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extend prelocking to FK-accessed tables

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Backport of f136291098
This commit is contained in:
Sergei Golubchik
2018-07-17 16:56:40 +02:00
parent 3b365fa829
commit 64a23c1c8a
6 changed files with 157 additions and 4 deletions
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48
mysql-test/suite/innodb/t/foreign-keys.test
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@ -1,6 +1,8 @@
--source include/have_innodb.inc
--source include/have_debug.inc
--enable_connect_log
--echo #
--echo # Bug #19471516 SERVER CRASHES WHEN EXECUTING ALTER TABLE
--echo # ADD FOREIGN KEY
@ -24,3 +26,49 @@ ALTER TABLE `title` ADD FOREIGN KEY (`title_reporter_fk`) REFERENCES `people`
(`people_id`);
drop table title, department, people;
#
# FK and prelocking:
# child table accesses (reads and writes) wait for locks.
#
create table t1 (a int primary key, b int) engine=innodb;
create table t2 (c int primary key, d int,
foreign key (d) references t1 (a) on update cascade) engine=innodb;
insert t1 values (1,1),(2,2),(3,3);
insert t2 values (4,1),(5,2),(6,3);
flush table t2 with read lock; # this takes MDL_SHARED_NO_WRITE
connect (con1,localhost,root);
--error ER_ROW_IS_REFERENCED_2
delete from t1 where a=2;
send update t1 set a=10 where a=1;
connection default;
let $wait_condition= select 1 from information_schema.processlist where state='Waiting for table metadata lock';
source include/wait_condition.inc;
unlock tables;
connection con1;
reap;
connection default;
lock table t2 write; # this takes MDL_SHARED_NO_READ_WRITE
connection con1;
send delete from t1 where a=2;
connection default;
let $wait_condition= select 1 from information_schema.processlist where state='Waiting for table metadata lock';
source include/wait_condition.inc;
unlock tables;
connection con1;
--error ER_ROW_IS_REFERENCED_2
reap;
connection default;
unlock tables;
disconnect con1;
# but privileges should not be checked
create user foo;
grant select,update on test.t1 to foo;
connect(foo,localhost,foo);
update t1 set a=30 where a=3;
disconnect foo;
connection default;
select * from t2;
drop table t2, t1;
drop user foo;