MDEV-26: Global transaction ID.

Fix initial loading of mysql.rpl_slave_state, the code had several
issues.

Some very basic MTR stuff, more to come.

mysql-test/include/check-testcase.test

@@ -60,6 +60,7 @@ if ($tmp)
   --echo Last_SQL_Error	
   --echo Replicate_Ignore_Server_Ids	
   --echo Master_Server_Id	#
+  --echo Gtid_Pos_Auto	0
 }
 if (!$tmp) {
   # Note: after WL#5177, fields 13-18 shall not be filtered-out.

mysql-test/mysql-test-run.pl

@@ -3449,8 +3449,9 @@ sub mysql_install_db {
   mtr_add_arg($args, "--bootstrap");
   mtr_add_arg($args, "--basedir=%s", $install_basedir);
   mtr_add_arg($args, "--datadir=%s", $install_datadir);
-  mtr_add_arg($args, "--default-storage-engine=myisam");
-  mtr_add_arg($args, "--skip-$_") for @optional_plugins;
+  mtr_add_arg($args, "--innodb");
+  mtr_add_arg($args, "--default-storage-engine=innodb");
+  mtr_add_arg($args, "--skip-$_") for grep (!/^innodb/, @optional_plugins);
   mtr_add_arg($args, "--disable-sync-frm");
   mtr_add_arg($args, "--tmpdir=%s", "$opt_vardir/tmp/");
   mtr_add_arg($args, "--core-file");

mysql-test/suite/rpl/r/rpl_gtid_basic.result

+include/rpl_init.inc [topology=1->2->3->4]
+CREATE TABLE t1 (a INT PRIMARY KEY, b VARCHAR(10)) ENGINE=MyISAM;
+CREATE TABLE t2 (a INT PRIMARY KEY, b VARCHAR(10)) ENGINE=InnoDB;
+INSERT INTO t1 VALUES (1, "m1");
+INSERT INTO t1 VALUES (2, "m2"), (3, "m3"), (4, "m4");
+INSERT INTO t2 VALUES (1, "i1");
+BEGIN;
+INSERT INTO t2 VALUES (2, "i2"), (3, "i3");
+INSERT INTO t2 VALUES (4, "i4");
+COMMIT;
+SELECT * FROM t1 ORDER BY a;
+a	b
+1	m1
+2	m2
+3	m3
+4	m4
+SELECT * FROM t2 ORDER BY a;
+a	b
+1	i1
+2	i2
+3	i3
+4	i4
+SELECT * FROM t1 ORDER BY a;
+a	b
+1	m1
+2	m2
+3	m3
+4	m4
+SELECT * FROM t2 ORDER BY a;
+a	b
+1	i1
+2	i2
+3	i3
+4	i4
+SELECT * FROM t1 ORDER BY a;
+a	b
+1	m1
+2	m2
+3	m3
+4	m4
+SELECT * FROM t2 ORDER BY a;
+a	b
+1	i1
+2	i2
+3	i3
+4	i4
+DROP TABLE t1,t2;
+include/rpl_end.inc

mysql-test/suite/rpl/t/rpl_gtid_basic.cnf

+!include ../my.cnf
+
+[mysqld.1]
+log-slave-updates
+loose-innodb
+
+[mysqld.2]
+log-slave-updates
+loose-innodb
+
+[mysqld.3]
+log-slave-updates
+loose-innodb
+
+[mysqld.4]
+log-slave-updates
+loose-innodb
+
+[ENV]
+SERVER_MYPORT_3=		@mysqld.3.port
+SERVER_MYSOCK_3=		@mysqld.3.socket
+
+SERVER_MYPORT_4=		@mysqld.4.port
+SERVER_MYSOCK_4=		@mysqld.4.socket

mysql-test/suite/rpl/t/rpl_gtid_basic.test

+--source include/have_innodb.inc
+--let $rpl_topology=1->2->3->4
+--source include/rpl_init.inc
+
+connection server_1;
+CREATE TABLE t1 (a INT PRIMARY KEY, b VARCHAR(10)) ENGINE=MyISAM;
+CREATE TABLE t2 (a INT PRIMARY KEY, b VARCHAR(10)) ENGINE=InnoDB;
+INSERT INTO t1 VALUES (1, "m1");
+INSERT INTO t1 VALUES (2, "m2"), (3, "m3"), (4, "m4");
+INSERT INTO t2 VALUES (1, "i1");
+BEGIN;
+INSERT INTO t2 VALUES (2, "i2"), (3, "i3");
+INSERT INTO t2 VALUES (4, "i4");
+COMMIT;
+save_master_pos;
+
+connection server_2;
+sync_with_master;
+SELECT * FROM t1 ORDER BY a;
+SELECT * FROM t2 ORDER BY a;
+save_master_pos;
+
+connection server_3;
+sync_with_master;
+SELECT * FROM t1 ORDER BY a;
+SELECT * FROM t2 ORDER BY a;
+save_master_pos;
+
+connection server_4;
+sync_with_master;
+SELECT * FROM t1 ORDER BY a;
+SELECT * FROM t2 ORDER BY a;
+
+connection server_1;
+DROP TABLE t1,t2;
+
+--source include/rpl_end.inc

sql/sql_repl.cc

@@ -3035,11 +3035,21 @@ rpl_load_gtid_slave_state(THD *thd)
   TABLE *table;
   bool table_opened= false;
   bool table_scanned= false;
+  struct local_element { uint64 sub_id; rpl_gtid gtid; };
+  struct local_element *entry;
+  HASH hash;
+  int err= 0;
+  uint32 i;
   DBUG_ENTER("rpl_load_gtid_slave_state");
 
-  int err= 0;
+  my_hash_init(&hash, &my_charset_bin, 32,
+               offsetof(local_element, gtid) + offsetof(rpl_gtid, domain_id),
+               sizeof(uint32), NULL, my_free, HASH_UNIQUE);
+
   rpl_global_gtid_slave_state.lock();
-  if (rpl_global_gtid_slave_state.loaded)
+  bool loaded= rpl_global_gtid_slave_state.loaded;
+  rpl_global_gtid_slave_state.unlock();
+  if (loaded)
     goto end;
 
   mysql_reset_thd_for_next_command(thd, 0);
@@ -3069,6 +3079,8 @@ rpl_load_gtid_slave_state(THD *thd)
   {
     uint32 domain_id, server_id;
     uint64 sub_id, seq_no;
+    uchar *rec;
+
     if ((err= table->file->ha_rnd_next(table->record[0])))
     {
       if (err == HA_ERR_RECORD_DELETED)
@@ -3085,13 +3097,50 @@ rpl_load_gtid_slave_state(THD *thd)
     DBUG_PRINT("info", ("Read slave state row: %u:%u-%lu sub_id=%lu\n",
                         (unsigned)domain_id, (unsigned)server_id,
                         (ulong)seq_no, (ulong)sub_id));
-    if ((err= rpl_global_gtid_slave_state.update(domain_id, server_id,
-                                                 sub_id, seq_no)))
-      goto end;
+    if ((rec= my_hash_search(&hash, (const uchar *)&domain_id, 0)))
+    {
+      entry= (struct local_element *)rec;
+      if (entry->sub_id >= sub_id)
+        continue;
+    }
+    else
+    {
+      if (!(entry= (struct local_element *)my_malloc(sizeof(*entry),
+                                                     MYF(MY_WME))))
+      {
+        err= 1;
+        goto end;
+      }
+      if ((err= my_hash_insert(&hash, (uchar *)entry)))
+      {
+        my_free(entry);
+        goto end;
+      }
+    }
+
+    entry->sub_id= sub_id;
+    entry->gtid.domain_id= domain_id;
+    entry->gtid.server_id= server_id;
+    entry->gtid.seq_no= seq_no;
   }
-  err= 0;                                       /* Clear HA_ERR_END_OF_FILE */
 
+  rpl_global_gtid_slave_state.lock();
+  for (i= 0; i < hash.records; ++i)
+  {
+    entry= (struct local_element *)my_hash_element(&hash, i);
+    if ((err= rpl_global_gtid_slave_state.update(entry->gtid.domain_id,
+                                                 entry->gtid.server_id,
+                                                 entry->sub_id,
+                                                 entry->gtid.seq_no)))
+    {
+      rpl_global_gtid_slave_state.unlock();
+      goto end;
+    }
+  }
   rpl_global_gtid_slave_state.loaded= true;
+  rpl_global_gtid_slave_state.unlock();
+
+  err= 0;                                       /* Clear HA_ERR_END_OF_FILE */
 
 end:
   if (table_scanned)
@@ -3102,7 +3151,7 @@ end:
   }
   if (table_opened)
     close_thread_tables(thd);
-  rpl_global_gtid_slave_state.unlock();
+  my_hash_free(&hash);
   DBUG_RETURN(err);
 }