diff --git a/storage/spider/spd_db_mysql.cc b/storage/spider/spd_db_mysql.cc
index 0510e537210..f1bf402fe71 100644
--- a/storage/spider/spd_db_mysql.cc
+++ b/storage/spider/spd_db_mysql.cc
@@ -109,6 +109,8 @@ static const char *name_quote_str = SPIDER_SQL_NAME_QUOTE_STR;
 #define SPIDER_SQL_SHOW_TABLE_STATUS_LEN sizeof(SPIDER_SQL_SHOW_TABLE_STATUS_STR) - 1
 #define SPIDER_SQL_SELECT_TABLES_STATUS_STR "select `table_rows`,`avg_row_length`,`data_length`,`max_data_length`,`index_length`,`auto_increment`,`create_time`,`update_time`,`check_time` from `information_schema`.`tables` where `table_schema` = "
 #define SPIDER_SQL_SELECT_TABLES_STATUS_LEN sizeof(SPIDER_SQL_SELECT_TABLES_STATUS_STR) - 1
+#define SPIDER_SQL_SHOW_WARNINGS_STR "show warnings"
+#define SPIDER_SQL_SHOW_WARNINGS_LEN sizeof(SPIDER_SQL_SHOW_WARNINGS_STR) - 1
 
 #ifdef SPIDER_HAS_DISCOVER_TABLE_STRUCTURE
 #define SPIDER_SQL_SHOW_COLUMNS_STR "show columns from "
@@ -1553,6 +1555,8 @@ int spider_db_mysql::exec_query(
       conn->tgt_host, db_conn->thread_id, current_thd->thread_id,
       db_conn->affected_rows, db_conn->insert_id,
       db_conn->server_status, db_conn->warning_count);
+    if (spider_param_log_result_errors() >= 3)
+      print_warnings(l_time);
   } else if (spider_param_log_result_errors() >= 4)
   {
     time_t cur_time = (time_t) time((time_t*) 0);
@@ -1633,6 +1637,78 @@ bool spider_db_mysql::is_xa_nota_error(
   DBUG_RETURN(xa_nota);
 }
 
+void spider_db_mysql::print_warnings(
+  struct tm *l_time
+) {
+  DBUG_ENTER("spider_db_mysql::print_warnings");
+  DBUG_PRINT("info",("spider this=%p", this));
+  if (db_conn->status == MYSQL_STATUS_READY)
+  {
+#if MYSQL_VERSION_ID < 50500
+    if (!(db_conn->last_used_con->server_status & SERVER_MORE_RESULTS_EXISTS))
+#else
+    if (!(db_conn->server_status & SERVER_MORE_RESULTS_EXISTS))
+#endif
+    {
+/*
+      pthread_mutex_lock(&conn->mta_conn_mutex);
+      SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
+*/
+      if (!mysql_real_query(db_conn, SPIDER_SQL_SHOW_WARNINGS_STR,
+        SPIDER_SQL_SHOW_WARNINGS_LEN))
+      {
+        MYSQL_RES *res;
+        MYSQL_ROW row = NULL;
+        uint num_fields;
+        if (
+          !(res = mysql_store_result(db_conn)) ||
+          !(row = mysql_fetch_row(res))
+        ) {
+          if (mysql_errno(db_conn))
+          {
+            if (res)
+              mysql_free_result(res);
+/*
+            SPIDER_CLEAR_FILE_POS(&conn->mta_conn_mutex_file_pos);
+            pthread_mutex_unlock(&conn->mta_conn_mutex);
+*/
+            DBUG_VOID_RETURN;
+          }
+          /* no record is ok */
+        }
+/*
+        SPIDER_CLEAR_FILE_POS(&conn->mta_conn_mutex_file_pos);
+        pthread_mutex_unlock(&conn->mta_conn_mutex);
+*/
+        num_fields = mysql_num_fields(res);
+        if (num_fields != 3)
+        {
+          mysql_free_result(res);
+          DBUG_VOID_RETURN;
+        }
+        while (row)
+        {
+          fprintf(stderr, "%04d%02d%02d %02d:%02d:%02d [WARN SPIDER RESULT] "
+            "from [%s] %ld to %ld: %s %s %s\n",
+            l_time->tm_year + 1900, l_time->tm_mon + 1, l_time->tm_mday,
+            l_time->tm_hour, l_time->tm_min, l_time->tm_sec,
+            conn->tgt_host, db_conn->thread_id,
+            current_thd->thread_id, row[0], row[1], row[2]);
+          row = mysql_fetch_row(res);
+        }
+        if (res)
+          mysql_free_result(res);
+      } else {
+/*
+        SPIDER_CLEAR_FILE_POS(&conn->mta_conn_mutex_file_pos);
+        pthread_mutex_unlock(&conn->mta_conn_mutex);
+*/
+      }
+    }
+  }
+  DBUG_VOID_RETURN;
+}
+
 spider_db_result *spider_db_mysql::store_result(
   spider_db_result_buffer **spider_res_buf,
   st_spider_db_request_key *request_key,
diff --git a/storage/spider/spd_db_mysql.h b/storage/spider/spd_db_mysql.h
index 07f8e265471..da1eeeb11c5 100644
--- a/storage/spider/spd_db_mysql.h
+++ b/storage/spider/spd_db_mysql.h
@@ -271,6 +271,9 @@ public:
   bool is_xa_nota_error(
     int error_num
   );
+  void print_warnings(
+    struct tm *l_time
+  );
   spider_db_result *store_result(
     spider_db_result_buffer **spider_res_buf,
     st_spider_db_request_key *request_key,
diff --git a/storage/spider/spd_err.h b/storage/spider/spd_err.h
index c644d6ebca5..e025a0156d3 100644
--- a/storage/spider/spd_err.h
+++ b/storage/spider/spd_err.h
@@ -61,6 +61,8 @@
 #define ER_SPIDER_NOSQL_WRAPPER_IS_INVALID_STR "Can't use wrapper '%s' for NOSQL connection"
 #define ER_SPIDER_REQUEST_KEY_NUM 12523
 #define ER_SPIDER_REQUEST_KEY_STR "Request key not found"
+#define ER_SPIDER_CANT_OPEN_SYS_TABLE_NUM 12524
+#define ER_SPIDER_CANT_OPEN_SYS_TABLE_STR "Can't open system table %s.%s"
 
 #define ER_SPIDER_CANT_USE_BOTH_INNER_XA_AND_SNAPSHOT_NUM 12601
 #define ER_SPIDER_CANT_USE_BOTH_INNER_XA_AND_SNAPSHOT_STR "Can't use both spider_use_consistent_snapshot = 1 and spider_internal_xa = 1"
diff --git a/storage/spider/spd_sys_table.cc b/storage/spider/spd_sys_table.cc
index 24fa5ff6faa..272546d0753 100644
--- a/storage/spider/spd_sys_table.cc
+++ b/storage/spider/spd_sys_table.cc
@@ -90,7 +90,10 @@ TABLE *spider_open_sys_table(
     if (!(table = spider_sys_open_table(thd, &tables, open_tables_backup)))
 #endif
     {
-      *error_num = my_errno;
+      my_printf_error(ER_SPIDER_CANT_OPEN_SYS_TABLE_NUM,
+        ER_SPIDER_CANT_OPEN_SYS_TABLE_STR, MYF(0),
+        "mysql", table_name);
+      *error_num = ER_SPIDER_CANT_OPEN_SYS_TABLE_NUM;
       DBUG_RETURN(NULL);
     }
 #if MYSQL_VERSION_ID < 50500
@@ -117,7 +120,10 @@ TABLE *spider_open_sys_table(
       table, FALSE)
     ) {
       release_table_share(table_share, RELEASE_NORMAL);
-      *error_num = my_errno;
+      my_printf_error(ER_SPIDER_CANT_OPEN_SYS_TABLE_NUM,
+        ER_SPIDER_CANT_OPEN_SYS_TABLE_STR, MYF(0),
+        "mysql", table_name);
+      *error_num = ER_SPIDER_CANT_OPEN_SYS_TABLE_NUM;
       goto error;
     }
   }
@@ -1913,7 +1919,6 @@ int spider_sys_update_tables_link_status(
       SPIDER_SYS_TABLES_TABLE_NAME_LEN, TRUE, &open_tables_backup, need_lock,
       &error_num))
   ) {
-    my_error(error_num, MYF(0));
     goto error;
   }
   if ((error_num = spider_update_tables_link_status(table_tables,
@@ -1952,7 +1957,6 @@ int spider_sys_log_tables_link_failed(
       SPIDER_SYS_LINK_FAILED_TABLE_NAME_LEN, TRUE, &open_tables_backup,
       need_lock, &error_num))
   ) {
-    my_error(error_num, MYF(0));
     goto error;
   }
   empty_record(table_tables);
@@ -1992,7 +1996,6 @@ int spider_sys_log_xa_failed(
       SPIDER_SYS_XA_FAILED_TABLE_NAME_LEN, TRUE, &open_tables_backup,
       need_lock, &error_num))
   ) {
-    my_error(error_num, MYF(0));
     goto error;
   }
   empty_record(table_tables);
diff --git a/storage/spider/spd_trx.cc b/storage/spider/spd_trx.cc
index 7dac85180fd..1af47d0e70b 100644
--- a/storage/spider/spd_trx.cc
+++ b/storage/spider/spd_trx.cc
@@ -1907,6 +1907,8 @@ int spider_internal_xa_commit(
   if ((conn = spider_tree_first(trx->join_trx_top)))
   {
     do {
+      if (conn->bg_search)
+        spider_bg_conn_break(conn, NULL);
       DBUG_PRINT("info",("spider conn=%p", conn));
       DBUG_PRINT("info",("spider conn->join_trx=%u", conn->join_trx));
       if (conn->join_trx)
@@ -2087,6 +2089,8 @@ int spider_internal_xa_rollback(
   if ((conn = spider_tree_first(trx->join_trx_top)))
   {
     do {
+      if (conn->bg_search)
+        spider_bg_conn_break(conn, NULL);
       if (conn->join_trx)
       {
         if (conn->disable_xa)
@@ -2271,6 +2275,8 @@ int spider_internal_xa_prepare(
   if ((conn = spider_tree_first(trx->join_trx_top)))
   {
     do {
+      if (conn->bg_search)
+        spider_bg_conn_break(conn, NULL);
       if (conn->disable_xa)
       {
         if (conn->table_lock != 3)