mariadb/mysql-test/r/debug_sync.result
Sergey Vojtovich 8774a02364 MDEV-11227 - mysqlimport -l doesn't issue UNLOCK TABLES
Implementation of MDEV-7660 introduced unwanted incompatible change:
modifications under LOCK TABLES with autocommit enabled are rolled back on
disconnect. Previously everything was committed, because LOCK TABLES didn't
adjust autocommit setting.

This patch restores original behavior by reverting some changes done in
MDEV-7660:
- sql/sql_parse.cc: do not reset autocommit on LOCK TABLES
- sql/sql_base.cc: do not set autocommit on UNLOCK TABLES
- test cases: main.lock_tables_lost_commit, main.partition_explicit_prune,
  rpl.rpl_switch_stm_row_mixed, tokudb.nested_txn_implicit_commit,
  tokudb_bugs.db806

But it makes InnoDB tables under LOCK TABLES ... READ [LOCAL] not protected
against DML. To restore protection some changes from WL#6671 were merged,
specifically MDL_SHARED_READ_ONLY and test cases.

WL#6671 merge highlights:
- Not all tests merged.
- In MySQL LOCK TABLES ... READ acquires MDL_SHARED_READ_ONLY for all engines,
  in MariaDB MDL_SHARED_READ is always acquired first and then upgraded to
  MDL_SHARED_READ_ONLY for InnoDB only.
- The above allows us to omit MDL_SHARED_WRITE_LOW_PRIO implementation in
  MariaDB, which is rather useless with InnoDB. In MySQL it is needed to
  preserve locking behavior between low priority writes and LOCK TABLES ... READ
  for non-InnoDB engines (covered by sys_vars.sql_low_priority_updates_func).
- Omitted HA_NO_READ_LOCAL_LOCK, we rely on lock_count() instead.
- Omitted "piglets": in MariaDB stream of DML against InnoDB table may lead to
  concurrent LOCK TABLES ... READ starvation.
- HANDLER ... OPEN acquires MDL_SHARED_READ instead of MDL_SHARED in MariaDB.
- Omitted SNRW->X MDL lock upgrade for IMPORT/DISCARD TABLESPAECE under LOCK
  TABLES.
- Omitted strong locks for views, triggers and SP under LOCK TABLES.
- Omitted IX schema lock for LOCK TABLES READ.
- Omitted deadlock weight juggling for LOCK TABLES.

Full WL#6671 merge status:
- innodb.innodb-lock: fully merged
- main.alter_table: not merged due to different HANDLER solution
- main.debug_sync: fully merged
- main.handler_innodb: not merged due to different HANDLER solution
- main.handler_myisam: not merged due to different HANDLER solution
- main.innodb_mysql_lock: fully merged
- main.insert_notembedded: fully merged
- main.lock: not merged (due to no strong locks for views)
- main.lock_multi: not merged
- main.lock_sync: fully merged (partially in MDEV-7660)
- main.mdl_sync: not merged
- main.partition_debug_sync: not merged due to different HANDLER solution
- main.status: fully merged
- main.view: fully merged
- perfschema.mdl_func: not merged (no such test in MariaDB)
- perfschema.table_aggregate_global_2u_2t: not merged (didn't fail in MariaDB)
- perfschema.table_aggregate_global_2u_3t: not merged (didn't fail in MariaDB)
- perfschema.table_aggregate_global_4u_2t: not merged (didn't fail in MariaDB)
- perfschema.table_aggregate_global_4u_3t: not merged (didn't fail in MariaDB)
- perfschema.table_aggregate_hist_2u_2t: not merged (didn't fail in MariaDB)
- perfschema.table_aggregate_hist_2u_3t: not merged (didn't fail in MariaDB)
- perfschema.table_aggregate_hist_4u_2t: not merged (didn't fail in MariaDB)
- perfschema.table_aggregate_hist_4u_3t: not merged (didn't fail in MariaDB)
- perfschema.table_aggregate_thread_2u_2t: not merged (didn't fail in MariaDB)
- perfschema.table_aggregate_thread_2u_3t: not merged (didn't fail in MariaDB)
- perfschema.table_aggregate_thread_4u_2t: not merged (didn't fail in MariaDB)
- perfschema.table_aggregate_thread_4u_3t: not merged (didn't fail in MariaDB)
- perfschema.table_lock_aggregate_global_2u_2t: not merged (didn't fail in MariaDB)
- perfschema.table_lock_aggregate_global_2u_3t: not merged (didn't fail in MariaDB)
- perfschema.table_lock_aggregate_global_4u_2t: not merged (didn't fail in MariaDB)
- perfschema.table_lock_aggregate_global_4u_3t: not merged (didn't fail in MariaDB)
- perfschema.table_lock_aggregate_hist_2u_2t: not merged (didn't fail in MariaDB)
- perfschema.table_lock_aggregate_hist_2u_3t: not merged (didn't fail in MariaDB)
- perfschema.table_lock_aggregate_hist_4u_2t: not merged (didn't fail in MariaDB)
- perfschema.table_lock_aggregate_hist_4u_3t: not merged (didn't fail in MariaDB)
- perfschema.table_lock_aggregate_thread_2u_2t: not merged (didn't fail in MariaDB)
- perfschema.table_lock_aggregate_thread_2u_3t: not merged (didn't fail in MariaDB)
- perfschema.table_lock_aggregate_thread_4u_2t: not merged (didn't fail in MariaDB)
- perfschema.table_lock_aggregate_thread_4u_3t: not merged (didn't fail in MariaDB)
- sys_vars.sql_low_priority_updates_func: not merged
- include/thr_rwlock.h: not merged, rw_pr_lock_assert_write_owner and
  rw_pr_lock_assert_not_write_owner are macros in MariaDB
- sql/handler.h: not merged (HA_NO_READ_LOCAL_LOCK)
- sql/mdl.cc: partially merged (MDL_SHARED_READ_ONLY only)
- sql/mdl.h: partially merged (MDL_SHARED_READ_ONLY only)
- sql/lock.cc: fully merged
- sql/sp_head.cc: not merged
- sql/sp_head.h: not merged
- sql/sql_base.cc: partially merged (MDL_SHARED_READ_ONLY only)
- sql/sql_base.h: not merged
- sql/sql_class.cc: fully merged
- sql/sql_class.h: fully merged
- sql/sql_handler.cc: merged partially (different solution in MariaDB)
- sql/sql_parse.cc: partially merged, mostly omitted low priority write part
- sql/sql_reload.cc: not merged comment change
- sql/sql_table.cc: not merged SNRW->X upgrade for IMPORT/DISCARD TABLESPACE
- sql/sql_view.cc: not merged
- sql/sql_yacc.yy: not merged (MDL_SHARED_WRITE_LOW_PRIO, MDL_SHARED_READ_ONLY)
- sql/table.cc: not merged (MDL_SHARED_WRITE_LOW_PRIO)
- sql/table.h: not merged (MDL_SHARED_WRITE_LOW_PRIO)
- sql/trigger.cc: not merged
- storage/innobase/handler/ha_innodb.cc: merged store_lock()/lock_count()
  changes (in MDEV-7660), didn't merge HA_NO_READ_LOCAL_LOCK
- storage/innobase/handler/ha_innodb.h: fully merged in MDEV-7660
- storage/myisammrg/ha_myisammrg.cc: not merged comment change
- storage/perfschema/table_helper.cc: not merged (no MDL support in MariaDB PFS)
- unittest/gunit/mdl-t.cc: not merged
- unittest/gunit/mdl_sync-t.cc: not merged

MariaDB specific changes:
- handler.heap: different HANDLER solution, MDEV-7660
- handler.innodb: different HANDLER solution, MDEV-7660
- handler.interface: different HANDLER solution, MDEV-7660
- handler.myisam: different HANDLER solution, MDEV-7660
- main.mdl_sync: MDEV-7660 specific changes
- main.partition_debug_sync: removed test due to different HANDLER solution,
  MDEV-7660
- main.truncate_coverage: removed test due to different HANDLER solution,
  MDEV-7660
- mysql-test/include/mtr_warnings.sql: additional cleanup, MDEV-7660
- mysql-test/lib/v1/mtr_report.pl: additional cleanup, MDEV-7660
- plugin/metadata_lock_info/metadata_lock_info.cc: not in MySQL
- sql/sql_handler.cc: MariaDB specific fix for mysql_ha_read(), MDEV-7660
2016-12-21 13:18:45 +04:00

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Text

SET DEBUG_SYNC= 'RESET';
DROP TABLE IF EXISTS t1;
SHOW VARIABLES LIKE 'DEBUG_SYNC';
Variable_name Value
debug_sync ON - current signal: ''
SET DEBUG_SYNC='p0 SIGNAL s1 WAIT_FOR s2 TIMEOUT 6 EXECUTE 2 HIT_LIMIT 3';
SET DEBUG_SYNC='p0 SIGNAL s1 WAIT_FOR s2 TIMEOUT 6 EXECUTE 2';
SET DEBUG_SYNC='p0 SIGNAL s1 WAIT_FOR s2 TIMEOUT 6 HIT_LIMIT 3';
SET DEBUG_SYNC='p0 SIGNAL s1 WAIT_FOR s2 TIMEOUT 6';
SET DEBUG_SYNC='p0 SIGNAL s1 WAIT_FOR s2 EXECUTE 2 HIT_LIMIT 3';
SET DEBUG_SYNC='p0 SIGNAL s1 WAIT_FOR s2 EXECUTE 2';
SET DEBUG_SYNC='p0 SIGNAL s1 WAIT_FOR s2 HIT_LIMIT 3';
SET DEBUG_SYNC='p0 SIGNAL s1 WAIT_FOR s2';
SET DEBUG_SYNC='p0 SIGNAL s1 EXECUTE 2 HIT_LIMIT 3';
SET DEBUG_SYNC='p0 SIGNAL s1 EXECUTE 2';
SET DEBUG_SYNC='p0 SIGNAL s1 HIT_LIMIT 3';
SET DEBUG_SYNC='p0 SIGNAL s1';
SET DEBUG_SYNC='p0 WAIT_FOR s2 TIMEOUT 6 EXECUTE 2 HIT_LIMIT 3';
SET DEBUG_SYNC='p0 WAIT_FOR s2 TIMEOUT 6 EXECUTE 2';
SET DEBUG_SYNC='p0 WAIT_FOR s2 TIMEOUT 6 HIT_LIMIT 3';
SET DEBUG_SYNC='p0 WAIT_FOR s2 TIMEOUT 6';
SET DEBUG_SYNC='p0 WAIT_FOR s2 EXECUTE 2 HIT_LIMIT 3';
SET DEBUG_SYNC='p0 WAIT_FOR s2 EXECUTE 2';
SET DEBUG_SYNC='p0 WAIT_FOR s2 HIT_LIMIT 3';
SET DEBUG_SYNC='p0 WAIT_FOR s2';
SET DEBUG_SYNC='p0 HIT_LIMIT 3';
SET DEBUG_SYNC='p0 CLEAR';
SET DEBUG_SYNC='p0 TEST';
SET DEBUG_SYNC='RESET';
set debug_sync='p0 signal s1 wait_for s2 timeout 6 execute 2 hit_limit 3';
set debug_sync='p0 signal s1 wait_for s2 timeout 6 execute 2';
set debug_sync='p0 signal s1 wait_for s2 timeout 6 hit_limit 3';
set debug_sync='p0 signal s1 wait_for s2 timeout 6';
set debug_sync='p0 signal s1 wait_for s2 execute 2 hit_limit 3';
set debug_sync='p0 signal s1 wait_for s2 execute 2';
set debug_sync='p0 signal s1 wait_for s2 hit_limit 3';
set debug_sync='p0 signal s1 wait_for s2';
set debug_sync='p0 signal s1 execute 2 hit_limit 3';
set debug_sync='p0 signal s1 execute 2';
set debug_sync='p0 signal s1 hit_limit 3';
set debug_sync='p0 signal s1';
set debug_sync='p0 wait_for s2 timeout 6 execute 2 hit_limit 3';
set debug_sync='p0 wait_for s2 timeout 6 execute 2';
set debug_sync='p0 wait_for s2 timeout 6 hit_limit 3';
set debug_sync='p0 wait_for s2 timeout 6';
set debug_sync='p0 wait_for s2 execute 2 hit_limit 3';
set debug_sync='p0 wait_for s2 execute 2';
set debug_sync='p0 wait_for s2 hit_limit 3';
set debug_sync='p0 wait_for s2';
set debug_sync='p0 hit_limit 3';
set debug_sync='p0 clear';
set debug_sync='p0 test';
set debug_sync='reset';
SET DEBUG_SYNC='p0 SIGNAL s1 WAIT_FOR s2 TIMEOUT 6
EXECUTE 2 HIT_LIMIT 3';
SET DEBUG_SYNC=' p0 SIGNAL s1 WAIT_FOR s2';
SET DEBUG_SYNC='p0 SIGNAL s1 WAIT_FOR s2';
SET DEBUG_SYNC='p0 SIGNAL s1 WAIT_FOR s2 ';
SET DEBUG_SYNC=' p0 SIGNAL s1 WAIT_FOR s2 ';
SET DEBUG_SYNC=' p0 SIGNAL s1 WAIT_FOR s2 ';
SET DEBUG_SYNC='';
ERROR 42000: Missing synchronization point name
SET DEBUG_SYNC=' ';
ERROR 42000: Missing synchronization point name
SET DEBUG_SYNC='p0';
ERROR 42000: Missing action after synchronization point name 'p0'
SET DEBUG_SYNC='p0 EXECUTE 2';
ERROR 42000: Missing action before EXECUTE
SET DEBUG_SYNC='p0 TIMEOUT 6 EXECUTE 2';
ERROR 42000: Illegal or out of order stuff: 'TIMEOUT'
SET DEBUG_SYNC='p0 TIMEOUT 6';
ERROR 42000: Illegal or out of order stuff: 'TIMEOUT'
SET DEBUG_SYNC='p0 WAIT_FOR s2 SIGNAL s1';
ERROR 42000: Illegal or out of order stuff: 'SIGNAL'
SET DEBUG_SYNC='p0 WAIT_FOR s2 SIGNAL s1 EXECUTE 2';
ERROR 42000: Illegal or out of order stuff: 'SIGNAL'
SET DEBUG_SYNC='p0 WAIT_FOR s2 SIGNAL s1 TIMEOUT 6 EXECUTE 2';
ERROR 42000: Illegal or out of order stuff: 'SIGNAL'
SET DEBUG_SYNC='p0 WAIT_FOR s2 SIGNAL s1 TIMEOUT 6';
ERROR 42000: Illegal or out of order stuff: 'SIGNAL'
SET DEBUG_SYNC='p0 WAIT_FOR s2 TIMEOUT 6 SIGNAL s1 EXECUTE 2';
ERROR 42000: Illegal or out of order stuff: 'SIGNAL'
SET DEBUG_SYNC='p0 WAIT_FOR s2 TIMEOUT 6 SIGNAL s1';
ERROR 42000: Illegal or out of order stuff: 'SIGNAL'
SET DEBUG_SYNC='p0 TIMEOUT 6 WAIT_FOR s2 EXECUTE 2';
ERROR 42000: Illegal or out of order stuff: 'TIMEOUT'
SET DEBUG_SYNC='p0 TIMEOUT 6 WAIT_FOR s2';
ERROR 42000: Illegal or out of order stuff: 'TIMEOUT'
SET DEBUG_SYNC='p0 SIGNAL s1 TIMEOUT 6 EXECUTE 2';
ERROR 42000: Illegal or out of order stuff: 'TIMEOUT'
SET DEBUG_SYNC='p0 SIGNAL s1 TIMEOUT 6';
ERROR 42000: Illegal or out of order stuff: 'TIMEOUT'
SET DEBUG_SYNC='p0 EXECUTE 2 SIGNAL s1 TIMEOUT 6';
ERROR 42000: Missing action before EXECUTE
SET DEBUG_SYNC='p0 TIMEOUT 6 SIGNAL s1';
ERROR 42000: Illegal or out of order stuff: 'TIMEOUT'
SET DEBUG_SYNC='p0 EXECUTE 2 TIMEOUT 6 SIGNAL s1';
ERROR 42000: Missing action before EXECUTE
SET DEBUG_SYNC='p0 CLEAR HIT_LIMIT 3';
ERROR 42000: Nothing must follow action CLEAR
SET DEBUG_SYNC='CLEAR';
ERROR 42000: Missing action after synchronization point name 'CLEAR'
SET DEBUG_SYNC='p0 CLEAR p0';
ERROR 42000: Nothing must follow action CLEAR
SET DEBUG_SYNC='TEST';
ERROR 42000: Missing action after synchronization point name 'TEST'
SET DEBUG_SYNC='p0 TEST p0';
ERROR 42000: Nothing must follow action TEST
SET DEBUG_SYNC='p0 RESET';
ERROR 42000: Illegal or out of order stuff: 'RESET'
SET DEBUG_SYNC='RESET p0';
ERROR 42000: Illegal or out of order stuff: 'p0'
SET DEBUG_SYNC='p0 RESET p0';
ERROR 42000: Illegal or out of order stuff: 'RESET'
SET DEBUG_SYNC='p0 SIGNAL ';
ERROR 42000: Missing signal name after action SIGNAL
SET DEBUG_SYNC='p0 WAIT_FOR ';
ERROR 42000: Missing signal name after action WAIT_FOR
SET DEBUG_SYNC='p0 SIGNAL s1 EXECUTE ';
ERROR 42000: Missing valid number after EXECUTE
SET DEBUG_SYNCx='p0 SIGNAL s1 WAIT_FOR s2 TIMEOUT 6 EXECUTE 2 HIT_LIMIT 3';
ERROR HY000: Unknown system variable 'DEBUG_SYNCx'
SET DEBUG_SYNC='p0 SIGNAx s1 WAIT_FOR s2 TIMEOUT 6 EXECUTE 2 HIT_LIMIT 3';
ERROR 42000: Illegal or out of order stuff: 'SIGNAx'
SET DEBUG_SYNC='p0 SIGNAL s1 WAIT_FOx s2 TIMEOUT 6 EXECUTE 2 HIT_LIMIT 3';
ERROR 42000: Illegal or out of order stuff: 'WAIT_FOx'
SET DEBUG_SYNC='p0 SIGNAL s1 WAIT_FOR s2 TIMEOUx 0 EXECUTE 2 HIT_LIMIT 3';
ERROR 42000: Illegal or out of order stuff: 'TIMEOUx'
SET DEBUG_SYNC='p0 SIGNAL s1 WAIT_FOR s2 TIMEOUT 6 EXECUTx 2 HIT_LIMIT 3';
ERROR 42000: Illegal or out of order stuff: 'EXECUTx'
SET DEBUG_SYNC='p0 SIGNAL s1 WAIT_FOR s2 TIMEOUT 6 EXECUTE 2 HIT_LIMIx 3';
ERROR 42000: Illegal or out of order stuff: 'HIT_LIMIx'
SET DEBUG_SYNC='p0 CLEARx';
ERROR 42000: Illegal or out of order stuff: 'CLEARx'
SET DEBUG_SYNC='p0 TESTx';
ERROR 42000: Illegal or out of order stuff: 'TESTx'
SET DEBUG_SYNC='RESETx';
ERROR 42000: Missing action after synchronization point name 'RESETx'
SET DEBUG_SYNC='p0 WAIT_FOR s2 TIMEOUT 0x6 EXECUTE 2 HIT_LIMIT 3';
ERROR 42000: Missing valid number after TIMEOUT
SET DEBUG_SYNC='p0 WAIT_FOR s2 TIMEOUT 6 EXECUTE 0x2 HIT_LIMIT 3';
ERROR 42000: Missing valid number after EXECUTE
SET DEBUG_SYNC='p0 WAIT_FOR s2 TIMEOUT 7 EXECUTE 2 HIT_LIMIT 0x3';
ERROR 42000: Missing valid number after HIT_LIMIT
SET DEBUG_SYNC= 7;
ERROR 42000: Incorrect argument type to variable 'debug_sync'
SET GLOBAL DEBUG_SYNC= 'p0 CLEAR';
ERROR HY000: Variable 'debug_sync' is a SESSION variable and can't be used with SET GLOBAL
SET @myvar= 'now SIGNAL from_myvar';
SET DEBUG_SYNC= @myvar;
SHOW VARIABLES LIKE 'DEBUG_SYNC';
Variable_name Value
debug_sync ON - current signal: 'from_myvar'
SET DEBUG_SYNC= LEFT('now SIGNAL from_function_cut_here', 24);
SHOW VARIABLES LIKE 'DEBUG_SYNC';
Variable_name Value
debug_sync ON - current signal: 'from_function'
SET DEBUG_SYNC= 'now SIGNAL something';
SHOW VARIABLES LIKE 'DEBUG_SYNC';
Variable_name Value
debug_sync ON - current signal: 'something'
SET DEBUG_SYNC= 'now WAIT_FOR nothing TIMEOUT 0';
Warnings:
Warning #### debug sync point wait timed out
SET DEBUG_SYNC= 'now SIGNAL nothing';
SHOW VARIABLES LIKE 'DEBUG_SYNC';
Variable_name Value
debug_sync ON - current signal: 'nothing'
SET DEBUG_SYNC= 'now WAIT_FOR nothing TIMEOUT 0';
SET DEBUG_SYNC= 'now SIGNAL something EXECUTE 0';
SHOW VARIABLES LIKE 'DEBUG_SYNC';
Variable_name Value
debug_sync ON - current signal: 'nothing'
SET DEBUG_SYNC= 'now WAIT_FOR anotherthing TIMEOUT 0 EXECUTE 0';
SET DEBUG_SYNC= 'now HIT_LIMIT 1';
ERROR HY000: debug sync point hit limit reached
SET DEBUG_SYNC= 'RESET';
SHOW VARIABLES LIKE 'DEBUG_SYNC';
Variable_name Value
debug_sync ON - current signal: ''
SET DEBUG_SYNC= 'p1abcd SIGNAL s1 EXECUTE 2';
SET DEBUG_SYNC= 'p2abc SIGNAL s2 EXECUTE 2';
SET DEBUG_SYNC= 'p9abcdef SIGNAL s9 EXECUTE 2';
SET DEBUG_SYNC= 'p4a SIGNAL s4 EXECUTE 2';
SET DEBUG_SYNC= 'p5abcde SIGNAL s5 EXECUTE 2';
SET DEBUG_SYNC= 'p6ab SIGNAL s6 EXECUTE 2';
SET DEBUG_SYNC= 'p7 SIGNAL s7 EXECUTE 2';
SET DEBUG_SYNC= 'p8abcdef SIGNAL s8 EXECUTE 2';
SET DEBUG_SYNC= 'p3abcdef SIGNAL s3 EXECUTE 2';
SET DEBUG_SYNC= 'p4a TEST';
SHOW VARIABLES LIKE 'DEBUG_SYNC';
Variable_name Value
debug_sync ON - current signal: 's4'
SET DEBUG_SYNC= 'p1abcd TEST';
SHOW VARIABLES LIKE 'DEBUG_SYNC';
Variable_name Value
debug_sync ON - current signal: 's1'
SET DEBUG_SYNC= 'p7 TEST';
SHOW VARIABLES LIKE 'DEBUG_SYNC';
Variable_name Value
debug_sync ON - current signal: 's7'
SET DEBUG_SYNC= 'p9abcdef TEST';
SHOW VARIABLES LIKE 'DEBUG_SYNC';
Variable_name Value
debug_sync ON - current signal: 's9'
SET DEBUG_SYNC= 'p3abcdef TEST';
SHOW VARIABLES LIKE 'DEBUG_SYNC';
Variable_name Value
debug_sync ON - current signal: 's3'
SET DEBUG_SYNC= 'p1abcd CLEAR';
SET DEBUG_SYNC= 'p2abc CLEAR';
SET DEBUG_SYNC= 'p5abcde CLEAR';
SET DEBUG_SYNC= 'p6ab CLEAR';
SET DEBUG_SYNC= 'p8abcdef CLEAR';
SET DEBUG_SYNC= 'p9abcdef CLEAR';
SET DEBUG_SYNC= 'p3abcdef CLEAR';
SET DEBUG_SYNC= 'p4a CLEAR';
SET DEBUG_SYNC= 'p7 CLEAR';
SET DEBUG_SYNC= 'p1abcd TEST';
SHOW VARIABLES LIKE 'DEBUG_SYNC';
Variable_name Value
debug_sync ON - current signal: 's3'
SET DEBUG_SYNC= 'p7 TEST';
SHOW VARIABLES LIKE 'DEBUG_SYNC';
Variable_name Value
debug_sync ON - current signal: 's3'
SET DEBUG_SYNC= 'p9abcdef TEST';
SHOW VARIABLES LIKE 'DEBUG_SYNC';
Variable_name Value
debug_sync ON - current signal: 's3'
SET DEBUG_SYNC= 'RESET';
SHOW VARIABLES LIKE 'DEBUG_SYNC';
Variable_name Value
debug_sync ON - current signal: ''
CREATE USER mysqltest_1@localhost;
GRANT SUPER ON *.* TO mysqltest_1@localhost;
connect con1,localhost,mysqltest_1,,;
SET DEBUG_SYNC= 'RESET';
disconnect con1;
connection default;
DROP USER mysqltest_1@localhost;
CREATE USER mysqltest_2@localhost;
GRANT ALL ON *.* TO mysqltest_2@localhost;
REVOKE SUPER ON *.* FROM mysqltest_2@localhost;
connect con1,localhost,mysqltest_2,,;
SET DEBUG_SYNC= 'RESET';
ERROR 42000: Access denied; you need (at least one of) the SUPER privilege(s) for this operation
disconnect con1;
connection default;
DROP USER mysqltest_2@localhost;
SET DEBUG_SYNC= 'RESET';
DROP TABLE IF EXISTS t1;
CREATE TABLE t1 (c1 INT);
connect con1,localhost,root,,;
SET DEBUG_SYNC= 'before_lock_tables_takes_lock
SIGNAL opened WAIT_FOR flushed';
INSERT INTO t1 VALUES(1);
connection default;
SET DEBUG_SYNC= 'now WAIT_FOR opened';
SET DEBUG_SYNC= 'after_flush_unlock SIGNAL flushed';
FLUSH TABLE t1;
connection con1;
disconnect con1;
connection default;
DROP TABLE t1;
SET DEBUG_SYNC= 'RESET';
DROP TABLE IF EXISTS t1;
CREATE TABLE t1 (c1 INT) ENGINE=MyISAM;
INSERT INTO t1 VALUES (1);
SELECT GET_LOCK('mysqltest_lock', 100);
GET_LOCK('mysqltest_lock', 100)
1
connect con1,localhost,root,,;
# Sending:
UPDATE t1 SET c1=GET_LOCK('mysqltest_lock', 100);;
connect con2,localhost,root,,;
SET DEBUG_SYNC= 'wait_for_lock SIGNAL locked EXECUTE 2';
INSERT INTO t1 VALUES (1);
connection default;
SET DEBUG_SYNC= 'now WAIT_FOR locked';
SELECT RELEASE_LOCK('mysqltest_lock');
RELEASE_LOCK('mysqltest_lock')
1
connection con1;
# Reaping UPDATE
SELECT RELEASE_LOCK('mysqltest_lock');
RELEASE_LOCK('mysqltest_lock')
1
connection con2;
retrieve INSERT result.
disconnect con1;
disconnect con2;
connection default;
DROP TABLE t1;
SET DEBUG_SYNC= 'RESET';