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############################################################################### # Bug#22247668 SLAVE IS ~10X SLOWER TO EXECUTE SET OF STATEMENTS COMPARED TO # MASTER RBR # Problem: A new style of locking is implemented in Innodb. Starting from 5.6, # Innodb uses this new style of locking for all the cases except for the case # where for a simple (single/multi) row INSERTs, it fall back to old style # locking if another transaction has already acquired the AUTOINC lock on behalf of # a LOAD FILE or INSERT...SELECT etc. type of statement. But on # Slave, in RBR format, it is always using old style auto inc # algorithm. # # Steps to reproduce: # 1) Setup DEBUG simulation point on Slave to bring the server down # if the INSERT enters old style autoinc locking method. # # 2) Execute AUTOINC related work on Master. # # 3) Make sure that sync on slave happens without any issues. # ############################################################################### --source include/have_debug.inc --source include/have_binlog_format_row.inc --source include/master-slave.inc # Initial setup CREATE TABLE t (i INT AUTO_INCREMENT PRIMARY KEY) ENGINE=InnoDB; --source include/sync_slave_sql_with_master.inc # Step-1 : Setup DEBUG simulation point on Slave to bring the server down # if the INSERT enters old style autoinc locking method. SET @save_debug=@@debug; SET GLOBAL DEBUG='+d,die_if_autoinc_old_lock_style_used'; # Step-2 :Execute AUTOINC related work on Master. --source include/rpl_connection_master.inc INSERT INTO t VALUES (1); DROP TABLE t; # Step-3: Due to above DEBUG simulation point, server will go down if it enters # old autoinc lock style. After fix, sync on Slave happens without any issues. --source include/sync_slave_sql_with_master.inc # Cleanup # Reset the simulation point on Slave. SET GLOBAL DEBUG=@save_debug; --source include/rpl_end.inc