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Commit 5661e726 authored by Mats Kindahl's avatar Mats Kindahl
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BUG#29288: myisam transactions replicated to a transactional 

slave leaves slave unstable

Problem: when replicating from non-transactional to
transactional engine with autocommit off, no BEGIN/COMMIT
is written to the binlog. When the slave replicates, it
will start a transaction that never ends.

Fix: Force autocommit=on on slave by always replicating
autocommit=1 from the master.
parent 924b4be5
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mysql-test/suite/rpl_ndb/r/rpl_ndb_mixed_tables.result 0 → 100644
View file @ 5661e726
==== Initialization ====
stop slave;
drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
reset master;
reset slave;
drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
start slave;
---- setup master ----
CREATE TABLE myisam_innodb (a INT) ENGINE=MYISAM;
CREATE TABLE innodb_myisam (a INT) ENGINE=INNODB;
CREATE TABLE myisam_ndb (a INT) ENGINE=MYISAM;
CREATE TABLE ndb_myisam (a INT) ENGINE=NDB;
CREATE TABLE innodb_ndb (a INT) ENGINE=INNODB;
CREATE TABLE ndb_innodb (a INT) ENGINE=NDB;
SHOW CREATE TABLE myisam_innodb;
Table Create Table
myisam_innodb CREATE TABLE `myisam_innodb` (
`a` int(11) DEFAULT NULL
) ENGINE=MyISAM DEFAULT CHARSET=latin1
SHOW CREATE TABLE innodb_myisam;
Table Create Table
innodb_myisam CREATE TABLE `innodb_myisam` (
`a` int(11) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1
SHOW CREATE TABLE myisam_ndb;
Table Create Table
myisam_ndb CREATE TABLE `myisam_ndb` (
`a` int(11) DEFAULT NULL
) ENGINE=MyISAM DEFAULT CHARSET=latin1
SHOW CREATE TABLE ndb_myisam;
Table Create Table
ndb_myisam CREATE TABLE `ndb_myisam` (
`a` int(11) DEFAULT NULL
) ENGINE=ndbcluster DEFAULT CHARSET=latin1
SHOW CREATE TABLE innodb_ndb;
Table Create Table
innodb_ndb CREATE TABLE `innodb_ndb` (
`a` int(11) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1
SHOW CREATE TABLE ndb_innodb;
Table Create Table
ndb_innodb CREATE TABLE `ndb_innodb` (
`a` int(11) DEFAULT NULL
) ENGINE=ndbcluster DEFAULT CHARSET=latin1
---- setup slave with different engines ----
DROP TABLE myisam_innodb, innodb_myisam;
DROP TABLE myisam_ndb, ndb_myisam;
DROP TABLE innodb_ndb, ndb_innodb;
CREATE TABLE myisam_innodb (a INT) ENGINE=INNODB;
CREATE TABLE innodb_myisam (a INT) ENGINE=MYISAM;
CREATE TABLE myisam_ndb (a INT) ENGINE=NDB;
CREATE TABLE ndb_myisam (a INT) ENGINE=MYISAM;
CREATE TABLE innodb_ndb (a INT) ENGINE=NDB;
CREATE TABLE ndb_innodb (a INT) ENGINE=INNODB;
SHOW CREATE TABLE myisam_innodb;
Table Create Table
myisam_innodb CREATE TABLE `myisam_innodb` (
`a` int(11) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1
SHOW CREATE TABLE innodb_myisam;
Table Create Table
innodb_myisam CREATE TABLE `innodb_myisam` (
`a` int(11) DEFAULT NULL
) ENGINE=MyISAM DEFAULT CHARSET=latin1
SHOW CREATE TABLE myisam_ndb;
Table Create Table
myisam_ndb CREATE TABLE `myisam_ndb` (
`a` int(11) DEFAULT NULL
) ENGINE=ndbcluster DEFAULT CHARSET=latin1
SHOW CREATE TABLE ndb_myisam;
Table Create Table
ndb_myisam CREATE TABLE `ndb_myisam` (
`a` int(11) DEFAULT NULL
) ENGINE=MyISAM DEFAULT CHARSET=latin1
SHOW CREATE TABLE innodb_ndb;
Table Create Table
innodb_ndb CREATE TABLE `innodb_ndb` (
`a` int(11) DEFAULT NULL
) ENGINE=ndbcluster DEFAULT CHARSET=latin1
SHOW CREATE TABLE ndb_innodb;
Table Create Table
ndb_innodb CREATE TABLE `ndb_innodb` (
`a` int(11) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1
==== AUTOCOMMIT=0, transactions ====
---- COMMIT ----
SET AUTOCOMMIT = 0;
BEGIN;
INSERT INTO myisam_innodb VALUES (1);
INSERT INTO myisam_innodb VALUES (2);
COMMIT;
BEGIN;
INSERT INTO innodb_myisam VALUES (3);
INSERT INTO innodb_myisam VALUES (4);
COMMIT;
BEGIN;
INSERT INTO myisam_ndb VALUES (5);
INSERT INTO myisam_ndb VALUES (6);
COMMIT;
BEGIN;
INSERT INTO ndb_myisam VALUES (7);
INSERT INTO ndb_myisam VALUES (8);
COMMIT;
BEGIN;
INSERT INTO ndb_innodb VALUES (9);
INSERT INTO ndb_innodb VALUES (10);
COMMIT;
BEGIN;
INSERT INTO innodb_ndb VALUES (11);
INSERT INTO innodb_ndb VALUES (12);
COMMIT;
---- ROLLBACK ----
BEGIN;
INSERT INTO myisam_innodb VALUES (13);
INSERT INTO myisam_innodb VALUES (14);
ROLLBACK;
Warnings:
Warning 1196 Some non-transactional changed tables couldn't be rolled back
BEGIN;
INSERT INTO innodb_myisam VALUES (15);
INSERT INTO innodb_myisam VALUES (16);
ROLLBACK;
BEGIN;
INSERT INTO myisam_ndb VALUES (17);
INSERT INTO myisam_ndb VALUES (18);
ROLLBACK;
Warnings:
Warning 1196 Some non-transactional changed tables couldn't be rolled back
BEGIN;
INSERT INTO ndb_myisam VALUES (19);
INSERT INTO ndb_myisam VALUES (20);
ROLLBACK;
BEGIN;
INSERT INTO ndb_innodb VALUES (21);
INSERT INTO ndb_innodb VALUES (22);
ROLLBACK;
BEGIN;
INSERT INTO innodb_ndb VALUES (23);
INSERT INTO innodb_ndb VALUES (24);
ROLLBACK;
==== AUTOCOMMIT=1, transactions ====
---- COMMIT ----
SET AUTOCOMMIT = 1;
BEGIN;
INSERT INTO myisam_innodb VALUES (25);
INSERT INTO myisam_innodb VALUES (26);
COMMIT;
BEGIN;
INSERT INTO innodb_myisam VALUES (27);
INSERT INTO innodb_myisam VALUES (28);
COMMIT;
BEGIN;
INSERT INTO myisam_ndb VALUES (29);
INSERT INTO myisam_ndb VALUES (30);
COMMIT;
BEGIN;
INSERT INTO ndb_myisam VALUES (31);
INSERT INTO ndb_myisam VALUES (32);
COMMIT;
BEGIN;
INSERT INTO ndb_innodb VALUES (33);
INSERT INTO ndb_innodb VALUES (34);
COMMIT;
BEGIN;
INSERT INTO innodb_ndb VALUES (35);
INSERT INTO innodb_ndb VALUES (36);
COMMIT;
---- ROLLBACK ----
BEGIN;
INSERT INTO myisam_innodb VALUES (37);
INSERT INTO myisam_innodb VALUES (38);
ROLLBACK;
Warnings:
Warning 1196 Some non-transactional changed tables couldn't be rolled back
BEGIN;
INSERT INTO innodb_myisam VALUES (39);
INSERT INTO innodb_myisam VALUES (40);
ROLLBACK;
BEGIN;
INSERT INTO myisam_ndb VALUES (41);
INSERT INTO myisam_ndb VALUES (42);
ROLLBACK;
Warnings:
Warning 1196 Some non-transactional changed tables couldn't be rolled back
BEGIN;
INSERT INTO ndb_myisam VALUES (43);
INSERT INTO ndb_myisam VALUES (44);
ROLLBACK;
BEGIN;
INSERT INTO ndb_innodb VALUES (45);
INSERT INTO ndb_innodb VALUES (46);
ROLLBACK;
BEGIN;
INSERT INTO innodb_ndb VALUES (47);
INSERT INTO innodb_ndb VALUES (48);
ROLLBACK;
==== AUTOCOMMIT=1, single statements ====
INSERT INTO myisam_innodb VALUES (49);
INSERT INTO myisam_innodb VALUES (50);
INSERT INTO innodb_myisam VALUES (51);
INSERT INTO innodb_myisam VALUES (52);
INSERT INTO myisam_ndb VALUES (53);
INSERT INTO myisam_ndb VALUES (54);
INSERT INTO ndb_myisam VALUES (55);
INSERT INTO ndb_myisam VALUES (56);
INSERT INTO ndb_innodb VALUES (57);
INSERT INTO ndb_innodb VALUES (58);
INSERT INTO innodb_ndb VALUES (59);
INSERT INTO innodb_ndb VALUES (60);
==== AUTOCOMMIT=0, single statements, myisam on master ====
SET AUTOCOMMIT = 0;
INSERT INTO myisam_innodb VALUES (61);
INSERT INTO myisam_innodb VALUES (62);
INSERT INTO myisam_ndb VALUES (63);
INSERT INTO myisam_ndb VALUES (64);
==== Show results ====
SELECT * FROM myisam_innodb ORDER BY a;
a
1
2
13
14
25
26
37
38
49
50
61
62
SELECT * FROM innodb_myisam ORDER BY a;
a
3
4
27
28
51
52
SELECT * FROM myisam_ndb ORDER BY a;
a
5
6
17
18
29
30
41
42
53
54
63
64
SELECT * FROM ndb_myisam ORDER BY a;
a
7
8
31
32
55
56
SELECT * FROM innodb_ndb ORDER BY a;
a
11
12
35
36
59
60
SELECT * FROM ndb_innodb ORDER BY a;
a
9
10
33
34
57
58
Comparing tables master:test.myisam_innodb and slave:test.myisam_innodb
Comparing tables master:test.innodb_myisam and slave:test.innodb_myisam
Comparing tables master:test.myisam_ndb and slave:test.myisam_ndb
Comparing tables master:test.ndb_myisam and slave:test.ndb_myisam
Comparing tables master:test.innodb_ndb and slave:test.innodb_ndb
Comparing tables master:test.ndb_innodb and slave:test.ndb_innodb
==== Clean up ====
drop table myisam_innodb, innodb_myisam;
drop table myisam_ndb, ndb_myisam;
drop table innodb_ndb, ndb_innodb;
mysql-test/suite/rpl_ndb/t/rpl_ndb_mixed_tables-slave.opt 0 → 100644
View file @ 5661e726
--innodb --ndbcluster --replicate-ignore-table=mysql.ndb_apply_status
mysql-test/suite/rpl_ndb/t/rpl_ndb_mixed_tables.test 0 → 100644
View file @ 5661e726
# ==== Purpose ====
#
# Test replication of transactions on tables which have different
# engines on master and slave. This tests all combinations of innodb,
# myisam, and ndb.
#
# ==== Method ====
#
# Set up six tables, each being innodb, myisam, or innodb on master,
# and another of innodb, myisam, or innodb on slave. For each table,
# do the following:
#
# - committed and rollback'ed transactions, with autocommit on and
# off
# - non-transactions with autocommit on
# - non-transactions with autocommit off, where the master table is
# myisam.
#
# Note: we are running the slave with
# --replicate-ignore-table=mysql.ndb_apply_status . See BUG#34557 for
# explanation.
#
# ==== Related bugs ====
#
# BUG#26395: if crash during autocommit update to transactional table on master, slave fails
# BUG#29288: myisam transactions replicated to a transactional slave leaves slave unstable
# BUG#34557: Row-based replication from ndb to non-ndb gives error on slave
# BUG#34600: Rolled-back punch transactions not replicated correctly
#
# ==== Todo ====
#
# We should eventually try transactions touching two tables which are
# of different engines on the same server (so that we try, e.g. punch
# transactions; cf BUG#34600). However, that will make the test much
# bigger (9 master-slave engine combinations [myisam->myisam,
# myisam->ndb, etc]. To try all combinations of one or more such
# tables means 2^9-1=511 transactions. We need to multiplied by 5
# since we want to test committed/rollback'ed transactions
# with/without AUTOCOMMIT, as well as non-transactions with
# autocommit). We'd have to write a script to produce the test case.
--echo ==== Initialization ====
--source include/have_ndb.inc
--source include/have_innodb.inc
--source include/ndb_master-slave.inc
--echo ---- setup master ----
CREATE TABLE myisam_innodb (a INT) ENGINE=MYISAM;
CREATE TABLE innodb_myisam (a INT) ENGINE=INNODB;
CREATE TABLE myisam_ndb (a INT) ENGINE=MYISAM;
CREATE TABLE ndb_myisam (a INT) ENGINE=NDB;
CREATE TABLE innodb_ndb (a INT) ENGINE=INNODB;
CREATE TABLE ndb_innodb (a INT) ENGINE=NDB;
SHOW CREATE TABLE myisam_innodb;
SHOW CREATE TABLE innodb_myisam;
SHOW CREATE TABLE myisam_ndb;
SHOW CREATE TABLE ndb_myisam;
SHOW CREATE TABLE innodb_ndb;
SHOW CREATE TABLE ndb_innodb;
--echo ---- setup slave with different engines ----
sync_slave_with_master;
DROP TABLE myisam_innodb, innodb_myisam;
DROP TABLE myisam_ndb, ndb_myisam;
DROP TABLE innodb_ndb, ndb_innodb;
CREATE TABLE myisam_innodb (a INT) ENGINE=INNODB;
CREATE TABLE innodb_myisam (a INT) ENGINE=MYISAM;
CREATE TABLE myisam_ndb (a INT) ENGINE=NDB;
CREATE TABLE ndb_myisam (a INT) ENGINE=MYISAM;
CREATE TABLE innodb_ndb (a INT) ENGINE=NDB;
CREATE TABLE ndb_innodb (a INT) ENGINE=INNODB;
SHOW CREATE TABLE myisam_innodb;
SHOW CREATE TABLE innodb_myisam;
SHOW CREATE TABLE myisam_ndb;
SHOW CREATE TABLE ndb_myisam;
SHOW CREATE TABLE innodb_ndb;
SHOW CREATE TABLE ndb_innodb;
connection master;
--echo ==== AUTOCOMMIT=0, transactions ====
--echo ---- COMMIT ----
SET AUTOCOMMIT = 0;
BEGIN;
INSERT INTO myisam_innodb VALUES (1);
INSERT INTO myisam_innodb VALUES (2);
COMMIT;
sync_slave_with_master;
connection master;
BEGIN;
INSERT INTO innodb_myisam VALUES (3);
INSERT INTO innodb_myisam VALUES (4);
COMMIT;
sync_slave_with_master;
connection master;
BEGIN;
INSERT INTO myisam_ndb VALUES (5);
INSERT INTO myisam_ndb VALUES (6);
COMMIT;
sync_slave_with_master;
connection master;
BEGIN;
INSERT INTO ndb_myisam VALUES (7);
INSERT INTO ndb_myisam VALUES (8);
COMMIT;
sync_slave_with_master;
connection master;
BEGIN;
INSERT INTO ndb_innodb VALUES (9);
INSERT INTO ndb_innodb VALUES (10);
COMMIT;
sync_slave_with_master;
connection master;
BEGIN;
INSERT INTO innodb_ndb VALUES (11);
INSERT INTO innodb_ndb VALUES (12);
COMMIT;
sync_slave_with_master;
connection master;
--echo ---- ROLLBACK ----
BEGIN;
INSERT INTO myisam_innodb VALUES (13);
INSERT INTO myisam_innodb VALUES (14);
ROLLBACK;
sync_slave_with_master;
connection master;
BEGIN;
INSERT INTO innodb_myisam VALUES (15);
INSERT INTO innodb_myisam VALUES (16);
ROLLBACK;
sync_slave_with_master;
connection master;
BEGIN;
INSERT INTO myisam_ndb VALUES (17);
INSERT INTO myisam_ndb VALUES (18);
ROLLBACK;
sync_slave_with_master;
connection master;
BEGIN;
INSERT INTO ndb_myisam VALUES (19);
INSERT INTO ndb_myisam VALUES (20);
ROLLBACK;
sync_slave_with_master;
connection master;
BEGIN;
INSERT INTO ndb_innodb VALUES (21);
INSERT INTO ndb_innodb VALUES (22);
ROLLBACK;
sync_slave_with_master;
connection master;
BEGIN;
INSERT INTO innodb_ndb VALUES (23);
INSERT INTO innodb_ndb VALUES (24);
ROLLBACK;
sync_slave_with_master;
connection master;
--echo ==== AUTOCOMMIT=1, transactions ====
--echo ---- COMMIT ----
SET AUTOCOMMIT = 1;
BEGIN;
INSERT INTO myisam_innodb VALUES (25);
INSERT INTO myisam_innodb VALUES (26);
COMMIT;
sync_slave_with_master;
connection master;
BEGIN;
INSERT INTO innodb_myisam VALUES (27);
INSERT INTO innodb_myisam VALUES (28);
COMMIT;
sync_slave_with_master;
connection master;
BEGIN;
INSERT INTO myisam_ndb VALUES (29);
INSERT INTO myisam_ndb VALUES (30);
COMMIT;
sync_slave_with_master;
connection master;
BEGIN;
INSERT INTO ndb_myisam VALUES (31);
INSERT INTO ndb_myisam VALUES (32);
COMMIT;
sync_slave_with_master;
connection master;
BEGIN;
INSERT INTO ndb_innodb VALUES (33);
INSERT INTO ndb_innodb VALUES (34);
COMMIT;
sync_slave_with_master;
connection master;
BEGIN;
INSERT INTO innodb_ndb VALUES (35);
INSERT INTO innodb_ndb VALUES (36);
COMMIT;
sync_slave_with_master;
connection master;
--echo ---- ROLLBACK ----
BEGIN;
INSERT INTO myisam_innodb VALUES (37);
INSERT INTO myisam_innodb VALUES (38);
ROLLBACK;
sync_slave_with_master;
connection master;
BEGIN;
INSERT INTO innodb_myisam VALUES (39);
INSERT INTO innodb_myisam VALUES (40);
ROLLBACK;
sync_slave_with_master;
connection master;
BEGIN;
INSERT INTO myisam_ndb VALUES (41);
INSERT INTO myisam_ndb VALUES (42);
ROLLBACK;
sync_slave_with_master;
connection master;
BEGIN;
INSERT INTO ndb_myisam VALUES (43);
INSERT INTO ndb_myisam VALUES (44);
ROLLBACK;
sync_slave_with_master;
connection master;
BEGIN;
INSERT INTO ndb_innodb VALUES (45);
INSERT INTO ndb_innodb VALUES (46);
ROLLBACK;
sync_slave_with_master;
connection master;
BEGIN;
INSERT INTO innodb_ndb VALUES (47);
INSERT INTO innodb_ndb VALUES (48);
ROLLBACK;
sync_slave_with_master;
connection master;
--echo ==== AUTOCOMMIT=1, single statements ====
INSERT INTO myisam_innodb VALUES (49);
INSERT INTO myisam_innodb VALUES (50);
sync_slave_with_master;
connection master;
INSERT INTO innodb_myisam VALUES (51);
INSERT INTO innodb_myisam VALUES (52);
sync_slave_with_master;
connection master;
INSERT INTO myisam_ndb VALUES (53);
INSERT INTO myisam_ndb VALUES (54);
sync_slave_with_master;
connection master;
INSERT INTO ndb_myisam VALUES (55);
INSERT INTO ndb_myisam VALUES (56);
sync_slave_with_master;
connection master;
INSERT INTO ndb_innodb VALUES (57);
INSERT INTO ndb_innodb VALUES (58);
sync_slave_with_master;
connection master;
INSERT INTO innodb_ndb VALUES (59);
INSERT INTO innodb_ndb VALUES (60);
sync_slave_with_master;
connection master;
--echo ==== AUTOCOMMIT=0, single statements, myisam on master ====
SET AUTOCOMMIT = 0;
# This tests BUG#29288.
INSERT INTO myisam_innodb VALUES (61);
INSERT INTO myisam_innodb VALUES (62);
sync_slave_with_master;
connection master;
INSERT INTO myisam_ndb VALUES (63);
INSERT INTO myisam_ndb VALUES (64);
sync_slave_with_master;
connection master;
--echo ==== Show results ====
SELECT * FROM myisam_innodb ORDER BY a;
SELECT * FROM innodb_myisam ORDER BY a;
SELECT * FROM myisam_ndb ORDER BY a;
SELECT * FROM ndb_myisam ORDER BY a;
SELECT * FROM innodb_ndb ORDER BY a;
SELECT * FROM ndb_innodb ORDER BY a;
let $diff_table_1=master:test.myisam_innodb;
let $diff_table_2=slave:test.myisam_innodb;
source include/diff_tables.inc;
let $diff_table_1=master:test.innodb_myisam;
let $diff_table_2=slave:test.innodb_myisam;
source include/diff_tables.inc;
let $diff_table_1=master:test.myisam_ndb;
let $diff_table_2=slave:test.myisam_ndb;
source include/diff_tables.inc;
let $diff_table_1=master:test.ndb_myisam;
let $diff_table_2=slave:test.ndb_myisam;
source include/diff_tables.inc;
let $diff_table_1=master:test.innodb_ndb;
let $diff_table_2=slave:test.innodb_ndb;
source include/diff_tables.inc;
let $diff_table_1=master:test.ndb_innodb;
let $diff_table_2=slave:test.ndb_innodb;
source include/diff_tables.inc;
--echo ==== Clean up ====
drop table myisam_innodb, innodb_myisam;
drop table myisam_ndb, ndb_myisam;
drop table innodb_ndb, ndb_innodb;
sync_slave_with_master;
sql/log_event.cc
View file @ 5661e726
...@@ -2389,13 +2389,29 @@ Query_log_event::Query_log_event(THD* thd_arg, const char* query_arg, ...@@ -2389,13 +2389,29 @@ Query_log_event::Query_log_event(THD* thd_arg, const char* query_arg,
charset_database_number= thd_arg->variables.collation_database->number; charset_database_number= thd_arg->variables.collation_database->number;
/* /*
If we don't use flags2 for anything else than options contained in We only replicate over the bits of flags2 that we need: the rest
thd_arg->options, it would be more efficient to flags2=thd_arg->options are masked out by "& OPTIONS_WRITTEN_TO_BINLOG".
(OPTIONS_WRITTEN_TO_BIN_LOG would be used only at reading time).
But it's likely that we don't want to use 32 bits for 3 bits; in the future We also force AUTOCOMMIT=1. Rationale (cf. BUG#29288): After
we will probably want to reclaim the 29 bits. So we need the &. fixing BUG#26395, we always write BEGIN and COMMIT around all
transactions (even single statements in autocommit mode). This is
so that replication from non-transactional to transactional table
and error recovery from XA to non-XA table should work as
expected. The BEGIN/COMMIT are added in log.cc. However, there is
one exception: MyISAM bypasses log.cc and writes directly to the
binlog. So if autocommit is off, master has MyISAM, and slave has
a transactional engine, then the slave will just see one long
never-ending transaction. The only way to bypass explicit
BEGIN/COMMIT in the binlog is by using a non-transactional table.
So setting AUTOCOMMIT=1 will make this work as expected.
Note: explicitly replicate AUTOCOMMIT=1 from master. We do not
assume AUTOCOMMIT=1 on slave; the slave still reads the state of
the autocommit flag as written by the master to the binlog. This
behavior may change after WL#4162 has been implemented.
*/ */
flags2= (uint32) (thd_arg->options & OPTIONS_WRITTEN_TO_BIN_LOG); flags2= (uint32) (thd_arg->options &
(OPTIONS_WRITTEN_TO_BIN_LOG & ~OPTION_NOT_AUTOCOMMIT));
DBUG_ASSERT(thd_arg->variables.character_set_client->number < 256*256); DBUG_ASSERT(thd_arg->variables.character_set_client->number < 256*256);
DBUG_ASSERT(thd_arg->variables.collation_connection->number < 256*256); DBUG_ASSERT(thd_arg->variables.collation_connection->number < 256*256);
DBUG_ASSERT(thd_arg->variables.collation_server->number < 256*256); DBUG_ASSERT(thd_arg->variables.collation_server->number < 256*256);
......
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