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284c72eacf
Problem:-
When mysql executes INSERT ON DUPLICATE KEY INSERT, the storage engine checks
if the inserted row would generate a duplicate key error. If yes, it returns
the existing row to mysql, mysql updates it and sends it back to the storage
engine.When the table has more than one unique or primary key, this statement
is sensitive to the order in which the storage engines checks the keys.
Depending on this order, the storage engine may determine different rows
to mysql, and hence mysql can update different rows.The order that the
storage engine checks keys is not deterministic. For example, InnoDB checks
keys in an order that depends on the order in which indexes were added to
the table. The first added index is checked first. So if master and slave
have added indexes in different orders, then slave may go out of sync.
Solution:-
Make INSERT...ON DUPLICATE KEY UPDATE unsafe while using stmt or mixed format
When there is more then one unique key.
Although there is two exception.
1. Auto Increment key is not counted because Innodb will get gap lock for
failed Insert and concurrent insert will get a next increment value. But if
user supplies auto inc value it can be unsafe.
2. Count only unique keys for which insertion is performed.
So this patch also addresses the bug id #72921
122 lines
3.5 KiB
Plaintext
122 lines
3.5 KiB
Plaintext
source include/have_debug.inc;
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source include/have_innodb.inc;
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-- source include/have_binlog_format_statement.inc
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source include/master-slave.inc;
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# MDEV-17614
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# INSERT on dup key update is replication unsafe
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# There can be three case
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# 1. 2 unique key, Replication is unsafe.
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# 2. 2 unique key , with one auto increment key, Safe to replicate because Innodb will acquire gap lock
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# 3. n no of unique keys (n>1) but insert is only in 1 unique key
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# 4. 2 unique key , with one auto increment key(but user gives auto inc value), unsafe to replicate
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# Case 1
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call mtr.add_suppression("Unsafe statement written to the binary log using statement format");
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CREATE TABLE t1 (a INT NOT NULL PRIMARY KEY , b INT,
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UNIQUE(b), c int) engine=innodb;
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sync_slave_with_master;
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connection master;
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INSERT INTO t1 VALUES (1, 1, 1);
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BEGIN;
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INSERT INTO t1 VALUES (2, 1, 2) ON DUPLICATE KEY UPDATE b=VALUES(b), c=VALUES(c);
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--connection master1
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INSERT INTO t1 VALUES(2, 2, 3) ON DUPLICATE KEY UPDATE b=VALUES(b), c=VALUES(c);
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--connection master
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COMMIT;
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SELECT * FROM t1;
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--connection slave
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# show the error message
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--let $slave_sql_errno= 1062
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--let $show_slave_sql_error= 1
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--source include/wait_for_slave_sql_error.inc
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--echo #Different value from server
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SELECT * FROM t1;
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# restart replication for the next testcase
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stop slave;
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--source include/wait_for_slave_to_stop.inc
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reset slave;
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connection master;
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reset master;
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drop table t1;
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connection slave;
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start slave;
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--source include/wait_for_slave_to_start.inc
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# Case 2
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--connection master
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CREATE TABLE t1 (a INT NOT NULL PRIMARY KEY auto_increment, b INT,
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UNIQUE(b), c int) engine=innodb;
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sync_slave_with_master;
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connection master;
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INSERT INTO t1 VALUES (default, 1, 1);
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BEGIN;
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INSERT INTO t1 VALUES (default, 1, 2) ON DUPLICATE KEY UPDATE b=VALUES(b), c=VALUES(c);
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--connection master1
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INSERT INTO t1 VALUES(default, 2, 3) ON DUPLICATE KEY UPDATE b=VALUES(b), c=VALUES(c);
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--connection master
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COMMIT;
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SELECT * FROM t1;
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--sync_slave_with_master
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--echo #same data as master
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SELECT * FROM t1;
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connection master;
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drop table t1;
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--sync_slave_with_master
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# Case 3
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--connection master
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CREATE TABLE t1 (a INT NOT NULL PRIMARY KEY, b INT,
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UNIQUE(b), c int, d int ) engine=innodb;
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sync_slave_with_master;
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connection master;
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INSERT INTO t1 VALUES (1, 1, 1, 1);
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BEGIN;
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INSERT INTO t1 VALUES (2, NULL, 2, 2) ON DUPLICATE KEY UPDATE b=VALUES(b), c=VALUES(c);
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--connection master1
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INSERT INTO t1 VALUES(3, NULL, 2, 3) ON DUPLICATE KEY UPDATE b=VALUES(b), c=VALUES(c);
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--connection master
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COMMIT;
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SELECT * FROM t1;
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--sync_slave_with_master
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--echo #same data as master
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SELECT * FROM t1;
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connection master;
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drop table t1;
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--sync_slave_with_master
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# Case 4
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--connection master
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CREATE TABLE t1 (a INT NOT NULL PRIMARY KEY auto_increment, b INT,
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UNIQUE(b), c int) engine=innodb;
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sync_slave_with_master;
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connection master;
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INSERT INTO t1 VALUES (1, 1, 1);
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BEGIN;
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INSERT INTO t1 VALUES (2, 1, 2) ON DUPLICATE KEY UPDATE b=VALUES(b), c=VALUES(c);
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--connection master1
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INSERT INTO t1 VALUES(2, 2, 3) ON DUPLICATE KEY UPDATE b=VALUES(b), c=VALUES(c);
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--connection master
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COMMIT;
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SELECT * FROM t1;
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--connection slave
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# show the error message
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--let $slave_sql_errno= 1062
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--let $show_slave_sql_error= 1
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--source include/wait_for_slave_sql_error.inc
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--echo #Different value from server
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SELECT * FROM t1;
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# restart replication for the next testcase
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stop slave;
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--source include/wait_for_slave_to_stop.inc
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reset slave;
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connection master;
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reset master;
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drop table t1;
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connection slave;
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start slave;
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--source include/wait_for_slave_to_start.inc
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--source include/rpl_end.inc
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