fix for bug #17619 Scheduler race conditions

- Scheduler is either initialized at server start or never.
  Starting & stopping is now suspending & resuming.
- The scheduler has clear OO interface
- Now all calls to the scheduler are synchronous
- GLOBAL event_scheduler uses thd::sys_var_tmp (see set_var.cc)
- External API is encapsulated into class Events
- Includes fixes for all comments of Kostja's review of 19.05.2005

Starting to merge into 5.1-release (5.1.10) and push


BitKeeper/etc/ignore:
  Added libmysqld/event_scheduler.cc to the ignore list
libmysqld/Makefile.am:
  executor -> scheduler
mysql-test/r/events.result:
  update result
mysql-test/r/events_bugs.result:
  update result
mysql-test/r/events_logs_tests.result:
  update result
mysql-test/r/events_microsec.result:
  update result
mysql-test/r/events_scheduling.result:
  update result
mysql-test/r/events_stress.result:
  update result
mysql-test/t/disabled.def:
  enable these tests
mysql-test/t/events.test:
  optimize the test a bit for speed, save some seconds runtime
  remove FULL from SHOW EVENTS
  mostly use I_S.EVENTS
mysql-test/t/events_bugs.test:
  Skip irrelevant for the current design tests - all events are loaded
  on server startup. Change in mysql.event will be visible on next server start.
  Don't use numeric error codes.
mysql-test/t/events_logs_tests.test:
  optimize the test a bit for speed
mysql-test/t/events_microsec.test:
   Skip irrelevant for the current design tests - all events are loaded
      on server startup. Change in mysql.event will be visible on next server start.
      Don't use numeric error codes.
mysql-test/t/events_scheduling.test:
  broader test
mysql-test/t/events_stress.test:
  Rework the test to the new architecture of suspending/resuming.
  Use less events, no need for thousands, hundreds is still ok.
sql/Makefile.am:
  executor -> scheduler
sql/cmakelists.txt:
  executor -> scheduler
sql/event.cc:
  - remove todo comments
  - remove unneded evex_queue abstraction functions
  - move events_init() and events_shutdown() from event_executor.cc to here
  - export db_create_event
  - remove evex_load_and_compile_event, part of class Event_scheduler
  - integrate the public interface found in event.h and used by sql_parse.cc
    to use the new class Event_scheduler.
sql/event.h:
  - add COND_finished so if one thread kills a running event it waits on this
  - export callback event_timed_definer_equal, event_timed_identifier_equal(),
    event_timed_name_equal and event_timed_db_equal()
    to be used by Event_scheduler::drop_matching_events()
  - cleanup event.h
  - encapsulated all external interface into class Events
sql/event_executor.cc:
  make it empty, will delete after that
sql/event_priv.h:
  - more things in the private header
  - remove event queue abstraction functions. tightly bind to QUEUE
  - export privately db_drop_event, db_find_event, db_create_event()
  - made change_security_context() and restore_security_context() free functions
sql/event_timed.cc:
  - fix calculation of time when ENDS is set (STARTS is always set)
  - during Event_timed::compile() set the right Security_ctx. Prevents a crash
        during Event_scheduler::load_events_from_db()
  - add Event_timed::kill_thread()
  - implement event_timed_*_equal()
  - made change_security_context() and restore_security_context() free functions.
  - Comments cleanups
sql/lex.h:
  new word scheduler for SHOW SCHEDULER STATUS (available only debug builds)
sql/log.cc:
  move these from event_scheduler.cc
sql/mysql_priv.h:
  refactor kill_one_thread
  export sql_print_message_func and sql_print_message_handlers
sql/mysqld.cc:
  In close_connections, called by kill_server() skip the main scheduler
  thread and use events_shutdown() for shutting down the scheduler, in the same
  manner it's done for RPL.
  Add a new value to --event-scheduler :
  0 <- No scheduler available
  1 <- Start with scheduler enabled
  2 <- Start with scheduler suspended
sql/repl_failsafe.cc:
  refactor thd::system_thread to be an enum
sql/set_var.cc:
  move sys_var_event_executor::update() to set_var.cc
  executor -> scheduler
  use thd::sys_var_tmp
sql/set_var.h:
  executor -> scheduler
sql/share/errmsg.txt:
  3 new error messages
sql/sql_class.cc:
  refactor thd::system_thread to be an enum . more type-safety
sql/sql_class.h:
  refactor thd::system_thread to be an enum . more type-safety
sql/sql_db.cc:
  get the error from evex_drop_schema_events
sql/sql_error.h:
  export warning_level_names
sql/sql_lex.h:
  new command SHOW SCHEDULER STATUS, available only in debug build and
  for debug purposes.
sql/sql_parse.cc:
  refactor kill_one_thread() -> does the *dirty* work, and sql_kill
  just the reporting.
  add handler for SQLCOM_SHOW_SCHEDULER_STATUS
sql/sql_show.cc:
  fix verbosity handling (this will be obsoleted anyway by the fix for 17394).
sql/sql_yacc.yy:
  remove FULL from SHOW EVENTS
  add SHOW SCHEDULER STATUS in debug builds
sql/table.cc:
  Fix valgrind warning.

6 files changed, 89 insertions, 118 deletions

diff --git a/mysql-test/r/events.result b/mysql-test/r/events.result
index 01d206be7cb..d02a2af3c9f 100644
--- a/mysql-test/r/events.result
+++ b/mysql-test/r/events.result
@@ -17,13 +17,13 @@ db_x
 SHOW TABLES FROM db_x;
 Tables_in_db_x
 x_table
-SET GLOBAL event_scheduler=0;
+SET GLOBAL event_scheduler=2;
 DROP EVENT e_x1;
 DROP EVENT e_x2;
 DROP DATABASE db_x;
 DROP USER pauline@localhost;
 USE events_test;
-SET GLOBAL event_scheduler=0;
+SET GLOBAL event_scheduler=2;
 drop event if exists event1;
 Warnings:
 Note	1305	Event event1 does not exist
@@ -100,7 +100,7 @@ a
 800219
 drop event non_qualif_ev;
 drop table non_qualif;
-set global event_scheduler = 0;
+set global event_scheduler = 2;
 create table t_event3 (a int, b float);
 drop event if exists event3;
 Warnings:
@@ -324,18 +324,18 @@ events_test	one_event	ev_test@localhost	RECURRING	NULL	20	SECOND	#	#	ENABLED
 events_test	three_event	ev_test@localhost	RECURRING	NULL	20	SECOND	#	#	ENABLED
 events_test	two_event	ev_test@localhost	RECURRING	NULL	20	SECOND	#	#	ENABLED
 "This should show us only 3 events:";
-SHOW FULL EVENTS;
+SHOW EVENTS;
 Db	Name	Definer	Type	Execute at	Interval value	Interval field	Starts	Ends	Status
 events_test	one_event	ev_test@localhost	RECURRING	NULL	20	SECOND	#	#	ENABLED
 events_test	three_event	ev_test@localhost	RECURRING	NULL	20	SECOND	#	#	ENABLED
 events_test	two_event	ev_test@localhost	RECURRING	NULL	20	SECOND	#	#	ENABLED
 "This should show us only 2 events:";
-SHOW FULL EVENTS LIKE 't%event';
+SHOW EVENTS LIKE 't%event';
 Db	Name	Definer	Type	Execute at	Interval value	Interval field	Starts	Ends	Status
 events_test	three_event	ev_test@localhost	RECURRING	NULL	20	SECOND	#	#	ENABLED
 events_test	two_event	ev_test@localhost	RECURRING	NULL	20	SECOND	#	#	ENABLED
 "This should show us no events:";
-SHOW FULL EVENTS FROM test LIKE '%';
+SHOW EVENTS FROM test LIKE '%';
 Db	Name	Definer	Type	Execute at	Interval value	Interval field	Starts	Ends	Status
 DROP DATABASE events_test2;
 "should see 1 event:";
@@ -343,11 +343,8 @@ SHOW EVENTS;
 Db	Name	Definer	Type	Execute at	Interval value	Interval field	Starts	Ends	Status
 events_test	one_event	root@localhost	RECURRING	NULL	10	SECOND	#	#	ENABLED
 "we should see 4 events now:";
-SHOW FULL EVENTS;
+SHOW EVENTS;
 Db	Name	Definer	Type	Execute at	Interval value	Interval field	Starts	Ends	Status
-events_test	one_event	ev_test@localhost	RECURRING	NULL	20	SECOND	#	#	ENABLED
-events_test	three_event	ev_test@localhost	RECURRING	NULL	20	SECOND	#	#	ENABLED
-events_test	two_event	ev_test@localhost	RECURRING	NULL	20	SECOND	#	#	ENABLED
 events_test	one_event	root@localhost	RECURRING	NULL	10	SECOND	#	#	ENABLED
 SELECT EVENT_CATALOG, EVENT_SCHEMA, EVENT_NAME, DEFINER, EVENT_BODY, EVENT_TYPE, EXECUTE_AT, INTERVAL_VALUE, INTERVAL_FIELD, STATUS,ON_COMPLETION, EVENT_COMMENT from information_schema.events;
 EVENT_CATALOG	EVENT_SCHEMA	EVENT_NAME	DEFINER	EVENT_BODY	EVENT_TYPE	EXECUTE_AT	INTERVAL_VALUE	INTERVAL_FIELD	STATUS	ON_COMPLETION	EVENT_COMMENT
@@ -373,12 +370,12 @@ ERROR HY000: Incorrect AT value: 'definitely not a datetime'
 set names utf8;
 create event задачка on schedule every 123 minute starts now() ends now() + interval 1 month do select 1;
 drop event задачка;
-set event_scheduler=0;
+set event_scheduler=2;
 ERROR HY000: Variable 'event_scheduler' is a GLOBAL variable and should be set with SET GLOBAL
-set global event_scheduler=2;
-ERROR 42000: Variable 'event_scheduler' can't be set to the value of '2'
+set global event_scheduler=3;
+ERROR 42000: Variable 'event_scheduler' can't be set to the value of '3'
 "DISABLE the scheduler. Testing that it does not work when the variable is 0"
-set global event_scheduler=0;
+set global event_scheduler=2;
 select definer, name, db from mysql.event;
 definer	name	db
 select get_lock("test_lock1", 20);
@@ -389,9 +386,10 @@ create event закачка on schedule every 10 hour do select get_lock("test_l
 select definer, name, db from mysql.event;
 definer	name	db
 root@localhost	закачка	events_test
-"Should be 0 processes"
+"Should be only 1 process"
 select /*1*/ user, host, db, command, state, info from information_schema.processlist where info is null or info not like '%processlist%' order by info;
 user	host	db	command	state	info
+event_scheduler	localhost	NULL	Connect	Suspended	NULL
 select release_lock("test_lock1");
 release_lock("test_lock1")
 1
@@ -409,11 +407,12 @@ get_lock("test_lock2", 20)
 create event закачка on schedule every 10 hour do select get_lock("test_lock2", 20);
 "Let some time pass to the event starts"
 "Should have only 2 processes: the scheduler and the locked event"
-select /*1*/ user, host, db, command, state, info from information_schema.processlist where info is null or info not like '%processlist%' order by info;
+select /*2*/ user, host, db, command, state, info from information_schema.processlist where info is null or info not like '%processlist%' order by info;
 user	host	db	command	state	info
 event_scheduler	localhost	NULL	Connect	Sleeping	NULL
 root	localhost	events_test	Connect	User lock	select get_lock("test_lock2", 20)
 "Release the mutex, the event worker should finish."
+"Release the mutex, the event worker should finish."
 select release_lock("test_lock2");
 release_lock("test_lock2")
 1
@@ -423,21 +422,17 @@ select get_lock("test_lock2_1", 20);
 get_lock("test_lock2_1", 20)
 1
 create event закачка21 on schedule every 10 hour do select get_lock("test_lock2_1", 20);
-"Should see 1 process, locked on get_lock("
-"Shutting down the scheduler, it should wait for the running event"
-set global event_scheduler=0;
-"Should have only 2 processes: the scheduler and the locked event"
-select /*4*/ user, host, db, command, state, info from information_schema.processlist where info is null or info not like '%processlist%' order by info;
+"Should have only 3 processes: the scheduler, our conn and the locked event"
+select /*3*/ user, host, db, command, state, info from information_schema.processlist where info is null or info not like '%processlist%' order by info;
 user	host	db	command	state	info
 event_scheduler	localhost	NULL	Connect	Sleeping	NULL
 root	localhost	events_test	Connect	User lock	select get_lock("test_lock2_1", 20)
-"Release the lock so the child process should finish. Hence the scheduler also"
-select release_lock("test_lock2_1");
-release_lock("test_lock2_1")
-1
-"Should see 0 processes now:"
-select /*5*/ user, host, db, command, state, info from information_schema.processlist where info is null or info not like '%processlist%' order by info;
+set global event_scheduler=2;
+"Should have only our process now:"
+select /*4*/ user, host, db, command, state, info from information_schema.processlist where info is null or info not like '%processlist%' order by info;
 user	host	db	command	state	info
+event_scheduler	localhost	NULL	Connect	Suspended	NULL
+root	localhost	events_test	Connect	User lock	select get_lock("test_lock2_1", 20)
 drop event закачка21;
 create table t_16 (s1 int);
 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;
@@ -457,6 +452,9 @@ select 2;
 select event_schema, event_name, definer, event_body from information_schema.events where event_name='white_space';
 event_schema	event_name	definer	event_body
 events_test	white_space	root@localhost	select 2
+select event_schema, event_name, definer, event_body from information_schema.events where event_name='white_space';
+event_schema	event_name	definer	event_body
+events_test	white_space	root@localhost	select 2
 drop event white_space;
 create event white_space on schedule every 10 hour disable do	select 3;
 select event_schema, event_name, definer, event_body from information_schema.events where event_name='white_space';
diff --git a/mysql-test/r/events_bugs.result b/mysql-test/r/events_bugs.result
index ef1ccfadecb..bc89c692f9a 100644
--- a/mysql-test/r/events_bugs.result
+++ b/mysql-test/r/events_bugs.result
@@ -35,7 +35,7 @@ create event e_55 on schedule every 10 hour starts 99990101000000 do drop table
 ERROR HY000: Incorrect STARTS value: '99990101000000'
 create event e_55 on schedule every 10 minute ends 99990101000000 do drop table t;
 ERROR HY000: ENDS is either invalid or before STARTS
-set global event_scheduler=0;
+set global event_scheduler=2;
 "Wait a bit to settle down"
 delete from mysql.event;
 set global event_scheduler= 1;
@@ -57,7 +57,7 @@ root	localhost	events_test	Connect	User lock	select get_lock('test_bug16407', 60
 select release_lock('test_bug16407');
 release_lock('test_bug16407')
 1
-set global event_scheduler= 0;
+set global event_scheduler= 2;
 select event_schema, event_name, sql_mode from information_schema.events order by event_schema, event_name;
 event_schema	event_name	sql_mode
 events_test	e_16407	REAL_AS_FLOAT,PIPES_AS_CONCAT,ANSI_QUOTES,IGNORE_SPACE,ANSI
@@ -115,7 +115,7 @@ release_lock('ee_16407_2')
 select /*3*/ user, host, db, command, state, info from information_schema.processlist where info is null or info not like '%processlist%' order by info;
 user	host	db	command	state	info
 event_scheduler	localhost	NULL	Connect	Sleeping	NULL
-set global event_scheduler= 0;
+set global event_scheduler= 2;
 select * from events_smode_test order by ev_name, a;
 ev_name	a
 ee_16407_3	1980-02-19
@@ -175,7 +175,7 @@ drop event ee_16407_5;
 drop event ee_16407_6;
 drop procedure ee_16407_5_pendant;
 drop procedure ee_16407_6_pendant;
-set global event_scheduler= 0;
+set global event_scheduler= 2;
 drop table events_smode_test;
 set sql_mode=@old_sql_mode;
 drop database events_test;
diff --git a/mysql-test/r/events_logs_tests.result b/mysql-test/r/events_logs_tests.result
index ab1666fefb9..911bc8b2d60 100644
--- a/mysql-test/r/events_logs_tests.result
+++ b/mysql-test/r/events_logs_tests.result
@@ -8,7 +8,7 @@ BEGIN
 SELECT user_host, argument FROM mysql.general_log WHERE argument LIKE '%alabala%';
 END|
 "Check General Query Log"
-SET GLOBAL event_scheduler=0;
+SET GLOBAL event_scheduler=2;
 create event log_general on schedule every 1 minute do SELect 'alabala', sleep(3) from dual;
 TRUNCATE mysql.general_log;
 "1 row, the current statement!"
@@ -22,7 +22,7 @@ user_host	argument
 root[root] @ localhost [localhost]	SELect 'alabala', sleep(3) from dual
 DROP PROCEDURE select_general_log;
 DROP EVENT log_general;
-SET GLOBAL event_scheduler=0;
+SET GLOBAL event_scheduler=2;
 "Check slow query log"
 "Save the values"
 SET @old_global_long_query_time:=(select get_value());
@@ -36,14 +36,14 @@ SELECT user_host, query_time, db, sql_text FROM mysql.slow_log;
 user_host	query_time	db	sql_text
 "Set new values"
 SET GLOBAL long_query_time=4;
-SET SESSION long_query_time=2;
+SET SESSION long_query_time=1;
 "Check that logging is working"
-SELECT SLEEP(3);
-SLEEP(3)
+SELECT SLEEP(2);
+SLEEP(2)
 0
 SELECT user_host, query_time, db, sql_text FROM mysql.slow_log;
 user_host	query_time	db	sql_text
-root[root] @ localhost []	SLEEPVAL	events_test	SELECT SLEEP(3)
+root[root] @ localhost []	SLEEPVAL	events_test	SELECT SLEEP(2)
 TRUNCATE mysql.slow_log;
 CREATE TABLE slow_event_test (slo_val tinyint, val tinyint);
 "This won't go to the slow log"
@@ -54,7 +54,7 @@ SET GLOBAL event_scheduler=1;
 "Sleep some more time than the actual event run will take"
 SHOW VARIABLES LIKE 'event_scheduler';
 Variable_name	Value
-event_scheduler	ON
+event_scheduler	1
 "Check our table. Should see 1 row"
 SELECT * FROM slow_event_test;
 slo_val	val
@@ -64,18 +64,19 @@ SELECT user_host, query_time, db, sql_text FROM mysql.slow_log;
 user_host	query_time	db	sql_text
 "This should go to the slow log"
 SET SESSION long_query_time=10;
+SET GLOBAL long_query_time=1;
 DROP EVENT long_event;
-CREATE EVENT long_event2 ON SCHEDULE EVERY 1 MINUTE DO INSERT INTO slow_event_test SELECT @@long_query_time, SLEEP(5);
+CREATE EVENT long_event2 ON SCHEDULE EVERY 1 MINUTE DO INSERT INTO slow_event_test SELECT @@long_query_time, SLEEP(2);
 "Sleep some more time than the actual event run will take"
 "Check our table. Should see 2 rows"
 SELECT * FROM slow_event_test;
 slo_val	val
 4	0
-4	0
-"Check slow log. Should see 1 row because 5 is over the threshold of 4 for GLOBAL, though under SESSION which is 10"
+1	0
+"Check slow log. Should see 1 row because 4 is over the threshold of 3 for GLOBAL, though under SESSION which is 10"
 SELECT user_host, query_time, db, sql_text FROM mysql.slow_log;
 user_host	query_time	db	sql_text
-root[root] @ localhost [localhost]	SLEEPVAL	events_test	INSERT INTO slow_event_test SELECT @@long_query_time, SLEEP(5)
+root[root] @ localhost [localhost]	SLEEPVAL	events_test	INSERT INTO slow_event_test SELECT @@long_query_time, SLEEP(2)
 DROP EVENT long_event2;
 SET GLOBAL  long_query_time =@old_global_long_query_time;
 SET SESSION long_query_time =@old_session_long_query_time;
diff --git a/mysql-test/r/events_microsec.result b/mysql-test/r/events_microsec.result
index ed15b066b93..b96bd551511 100644
--- a/mysql-test/r/events_microsec.result
+++ b/mysql-test/r/events_microsec.result
@@ -10,50 +10,4 @@ CREATE EVENT micro_test ON SCHEDULE EVERY 100 MINUTE_MICROSECOND DO SELECT 1;
 ERROR 42000: This version of MySQL doesn't yet support 'MICROSECOND'
 CREATE EVENT micro_test ON SCHEDULE EVERY 100 SECOND_MICROSECOND DO SELECT 1;
 ERROR 42000: This version of MySQL doesn't yet support 'MICROSECOND'
-"Now create normal event and change it on SQL level"
-CREATE EVENT micro_test2 ON SCHEDULE EVERY 1 MONTH DO SELECT 1;
-UPDATE mysql.event SET interval_field='MICROSECOND' WHERE db=database() AND definer=user() AND name='micro_test2';
-SHOW CREATE EVENT micro_test2;
-ERROR 42000: This version of MySQL doesn't yet support 'MICROSECOND'
-SET GLOBAL event_scheduler=0;
-"Should not be running:"
-SHOW VARIABLES like 'event_scheduler';
-Variable_name	Value
-event_scheduler	OFF
-UPDATE mysql.event SET interval_field='DAY_MICROSECOND' WHERE db=database() AND definer=user() AND name='micro_test2';
-SHOW CREATE EVENT micro_test2;
-ERROR 42000: This version of MySQL doesn't yet support 'MICROSECOND'
-SET GLOBAL event_scheduler=0;
-"Should not be running:"
-SHOW VARIABLES like 'event_scheduler';
-Variable_name	Value
-event_scheduler	OFF
-UPDATE mysql.event SET interval_field='SECOND_MICROSECOND' WHERE db=database() AND definer=user() AND name='micro_test2';
-SHOW CREATE EVENT micro_test2;
-ERROR 42000: This version of MySQL doesn't yet support 'MICROSECOND'
-SET GLOBAL event_scheduler=0;
-"Should not be running:"
-SHOW VARIABLES like 'event_scheduler';
-Variable_name	Value
-event_scheduler	OFF
-UPDATE mysql.event SET interval_field='HOUR_MICROSECOND' WHERE db=database() AND definer=user() AND name='micro_test2';
-SHOW CREATE EVENT micro_test2;
-ERROR 42000: This version of MySQL doesn't yet support 'MICROSECOND'
-SET GLOBAL event_scheduler=0;
-"Should not be running:"
-SHOW VARIABLES like 'event_scheduler';
-Variable_name	Value
-event_scheduler	OFF
-UPDATE mysql.event SET interval_field='MINUTE_MICROSECOND' WHERE db=database() AND definer=user() AND name='micro_test2';
-SHOW CREATE EVENT micro_test2;
-ERROR 42000: This version of MySQL doesn't yet support 'MICROSECOND'
-SET GLOBAL event_scheduler=0;
-"Should not be running:"
-SHOW VARIABLES like 'event_scheduler';
-Variable_name	Value
-event_scheduler	OFF
-SELECT COUNT(*) FROM INFORMATION_SCHEMA.PROCESSLIST WHERE USER='event_scheduler';
-COUNT(*)
-0
-DROP EVENT micro_test2;
 drop database events_test;
diff --git a/mysql-test/r/events_scheduling.result b/mysql-test/r/events_scheduling.result
index 8b1f29d320f..aec2053f0e7 100644
--- a/mysql-test/r/events_scheduling.result
+++ b/mysql-test/r/events_scheduling.result
@@ -14,7 +14,7 @@ ENDS NOW() + INTERVAL 6 SECOND
 ON COMPLETION PRESERVE
 DO INSERT INTO table_2 VALUES(1);
 CREATE EVENT only_one_time ON SCHEDULE EVERY 2 SECOND ENDS NOW() + INTERVAL 1 SECOND DO INSERT INTO table_3 VALUES(1);
-CREATE EVENT two_time ON SCHEDULE EVERY 1 SECOND ENDS NOW() + INTERVAL 1 SECOND DO INSERT INTO table_4 VALUES(1);
+CREATE EVENT two_time ON SCHEDULE EVERY 1 SECOND ENDS NOW() + INTERVAL 1 SECOND ON COMPLETION PRESERVE DO INSERT INTO table_4 VALUES(1);
 SELECT IF(SUM(a) >= 4, 'OK', 'ERROR') FROM table_1;
 IF(SUM(a) >= 4, 'OK', 'ERROR')
 OK
@@ -38,9 +38,12 @@ DROP EVENT start_n_end;
 "Already dropped because ended. Therefore an error."
 DROP EVENT only_one_time;
 ERROR HY000: Unknown event 'only_one_time'
-"Already dropped because ended. Therefore an error."
+"Should be preserved"
+SELECT EVENT_NAME, STATUS FROM INFORMATION_SCHEMA.EVENTS;
+EVENT_NAME	STATUS
+E19170	ENABLED
+two_time	DISABLED
 DROP EVENT two_time;
-ERROR HY000: Unknown event 'two_time'
 DROP TABLE table_1;
 DROP TABLE table_2;
 DROP TABLE table_3;
diff --git a/mysql-test/r/events_stress.result b/mysql-test/r/events_stress.result
index 9f95cfad75d..a903a4502bf 100644
--- a/mysql-test/r/events_stress.result
+++ b/mysql-test/r/events_stress.result
@@ -1,46 +1,61 @@
 CREATE DATABASE IF NOT EXISTS events_test;
-CREATE DATABASE events_test2;
-USE events_test2;
+CREATE DATABASE events_conn1_test2;
+CREATE TABLE events_test.fill_it(test_name varchar(20), occur datetime);
+CREATE USER event_user2@localhost;
+CREATE DATABASE events_conn2_db;
+GRANT ALL ON *.* TO event_user2@localhost;
+CREATE USER event_user3@localhost;
+CREATE DATABASE events_conn3_db;
+GRANT ALL ON *.* TO event_user3@localhost;
+"In the second connection we create some events which won't be dropped till the end"
+"In the second connection we create some events which won't be dropped till the end"
+USE events_conn1_test2;
 CREATE EVENT ev_drop1 ON SCHEDULE EVERY 10 MINUTE DISABLE DO SELECT 1;
 CREATE EVENT ev_drop2 ON SCHEDULE EVERY 10 MINUTE DISABLE DO SELECT 1;
 CREATE EVENT ev_drop3 ON SCHEDULE EVERY 10 MINUTE DISABLE DO SELECT 1;
 USE events_test;
-SELECT COUNT(*) FROM INFORMATION_SCHEMA.EVENTS WHERE EVENT_SCHEMA='events_test2';
+SELECT COUNT(*) FROM INFORMATION_SCHEMA.EVENTS;
+COUNT(*)
+203
+SELECT COUNT(*) FROM INFORMATION_SCHEMA.EVENTS WHERE EVENT_SCHEMA='events_conn1_test2';
 COUNT(*)
 3
-DROP DATABASE events_test2;
-SELECT COUNT(*) FROM INFORMATION_SCHEMA.EVENTS WHERE EVENT_SCHEMA='events_test2';
+DROP DATABASE events_conn1_test2;
+SELECT COUNT(*) FROM INFORMATION_SCHEMA.EVENTS WHERE EVENT_SCHEMA='events_conn1_test2';
 COUNT(*)
 0
 "Now testing stability - dropping db -> events while they are running"
-CREATE DATABASE events_test2;
-USE events_test2;
-SELECT COUNT(*) FROM INFORMATION_SCHEMA.EVENTS WHERE EVENT_SCHEMA='events_test2';
+CREATE DATABASE events_conn1_test2;
+USE events_conn1_test2;
+SELECT COUNT(*) FROM INFORMATION_SCHEMA.EVENTS WHERE EVENT_SCHEMA='events_conn1_test2';
 COUNT(*)
-1000
+100
 SET GLOBAL event_scheduler=1;
-DROP DATABASE events_test2;
-SET GLOBAL event_scheduler=0;
-SELECT COUNT(*) FROM INFORMATION_SCHEMA.EVENTS WHERE EVENT_SCHEMA='events_test2';
+DROP DATABASE events_conn1_test2;
+SET GLOBAL event_scheduler=2;
+SELECT COUNT(*) FROM INFORMATION_SCHEMA.EVENTS WHERE EVENT_SCHEMA='events_conn1_test2';
 COUNT(*)
 0
-CREATE DATABASE events_test3;
-USE events_test3;
-SELECT COUNT(*) FROM INFORMATION_SCHEMA.EVENTS WHERE EVENT_SCHEMA='events_test3';
+CREATE DATABASE events_conn1_test3;
+USE events_conn1_test3;
+SET GLOBAL event_scheduler=1;
+SELECT COUNT(*) FROM INFORMATION_SCHEMA.EVENTS WHERE EVENT_SCHEMA='events_conn1_test3';
 COUNT(*)
-950
-CREATE DATABASE events_test4;
-USE events_test4;
-CREATE DATABASE events_test2;
-USE events_test2;
-SELECT COUNT(*) FROM INFORMATION_SCHEMA.EVENTS WHERE EVENT_SCHEMA='events_test2';
+100
+CREATE DATABASE events_conn1_test4;
+USE events_conn1_test4;
+CREATE DATABASE events_conn1_test2;
+USE events_conn1_test2;
+SELECT COUNT(*) FROM INFORMATION_SCHEMA.EVENTS WHERE EVENT_SCHEMA='events_conn1_test2';
 COUNT(*)
-1050
-DROP DATABASE events_test2;
-SET GLOBAL event_scheduler=0;
-DROP DATABASE events_test3;
-SET GLOBAL event_scheduler=1;
-DROP DATABASE events_test4;
+100
+DROP DATABASE events_conn2_db;
+DROP DATABASE events_conn3_db;
+DROP DATABASE events_conn1_test2;
+DROP DATABASE events_conn1_test3;
+SET GLOBAL event_scheduler=2;
+DROP DATABASE events_conn1_test4;
 SET GLOBAL event_scheduler=1;
 USE events_test;
+DROP TABLE fill_it;
 DROP DATABASE events_test;