Bug#31552 Replication breaks when deleting rows from out-of-sync table

    without PK
Bug#31609 Not all RBR slave errors reported as errors
bug#32468 delete rows event on a table with foreign key constraint fails

The first two bugs comprise idempotency issues.
First, there was no error code reported under conditions of the bug
description although the slave sql thread halted.
Second, executions were different with and without presence of prim key in
the table.
Third, there was no way to instruct the slave whether to ignore an error
and skip to the following event or to halt.
Fourth, there are handler errors which might happen due to idempotent
applying of binlog but those were not listed among the "idempotent" error
list.

All the named issues are addressed.
Wrt to the 3rd, there is the new global system variable, changeble at run
time, which controls the slave sql thread behaviour.
The new variable allows further extensions to mimic the sql_mode
session/global variable.
To address the 4th, the new bug#32468 had to be fixed as it was staying
in the way.

include/my_bitmap.h

@@ -159,6 +159,22 @@ static inline my_bool bitmap_cmp(const MY_BITMAP *map1, const MY_BITMAP *map2)
 #define bitmap_set_all(MAP) \
   (memset((MAP)->bitmap, 0xFF, 4*no_words_in_map((MAP))))
 
+/**
+   check, set and clear a bit of interest of an integer.
+
+   If the bit is out of range @retval -1. Otherwise
+   bit_is_set   @return 0 or 1 reflecting the bit is set or not;
+   bit_do_set   @return 1 (bit is set 1)
+   bit_do_clear @return 0 (bit is cleared to 0)
+*/
+
+#define bit_is_set(I,B)   (sizeof(I) * CHAR_BIT > (B) ?                 \
+                           (((I) & (ULL(1) << (B))) == 0 ? 0 : 1) : -1)
+#define bit_do_set(I,B)   (sizeof(I) * CHAR_BIT > (B) ?         \
+                           ((I) |= (ULL(1) << (B)), 1) : -1)
+#define bit_do_clear(I,B) (sizeof(I) * CHAR_BIT > (B) ?         \
+                           ((I) &= ~(ULL(1) << (B)), 0) : -1)
+
 #ifdef	__cplusplus
 }
 #endif

mysql-test/extra/rpl_tests/rpl_foreign_key.test

@@ -32,3 +32,34 @@ SET FOREIGN_KEY_CHECKS=0;
 DROP TABLE IF EXISTS t1,t2,t3;
 SET FOREIGN_KEY_CHECKS=1;
 sync_slave_with_master;
+
+#
+# Bug #32468 delete rows event on a table with foreign key constraint fails
+#
+
+connection master;
+
+eval create table t1 (b int primary key) engine = $engine_type;
+eval create table t2 (a int primary key, b int, foreign key (b) references t1(b))
+       engine = $engine_type;
+
+insert into t1 set b=1;
+insert into t2 set a=1, b=1;
+
+set foreign_key_checks=0;
+set @@session.binlog_format=row;
+delete from t1;
+
+--echo must sync w/o a problem (could not with the buggy code)
+sync_slave_with_master;
+select count(*) from t1 /* must be zero */;
+
+
+# cleanup for bug#32468
+
+connection master;
+drop table t2,t1;
+
+sync_slave_with_master;
+
+

mysql-test/extra/rpl_tests/rpl_row_basic.test

@@ -174,11 +174,18 @@ sync_slave_with_master;
 INSERT INTO t7 VALUES (1,3), (2,6), (3,9);
 SELECT * FROM t7 ORDER BY C1;
 
+# since bug#31552/31609 idempotency is not default any longer. In order
+# the preceeding test INSERT INTO t7 to pass the mode is switched
+# temprorarily
+set @@global.slave_exec_mode= 'IDEMPOTENT';
+
 connection master;
 --echo --- on master: new values inserted ---
 INSERT INTO t7 VALUES (1,2), (2,4), (3,6);
 SELECT * FROM t7 ORDER BY C1;
 sync_slave_with_master;
+
+set @@global.slave_exec_mode= default;
 --echo --- on slave: old values should be overwritten by replicated values ---
 SELECT * FROM t7 ORDER BY C1;
 
@@ -206,12 +213,19 @@ SELECT * FROM t8 ORDER BY a;
 INSERT INTO t8 VALUES (1,2,3), (2,4,6), (3,6,9);
 SELECT * FROM t8 ORDER BY a;
 
+# since bug#31552/31609 idempotency is not default any longer. In order
+# the preceeding test INSERT INTO t8 to pass the mode is switched
+# temprorarily
+set @@global.slave_exec_mode= 'IDEMPOTENT';
+
 connection master;
 --echo --- on master ---
 # We insert a row that will cause conflict on the primary key but not
 # on the other keys.
 INSERT INTO t8 VALUES (2,4,8);
 sync_slave_with_master;
+set @@global.slave_exec_mode= default;
+
 --echo --- on slave ---
 SELECT * FROM t8 ORDER BY a;
 

mysql-test/extra/rpl_tests/rpl_row_tabledefs.test

@@ -69,6 +69,11 @@ ALTER TABLE t8 ADD e1 INT NOT NULL DEFAULT 0, ADD e2 INT NOT NULL DEFAULT 0,
         
 # Insert some values for tables on slave side. These should not be
 # modified when the row from the master is applied.
+# since bug#31552/31609 idempotency is not default any longer. In order
+# the following INSERTs to pass the mode is switched temprorarily
+set @@global.slave_exec_mode= 'IDEMPOTENT';
+
+# so the inserts are going to be overriden
 INSERT INTO t1_int  VALUES (2, 4, 4711);
 INSERT INTO t1_char VALUES (2, 4, 'Foo is a bar');
 INSERT INTO t1_bit  VALUES (2, 4, b'101', b'11100', b'01');
@@ -86,6 +91,8 @@ SELECT * FROM t1_bit ORDER BY a;
 SELECT * FROM t1_char ORDER BY a;
 --echo **** On Slave ****
 sync_slave_with_master;
+set @@global.slave_exec_mode= default;
+
 SELECT a,b,x FROM t1_int ORDER BY a;
 SELECT a,b,HEX(x),HEX(y),HEX(z) FROM t1_bit ORDER BY a;
 SELECT a,b,x FROM t1_char ORDER BY a;

mysql-test/r/bdb_notembedded.result

+set autocommit=1;
+reset master;
+create table bug16206 (a int);
+insert into bug16206 values(1);
+start transaction;
+insert into bug16206 values(2);
+commit;
+show binlog events;
+Log_name	Pos	Event_type	Server_id	End_log_pos	Info
+f	n	Format_desc	1	n	Server ver: VERSION, Binlog ver: 4
+f	n	Query	1	n	use `test`; create table bug16206 (a int)
+f	n	Query	1	n	use `test`; insert into bug16206 values(1)
+f	n	Query	1	n	use `test`; insert into bug16206 values(2)
+drop table bug16206;
+reset master;
+create table bug16206 (a int) engine=         bdb;
+insert into bug16206 values(0);
+insert into bug16206 values(1);
+start transaction;
+insert into bug16206 values(2);
+commit;
+insert into bug16206 values(3);
+show binlog events;
+Log_name	Pos	Event_type	Server_id	End_log_pos	Info
+f	n	Format_desc	1	n	Server ver: VERSION, Binlog ver: 4
+f	n	Query	1	n	use `test`; create table bug16206 (a int) engine=         bdb
+f	n	Query	1	n	use `test`; insert into bug16206 values(0)
+f	n	Query	1	n	use `test`; insert into bug16206 values(1)
+f	n	Query	1	n	use `test`; BEGIN
+f	n	Query	1	n	use `test`; insert into bug16206 values(2)
+f	n	Query	1	n	use `test`; COMMIT
+f	n	Query	1	n	use `test`; insert into bug16206 values(3)
+drop table bug16206;
+set autocommit=0;
+End of 5.0 tests

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

@@ -40,3 +40,16 @@ Got one of the listed errors
 SET FOREIGN_KEY_CHECKS=0;
 DROP TABLE IF EXISTS t1,t2,t3;
 SET FOREIGN_KEY_CHECKS=1;
+create table t1 (b int primary key) engine = INNODB;
+create table t2 (a int primary key, b int, foreign key (b) references t1(b))
+engine = INNODB;
+insert into t1 set b=1;
+insert into t2 set a=1, b=1;
+set foreign_key_checks=0;
+set @@session.binlog_format=row;
+delete from t1;
+must sync w/o a problem (could not with the buggy code)
+select count(*) from t1 /* must be zero */;
+count(*)
+0
+drop table t2,t1;

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

@@ -69,3 +69,158 @@ a
 Last_SQL_Error
 0
 DROP TABLE t1, t2;
+select @@global.slave_exec_mode /* must be IDEMPOTENT */;
+@@global.slave_exec_mode
+IDEMPOTENT
+create table ti1 (b int primary key) engine = innodb;
+create table ti2 (a int primary key, b int, foreign key (b) references ti1(b))
+engine = innodb;
+set foreign_key_checks=1 /* ensure the check */;
+insert into ti1 values (1),(2),(3);
+insert into ti2 set a=2, b=2;
+select * from ti1 order by b /* must be (1),(2),(3) */;
+b
+1
+2
+3
+insert into ti2 set a=1, b=1;
+select * from ti2 order by b /* must be (1,1) (2,2) */;
+a	b
+1	1
+2	2
+set @save_binlog_format= @@session.binlog_format;
+set @@session.binlog_format= row;
+delete from ti1 where b=1;
+select * from ti1 order by b /* must be (2),(3) */;
+b
+2
+3
+select * from ti1 order by b /* must stays as were on master (1),(2),(3) */;
+b
+1
+2
+3
+delete from ti1 where b=3;
+insert into ti2 set a=3, b=3;
+select * from ti2 order by b /* must be (1,1),(2,2) - not inserted */;
+a	b
+1	1
+2	2
+set global slave_exec_mode='IDEMPOTENT';
+set global slave_exec_mode='STRICT';
+set global slave_exec_mode='IDEMPOTENT,STRICT';
+ERROR HY000: Ambiguous slave modes combination. 
+select @@global.slave_exec_mode /* must be STRICT */;
+@@global.slave_exec_mode
+STRICT
+*** foreign keys errors as above now forces to stop
+set foreign_key_checks=0;
+drop table ti2, ti1;
+create table ti1 (b int primary key) engine = innodb;
+create table ti2 (a int primary key, b int, foreign key (b) references ti1(b))
+engine = innodb;
+set foreign_key_checks=1 /* ensure the check */;
+insert into ti1 values (1),(2),(3);
+insert into ti2 set a=2, b=2;
+select * from ti1 order by b /* must be (1),(2),(3) */;
+b
+1
+2
+3
+*** conspire future problem
+insert into ti2 set a=1, b=1;
+select * from ti2 order by b /* must be (1,1) (2,2) */;
+a	b
+1	1
+2	2
+delete from ti1 where b=1 /* offending delete event */;
+select * from ti1 order by b /* must be (2),(3) */;
+b
+2
+3
+*** slave must stop
+Last_SQL_Error
+0
+select * from ti1 order by b /* must be (1),(2),(3) - not deleted */;
+b
+1
+2
+3
+set foreign_key_checks= 0;
+delete from ti2 where b=1;
+set foreign_key_checks= 1;
+set global slave_exec_mode='IDEMPOTENT';
+start slave sql_thread;
+set global slave_exec_mode='STRICT';
+*** conspire the following insert failure
+*** conspire future problem
+delete from ti1 where b=3;
+insert into ti2 set a=3, b=3 /* offending write event */;
+*** slave must stop
+Last_SQL_Error
+1452
+select * from ti2 order by b /* must be (2,2) */;
+a	b
+2	2
+set foreign_key_checks= 0;
+insert into ti1 set b=3;
+set foreign_key_checks= 1;
+set global slave_exec_mode='IDEMPOTENT';
+start slave sql_thread;
+set global slave_exec_mode='STRICT';
+select * from ti2 order by b /* must be (2,2),(3,3) */;
+a	b
+2	2
+3	3
+*** other errors
+*** conspiring query
+insert into ti1 set b=1;
+insert into ti1 set b=1 /* offending write event */;
+*** slave must stop
+Last_SQL_Error
+1062
+set foreign_key_checks= 0;
+delete from ti1 where b=1;
+set foreign_key_checks= 1;
+set global slave_exec_mode='IDEMPOTENT';
+start slave sql_thread;
+set global slave_exec_mode='STRICT';
+CREATE TABLE t1 (a INT PRIMARY KEY);
+CREATE TABLE t2 (a INT);
+INSERT INTO t1 VALUES (-1),(-2),(-3);
+INSERT INTO t2 VALUES (-1),(-2),(-3);
+DELETE FROM t1 WHERE a = -2;
+DELETE FROM t2 WHERE a = -2;
+DELETE FROM t1 WHERE a = -2;
+*** slave must stop
+Last_SQL_Error
+1032
+set global slave_exec_mode='IDEMPOTENT';
+start slave sql_thread;
+set global slave_exec_mode='STRICT';
+DELETE FROM t2 WHERE a = -2;
+*** slave must stop
+Last_SQL_Error
+0
+set global slave_exec_mode='IDEMPOTENT';
+start slave sql_thread;
+set global slave_exec_mode='STRICT';
+UPDATE t1 SET a = 1 WHERE a = -1;
+UPDATE t2 SET a = 1 WHERE a = -1;
+UPDATE t1 SET a = 1 WHERE a = -1;
+*** slave must stop
+Last_SQL_Error
+1032
+set global slave_exec_mode='IDEMPOTENT';
+start slave sql_thread;
+set global slave_exec_mode='STRICT';
+UPDATE t2 SET a = 1 WHERE a = -1;
+*** slave must stop
+Last_SQL_Error
+0
+set global slave_exec_mode='IDEMPOTENT';
+start slave sql_thread;
+set global slave_exec_mode='STRICT';
+set @@session.binlog_format= @save_binlog_format;
+drop table t1,t2,ti2,ti1;
+*** end of tests

mysql-test/suite/rpl/r/rpl_row_basic_11bugs.result

@@ -257,6 +257,7 @@ SELECT * FROM t1 ORDER BY a;
 a	b
 2	master,slave
 5	slave
+set @@global.slave_exec_mode= 'IDEMPOTENT';
 **** On Master ****
 UPDATE t1 SET a = 5, b = 'master' WHERE a = 1;
 SELECT * FROM t1 ORDER BY a;
@@ -264,6 +265,7 @@ a	b
 2	master,slave
 5	master
 **** On Slave ****
+set @@global.slave_exec_mode= default;
 Last_SQL_Error
 
 SELECT * FROM t1 ORDER BY a;

mysql-test/suite/rpl/r/rpl_row_basic_2myisam.result

@@ -370,6 +370,7 @@ C1	C2
 1	3
 2	6
 3	9
+set @@global.slave_exec_mode= 'IDEMPOTENT';
 --- on master: new values inserted ---
 INSERT INTO t7 VALUES (1,2), (2,4), (3,6);
 SELECT * FROM t7 ORDER BY C1;
@@ -377,6 +378,7 @@ C1	C2
 1	2
 2	4
 3	6
+set @@global.slave_exec_mode= default;
 --- on slave: old values should be overwritten by replicated values ---
 SELECT * FROM t7 ORDER BY C1;
 C1	C2
@@ -406,8 +408,10 @@ a	b	c
 2	4	6
 3	6	9
 99	99	99
+set @@global.slave_exec_mode= 'IDEMPOTENT';
 --- on master ---
 INSERT INTO t8 VALUES (2,4,8);
+set @@global.slave_exec_mode= default;
 --- on slave ---
 SELECT * FROM t8 ORDER BY a;
 a	b	c

mysql-test/suite/rpl/r/rpl_row_basic_3innodb.result

@@ -370,6 +370,7 @@ C1	C2
 1	3
 2	6
 3	9
+set @@global.slave_exec_mode= 'IDEMPOTENT';
 --- on master: new values inserted ---
 INSERT INTO t7 VALUES (1,2), (2,4), (3,6);
 SELECT * FROM t7 ORDER BY C1;
@@ -377,6 +378,7 @@ C1	C2
 1	2
 2	4
 3	6
+set @@global.slave_exec_mode= default;
 --- on slave: old values should be overwritten by replicated values ---
 SELECT * FROM t7 ORDER BY C1;
 C1	C2
@@ -406,8 +408,10 @@ a	b	c
 2	4	6
 3	6	9
 99	99	99
+set @@global.slave_exec_mode= 'IDEMPOTENT';
 --- on master ---
 INSERT INTO t8 VALUES (2,4,8);
+set @@global.slave_exec_mode= default;
 --- on slave ---
 SELECT * FROM t8 ORDER BY a;
 a	b	c

mysql-test/suite/rpl/r/rpl_row_mystery22.result

@@ -5,6 +5,7 @@ reset slave;
 drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
 start slave;
 create table t1(n int auto_increment primary key, s char(10));
+set @@global.slave_exec_mode= 'IDEMPOTENT';
 insert into t1 values (2,'old');
 insert into t1 values(NULL,'new');
 insert into t1 values(NULL,'new');
@@ -28,3 +29,4 @@ n	s
 1	new
 3	new
 drop table t1;
+set @@global.slave_exec_mode= default;

mysql-test/suite/rpl/r/rpl_row_tabledefs_2myisam.result

@@ -37,6 +37,7 @@ ALTER TABLE t8 ADD e1 INT NOT NULL DEFAULT 0, ADD e2 INT NOT NULL DEFAULT 0,
 ADD e3 INT NOT NULL DEFAULT 0, ADD e4 INT NOT NULL DEFAULT 0,
 ADD e5 INT NOT NULL DEFAULT 0, ADD e6 INT NOT NULL DEFAULT 0,
 ADD e7 INT NOT NULL DEFAULT 0, ADD e8 INT NOT NULL DEFAULT 0;
+set @@global.slave_exec_mode= 'IDEMPOTENT';
 INSERT INTO t1_int  VALUES (2, 4, 4711);
 INSERT INTO t1_char VALUES (2, 4, 'Foo is a bar');
 INSERT INTO t1_bit  VALUES (2, 4, b'101', b'11100', b'01');
@@ -60,6 +61,7 @@ a	b
 1	2
 2	5
 **** On Slave ****
+set @@global.slave_exec_mode= default;
 SELECT a,b,x FROM t1_int ORDER BY a;
 a	b	x
 1	2	42
@@ -123,7 +125,7 @@ Replicate_Ignore_Table
 Replicate_Wild_Do_Table	
 Replicate_Wild_Ignore_Table	
 Last_Errno	1364
-Last_Error	Error in Write_rows event: error during transaction execution on table test.t1_nodef. 
+Last_Error	Could not execute Write_rows event on table test.t1_nodef; handler error <unknown>; the event's master log master-bin.000001, end_log_pos 2674
 Skip_Counter	0
 Exec_Master_Log_Pos	#
 Relay_Log_Space	#
@@ -141,7 +143,7 @@ Master_SSL_Verify_Server_Cert	No
 Last_IO_Errno	0
 Last_IO_Error	
 Last_SQL_Errno	1364
-Last_SQL_Error	Error in Write_rows event: error during transaction execution on table test.t1_nodef. 
+Last_SQL_Error	Could not execute Write_rows event on table test.t1_nodef; handler error <unknown>; the event's master log master-bin.000001, end_log_pos 2674
 SET GLOBAL SQL_SLAVE_SKIP_COUNTER=2;
 START SLAVE;
 INSERT INTO t9 VALUES (2);

mysql-test/suite/rpl/r/rpl_row_tabledefs_3innodb.result

@@ -37,6 +37,7 @@ ALTER TABLE t8 ADD e1 INT NOT NULL DEFAULT 0, ADD e2 INT NOT NULL DEFAULT 0,
 ADD e3 INT NOT NULL DEFAULT 0, ADD e4 INT NOT NULL DEFAULT 0,
 ADD e5 INT NOT NULL DEFAULT 0, ADD e6 INT NOT NULL DEFAULT 0,
 ADD e7 INT NOT NULL DEFAULT 0, ADD e8 INT NOT NULL DEFAULT 0;
+set @@global.slave_exec_mode= 'IDEMPOTENT';
 INSERT INTO t1_int  VALUES (2, 4, 4711);
 INSERT INTO t1_char VALUES (2, 4, 'Foo is a bar');
 INSERT INTO t1_bit  VALUES (2, 4, b'101', b'11100', b'01');
@@ -60,6 +61,7 @@ a	b
 1	2
 2	5
 **** On Slave ****
+set @@global.slave_exec_mode= default;
 SELECT a,b,x FROM t1_int ORDER BY a;
 a	b	x
 1	2	42
@@ -123,7 +125,7 @@ Replicate_Ignore_Table
 Replicate_Wild_Do_Table	
 Replicate_Wild_Ignore_Table	
 Last_Errno	1364
-Last_Error	Error in Write_rows event: error during transaction execution on table test.t1_nodef. 
+Last_Error	Could not execute Write_rows event on table test.t1_nodef; handler error <unknown>; the event's master log master-bin.000001, end_log_pos 2944
 Skip_Counter	0
 Exec_Master_Log_Pos	#
 Relay_Log_Space	#
@@ -141,7 +143,7 @@ Master_SSL_Verify_Server_Cert	No
 Last_IO_Errno	0
 Last_IO_Error	
 Last_SQL_Errno	1364
-Last_SQL_Error	Error in Write_rows event: error during transaction execution on table test.t1_nodef. 
+Last_SQL_Error	Could not execute Write_rows event on table test.t1_nodef; handler error <unknown>; the event's master log master-bin.000001, end_log_pos 2944
 SET GLOBAL SQL_SLAVE_SKIP_COUNTER=2;
 START SLAVE;
 INSERT INTO t9 VALUES (2);

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

@@ -12,6 +12,7 @@ INSERT INTO t1 VALUES (1,1), (2,2), (3,3), (4,4);
 SHOW STATUS LIKE 'Slave_retried_transactions';
 Variable_name	Value
 Slave_retried_transactions	0
+set @@global.slave_exec_mode= 'IDEMPOTENT';
 UPDATE t1 SET a = 5, b = 47 WHERE a = 1;
 SELECT * FROM t1;
 a	b
@@ -28,6 +29,7 @@ a	b
 3	3
 4	4
 **** On Slave ****
+set @@global.slave_exec_mode= default;
 SHOW STATUS LIKE 'Slave_retried_transactions';
 Variable_name	Value
 Slave_retried_transactions	0

mysql-test/suite/rpl/t/rpl_idempotency-master.opt

+--innodb
+

mysql-test/suite/rpl/t/rpl_idempotency-slave.opt

+--slave-exec-mode=IDEMPOTENT --innodb
+

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

@@ -77,3 +77,335 @@ enable_query_log;
 connection master;
 DROP TABLE t1, t2;
 sync_slave_with_master;
+
+# bug#31609 Not all RBR slave errors reported as errors
+# bug#31552 Replication breaks when deleting rows from out-of-sync table
+#           without PK
+
+#
+# Idempotent applying is not default any longer.
+# The default for slave-exec-mode option and server
+# variable slave_exec_mode  is 'STRICT'.
+# When 'STRICT' mode is set, the slave SQL thread will stop whenever
+# the row to change is not found. In 'IDEMPOTENT' mode, the SQL thread
+# will continue running and apply the row - replace if it's Write_rows event -
+# or skip to the next event.
+
+# the previous part of the tests was with IDEMPOTENT slave's mode.
+
+
+#
+# Other than above idempotent errors dealing with foreign keys constraint
+#
+
+select @@global.slave_exec_mode /* must be IDEMPOTENT */;
+
+connection master;
+
+create table ti1 (b int primary key) engine = innodb;
+create table ti2 (a int primary key, b int, foreign key (b) references ti1(b))
+     engine = innodb;
+set foreign_key_checks=1 /* ensure the check */;
+
+insert into ti1 values (1),(2),(3);
+insert into ti2 set a=2, b=2;
+
+sync_slave_with_master;
+
+#connection slave;
+select * from ti1 order by b /* must be (1),(2),(3) */;
+insert into ti2 set a=1, b=1;
+select * from ti2 order by b /* must be (1,1) (2,2) */;
+
+connection master;
+
+# from now on checking rbr specific idempotent errors
+set @save_binlog_format= @@session.binlog_format;
+set @@session.binlog_format= row;
+delete from ti1 where b=1;
+
+select * from ti1 order by b /* must be (2),(3) */;
+
+# slave must catch up (expect some warnings in error.log)
+sync_slave_with_master;
+
+#connection slave;
+select * from ti1 order by b /* must stays as were on master (1),(2),(3) */;
+
+delete from ti1 where b=3;
+
+connection master;
+insert into ti2 set a=3, b=3;
+
+# slave must catch up (expect some warnings in error.log)
+sync_slave_with_master;
+
+#connection slave;
+select * from ti2 order by b /* must be (1,1),(2,2) - not inserted */;
+
+
+#
+# Checking the new global sys variable
+#
+
+connection slave;
+
+set global slave_exec_mode='IDEMPOTENT';
+set global slave_exec_mode='STRICT';
+
+# checking mutual exclusion for the options
+--error ER_SLAVE_AMBIGOUS_EXEC_MODE
+set global slave_exec_mode='IDEMPOTENT,STRICT';
+
+select @@global.slave_exec_mode /* must be STRICT */;
+
+#
+# Checking stops.
+# In the following sections strict slave sql thread is going to
+# stop when faces an idempotent error. In order to proceed
+# the mode is temporarily switched to indempotent.
+#
+
+#
+--echo *** foreign keys errors as above now forces to stop
+#
+
+connection master;
+
+set foreign_key_checks=0;
+drop table ti2, ti1;
+
+create table ti1 (b int primary key) engine = innodb;
+create table ti2 (a int primary key, b int, foreign key (b) references ti1(b))
+     engine = innodb;
+set foreign_key_checks=1 /* ensure the check */;
+
+insert into ti1 values (1),(2),(3);
+insert into ti2 set a=2, b=2;
+
+sync_slave_with_master;
+
+#connection slave;
+select * from ti1 order by b /* must be (1),(2),(3) */;
+--echo *** conspire future problem
+insert into ti2 set a=1, b=1;
+select * from ti2 order by b /* must be (1,1) (2,2) */;
+
+connection master;
+
+delete from ti1 where b=1 /* offending delete event */;
+select * from ti1 order by b /* must be (2),(3) */;
+
+# foreign key: row is referenced
+
+--echo *** slave must stop
+source include/wait_for_slave_sql_to_stop.inc;
+
+connection slave;
+
+let $last_error = query_get_value("SHOW SLAVE STATUS", Last_SQL_Errno, 1);
+disable_query_log;
+eval SELECT "$last_error" AS Last_SQL_Error;
+enable_query_log;
+
+select * from ti1 order by b /* must be (1),(2),(3) - not deleted */;
+set foreign_key_checks= 0;
+delete from ti2 where b=1;
+set foreign_key_checks= 1;
+set global slave_exec_mode='IDEMPOTENT';
+start slave sql_thread;
+connection master;
+sync_slave_with_master;
+#connection slave;
+set global slave_exec_mode='STRICT';
+
+connection master;
+
+sync_slave_with_master;
+
+#connection slave;
+--echo *** conspire the following insert failure
+# foreign key: no referenced row
+
+--echo *** conspire future problem
+delete from ti1 where b=3;
+
+connection master;
+insert into ti2 set a=3, b=3 /* offending write event */;
+--echo *** slave must stop
+
+source include/wait_for_slave_sql_to_stop.inc;
+
+connection slave;
+
+let $last_error = query_get_value("SHOW SLAVE STATUS", Last_SQL_Errno, 1);
+disable_query_log;
+eval SELECT "$last_error" AS Last_SQL_Error;
+enable_query_log;
+
+select * from ti2 order by b /* must be (2,2) */;
+set foreign_key_checks= 0;
+insert into ti1 set b=3;
+set foreign_key_checks= 1;
+set global slave_exec_mode='IDEMPOTENT';
+start slave sql_thread;
+connection master;
+sync_slave_with_master;
+#connection slave;
+set global slave_exec_mode='STRICT';
+
+connection master;
+
+sync_slave_with_master;
+
+select * from ti2 order by b /* must be (2,2),(3,3) */;
+
+# 
+--echo *** other errors
+# 
+
+# dup key insert
+
+#connection slave;
+--echo *** conspiring query
+insert into ti1 set b=1;
+
+connection master;
+insert into ti1 set b=1 /* offending write event */;
+
+--echo *** slave must stop
+source include/wait_for_slave_sql_to_stop.inc;
+
+connection slave;
+
+let $last_error = query_get_value("SHOW SLAVE STATUS", Last_SQL_Errno, 1);
+disable_query_log;
+eval SELECT "$last_error" AS Last_SQL_Error;
+enable_query_log;
+
+set foreign_key_checks= 0;
+delete from ti1 where b=1;
+set foreign_key_checks= 1;
+set global slave_exec_mode='IDEMPOTENT';
+start slave sql_thread;
+connection master;
+sync_slave_with_master;
+#connection slave;
+set global slave_exec_mode='STRICT';
+
+# key not found
+
+connection master;
+
+CREATE TABLE t1 (a INT PRIMARY KEY);
+CREATE TABLE t2 (a INT);
+INSERT INTO t1 VALUES (-1),(-2),(-3);
+INSERT INTO t2 VALUES (-1),(-2),(-3);
+sync_slave_with_master;
+
+#connection slave;
+DELETE FROM t1 WHERE a = -2;
+DELETE FROM t2 WHERE a = -2;
+connection master;
+DELETE FROM t1 WHERE a = -2;
+
+--echo *** slave must stop
+source include/wait_for_slave_sql_to_stop.inc;
+
+connection slave;
+
+let $last_error = query_get_value("SHOW SLAVE STATUS", Last_SQL_Errno, 1);
+disable_query_log;
+eval SELECT "$last_error" AS Last_SQL_Error;
+enable_query_log;
+
+set global slave_exec_mode='IDEMPOTENT';
+start slave sql_thread;
+connection master;
+sync_slave_with_master;
+#connection slave;
+set global slave_exec_mode='STRICT';
+
+connection master;
+DELETE FROM t2 WHERE a = -2;
+--echo *** slave must stop
+source include/wait_for_slave_sql_to_stop.inc;
+
+connection slave;
+
+let $last_error = query_get_value("SHOW SLAVE STATUS", Last_SQL_Errno, 1);
+disable_query_log;
+eval SELECT "$last_error" AS Last_SQL_Error;
+enable_query_log;
+
+set global slave_exec_mode='IDEMPOTENT';
+start slave sql_thread;
+connection master;
+sync_slave_with_master;
+#connection slave;
+set global slave_exec_mode='STRICT';
+
+UPDATE t1 SET a = 1 WHERE a = -1;
+UPDATE t2 SET a = 1 WHERE a = -1;
+
+connection master;
+UPDATE t1 SET a = 1 WHERE a = -1;
+
+--echo *** slave must stop
+source include/wait_for_slave_sql_to_stop.inc;
+
+connection slave;
+
+let $last_error = query_get_value("SHOW SLAVE STATUS", Last_SQL_Errno, 1);
+disable_query_log;
+eval SELECT "$last_error" AS Last_SQL_Error;
+enable_query_log;
+
+set global slave_exec_mode='IDEMPOTENT';
+start slave sql_thread;
+connection master;
+sync_slave_with_master;
+#connection slave;
+set global slave_exec_mode='STRICT';
+
+
+connection master;
+UPDATE t2 SET a = 1 WHERE a = -1;
+
+--echo *** slave must stop
+source include/wait_for_slave_sql_to_stop.inc;
+
+connection slave;
+
+let $last_error = query_get_value("SHOW SLAVE STATUS", Last_SQL_Errno, 1);
+disable_query_log;
+eval SELECT "$last_error" AS Last_SQL_Error;
+enable_query_log;
+
+set global slave_exec_mode='IDEMPOTENT';
+start slave sql_thread;
+connection master;
+sync_slave_with_master;
+#connection slave;
+set global slave_exec_mode='STRICT';
+
+
+# cleanup for bug#31609 tests
+
+connection master;
+set @@session.binlog_format= @save_binlog_format;
+drop table t1,t2,ti2,ti1;
+
+sync_slave_with_master;
+
+
+--echo *** end of tests
+
+
+
+
+
+
+
+
+

mysql-test/suite/rpl/t/rpl_row_basic_11bugs.test

@@ -242,12 +242,17 @@ INSERT INTO t1 VALUES (1,'master,slave'), (2,'master,slave');
 sync_slave_with_master;
 UPDATE t1 SET a = 5, b = 'slave' WHERE a = 1;
 SELECT * FROM t1 ORDER BY a;
+# since bug#31552/31609 idempotency is not default any longer. In
+# order the preceeding test UPDATE t1 to pass the mode is switched
+# temprorarily
+set @@global.slave_exec_mode= 'IDEMPOTENT';
 --echo **** On Master ****
 connection master;
 UPDATE t1 SET a = 5, b = 'master' WHERE a = 1;
 SELECT * FROM t1 ORDER BY a;
 --echo **** On Slave ****
 sync_slave_with_master;
+set @@global.slave_exec_mode= default;
 let $last_error = query_get_value("SHOW SLAVE STATUS", Last_SQL_Error, 1);
 disable_query_log;
 eval SELECT "$last_error" AS Last_SQL_Error;

mysql-test/suite/rpl/t/rpl_row_mystery22.test

@@ -9,6 +9,12 @@
 # first, cause a duplicate key problem on the slave
 create table t1(n int auto_increment primary key, s char(10));
 sync_slave_with_master;
+
+# bug#31552/31609 idempotency is not default any longer
+# so that the declared in heading comments aim of the test
+# should be backed up with explicit setting of the slave mode
+set @@global.slave_exec_mode= 'IDEMPOTENT';
+
 insert into t1 values (2,'old');
 connection master;
 insert into t1 values(NULL,'new');
@@ -43,3 +49,4 @@ select * from t1 order by n;
 connection master;
 drop table t1;
 sync_slave_with_master;
+set @@global.slave_exec_mode= default;

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

@@ -8,6 +8,9 @@ INSERT INTO t1 VALUES (1,1), (2,2), (3,3), (4,4);
 --echo **** On Slave ****
 sync_slave_with_master;
 SHOW STATUS LIKE 'Slave_retried_transactions';
+# since bug#31552/31609 idempotency is not default any longer. In order
+# the following UPDATE t1 to pass the mode is switched temprorarily
+set @@global.slave_exec_mode= 'IDEMPOTENT';
 UPDATE t1 SET a = 5, b = 47 WHERE a = 1;
 SELECT * FROM t1;
 --echo **** On Master ****
@@ -17,6 +20,7 @@ SELECT * FROM t1;
 #SHOW BINLOG EVENTS;
 --echo **** On Slave ****
 sync_slave_with_master;
+set @@global.slave_exec_mode= default;
 SHOW STATUS LIKE 'Slave_retried_transactions';
 SELECT * FROM t1;
 source include/show_slave_status.inc;

mysql-test/suite/rpl_ndb/r/rpl_ndb_dd_advance.result

@@ -301,6 +301,7 @@ SELECT COUNT(*) FROM history;
 COUNT(*)
 400
 *** DUMP MASTER & SLAVE FOR COMPARE ********
+set @@global.slave_exec_mode='IDEMPOTENT' /* to ignore missed records in mysql.proc */;
 *************** TEST 2 CLEANUP SECTION ********************
 DROP PROCEDURE IF EXISTS tpcb.load;
 DROP PROCEDURE IF EXISTS tpcb.trans;

mysql-test/suite/rpl_ndb/r/rpl_row_basic_7ndb.result

@@ -370,6 +370,7 @@ C1	C2
 1	3
 2	6
 3	9
+set @@global.slave_exec_mode= 'IDEMPOTENT';
 --- on master: new values inserted ---
 INSERT INTO t7 VALUES (1,2), (2,4), (3,6);
 SELECT * FROM t7 ORDER BY C1;
@@ -377,6 +378,7 @@ C1	C2
 1	2
 2	4
 3	6
+set @@global.slave_exec_mode= 'STRICT';
 --- on slave: old values should be overwritten by replicated values ---
 SELECT * FROM t7 ORDER BY C1;
 C1	C2
@@ -406,8 +408,10 @@ a	b	c
 2	4	6
 3	6	9
 99	99	99
+set @@global.slave_exec_mode= 'IDEMPOTENT';
 --- on master ---
 INSERT INTO t8 VALUES (2,4,8);
+set @@global.slave_exec_mode= default;
 --- on slave ---
 SELECT * FROM t8 ORDER BY a;
 a	b	c

mysql-test/t/bdb_notembedded.test

+-- source include/not_embedded.inc
+-- source include/have_bdb.inc
+
+#
+# Bug #16206: Superfluous COMMIT event in binlog when updating BDB in autocommit mode
+#
+set autocommit=1;
+
+let $VERSION=`select version()`;
+
+reset master;
+create table bug16206 (a int);
+insert into bug16206 values(1);
+start transaction;
+insert into bug16206 values(2);
+commit;
+--replace_result $VERSION VERSION
+--replace_column 1 f 2 n 5 n
+show binlog events;
+drop table bug16206;
+
+reset master;
+create table bug16206 (a int) engine=         bdb;
+insert into bug16206 values(0);
+insert into bug16206 values(1);
+start transaction;
+insert into bug16206 values(2);
+commit;
+insert into bug16206 values(3);
+--replace_result $VERSION VERSION
+--replace_column 1 f 2 n 5 n
+show binlog events;
+drop table bug16206;
+
+set autocommit=0;
+
+
+--echo End of 5.0 tests

sql/log_event.h

@@ -809,6 +809,12 @@ public:
 
   bool cache_stmt;
 
+  /**
+    A storage to cache the global system variable's value.
+    Handling of a separate event will be governed its member.
+  */
+  ulong slave_exec_mode;
+
 #ifndef MYSQL_CLIENT
   THD* thd;
 

sql/mysql_priv.h

@@ -1813,6 +1813,7 @@ extern uint volatile thread_count, thread_running, global_read_lock;
 extern my_bool opt_sql_bin_update, opt_safe_user_create, opt_no_mix_types;
 extern my_bool opt_safe_show_db, opt_local_infile, opt_myisam_use_mmap;
 extern my_bool opt_slave_compressed_protocol, use_temp_pool;
+extern ulong slave_exec_mode_options;
 extern my_bool opt_readonly, lower_case_file_system;
 extern my_bool opt_enable_named_pipe, opt_sync_frm, opt_allow_suspicious_udfs;
 extern my_bool opt_secure_auth;

sql/mysqld.cc

@@ -445,6 +445,8 @@ ulong thread_stack, what_to_log;
 ulong query_buff_size, slow_launch_time, slave_open_temp_tables;
 ulong open_files_limit, max_binlog_size, max_relay_log_size;
 ulong slave_net_timeout, slave_trans_retries;
+ulong slave_exec_mode_options;
+const char *slave_exec_mode_str= "STRICT";
 ulong thread_cache_size=0, thread_pool_size= 0;
 ulong binlog_cache_size=0, max_binlog_cache_size=0;
 ulong query_cache_size=0;
@@ -5101,7 +5103,8 @@ enum options_mysqld
   OPT_SECURE_FILE_PRIV,
   OPT_MIN_EXAMINED_ROW_LIMIT,
   OPT_LOG_SLOW_SLAVE_STATEMENTS,
-  OPT_OLD_MODE
+  OPT_OLD_MODE,
+  OPT_SLAVE_EXEC_MODE
 };
 
 
@@ -5799,8 +5802,11 @@ replicating a LOAD DATA INFILE command.",
    (uchar**) &slave_load_tmpdir, (uchar**) &slave_load_tmpdir, 0, GET_STR_ALLOC,
    REQUIRED_ARG, 0, 0, 0, 0, 0, 0},
   {"slave-skip-errors", OPT_SLAVE_SKIP_ERRORS,
-   "Tells the slave thread to continue replication when a query returns an error from the provided list.",
+   "Tells the slave thread to continue replication when a query event returns an error from the provided list.",
    0, 0, 0, GET_STR, REQUIRED_ARG, 0, 0, 0, 0, 0, 0},
+  {"slave-exec-mode", OPT_SLAVE_EXEC_MODE,
+   "Modes for how replication events should be executed.  Legal values are STRICT (default) and IDEMPOTENT. In IDEMPOTENT mode, replication will not stop for operations that are idempotent. In STRICT mode, replication will stop on any unexpected difference between the master and the slave.",
+   (uchar**) &slave_exec_mode_str, (uchar**) &slave_exec_mode_str, 0, GET_STR, REQUIRED_ARG, 0, 0, 0, 0, 0, 0},
 #endif
   {"slow-query-log", OPT_SLOW_LOG,
    "Enable|disable slow query log", (uchar**) &opt_slow_log,
@@ -7109,6 +7115,9 @@ static void mysql_init_variables(void)
 
   /* Things with default values that are not zero */
   delay_key_write_options= (uint) DELAY_KEY_WRITE_ON;
+  slave_exec_mode_options= 0;
+  slave_exec_mode_options= (uint)
+    find_bit_type_or_exit(slave_exec_mode_str, &slave_exec_mode_typelib, NULL);
   opt_specialflag= SPECIAL_ENGLISH;
   unix_sock= ip_sock= INVALID_SOCKET;
   mysql_home_ptr= mysql_home;
@@ -7318,6 +7327,10 @@ mysqld_get_one_option(int optid,
   case OPT_SLAVE_SKIP_ERRORS:
     init_slave_skip_errors(argument);
     break;
+  case OPT_SLAVE_EXEC_MODE:
+    slave_exec_mode_options= (uint)
+      find_bit_type_or_exit(argument, &slave_exec_mode_typelib, "");
+    break;
 #endif
   case OPT_SAFEMALLOC_MEM_LIMIT:
 #if !defined(DBUG_OFF) && defined(SAFEMALLOC)
@@ -7863,6 +7876,8 @@ static void get_options(int *argc,char **argv)
   }
   /* Set global MyISAM variables from delay_key_write_options */
   fix_delay_key_write((THD*) 0, OPT_GLOBAL);
+  /* Set global slave_exec_mode from its option */
+  fix_slave_exec_mode(OPT_GLOBAL);
 
 #ifndef EMBEDDED_LIBRARY
   if (mysqld_chroot)

sql/rpl_rli.cc

@@ -1160,6 +1160,11 @@ void Relay_log_info::cleanup_context(THD *thd, bool error)
   close_thread_tables(thd);
   clear_tables_to_lock();
   clear_flag(IN_STMT);
+  /*
+    Cleanup for the flags that have been set at do_apply_event.
+  */
+  thd->options&= ~OPTION_NO_FOREIGN_KEY_CHECKS;
+  thd->options&= ~OPTION_RELAXED_UNIQUE_CHECKS;
   last_event_start_time= 0;
   DBUG_VOID_RETURN;
 }

sql/set_var.cc

@@ -88,6 +88,16 @@ TYPELIB delay_key_write_typelib=
   delay_key_write_type_names, NULL
 };
 
+const char *slave_exec_mode_names[]=
+{ "STRICT", "IDEMPOTENT", NullS };
+static const unsigned int slave_exec_mode_names_len[]=
+{ sizeof("STRICT") - 1, sizeof("IDEMPOTENT") - 1, 0 };
+TYPELIB slave_exec_mode_typelib=
+{
+  array_elements(slave_exec_mode_names)-1, "",
+  slave_exec_mode_names, (unsigned int *) slave_exec_mode_names_len
+};
+
 static int  sys_check_ftb_syntax(THD *thd,  set_var *var);
 static bool sys_update_ftb_syntax(THD *thd, set_var * var);
 static void sys_default_ftb_syntax(THD *thd, enum_var_type type);
@@ -408,6 +418,11 @@ static sys_var_const_str_ptr sys_secure_file_priv(&vars, "secure_file_priv",
 static sys_var_long_ptr	sys_server_id(&vars, "server_id", &server_id, fix_server_id);
 static sys_var_bool_ptr	sys_slave_compressed_protocol(&vars, "slave_compressed_protocol",
 						      &opt_slave_compressed_protocol);
+static sys_var_set_slave_mode slave_exec_mode(&vars,
+                                              "slave_exec_mode",
+                                              &slave_exec_mode_options,
+                                              &slave_exec_mode_typelib,
+                                              0);
 static sys_var_long_ptr	sys_slow_launch_time(&vars, "slow_launch_time",
 					     &slow_launch_time);
 static sys_var_thd_ulong	sys_sort_buffer(&vars, "sort_buffer_size",
@@ -981,6 +996,79 @@ extern void fix_delay_key_write(THD *thd, enum_var_type type)
   }
 }
 
+bool sys_var_set::update(THD *thd, set_var *var)
+{
+  *value= var->save_result.ulong_value;
+  return 0;
+};
+
+uchar *sys_var_set::value_ptr(THD *thd, enum_var_type type,
+                              LEX_STRING *base)
+{
+  char buff[256];
+  String tmp(buff, sizeof(buff), &my_charset_latin1);
+  ulong length;
+  ulong val= *value;
+
+  tmp.length(0);
+  for (uint i= 0; val; val>>= 1, i++)
+  {
+    if (val & 1)
+    {
+      tmp.append(enum_names->type_names[i],
+                 enum_names->type_lengths[i]);
+      tmp.append(',');
+    }
+  }
+
+  if ((length= tmp.length()))
+    length--;
+  return (uchar*) thd->strmake(tmp.ptr(), length);
+}
+
+void sys_var_set_slave_mode::set_default(THD *thd, enum_var_type type)
+{
+  slave_exec_mode_options= 0;
+  bit_do_set(slave_exec_mode_options, SLAVE_EXEC_MODE_STRICT);
+}
+
+bool sys_var_set_slave_mode::check(THD *thd, set_var *var)
+{
+  bool rc=  sys_var_set::check(thd, var);
+  if (!rc &&
+      bit_is_set(var->save_result.ulong_value, SLAVE_EXEC_MODE_STRICT) == 1 &&
+      bit_is_set(var->save_result.ulong_value, SLAVE_EXEC_MODE_IDEMPOTENT) == 1)
+  {
+    rc= true;
+    my_error(ER_SLAVE_AMBIGOUS_EXEC_MODE, MYF(0), "");
+  }
+  return rc;
+}
+
+bool sys_var_set_slave_mode::update(THD *thd, set_var *var)
+{
+  bool rc;
+  pthread_mutex_lock(&LOCK_global_system_variables);
+  rc= sys_var_set::update(thd, var);
+  pthread_mutex_unlock(&LOCK_global_system_variables);
+  return rc;
+}
+
+void fix_slave_exec_mode(enum_var_type type)
+{
+  DBUG_ENTER("fix_slave_exec_mode");
+  compile_time_assert(sizeof(slave_exec_mode_options) * CHAR_BIT
+                      > SLAVE_EXEC_MODE_LAST_BIT - 1);
+  if (bit_is_set(slave_exec_mode_options, SLAVE_EXEC_MODE_STRICT) == 1 &&
+      bit_is_set(slave_exec_mode_options, SLAVE_EXEC_MODE_IDEMPOTENT) == 1)
+  {
+    sql_print_error("Ambiguous slave modes combination."
+                    " STRICT will be used");
+    bit_do_clear(slave_exec_mode_options, SLAVE_EXEC_MODE_IDEMPOTENT);
+  }
+  if (bit_is_set(slave_exec_mode_options, SLAVE_EXEC_MODE_IDEMPOTENT) == 0)
+    bit_do_set(slave_exec_mode_options, SLAVE_EXEC_MODE_STRICT);
+}
 
 bool sys_var_thd_binlog_format::is_readonly() const
 {
@@ -3165,7 +3253,18 @@ int set_var::light_check(THD *thd)
   return 0;
 }
 
+/**
+  Update variable
 
+  @param   thd    thread handler
+  @returns 0|1    ok or	ERROR
+
+  @note ERROR can be only due to abnormal operations involving
+  the server's execution evironment such as
+  out of memory, hard disk failure or the computer blows up.
+  Consider set_var::check() method if there is a need to return
+  an error due to logics.
+*/
 int set_var::update(THD *thd)
 {
   if (!value)

sql/set_var.h

@@ -30,7 +30,8 @@ class sys_var_pluginvar; /* opaque */
 typedef struct system_variables SV;
 typedef struct my_locale_st MY_LOCALE;
 
-extern TYPELIB bool_typelib, delay_key_write_typelib, sql_mode_typelib;
+extern TYPELIB bool_typelib, delay_key_write_typelib, sql_mode_typelib,
+  slave_exec_mode_typelib;
 
 typedef int (*sys_check_func)(THD *,  set_var *);
 typedef bool (*sys_update_func)(THD *, set_var *);
@@ -771,6 +772,42 @@ public:
 };
 
 
+class sys_var_set :public sys_var
+{
+protected:
+  ulong *value;
+  TYPELIB *enum_names;
+public:
+  sys_var_set(sys_var_chain *chain, const char *name_arg, ulong *value_arg,
+              TYPELIB *typelib, sys_after_update_func func)
+    :sys_var(name_arg, func), value(value_arg), enum_names(typelib)
+  { chain_sys_var(chain); }
+  virtual bool check(THD *thd, set_var *var)
+  {
+    return check_set(thd, var, enum_names);
+  }
+  virtual void set_default(THD *thd, enum_var_type type)
+  {  
+    *value= 0;
+  }
+  bool update(THD *thd, set_var *var);
+  uchar *value_ptr(THD *thd, enum_var_type type, LEX_STRING *base);
+  bool check_update_type(Item_result type) { return 0; }
+  SHOW_TYPE show_type() { return SHOW_CHAR; }
+};
+
+class sys_var_set_slave_mode :public sys_var_set
+{
+public:
+  sys_var_set_slave_mode(sys_var_chain *chain, const char *name_arg,
+                         ulong *value_arg,
+                         TYPELIB *typelib, sys_after_update_func func) :
+    sys_var_set(chain, name_arg, value_arg, typelib, func) {}
+  void set_default(THD *thd, enum_var_type type);
+  bool check(THD *thd, set_var *var);
+  bool update(THD *thd, set_var *var);
+};
+
 class sys_var_log_output :public sys_var
 {
   ulong *value;
@@ -1189,6 +1226,7 @@ sys_var *find_sys_var(THD *thd, const char *str, uint length=0);
 int sql_set_variables(THD *thd, List<set_var_base> *var_list);
 bool not_all_support_one_shot(List<set_var_base> *var_list);
 void fix_delay_key_write(THD *thd, enum_var_type type);
+void fix_slave_exec_mode(enum_var_type type);
 ulong fix_sql_mode(ulong sql_mode);
 extern sys_var_const_str sys_charset_system;
 extern sys_var_str sys_init_connect;

sql/share/errmsg.txt

@@ -6112,3 +6112,5 @@ ER_TRG_CANT_OPEN_TABLE
 
 ER_CANT_CREATE_SROUTINE
   eng "Cannot create stored routine `%-.64s`. Check warnings"
+ER_SLAVE_AMBIGOUS_EXEC_MODE
+  eng "Ambiguous slave modes combination. %s"

sql/sql_class.h

@@ -38,6 +38,9 @@ enum enum_ha_read_modes { RFIRST, RNEXT, RPREV, RLAST, RKEY, RNEXT_SAME };
 enum enum_duplicates { DUP_ERROR, DUP_REPLACE, DUP_UPDATE };
 enum enum_delay_key_write { DELAY_KEY_WRITE_NONE, DELAY_KEY_WRITE_ON,
 			    DELAY_KEY_WRITE_ALL };
+enum enum_slave_exec_mode { SLAVE_EXEC_MODE_STRICT,
+                            SLAVE_EXEC_MODE_IDEMPOTENT,
+                            SLAVE_EXEC_MODE_LAST_BIT};
 enum enum_mark_columns
 { MARK_COLUMNS_NONE, MARK_COLUMNS_READ, MARK_COLUMNS_WRITE};