATION_SCHEMA.PROCESSLIST WHERE STATE = 'exit open_tables()' and INFO = 'SET GLOBAL wsrep_desync=1'
+--let $wait_condition = SELECT COUNT(*) = 1 FROM INFORMATION_SCHEMA.PROCESSLIST WHERE INFO = 'SET GLOBAL wsrep_desync=1'
 --source include/wait_condition.inc
 
 SET DEBUG_SYNC= 'now SIGNAL continue';
diff --git a/mysql-test/suite/galera/t/galera_rsu_wsrep_desync.test b/mysql-test/suite/galera/t/galera_rsu_wsrep_desync.test
index dc7ff11a9f5..882f846fe67 100644
--- a/mysql-test/suite/galera/t/galera_rsu_wsrep_desync.test
+++ b/mysql-test/suite/galera/t/galera_rsu_wsrep_desync.test
@@ -60,7 +60,7 @@ SET DEBUG_SYNC = 'alter_table_before_create_table_no_lock WAIT_FOR continue';
 
 --connection node_1b
 --sleep 2
---let $wait_condition = SELECT COUNT(*) = 1 FROM INFORMATION_SCHEMA.PROCESSLIST WHERE STATE = 'exit open_tables()' and INFO = 'SET GLOBAL wsrep_desync=1'
+--let $wait_condition = SELECT COUNT(*) = 1 FROM INFORMATION_SCHEMA.PROCESSLIST WHERE INFO = 'SET GLOBAL wsrep_desync=1'
 --source include/wait_condition.inc
 
 SET DEBUG_SYNC= 'now SIGNAL continue';
diff --git a/mysql-test/suite/sys_vars/r/sysvars_wsrep.result b/mysql-test/suite/sys_vars/r/sysvars_wsrep.result
index 3d7ec08166d..36d04afb80d 100644
--- a/mysql-test/suite/sys_vars/r/sysvars_wsrep.result
+++ b/mysql-test/suite/sys_vars/r/sysvars_wsrep.result
@@ -241,13 +241,13 @@ READ_ONLY	NO
 COMMAND_LINE_ARGUMENT	OPTIONAL
 VARIABLE_NAME	WSREP_MAX_WS_ROWS
 SESSION_VALUE	NULL
-GLOBAL_VALUE	131072
+GLOBAL_VALUE	0
 GLOBAL_VALUE_ORIGIN	COMPILE-TIME
-DEFAULT_VALUE	131072
+DEFAULT_VALUE	0
 VARIABLE_SCOPE	GLOBAL
 VARIABLE_TYPE	BIGINT UNSIGNED
 VARIABLE_COMMENT	Max number of rows in write set
-NUMERIC_MIN_VALUE	1
+NUMERIC_MIN_VALUE	0
 NUMERIC_MAX_VALUE	1048576
 NUMERIC_BLOCK_SIZE	1
 ENUM_VALUE_LIST	NULL
@@ -255,14 +255,14 @@ READ_ONLY	NO
 COMMAND_LINE_ARGUMENT	REQUIRED
 VARIABLE_NAME	WSREP_MAX_WS_SIZE
 SESSION_VALUE	NULL
-GLOBAL_VALUE	1073741824
+GLOBAL_VALUE	2147483647
 GLOBAL_VALUE_ORIGIN	COMPILE-TIME
-DEFAULT_VALUE	1073741824
+DEFAULT_VALUE	2147483647
 VARIABLE_SCOPE	GLOBAL
 VARIABLE_TYPE	BIGINT UNSIGNED
 VARIABLE_COMMENT	Max write set size (bytes)
 NUMERIC_MIN_VALUE	1024
-NUMERIC_MAX_VALUE	4294901759
+NUMERIC_MAX_VALUE	2147483647
 NUMERIC_BLOCK_SIZE	1
 ENUM_VALUE_LIST	NULL
 READ_ONLY	NO
@@ -367,7 +367,7 @@ READ_ONLY	NO
 COMMAND_LINE_ARGUMENT	OPTIONAL
 VARIABLE_NAME	WSREP_PATCH_VERSION
 SESSION_VALUE	NULL
-GLOBAL_VALUE	wsrep_25.13
+GLOBAL_VALUE	wsrep_25.16
 GLOBAL_VALUE_ORIGIN	COMPILE-TIME
 DEFAULT_VALUE	NULL
 VARIABLE_SCOPE	GLOBAL
diff --git a/mysql-test/suite/sys_vars/r/wsrep_desync_basic.result b/mysql-test/suite/sys_vars/r/wsrep_desync_basic.result
index e4d452c11b5..90925e71c32 100644
--- a/mysql-test/suite/sys_vars/r/wsrep_desync_basic.result
+++ b/mysql-test/suite/sys_vars/r/wsrep_desync_basic.result
@@ -24,8 +24,6 @@ SELECT @@global.wsrep_desync;
 
 # valid values
 SET @@global.wsrep_desync='OFF';
-Warnings:
-Warning	1231	'wsrep_desync' is already OFF.
 SELECT @@global.wsrep_desync;
 @@global.wsrep_desync
 0
@@ -35,8 +33,6 @@ SELECT @@global.wsrep_desync;
 @@global.wsrep_desync
 0
 SET @@global.wsrep_desync=default;
-Warnings:
-Warning	1231	'wsrep_desync' is already OFF.
 SELECT @@global.wsrep_desync;
 @@global.wsrep_desync
 0
diff --git a/mysql-test/suite/sys_vars/r/wsrep_max_ws_size_basic.result b/mysql-test/suite/sys_vars/r/wsrep_max_ws_size_basic.result
index d7e72869be3..689da3e9cb0 100644
--- a/mysql-test/suite/sys_vars/r/wsrep_max_ws_size_basic.result
+++ b/mysql-test/suite/sys_vars/r/wsrep_max_ws_size_basic.result
@@ -1,9 +1,6 @@
 #
 # wsrep_max_ws_size
 #
-# save the initial value
-SET @wsrep_max_ws_size_global_saved = @@global.wsrep_max_ws_size;
-SET @wsrep_provider_options_saved = @@global.wsrep_provider_options;
 # default
 SELECT @@global.wsrep_max_ws_size;
 @@global.wsrep_max_ws_size
@@ -13,28 +10,29 @@ SELECT @@global.wsrep_max_ws_size;
 SELECT @@session.wsrep_max_ws_size;
 ERROR HY000: Variable 'wsrep_max_ws_size' is a GLOBAL variable
 SET @@global.wsrep_max_ws_size=1;
-Warnings:
-Warning	1292	Truncated incorrect wsrep_max_ws_size value: '1'
+ERROR HY000: WSREP (galera) not started
 SELECT @@global.wsrep_max_ws_size;
 @@global.wsrep_max_ws_size
-1024
+2147483647
 
 # valid values
 SET @@global.wsrep_max_ws_size=1073741824;
+ERROR HY000: WSREP (galera) not started
 SELECT @@global.wsrep_max_ws_size;
 @@global.wsrep_max_ws_size
-1073741824
+2147483647
 SET @@global.wsrep_max_ws_size=1073741825;
+ERROR HY000: WSREP (galera) not started
 SELECT @@global.wsrep_max_ws_size;
 @@global.wsrep_max_ws_size
-1073741825
+2147483647
 SET @@global.wsrep_max_ws_size=0;
-Warnings:
-Warning	1292	Truncated incorrect wsrep_max_ws_size value: '0'
+ERROR HY000: WSREP (galera) not started
 SELECT @@global.wsrep_max_ws_size;
 @@global.wsrep_max_ws_size
-1024
+2147483647
 SET @@global.wsrep_max_ws_size=default;
+ERROR HY000: WSREP (galera) not started
 SELECT @global.wsrep_max_ws_size;
 @global.wsrep_max_ws_size
 NULL
@@ -48,13 +46,8 @@ SELECT @global.wsrep_max_ws_size;
 @global.wsrep_max_ws_size
 NULL
 SET @@global.wsrep_max_ws_size=-1;
-Warnings:
-Warning	1292	Truncated incorrect wsrep_max_ws_size value: '-1'
+ERROR HY000: WSREP (galera) not started
 SELECT @global.wsrep_max_ws_size;
 @global.wsrep_max_ws_size
 NULL
-
-# restore the initial value
-SET @@global.wsrep_max_ws_size = @wsrep_max_ws_size_global_saved;
-SET @@global.wsrep_provider_options = @wsrep_provider_options_saved;
 # End of test
diff --git a/mysql-test/suite/sys_vars/t/wsrep_max_ws_size_basic.test b/mysql-test/suite/sys_vars/t/wsrep_max_ws_size_basic.test
index 2e302015136..50506ed12df 100644
--- a/mysql-test/suite/sys_vars/t/wsrep_max_ws_size_basic.test
+++ b/mysql-test/suite/sys_vars/t/wsrep_max_ws_size_basic.test
@@ -4,10 +4,6 @@
 --echo # wsrep_max_ws_size
 --echo #
 
---echo # save the initial value
-SET @wsrep_max_ws_size_global_saved = @@global.wsrep_max_ws_size;
-SET @wsrep_provider_options_saved = @@global.wsrep_provider_options;
-
 --echo # default
 SELECT @@global.wsrep_max_ws_size;
 
@@ -15,17 +11,22 @@ SELECT @@global.wsrep_max_ws_size;
 --echo # scope
 --error ER_INCORRECT_GLOBAL_LOCAL_VAR
 SELECT @@session.wsrep_max_ws_size;
+--error ER_WRONG_ARGUMENTS
 SET @@global.wsrep_max_ws_size=1;
 SELECT @@global.wsrep_max_ws_size;
 
 --echo
 --echo # valid values
+--error ER_WRONG_ARGUMENTS
 SET @@global.wsrep_max_ws_size=1073741824;
 SELECT @@global.wsrep_max_ws_size;
+--error ER_WRONG_ARGUMENTS
 SET @@global.wsrep_max_ws_size=1073741825;
 SELECT @@global.wsrep_max_ws_size;
+--error ER_WRONG_ARGUMENTS
 SET @@global.wsrep_max_ws_size=0;
 SELECT @@global.wsrep_max_ws_size;
+--error ER_WRONG_ARGUMENTS
 SET @@global.wsrep_max_ws_size=default;
 SELECT @global.wsrep_max_ws_size;
 
@@ -36,12 +37,8 @@ SET @@global.wsrep_max_ws_size=NULL;
 --error ER_WRONG_TYPE_FOR_VAR
 SET @@global.wsrep_max_ws_size='junk';
 SELECT @global.wsrep_max_ws_size;
+--error ER_WRONG_ARGUMENTS
 SET @@global.wsrep_max_ws_size=-1;
 SELECT @global.wsrep_max_ws_size;
 
---echo
---echo # restore the initial value
-SET @@global.wsrep_max_ws_size = @wsrep_max_ws_size_global_saved;
-SET @@global.wsrep_provider_options = @wsrep_provider_options_saved;
-
 --echo # End of test
diff --git a/mysql-test/suite/wsrep/r/variables.result b/mysql-test/suite/wsrep/r/variables.result
index 928f1995072..62d7f62440f 100644
--- a/mysql-test/suite/wsrep/r/variables.result
+++ b/mysql-test/suite/wsrep/r/variables.result
@@ -36,7 +36,6 @@ wsrep_commit_oooe	#
 wsrep_commit_oool	#
 wsrep_commit_window	#
 wsrep_connected	#
-wsrep_debug_sync_waiters	#
 wsrep_flow_control_paused	#
 wsrep_flow_control_paused_ns	#
 wsrep_flow_control_recv	#
@@ -92,7 +91,6 @@ wsrep_commit_oooe	#
 wsrep_commit_oool	#
 wsrep_commit_window	#
 wsrep_connected	#
-wsrep_debug_sync_waiters	#
 wsrep_flow_control_paused	#
 wsrep_flow_control_paused_ns	#
 wsrep_flow_control_recv	#
diff --git a/sql/sys_vars.cc b/sql/sys_vars.cc
index 9ad70514852..306528c5c86 100644
--- a/sql/sys_vars.cc
+++ b/sql/sys_vars.cc
@@ -4865,8 +4865,8 @@ static Sys_var_ulong Sys_wsrep_max_ws_size (
        "wsrep_max_ws_size", "Max write set size (bytes)",
        GLOBAL_VAR(wsrep_max_ws_size), CMD_LINE(REQUIRED_ARG),
        VALID_RANGE(1024, WSREP_MAX_WS_SIZE), DEFAULT(WSREP_MAX_WS_SIZE),
-       BLOCK_SIZE(1), NO_MUTEX_GUARD, NOT_IN_BINLOG, ON_CHECK(0),
-       ON_UPDATE(wsrep_max_ws_size_update));
+       BLOCK_SIZE(1), NO_MUTEX_GUARD, NOT_IN_BINLOG,
+       ON_CHECK(wsrep_max_ws_size_check), ON_UPDATE(wsrep_max_ws_size_update));
 
 static Sys_var_ulong Sys_wsrep_max_ws_rows (
        "wsrep_max_ws_rows", "Max number of rows in write set",
diff --git a/sql/wsrep_mysqld.h b/sql/wsrep_mysqld.h
index 296ff26962d..04ccc1a7e45 100644
--- a/sql/wsrep_mysqld.h
+++ b/sql/wsrep_mysqld.h
@@ -170,6 +170,9 @@ extern void wsrep_prepend_PATH (const char* path);
 extern wsrep_seqno_t wsrep_locked_seqno;
 
 #define WSREP_ON                         \
+  (global_system_variables.wsrep_on)
+
+#define WSREP_ON_NEW                     \
   ((global_system_variables.wsrep_on) && \
    wsrep_provider                     && \
    strcmp(wsrep_provider, WSREP_NONE))
diff --git a/sql/wsrep_var.cc b/sql/wsrep_var.cc
index 56a799c97c1..30c5bf900ff 100644
--- a/sql/wsrep_var.cc
+++ b/sql/wsrep_var.cc
@@ -195,6 +195,8 @@ end:
 
 static bool refresh_provider_options()
 {
+  DBUG_ASSERT(wsrep);
+
   WSREP_DEBUG("refresh_provider_options: %s", 
               (wsrep_provider_options) ? wsrep_provider_options : "null");
   char* opts= wsrep->options_get(wsrep);
@@ -318,18 +320,18 @@ void wsrep_provider_init (const char* value)
 }
 
 bool wsrep_provider_options_check(sys_var *self, THD* thd, set_var* var)
-{
-  return 0;
-}
-
-bool wsrep_provider_options_update(sys_var *self, THD* thd, enum_var_type type)
 {
   if (wsrep == NULL)
   {
     my_message(ER_WRONG_ARGUMENTS, "WSREP (galera) not started", MYF(0));
     return true;
   }
+  return false;
+}
 
+bool wsrep_provider_options_update(sys_var *self, THD* thd, enum_var_type type)
+{
+  DBUG_ASSERT(wsrep);
   wsrep_status_t ret= wsrep->options_set(wsrep, wsrep_provider_options);
   if (ret != WSREP_OK)
   {
@@ -522,6 +524,12 @@ bool wsrep_slave_threads_update (sys_var *self, THD* thd, enum_var_type type)
 
 bool wsrep_desync_check (sys_var *self, THD* thd, set_var* var)
 {
+  if (wsrep == NULL)
+  {
+    my_message(ER_WRONG_ARGUMENTS, "WSREP (galera) not started", MYF(0));
+    return true;
+  }
+
   bool new_wsrep_desync= (bool) var->save_result.ulonglong_value;
   if (wsrep_desync == new_wsrep_desync) {
     if (new_wsrep_desync) {
@@ -559,6 +567,12 @@ bool wsrep_desync_check (sys_var *self, THD* thd, set_var* var)
 }
 
 bool wsrep_desync_update (sys_var *self, THD* thd, enum_var_type type)
+{
+  DBUG_ASSERT(wsrep);
+  return false;
+}
+
+bool wsrep_max_ws_size_check(sys_var *self, THD* thd, set_var* var)
 {
   if (wsrep == NULL)
   {
@@ -570,6 +584,8 @@ bool wsrep_desync_update (sys_var *self, THD* thd, enum_var_type type)
 
 bool wsrep_max_ws_size_update (sys_var *self, THD *thd, enum_var_type)
 {
+  DBUG_ASSERT(wsrep);
+
   char max_ws_size_opt[128];
   my_snprintf(max_ws_size_opt, sizeof(max_ws_size_opt),
               "repl.max_ws_size=%d", wsrep_max_ws_size);
diff --git a/sql/wsrep_var.h b/sql/wsrep_var.h
index 66b9a736b38..ca77b5c0039 100644
--- a/sql/wsrep_var.h
+++ b/sql/wsrep_var.h
@@ -92,7 +92,9 @@ extern bool wsrep_slave_threads_update       UPDATE_ARGS;
 extern bool wsrep_desync_check               CHECK_ARGS;
 extern bool wsrep_desync_update              UPDATE_ARGS;
 
+extern bool wsrep_max_ws_size_check          CHECK_ARGS;
 extern bool wsrep_max_ws_size_update         UPDATE_ARGS;
+
 #else  /* WITH_WSREP */
 
 #define WSREP_NONE