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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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39
mysql-test/extra/rpl_tests/rpl_row_basic.test
View File

@ -6,6 +6,7 @@
# First we test tables with only an index.
#
connection master;
eval CREATE TABLE t1 (C1 CHAR(1), C2 CHAR(1), INDEX (C1)$extra_index_t1) ENGINE = $type ;
SELECT * FROM t1;
sync_slave_with_master;
@ -156,6 +157,12 @@ SELECT * FROM t5,t2,t3 WHERE t5.C2='Q' AND t2.c12='R' AND t3.C3 ='S' ORDER BY t5
# Testing special column types
#
if (`select char_length('$bit_field_special') > 0`) {
SET @saved_slave_type_conversions = @@SLAVE_TYPE_CONVERSIONS;
connection slave;
eval SET GLOBAL SLAVE_TYPE_CONVERSIONS = '$bit_field_special';
}
connection master;
eval 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 = $type ;
@ -164,6 +171,10 @@ SELECT C1,HEX(B1),HEX(B2) FROM t4 ORDER BY C1;
sync_slave_with_master;
SELECT C1,HEX(B1),HEX(B2) FROM t4 ORDER BY C1;
if (`select char_length('$bit_field_special') > 0`) {
SET GLOBAL SLAVE_TYPE_CONVERSIONS = @saved_slave_type_conversions;
}
#
# Testing conflicting operations
#
@ -350,6 +361,10 @@ eval CREATE TABLE t7 (i INT NOT NULL,
c CHAR(255) CHARACTER SET utf8 NOT NULL,
j INT NOT NULL) ENGINE = $type ;
connection slave;
SET @saved_slave_type_conversions = @@slave_type_conversions;
SET GLOBAL SLAVE_TYPE_CONVERSIONS = 'ALL_NON_LOSSY';
--echo [expecting slave to replicate correctly]
connection master;
INSERT INTO t1 VALUES (1, "", 1);
@ -370,17 +385,9 @@ let $diff_table_1=master:test.t2;
let $diff_table_2=slave:test.t2;
source include/diff_tables.inc;
--echo [expecting slave to stop]
connection master;
INSERT INTO t3 VALUES (1, "", 1);
INSERT INTO t3 VALUES (2, repeat(_utf8'a', 128), 2);
connection slave;
source include/wait_for_slave_sql_to_stop.inc;
let $last_error = query_get_value("SHOW SLAVE STATUS", Last_SQL_Error, 1);
disable_query_log;
eval SELECT "$last_error" AS Last_SQL_Error;
enable_query_log;
SET GLOBAL SLAVE_TYPE_CONVERSIONS = @saved_slave_type_conversions;
connection master;
RESET MASTER;
connection slave;
@ -600,7 +607,15 @@ sync_slave_with_master;
connection master;
# Since t1 contain a bit field, we have to do this trick to handle InnoDB
if (`select char_length('$bit_field_special') > 0`) {
SET @saved_slave_type_conversions = @@SLAVE_TYPE_CONVERSIONS;
connection slave;
eval SET GLOBAL SLAVE_TYPE_CONVERSIONS = '$bit_field_special';
}
--disable_warnings
connection master;
eval CREATE TABLE t1 (a bit) ENGINE=$type;
INSERT IGNORE INTO t1 VALUES (NULL);
INSERT INTO t1 ( a ) VALUES ( 0 );
@ -645,6 +660,10 @@ UPDATE t1 SET a = 9 WHERE a < 5 LIMIT 3;
sync_slave_with_master;
if (`select char_length('$bit_field_special') > 0`) {
SET GLOBAL SLAVE_TYPE_CONVERSIONS = @saved_slave_type_conversions;
}
let $diff_table_1=master:test.t1;
let $diff_table_2=slave:test.t1;
source include/diff_tables.inc;