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################################################################################ # Bug#20464737 SEMI_SYNC: SLAVE IO FAILS WITH ER1236 'SLAVE HAS MORE GTIDS THAN # THE MASTER HAS' # # Slaves, especially semisync slaves, encountered ER1236 when connecting to # their masters. When connecting to the master with COM_GTID_DUMP request, # the slave sends all replicated gtids to master and master checks if all the # slave gtids(only the gtids have master's uuid) are included in master's # gtid_executed. However, there is a chance that a gtid is already in slave's # gtid_executed, but not in master's gtid_executed. Gtid is added into # gtid_executed after it is binlogged, so it is possible that a transaction is # replicated and applied on slave, but not committed on master yet. # # To fix it, master will check if all gtids are in the set of (gtid_executed, # owned_gtids). ################################################################################ --source include/not_group_replication_plugin.inc --source include/have_debug_sync.inc --source include/have_gtid.inc --source include/have_binlog_format_row.inc --source include/master-slave.inc CREATE TABLE t1(c1 INT); # The transaction will not commit until it get 'continue' signal. SET debug_sync = "bgc_after_sync_stage_before_commit_stage SIGNAL synced WAIT_FOR continue"; --send INSERT INTO t1 VALUES(1) --let $rpl_connection_name= default --source include/rpl_connection.inc SET debug_sync = "now WAIT_FOR synced"; --source include/sync_slave_sql_with_master.inc # After the transaction is replicated, io thread should be able to connect. --source include/stop_slave_io.inc --source include/start_slave_io.inc --let $rpl_connection_name= default --source include/rpl_connection.inc SET debug_sync = "now SIGNAL continue"; --source include/rpl_connection_master.inc --reap INSERT INTO t1 VALUES(2); DROP TABLE t1; --source include/rpl_end.inc