mariadb/mysql-test/t/events_2.test
Dmitry Lenev 378cdc58c1 Patch that refactors global read lock implementation and fixes
bug #57006 "Deadlock between HANDLER and FLUSH TABLES WITH READ
LOCK" and bug #54673 "It takes too long to get readlock for
'FLUSH TABLES WITH READ LOCK'".

The first bug manifested itself as a deadlock which occurred
when a connection, which had some table open through HANDLER
statement, tried to update some data through DML statement
while another connection tried to execute FLUSH TABLES WITH
READ LOCK concurrently.

What happened was that FTWRL in the second connection managed
to perform first step of GRL acquisition and thus blocked all
upcoming DML. After that it started to wait for table open
through HANDLER statement to be flushed. When the first connection
tried to execute DML it has started to wait for GRL/the second
connection creating deadlock.

The second bug manifested itself as starvation of FLUSH TABLES
WITH READ LOCK statements in cases when there was a constant
stream of concurrent DML statements (in two or more
connections).

This has happened because requests for protection against GRL
which were acquired by DML statements were ignoring presence of
pending GRL and thus the latter was starved.

This patch solves both these problems by re-implementing GRL
using metadata locks.

Similar to the old implementation acquisition of GRL in new
implementation is two-step. During the first step we block
all concurrent DML and DDL statements by acquiring global S
metadata lock (each DML and DDL statement acquires global IX
lock for its duration). During the second step we block commits
by acquiring global S lock in COMMIT namespace (commit code
acquires global IX lock in this namespace).

Note that unlike in old implementation acquisition of
protection against GRL in DML and DDL is semi-automatic.
We assume that any statement which should be blocked by GRL
will either open and acquires write-lock on tables or acquires
metadata locks on objects it is going to modify. For any such
statement global IX metadata lock is automatically acquired
for its duration.

The first problem is solved because waits for GRL become
visible to deadlock detector in metadata locking subsystem
and thus deadlocks like one in the first bug become impossible.

The second problem is solved because global S locks which
are used for GRL implementation are given preference over
IX locks which are acquired by concurrent DML (and we can
switch to fair scheduling in future if needed).

Important change:
FTWRL/GRL no longer blocks DML and DDL on temporary tables.
Before this patch behavior was not consistent in this respect:
in some cases DML/DDL statements on temporary tables were
blocked while in others they were not. Since the main use cases
for FTWRL are various forms of backups and temporary tables are
not preserved during backups we have opted for consistently
allowing DML/DDL on temporary tables during FTWRL/GRL.

Important change:
This patch changes thread state names which are used when
DML/DDL of FTWRL is waiting for global read lock. It is now
either "Waiting for global read lock" or "Waiting for commit
lock" depending on the stage on which FTWRL is.

Incompatible change:
To solve deadlock in events code which was exposed by this
patch we have to replace LOCK_event_metadata mutex with
metadata locks on events. As result we have to prohibit
DDL on events under LOCK TABLES.

This patch also adds extensive test coverage for interaction
of DML/DDL and FTWRL.

Performance of new and old global read lock implementations
in sysbench tests were compared. There were no significant
difference between new and old implementations.
2010-11-11 20:11:05 +03:00

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# changes 2008-02-20 hhunger splitted events.test into events_1 and events_2
#
# Can't test with embedded server that doesn't support grants
-- source include/not_embedded.inc
--disable_warnings
drop database if exists events_test;
--enable_warnings
create database events_test;
use events_test;
#
# mysql.event intact checking end
#
create event e_26 on schedule at '2017-01-01 00:00:00' disable do set @a = 5;
select db, name, body, definer, convert_tz(execute_at, 'UTC', 'SYSTEM'), on_completion from mysql.event;
drop event e_26;
--error ER_WRONG_VALUE
create event e_26 on schedule at NULL disable do set @a = 5;
--error ER_WRONG_VALUE
create event e_26 on schedule at 'definitely not a datetime' disable do set @a = 5;
set names utf8;
create event задачка on schedule every 123 minute starts now() ends now() + interval 1 month do select 1;
drop event задачка;
--echo "DISABLE the scheduler. Testing that it does not work when the variable is 0"
set global event_scheduler=off;
select definer, name, db from mysql.event;
select get_lock("test_lock1", 20);
create event закачка on schedule every 10 hour do select get_lock("test_lock1", 20);
--echo "Should return 1 row"
select definer, name, db from mysql.event;
--echo "Should be only 0 process"
select /*1*/ user, host, db, command, state, info
from information_schema.processlist
where (user='event_scheduler')
order by info;
select release_lock("test_lock1");
drop event закачка;
--echo "Should have 0 events"
select count(*) from mysql.event;
#
#
#
--echo "ENABLE the scheduler and get a lock"
set global event_scheduler=on;
select get_lock("test_lock2", 20);
--echo "Create an event which tries to acquire a mutex. The event locks on the mutex"
create event закачка on schedule every 10 hour do select get_lock("test_lock2", 20);
--echo "Should have only 2 processes: the scheduler and the locked event"
let $wait_condition= select count(*) = 2 from information_schema.processlist
where ( (state like 'User lock%' AND info like 'select get_lock%')
OR (command='Daemon' AND user='event_scheduler' AND
state = 'Waiting for next activation'));
--source include/wait_condition.inc
select /*2*/ user, host, db, command, state, info
from information_schema.processlist
where (info like "select get_lock%" OR user='event_scheduler')
order by info;
--echo "Release the mutex, the event worker should finish."
select release_lock("test_lock2");
drop event закачка;
# Wait for release_lock("test_lock2") to complete,
# to avoid polluting the next test information_schema.processlist
let $wait_condition= select count(*) = 0 from information_schema.processlist
where (state like 'User lock%' AND info like 'select get_lock%');
--source include/wait_condition.inc
##
## 1. get a lock
## 2. create an event
## 3. sleep so it has time to start
## 4. should appear in processlist
## 5. kill the scheduler, it will wait for the child to stop
## 6. both processes should be there on show processlist
## 7. release the lock and sleep, both scheduler and child should end
set global event_scheduler=1;
select get_lock("test_lock2_1", 20);
create event закачка21 on schedule every 10 hour do select get_lock("test_lock2_1", 20);
--echo "Should have only 2 processes: the scheduler and the locked event"
let $wait_condition= select count(*) = 2 from information_schema.processlist
where ( (state like 'User lock%' AND info like 'select get_lock%')
OR (command='Daemon' AND user='event_scheduler' AND
state = 'Waiting for next activation'));
--source include/wait_condition.inc
select /*3*/ user, host, db, command, state, info
from information_schema.processlist
where (info like "select get_lock%" OR user='event_scheduler')
order by info;
set global event_scheduler=off;
let $wait_condition= select count(*) =1 from information_schema.processlist
where (info like "select get_lock%" OR user='event_scheduler');
--source include/wait_condition.inc
--echo "Should have only our process now:"
select /*4*/ user, host, db, command, state, info
from information_schema.processlist
where (info like "select get_lock%" OR user='event_scheduler')
order by info;
select release_lock("test_lock2_1");
drop event закачка21;
let $wait_condition=
select count(*) = 0 from information_schema.processlist
where db='events_test' and command = 'Connect' and user=current_user();
--source include/wait_condition.inc
####
# Bug #16410 Events: CREATE EVENT is legal in a CREATE TRIGGER statement
#
create table t_16 (s1 int);
--error ER_EVENT_RECURSION_FORBIDDEN
create trigger t_16_bi before insert on t_16 for each row create event e_16 on schedule every 1 second do set @a=5;
drop table t_16;
#
# end of test case
####
#
# START: BUG #17453: Creating Event crash the server
#
create event white_space
on schedule every 10 hour
disable
do
select 1;
select event_schema, event_name, definer, event_definition from information_schema.events where event_name='white_space';
drop event white_space;
create event white_space on schedule every 10 hour disable do
select 2;
select event_schema, event_name, definer, event_definition from information_schema.events where event_name='white_space';
drop event white_space;
create event white_space on schedule every 10 hour disable do select 3;
select event_schema, event_name, definer, event_definition from information_schema.events where event_name='white_space';
drop event white_space;
#
# END: BUG #17453: Creating Event crash the server
#
#
# Bug#17403 "Events: packets out of order with show create event"
#
create event e1 on schedule every 1 year do set @a = 5;
create table t1 (s1 int);
--error ER_SP_NO_RETSET
create trigger t1_ai after insert on t1 for each row show create event e1;
drop table t1;
drop event e1;
##set global event_scheduler=1;
##select get_lock("test_lock3", 20);
##create event закачка on schedule every 10 hour do select get_lock("test_lock3", 20);
##select sleep(2);
##select /*5*/ user, host, db, command, state, info from information_schema.processlist where info is null or info not like '%processlist%' order by info;
##drop event закачка;
##select release_lock("test_lock3");
#
# test with very often occuring event
# (disabled for now, locks)
##select get_lock("test_lock4", 20);
##create event закачка4 on schedule every 1 second do select get_lock("test_lock4", 20);
##select sleep(3);
##select /*6*/ user, host, db, command, state, info from information_schema.processlist where info is null or info not like '%processlist%' order by info;
##drop event закачка4;
##select release_lock("test_lock4");
##set global event_scheduler=off;
##select sleep(2);
##--replace_column 1 # 6 #
##show processlist;
##select count(*) from mysql.event;
#
# Test wrong syntax
#
--error ER_WRONG_DB_NAME
SHOW EVENTS FROM aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa;
--error ER_WRONG_DB_NAME
SHOW EVENTS FROM ``;
SHOW EVENTS FROM `events\\test`;
#
# A check for events SQL under LOCK TABLES and in pre-locked mode.
#
--echo
--echo LOCK TABLES mode.
--echo
#
# SHOW CREATE EVENT and INFORMATION_SCHEMA.events are available and
# cause an implicit lock/unlock of mysql.event table, regardless of the
# currently locked tables.
#
create table t1 (a int);
create event e1 on schedule every 10 hour do select 1;
#
lock table t1 read;
#
--replace_regex /STARTS '[^']+'/STARTS '#'/
show create event e1;
select event_name from information_schema.events;
--error ER_LOCK_OR_ACTIVE_TRANSACTION
create event e2 on schedule every 10 hour do select 1;
--error ER_LOCK_OR_ACTIVE_TRANSACTION
alter event e2 disable;
--error ER_LOCK_OR_ACTIVE_TRANSACTION
alter event e2 rename to e3;
--error ER_LOCK_OR_ACTIVE_TRANSACTION
drop event e2;
--error ER_LOCK_OR_ACTIVE_TRANSACTION
drop event e1;
unlock tables;
#
lock table t1 write;
#
--replace_regex /STARTS '[^']+'/STARTS '#'/
show create event e1;
select event_name from information_schema.events;
--error ER_LOCK_OR_ACTIVE_TRANSACTION
create event e2 on schedule every 10 hour do select 1;
--error ER_LOCK_OR_ACTIVE_TRANSACTION
alter event e2 disable;
--error ER_LOCK_OR_ACTIVE_TRANSACTION
alter event e2 rename to e3;
--error ER_LOCK_OR_ACTIVE_TRANSACTION
drop event e2;
--error ER_LOCK_OR_ACTIVE_TRANSACTION
drop event e1;
unlock tables;
#
lock table t1 read, mysql.event read;
#
--replace_regex /STARTS '[^']+'/STARTS '#'/
show create event e1;
select event_name from information_schema.events;
--error ER_LOCK_OR_ACTIVE_TRANSACTION
create event e2 on schedule every 10 hour do select 1;
--error ER_LOCK_OR_ACTIVE_TRANSACTION
alter event e2 disable;
--error ER_LOCK_OR_ACTIVE_TRANSACTION
alter event e2 rename to e3;
--error ER_LOCK_OR_ACTIVE_TRANSACTION
drop event e2;
--error ER_LOCK_OR_ACTIVE_TRANSACTION
drop event e1;
unlock tables;
#
lock table t1 write, mysql.event read;
#
--replace_regex /STARTS '[^']+'/STARTS '#'/
show create event e1;
select event_name from information_schema.events;
--error ER_LOCK_OR_ACTIVE_TRANSACTION
create event e2 on schedule every 10 hour do select 1;
--error ER_LOCK_OR_ACTIVE_TRANSACTION
alter event e2 disable;
--error ER_LOCK_OR_ACTIVE_TRANSACTION
alter event e2 rename to e3;
--error ER_LOCK_OR_ACTIVE_TRANSACTION
drop event e2;
--error ER_LOCK_OR_ACTIVE_TRANSACTION
drop event e1;
unlock tables;
#
--error ER_WRONG_LOCK_OF_SYSTEM_TABLE
lock table t1 read, mysql.event write;
#
--error ER_WRONG_LOCK_OF_SYSTEM_TABLE
lock table t1 write, mysql.event write;
#
lock table mysql.event write;
--replace_regex /STARTS '[^']+'/STARTS '#'/
show create event e1;
select event_name from information_schema.events;
--error ER_LOCK_OR_ACTIVE_TRANSACTION
create event e2 on schedule every 10 hour do select 1;
--error ER_LOCK_OR_ACTIVE_TRANSACTION
alter event e2 disable;
--error ER_LOCK_OR_ACTIVE_TRANSACTION
alter event e2 rename to e3;
--error ER_LOCK_OR_ACTIVE_TRANSACTION
drop event e3;
--error ER_LOCK_OR_ACTIVE_TRANSACTION
drop event e1;
unlock tables;
drop event e1;
--echo Make sure we have left no events
select event_name from information_schema.events;
--echo
--echo Events in sub-statements, events and prelocking
--echo
--echo
create event e1 on schedule every 10 hour do select 1;
delimiter |;
--error ER_SP_NO_RETSET
create function f1() returns int
begin
show create event e1;
return 1;
end|
--error ER_SP_NO_RETSET
create trigger trg before insert on t1 for each row
begin
show create event e1;
end|
--error ER_SP_NO_RETSET
create function f1() returns int
begin
select event_name from information_schema.events;
return 1;
end|
--error ER_SP_NO_RETSET
create trigger trg before insert on t1 for each row
begin
select event_name from information_schema.events;
end|
--error ER_EVENT_RECURSION_FORBIDDEN
create function f1() returns int
begin
create event e2 on schedule every 10 hour do select 1;
return 1;
end|
--error ER_COMMIT_NOT_ALLOWED_IN_SF_OR_TRG
create function f1() returns int
begin
alter event e1 rename to e2;
return 1;
end|
--error ER_COMMIT_NOT_ALLOWED_IN_SF_OR_TRG
create function f1() returns int
begin
drop event e2;
return 1;
end|
--echo ----------------------------------------------------------------------
create trigger trg before insert on t1 for each row
begin
set new.a= f1();
end|
create function f1() returns int
begin
call p1();
return 0;
end|
create procedure p1()
begin
select event_name from information_schema.events;
end|
--error ER_SP_NO_RETSET
insert into t1 (a) values (1)|
drop procedure p1|
create procedure p1()
begin
show create event e1;
end|
--error ER_SP_NO_RETSET
insert into t1 (a) values (1)|
drop procedure p1|
create procedure p1()
begin
create temporary table tmp select event_name from information_schema.events;
end|
--echo expected to work, since we redirect the output into a tmp table
insert into t1 (a) values (1)|
select * from tmp|
drop temporary table tmp|
drop procedure p1|
create procedure p1()
begin
alter event e1 rename to e2;
end|
--error ER_COMMIT_NOT_ALLOWED_IN_SF_OR_TRG
insert into t1 (a) values (1)|
drop procedure p1|
create procedure p1()
begin
drop event e1;
end|
--error ER_COMMIT_NOT_ALLOWED_IN_SF_OR_TRG
insert into t1 (a) values (1)|
drop table t1|
drop event e1|
delimiter ;|
#
# Bug#21432 Database/Table name limited to 64 bytes, not chars, problems with multi-byte
#
set names utf8;
create event имя_события_в_кодировке_утф8_длиной_большеем_48 on schedule every 2 year do select 1;
select EVENT_NAME from information_schema.events
where event_schema='test';
drop event имя_события_в_кодировке_утф8_длиной_большеем_48;
--error 1059
create event
очень_очень_очень_очень_очень_очень_очень_очень_длинная_строка_66
on schedule every 2 year do select 1;
#
# Bug#35981: ALTER EVENT causes the server to change the PRESERVE option.
#
create event event_35981 on schedule every 6 month on completion preserve
disable
do
select 1;
echo The following SELECTs should all give 1;
# show current ON_COMPLETION
select count(*) from information_schema.events
where event_schema = database() and event_name = 'event_35981' and
on_completion = 'PRESERVE';
# show ON_COMPLETION remains "PRESERVE" when not given in ALTER EVENT
alter event event_35981 enable;
select count(*) from information_schema.events
where event_schema = database() and event_name = 'event_35981' and
on_completion = 'PRESERVE';
# show we can change ON_COMPLETION
alter event event_35981 on completion not preserve;
select count(*) from information_schema.events
where event_schema = database() and event_name = 'event_35981' and
on_completion = 'NOT PRESERVE';
# show ON_COMPLETION remains "NOT PRESERVE" when not given in ALTER EVENT
alter event event_35981 disable;
select count(*) from information_schema.events
where event_schema = database() and event_name = 'event_35981' and
on_completion = 'NOT PRESERVE';
# show we can change ON_COMPLETION
alter event event_35981 on completion preserve;
select count(*) from information_schema.events
where event_schema = database() and event_name = 'event_35981' and
on_completion = 'PRESERVE';
drop event event_35981;
create event event_35981 on schedule every 6 month disable
do
select 1;
# show that the defaults for CREATE EVENT are still correct (NOT PRESERVE)
select count(*) from information_schema.events
where event_schema = database() and event_name = 'event_35981' and
on_completion = 'NOT PRESERVE';
drop event event_35981;
# show that backdating doesn't break
create event event_35981 on schedule every 1 hour starts current_timestamp
on completion not preserve
do
select 1;
# should fail thanks to above's NOT PRESERVE
--error ER_EVENT_CANNOT_ALTER_IN_THE_PAST
alter event event_35981 on schedule every 1 hour starts '1999-01-01 00:00:00'
ends '1999-01-02 00:00:00';
drop event event_35981;
create event event_35981 on schedule every 1 hour starts current_timestamp
on completion not preserve
do
select 1;
# succeed with warning
alter event event_35981 on schedule every 1 hour starts '1999-01-01 00:00:00'
ends '1999-01-02 00:00:00' on completion preserve;
drop event event_35981;
create event event_35981 on schedule every 1 hour starts current_timestamp
on completion preserve
do
select 1;
# this should succeed thanks to above PRESERVE! give a warning though.
alter event event_35981 on schedule every 1 hour starts '1999-01-01 00:00:00'
ends '1999-01-02 00:00:00';
# this should fail, as the event would have passed already
--error ER_EVENT_CANNOT_ALTER_IN_THE_PAST
alter event event_35981 on schedule every 1 hour starts '1999-01-01 00:00:00'
ends '1999-01-02 00:00:00' on completion not preserve;
# should succeed giving a warning
alter event event_35981 on schedule every 1 hour starts '1999-01-01 00:00:00'
ends '1999-01-02 00:00:00' on completion preserve;
drop event event_35981;
#
# End of tests
#
let $wait_condition=
select count(*) = 0 from information_schema.processlist
where db='events_test' and command = 'Connect' and user=current_user();
--source include/wait_condition.inc
drop database events_test;