MDEV-23483: Set Galera SST thd as system threadbb-10.2-MDEV-23483

Revert change to MDL and set SST donor thread as a system thread.
Joiner thread was already a system thread.

1 files changed, 8 insertions, 17 deletions

diff --git a/sql/mdl.cc b/sql/mdl.cc
index 14a1f17fe86..9eeb82eeffd 100644
--- a/sql/mdl.cc
+++ b/sql/mdl.cc
@@ -25,7 +25,6 @@
 #include <mysql/psi/mysql_stage.h>
 #include "wsrep_mysqld.h"
 #include "wsrep_thd.h"
-#include "wsrep_sst.h"
 
 #ifdef HAVE_PSI_INTERFACE
 static PSI_mutex_key key_MDL_wait_LOCK_wait_status;
@@ -2138,26 +2137,18 @@ MDL_context::acquire_lock(MDL_request *mdl_request, double lock_wait_timeout)
     wait_status= m_wait.timed_wait(m_owner, &abs_shortwait, FALSE,
                                    mdl_request->key.get_wait_state_name());
 
-    THD* thd= m_owner->get_thd();
-
     if (wait_status != MDL_wait::EMPTY)
       break;
     /* Check if the client is gone while we were waiting. */
-    if (! thd_is_connected(thd))
+    if (! thd_is_connected(m_owner->get_thd()))
     {
-#if defined(WITH_WSREP) && !defined(EMBEDDED_LIBRARY)
-      // During SST client might not be connected
-      if (!wsrep_is_sst_progress())
-#endif
-      {
-        /*
-         * The client is disconnected. Don't wait forever:
-         * assume it's the same as a wait timeout, this
-         * ensures all error handling is correct.
-         */
-        wait_status= MDL_wait::TIMEOUT;
-        break;
-      }
+      /*
+       * The client is disconnected. Don't wait forever:
+       * assume it's the same as a wait timeout, this
+       * ensures all error handling is correct.
+       */
+      wait_status= MDL_wait::TIMEOUT;
+      break;
     }
 
     mysql_prlock_wrlock(&lock->m_rwlock);