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WL#5151: Conversion between different types when replicating

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Row-based replication requires the types of columns on the
master and slave to be approximately the same (some safe
conversions between strings are allowed), but does not
allow safe conversions between fields of similar types such
as TINYINT and INT.

This patch implement type conversions between similar fields
on the master and slave.

The conversions are controlled using a new variable
SLAVE_TYPE_CONVERSIONS of type SET('ALL_LOSSY','ALL_NON_LOSSY').

Non-lossy conversions are any conversions that do not run the
risk of losing any information, while lossy conversions can
potentially truncate the value. The column definitions are
checked to decide if the conversion is acceptable.

If neither conversion is enabled, it is required that the
definitions of the columns are identical on master and slave.

Conversion is done by creating an internal conversion table,
unpacking the master data into it, and then copy the data to
the real table on the slave.
This commit is contained in:
Mats Kindahl
2009-12-14 12:04:55 +01:00
parent c7a02cf807
commit c63df11f37
39 changed files with 2893 additions and 464 deletions
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18
mysql-test/suite/rpl/r/rpl_row_basic_3innodb.result
View File

@@ -354,6 +354,8 @@ X Q 5 7 R 49 X Y 2 S 1
X Q 5 7 R 49 X Z 2 S 2
X Q 5 9 R 81 X Y 2 S 1
X Q 5 9 R 81 X Z 2 S 2
SET @saved_slave_type_conversions = @@SLAVE_TYPE_CONVERSIONS;
SET GLOBAL SLAVE_TYPE_CONVERSIONS = 'ALL_LOSSY';
CREATE TABLE t4 (C1 CHAR(1) PRIMARY KEY, B1 BIT(1), B2 BIT(1) NOT NULL DEFAULT 0, C2 CHAR(1) NOT NULL DEFAULT 'A') ENGINE = 'INNODB' ;
INSERT INTO t4 SET C1 = 1;
SELECT C1,HEX(B1),HEX(B2) FROM t4 ORDER BY C1;
@@ -362,6 +364,7 @@ C1 HEX(B1) HEX(B2)
SELECT C1,HEX(B1),HEX(B2) FROM t4 ORDER BY C1;
C1 HEX(B1) HEX(B2)
1 NULL 0
SET GLOBAL SLAVE_TYPE_CONVERSIONS = @saved_slave_type_conversions;
CREATE TABLE t7 (C1 INT PRIMARY KEY, C2 INT) ENGINE = 'INNODB' ;
--- on slave: original values ---
INSERT INTO t7 VALUES (1,3), (2,6), (3,9);
@@ -476,6 +479,8 @@ ALTER TABLE t6 MODIFY c CHAR(128) CHARACTER SET utf8 NOT NULL;
CREATE TABLE t7 (i INT NOT NULL,
c CHAR(255) CHARACTER SET utf8 NOT NULL,
j INT NOT NULL) ENGINE = 'INNODB' ;
SET @saved_slave_type_conversions = @@slave_type_conversions;
SET GLOBAL SLAVE_TYPE_CONVERSIONS = 'ALL_NON_LOSSY';
[expecting slave to replicate correctly]
INSERT INTO t1 VALUES (1, "", 1);
INSERT INTO t1 VALUES (2, repeat(_utf8'a', 16), 2);
@@ -484,11 +489,7 @@ Comparing tables master:test.t1 and slave:test.t1
INSERT INTO t2 VALUES (1, "", 1);
INSERT INTO t2 VALUES (2, repeat(_utf8'a', 16), 2);
Comparing tables master:test.t2 and slave:test.t2
[expecting slave to stop]
INSERT INTO t3 VALUES (1, "", 1);
INSERT INTO t3 VALUES (2, repeat(_utf8'a', 128), 2);
Last_SQL_Error
Table definition on master and slave does not match: Column 1 size mismatch - master has size 384, test.t3 on slave has size 49. Master's column size should be <= the slave's column size.
SET GLOBAL SLAVE_TYPE_CONVERSIONS = @saved_slave_type_conversions;
RESET MASTER;
STOP SLAVE;
RESET SLAVE;
@@ -501,7 +502,7 @@ Comparing tables master:test.t4 and slave:test.t4
INSERT INTO t5 VALUES (1, "", 1);
INSERT INTO t5 VALUES (2, repeat(_utf8'a', 255), 2);
Last_SQL_Error
Table definition on master and slave does not match: Column 1 size mismatch - master has size 765, test.t5 on slave has size 49. Master's column size should be <= the slave's column size.
Column 1 of table 'test.t5' cannot be converted from type 'char(255)' to type 'char(16)'
RESET MASTER;
STOP SLAVE;
RESET SLAVE;
@@ -510,7 +511,7 @@ START SLAVE;
INSERT INTO t6 VALUES (1, "", 1);
INSERT INTO t6 VALUES (2, repeat(_utf8'a', 255), 2);
Last_SQL_Error
Table definition on master and slave does not match: Column 1 size mismatch - master has size 765, test.t6 on slave has size 385. Master's column size should be <= the slave's column size.
Column 1 of table 'test.t6' cannot be converted from type 'char(255)' to type 'char(128)'
RESET MASTER;
STOP SLAVE;
RESET SLAVE;
@@ -597,6 +598,8 @@ UPDATE t1 SET a = 0 WHERE a < 4;
UPDATE t1 SET a = 8 WHERE a < 5;
Comparing tables master:test.t1 and slave:test.t1
drop table t1;
SET @saved_slave_type_conversions = @@SLAVE_TYPE_CONVERSIONS;
SET GLOBAL SLAVE_TYPE_CONVERSIONS = 'ALL_LOSSY';
CREATE TABLE t1 (a bit) ENGINE='INNODB' ;
INSERT IGNORE INTO t1 VALUES (NULL);
INSERT INTO t1 ( a ) VALUES ( 0 );
@@ -637,5 +640,6 @@ DELETE FROM t1 WHERE a < 3 LIMIT 0;
UPDATE t1 SET a = 8 WHERE a = 5 LIMIT 2;
INSERT INTO t1 ( a ) VALUES ( 1 );
UPDATE t1 SET a = 9 WHERE a < 5 LIMIT 3;
SET GLOBAL SLAVE_TYPE_CONVERSIONS = @saved_slave_type_conversions;
Comparing tables master:test.t1 and slave:test.t1
drop table t1;