Performance improvements to test if WSREP if active

sql/sql_parse.cc

@@ -1291,7 +1291,7 @@ bool do_command(THD *thd)
     Aborted by background rollbacker thread.
     Handle error here and jump straight to out
   */
-  if (wsrep_before_command(thd))
+  if (unlikely(wsrep_service_started) && wsrep_before_command(thd))
   {
     thd->store_globals();
     WSREP_LOG_THD(thd, "enter found BF aborted");
@@ -1368,6 +1368,7 @@ bool do_command(THD *thd)
   if (packet_length != packet_error)
   {
     /* there was a command to process, and before_command() has been called */
+    if (unlikely(wsrep_service_started))
       wsrep_after_command_after_result(thd);
   }
 #endif /* WITH_WSREP */
@@ -1659,14 +1660,20 @@ bool dispatch_command(enum enum_server_command command, THD *thd,
   {
     thd->status_var.com_other++;
 #ifdef WITH_WSREP
+    if (unlikely(wsrep_service_started))
+    {
       wsrep_after_command_ignore_result(thd);
       wsrep_close(thd);
+    }
 #endif /* WITH_WSREP */
     thd->change_user();
     thd->clear_error();                         // if errors from rollback
 #ifdef WITH_WSREP
+    if (unlikely(wsrep_service_started))
+    {
       wsrep_open(thd);
       wsrep_before_command(thd);
+    }
 #endif /* WITH_WSREP */
     /* Restore original charset from client authentication packet.*/
     if(thd->org_charset)
@@ -1680,13 +1687,19 @@ bool dispatch_command(enum enum_server_command command, THD *thd,
     status_var_increment(thd->status_var.com_other);
 
 #ifdef WITH_WSREP
+    if (unlikely(wsrep_service_started))
+    {
       wsrep_after_command_ignore_result(thd);
       wsrep_close(thd);
+    }
 #endif /* WITH_WSREP */
     thd->change_user();
 #ifdef WITH_WSREP
+    if (unlikely(wsrep_service_started))
+    {
       wsrep_open(thd);
       wsrep_before_command(thd);
+    }
 #endif /* WITH_WSREP */
     thd->clear_error();                         // if errors from rollback
 
@@ -2376,7 +2389,14 @@ bool dispatch_command(enum enum_server_command command, THD *thd,
   }
 
 dispatch_end:
+  do_end_of_statement= true;
 #ifdef WITH_WSREP
+  /*
+    Next test should really be WSREP(thd), but that causes a failure when doing
+    'set WSREP_ON=0'
+  */
+  if (unlikely(wsrep_service_started))
+  {
     /*
       BF aborted before sending response back to client
     */
@@ -2411,11 +2431,10 @@ bool dispatch_command(enum enum_server_command command, THD *thd,
       do_end_of_statement= thd_is_connection_alive(thd);
       mysql_mutex_unlock(&thd->LOCK_thd_kill);
     }
-  else
-    do_end_of_statement= true;
-
+  }
 #endif /* WITH_WSREP */
 
+
   if (do_end_of_statement)
   {
     DBUG_ASSERT(thd->derived_tables == NULL &&

sql/wsrep_mysqld.cc

@@ -99,6 +99,7 @@ my_bool wsrep_desync;                           // De(re)synchronize the node fr
 my_bool wsrep_strict_ddl;                       // Reject DDL to
                                                 // effected tables not
                                                 // supporting Galera replication
+bool wsrep_service_started;                     // If Galera was initialized
 long wsrep_slave_threads;                       // No. of slave appliers threads
 ulong wsrep_retry_autocommit;                   // Retry aborted autocommit trx
 ulong wsrep_max_ws_size;                        // Max allowed ws (RBR buffer) size
@@ -831,10 +832,6 @@ int wsrep_init()
     return err;
   }
 
-  global_system_variables.wsrep_on= 1;
-
-  WSREP_ON_= wsrep_provider && strcmp(wsrep_provider, WSREP_NONE);
-
   if (wsrep_gtid_mode && opt_bin_log && !opt_log_slave_updates)
   {
     WSREP_ERROR("Option --log-slave-updates is required if "
@@ -866,6 +863,11 @@ int wsrep_init()
     return 1;
   }
 
+  /* Now WSREP is fully initialized */
+  global_system_variables.wsrep_on= 1;
+  WSREP_ON_= wsrep_provider && strcmp(wsrep_provider, WSREP_NONE);
+  wsrep_service_started= 1;
+
   wsrep_init_provider_status_variables();
   wsrep_capabilities_export(Wsrep_server_state::instance().provider().capabilities(),
                             &wsrep_provider_capabilities);
@@ -1162,7 +1164,9 @@ bool wsrep_start_replication()
 
 bool wsrep_must_sync_wait (THD* thd, uint mask)
 {
-  bool ret;
+  bool ret= 0;
+  if (thd->variables.wsrep_on)
+  {
     mysql_mutex_lock(&thd->LOCK_thd_data);
     ret= (thd->variables.wsrep_sync_wait & mask) &&
       thd->wsrep_client_thread &&
@@ -1174,6 +1178,7 @@ bool wsrep_must_sync_wait (THD* thd, uint mask)
       wsrep::transaction::s_replaying &&
       thd->wsrep_cs().sync_wait_gtid().is_undefined();
     mysql_mutex_unlock(&thd->LOCK_thd_data);
+  }
   return ret;
 }
 

sql/wsrep_mysqld.h

@@ -186,6 +186,7 @@ void wsrep_recover_sr_from_storage(THD *);
 
 // Other wsrep global variables
 extern my_bool     wsrep_inited; // whether wsrep is initialized ?
+extern bool        wsrep_service_started;
 
 extern "C" void wsrep_fire_rollbacker(THD *thd);
 extern "C" uint32 wsrep_thd_wsrep_rand(THD *thd);