@@ -206,11 +206,19 @@ extern Binlog_relay_IO_delegate *binlog_relay_io_delegate;
 #endif /* HAVE_REPLICATION */

 /*
-  if there is no observers in the delegate, we can return 0
-  immediately.
+  if semisync replication is not enabled, we can return immediately.
 */
-#define RUN_HOOK(group, hook, args)             \
-  (group ##_delegate->is_empty() ?              \
-   0 : group ##_delegate->hook args)
+#ifdef HAVE_REPLICATION
+/*
+  As semisync is unpluggined and its hooks are turned into static
+  invocations all other hooks are not run for optimization sake.
+  Todo: introduce a server flag to allow the plugins' hooks to run
+  along with "static" semisync ones.
+*/
+#define RUN_HOOK(group, hook, args)   \
+  (unlikely(run_hooks_enabled) ? group ##_delegate->hook args : 0)
+#else
+#define RUN_HOOK(group, hook, args) 0
+#endif /* HAVE_REPLICATION */

 #endif /* RPL_HANDLER_H */

@@ -8807,6 +8872,7 @@ static int mysql_init_variables(void)
   report_user= report_password = report_host= 0;	/* TO BE DELETED */
   opt_relay_logname= opt_relaylog_index_name= 0;
   slave_retried_transactions= 0;
+  run_hooks_enabled= 1; // "dynamic" hooks run by default unlike "static" semisync
   log_bin_basename= NULL;
   log_bin_index= NULL;


// SET @@global.rpl_semi_sync_master_enabled = ON
@@ -388,6 +409,7 @@ int ReplSemiSyncMaster::enableMaster()

       set_master_enabled(true);
       state_ = true;
+      run_hooks_enabled= 0; // plugin "dynamic" hooks not to run when semisync ON
       sql_print_information("Semi-sync replication enabled on the master.");
     }
     else

@@ -44,54 +48,72 @@ class ReplSemiSyncSlave
     return slave_enabled_;
   }
   void setSlaveEnabled(bool enabled) {
+    run_hooks_enabled= !enabled;  // plugin "dynamic" hooks not to run when semisync ON
     slave_enabled_ = enabled;
   }