mysql Case ~ GTID multi-source copy

GTID restore the multi-source mode of replication and part of an example of building
a building
   1 mysqldump derived
      MySQL -B DB1> a.sql
      MySQL -B DB2> b.sql
   2 profile is set filtering rules
     replicate_wild_do_table = DB1.%
      Replicate_wild_do_table = DB2.%
  3 introducing forced
     MySQL -f <a.sql
     MySQL -f <b.sql
  . 4 for Change
     the CHANGE MASTER_HOST the MASTER the TO = '127.0.0.1', MASTER_PORT = 3306, MASTER_USER = 'the repl', MASTER_PASSWORD = 'the repl', =. 1 MASTER_AUTO_POSITION the CHANNEL the FOR '3306';
      the CHANGE MASTER_HOST the MASTER the TO = '127.0.0.1', MASTER_PORT = 3307, MASTER_USER = 'the repl', MASTER_PASSWORD = 'the repl', the FOR. 1 MASTER_AUTO_POSITION the CHANNEL = '3307';
  5 set to ignore the transaction
    . 1 RESET Master
    2 is set purge filter a.sql b.sql
    3 SET @@ GLOBAL.GTID_PURGED = '36a6ec7d- c959-11e9-9ade-60fa9dffe49b: 1-3,94ff46c0-680f-11e9-b5a9-60fa9dffe49b: 1-2,36a6ec7d-c959-11e9-9ade-60fa9dffe49b: 1-3 '
 6 start copy
   start Slave
  7 to see if the replication process normally
two repair to re-import a library
  1 STOP Slave for Channel' 3307 '&& drop the DB2 database  
  2 MySQL the DB2 -B> b.sql re-export the new library
  3 mysql -f <b re-introducing new library .sql
  4 stop slave replication stops all slave acquired this time gtid_purge
  . 5 filter b.sql obtain gtid_purge
  . 6 RESET Master set @@ GLOBAL.GTID_PURGED = 4 perform steps steps GTID + 5 GTID
  . 7 the MASTER the tO the CHANGE = MASTER_HOST '127.0.0.1', MASTER_PORT = 3307, MASTER_USER = 'the repl', MASTER_PASSWORD = 'the repl', the FOR. 1 MASTER_AUTO_POSITION the CHANNEL = '3307';
  . 8 Slave Start