1 files changed, 25 insertions, 34 deletions

diff --git a/sql/wsrep_var.cc b/sql/wsrep_var.cc
index d4af7a95..c55d713e 100644
--- a/sql/wsrep_var.cc
+++ b/sql/wsrep_var.cc
@@ -27,6 +27,7 @@
 #include <cstdlib>
 #include "wsrep_trans_observer.h"
 #include "wsrep_server_state.h"
+#include "wsrep_plugin.h" /* wsrep_provider_plugin_is_enabled() */
 
 ulong   wsrep_reject_queries;
 
@@ -93,12 +94,17 @@ static bool refresh_provider_options()
   }
 }
 
+bool wsrep_refresh_provider_options()
+{
+  return refresh_provider_options();
+}
+
 void wsrep_set_wsrep_on(THD* thd)
 {
   if (thd)
     thd->wsrep_was_on= WSREP_ON_;
-  WSREP_PROVIDER_EXISTS_= wsrep_provider &&
-    strncasecmp(wsrep_provider, WSREP_NONE, FN_REFLEN);
+  WSREP_PROVIDER_EXISTS_= wsrep_provider && *wsrep_provider &&
+    strcasecmp(wsrep_provider, WSREP_NONE);
   WSREP_ON_= global_system_variables.wsrep_on && WSREP_PROVIDER_EXISTS_;
 }
 
@@ -108,10 +114,14 @@ bool wsrep_on_update (sys_var *self, THD* thd, enum_var_type var_type)
   {
     my_bool saved_wsrep_on= global_system_variables.wsrep_on;
 
-    thd->variables.wsrep_on= global_system_variables.wsrep_on;
+    thd->variables.wsrep_on= saved_wsrep_on;
 
     // If wsrep has not been inited we need to do it now
-    if (global_system_variables.wsrep_on && wsrep_provider && !wsrep_inited)
+    if (!wsrep_inited &&
+        saved_wsrep_on &&
+        wsrep_provider &&
+        *wsrep_provider &&
+        strcasecmp(wsrep_provider, WSREP_NONE))
     {
       // wsrep_init() rewrites provide if it fails
       char* tmp= strdup(wsrep_provider);
@@ -198,36 +208,6 @@ bool wsrep_on_check(sys_var *self, THD* thd, set_var* var)
   return false;
 }
 
-bool wsrep_causal_reads_update (sys_var *self, THD* thd, enum_var_type var_type)
-{
-  if (thd->variables.wsrep_causal_reads) {
-    thd->variables.wsrep_sync_wait |= WSREP_SYNC_WAIT_BEFORE_READ;
-  } else {
-    thd->variables.wsrep_sync_wait &= ~WSREP_SYNC_WAIT_BEFORE_READ;
-  }
-
-  // update global settings too.
-  if (global_system_variables.wsrep_causal_reads) {
-      global_system_variables.wsrep_sync_wait |= WSREP_SYNC_WAIT_BEFORE_READ;
-  } else {
-      global_system_variables.wsrep_sync_wait &= ~WSREP_SYNC_WAIT_BEFORE_READ;
-  }
-
-  return false;
-}
-
-bool wsrep_sync_wait_update (sys_var* self, THD* thd, enum_var_type var_type)
-{
-  thd->variables.wsrep_causal_reads= thd->variables.wsrep_sync_wait &
-          WSREP_SYNC_WAIT_BEFORE_READ;
-
-  // update global settings too
-  global_system_variables.wsrep_causal_reads= global_system_variables.wsrep_sync_wait &
-          WSREP_SYNC_WAIT_BEFORE_READ;
-
-  return false;
-}
-
 template<typename T>
 static T parse_value(char** startptr, char** endptr)
 {
@@ -447,6 +427,12 @@ static int wsrep_provider_verify (const char* provider_str)
 
 bool wsrep_provider_check (sys_var *self, THD* thd, set_var* var)
 {
+  if (wsrep_provider_plugin_enabled())
+  {
+    my_error(ER_INCORRECT_GLOBAL_LOCAL_VAR, MYF(0), var->var->name.str, "read only");
+    return true;
+  }
+
   char wsrep_provider_buf[FN_REFLEN];
 
   if ((! var->save_result.string_value.str) ||
@@ -538,6 +524,11 @@ bool wsrep_provider_options_check(sys_var *self, THD* thd, set_var* var)
     my_message(ER_WRONG_ARGUMENTS, "WSREP (galera) not started", MYF(0));
     return true;
   }
+  if (wsrep_provider_plugin_enabled())
+  {
+    my_error(ER_INCORRECT_GLOBAL_LOCAL_VAR, MYF(0), var->var->name.str, "read only");
+    return true;
+  }
   return false;
 }