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#
# WL#8161 Locking service for read/write named locks
#
CREATE FUNCTION service_get_read_locks RETURNS INT SONAME "LOCKING_SERVICE_LIB";
CREATE FUNCTION service_get_write_locks RETURNS INT SONAME "LOCKING_SERVICE_LIB";
CREATE FUNCTION service_release_locks RETURNS INT SONAME "LOCKING_SERVICE_LIB";
#
# 1: Test that calling the functions works, number of arguments,
# invalid argument type, invalid content (empty string)
#
SELECT service_get_read_locks();
ERROR HY000: Can't initialize function 'service_get_read_locks'; Requires at least three arguments: (namespace,lock(...),timeout).
SELECT service_get_read_locks('negative');
ERROR HY000: Can't initialize function 'service_get_read_locks'; Requires at least three arguments: (namespace,lock(...),timeout).
SELECT service_get_read_locks('negative', 'lock1');
ERROR HY000: Can't initialize function 'service_get_read_locks'; Requires at least three arguments: (namespace,lock(...),timeout).
SELECT service_get_read_locks( 1, 'lock1', 'lock2', 0);
ERROR HY000: Can't initialize function 'service_get_read_locks'; Wrong argument type - expected string.
SELECT service_get_read_locks( '', 'lock1', 'lock2', 0);
ERROR 42000: Incorrect locking service lock name ''.
SELECT service_get_read_locks('negative', 1, 'lock2', 0);
ERROR HY000: Can't initialize function 'service_get_read_locks'; Wrong argument type - expected string.
SELECT service_get_write_locks();
ERROR HY000: Can't initialize function 'service_get_write_locks'; Requires at least three arguments: (namespace,lock(...),timeout).
SELECT service_get_write_locks('negative');
ERROR HY000: Can't initialize function 'service_get_write_locks'; Requires at least three arguments: (namespace,lock(...),timeout).
SELECT service_get_write_locks('negative', 'lock1');
ERROR HY000: Can't initialize function 'service_get_write_locks'; Requires at least three arguments: (namespace,lock(...),timeout).
SELECT service_get_write_locks( 1, 'lock1', 'lock2', 0);
ERROR HY000: Can't initialize function 'service_get_write_locks'; Wrong argument type - expected string.
SELECT service_get_write_locks( '', 'lock1', 'lock2', 0);
ERROR 42000: Incorrect locking service lock name ''.
SELECT service_get_write_locks('negative', 1, 'lock2', 0);
ERROR HY000: Can't initialize function 'service_get_write_locks'; Wrong argument type - expected string.
SELECT service_get_write_locks('negative', '', 'lock2', 0);
ERROR 42000: Incorrect locking service lock name ''.
SELECT service_get_write_locks('negative', 'lock1', 1, 0);
ERROR HY000: Can't initialize function 'service_get_write_locks'; Wrong argument type - expected string.
SELECT service_get_write_locks('negative', 'lock1', '', 0);
ERROR 42000: Incorrect locking service lock name ''.
SELECT service_get_write_locks('negative', 'lock1', 'lock2', 'hello');
ERROR HY000: Can't initialize function 'service_get_write_locks'; Wrong argument type - expected integer.
SELECT service_release_locks();
ERROR HY000: Can't initialize function 'service_release_locks'; Requires one argument: (lock_namespace).
SELECT service_release_locks('negative', 'hello');
ERROR HY000: Can't initialize function 'service_release_locks'; Requires one argument: (lock_namespace).
SELECT service_release_locks( 1);
ERROR HY000: Can't initialize function 'service_release_locks'; Wrong argument type - expected string.
SELECT service_release_locks( '');
ERROR 42000: Incorrect locking service lock name ''.
# 2: Check simple positive cases and that service locks taken are roughly
# correct represented in performance_schema.metadata_locks
#
UPDATE performance_schema.setup_instruments SET enabled = 'NO', timed = 'YES';
TRUNCATE TABLE performance_schema.events_waits_current;
TRUNCATE TABLE performance_schema.events_waits_history_long;
UPDATE performance_schema.setup_instruments SET enabled = 'YES';
SELECT COUNT(*) = 0 AS expect_1 FROM performance_schema.metadata_locks
WHERE OBJECT_TYPE = 'LOCKING SERVICE';
expect_1
1
SELECT service_get_read_locks('pfs_check', 'lock1', 'lock2', 0);
service_get_read_locks('pfs_check', 'lock1', 'lock2', 0)
1
SELECT service_get_write_locks('pfs_check', 'lock3', 'lock4', 0);
service_get_write_locks('pfs_check', 'lock3', 'lock4', 0)
1
SELECT OBJECT_TYPE, OBJECT_SCHEMA, OBJECT_NAME, LOCK_TYPE, LOCK_DURATION,
LOCK_STATUS
FROM performance_schema.metadata_locks
WHERE OBJECT_TYPE = 'LOCKING SERVICE';
OBJECT_TYPE OBJECT_SCHEMA OBJECT_NAME LOCK_TYPE LOCK_DURATION LOCK_STATUS
LOCKING SERVICE pfs_check lock1 SHARED EXPLICIT GRANTED
LOCKING SERVICE pfs_check lock2 SHARED EXPLICIT GRANTED
LOCKING SERVICE pfs_check lock3 EXCLUSIVE EXPLICIT GRANTED
LOCKING SERVICE pfs_check lock4 EXCLUSIVE EXPLICIT GRANTED
SELECT service_release_locks('pfs_check');
service_release_locks('pfs_check')
1
SELECT COUNT(*) = 0 AS expect_1 FROM performance_schema.metadata_locks
WHERE OBJECT_TYPE = 'LOCKING SERVICE';
expect_1
1
SELECT COUNT(*) = 0 AS expect_1
FROM performance_schema.events_waits_history_long
WHERE OBJECT_TYPE = 'LOCKING SERVICE';
expect_1
1
#
# 3: Test taking and releasing of locks in two namespaces
SELECT service_get_write_locks("namespace1", "lock1", 60);
service_get_write_locks("namespace1", "lock1", 60)
1
SELECT service_get_write_locks("namespace2", "lock1", "lock2", 60);
service_get_write_locks("namespace2", "lock1", "lock2", 60)
1
SELECT service_release_locks("namespace1");
service_release_locks("namespace1")
1
SELECT service_release_locks("namespace2");
service_release_locks("namespace2")
1
#
# 4: Test that another connection can be blocked and
# impact on certain tables in performance_schema
# 4.0: Baseline checks
# Per performance_schema content no service locks in the moment
SELECT COUNT(*) = 0 AS expect_1 FROM performance_schema.metadata_locks
WHERE OBJECT_TYPE = 'LOCKING SERVICE';
expect_1
1
# Per performance_schema no current wait for getting a service lock
SELECT COUNT(*) = 0 AS expect_1 FROM performance_schema.events_waits_current
WHERE OBJECT_TYPE = 'LOCKING SERVICE';
expect_1
1
# Per performance_schema no historic wait for getting a service lock
# because TRUNCATE of events_waits_history_long
SELECT COUNT(*) = 0 AS expect_1
FROM performance_schema.events_waits_history_long
WHERE OBJECT_TYPE = 'LOCKING SERVICE';
expect_1
1
# 4.1: Test that another connection gets blocked.
SELECT service_get_write_locks("namespace1", "lock1", "lock2", 60);
service_get_write_locks("namespace1", "lock1", "lock2", 60)
1
connect con1,localhost,root;
SELECT service_get_write_locks("namespace1", "lock1", 1);
ERROR HY000: Service lock wait timeout exceeded.
SELECT service_get_write_locks("namespace1", "lock2", 1);
ERROR HY000: Service lock wait timeout exceeded.
SELECT service_get_read_locks("namespace1", "lock1", 1);
ERROR HY000: Service lock wait timeout exceeded.
SELECT service_get_write_locks("namespace1", "lock1", 0);
ERROR HY000: Service lock wait timeout exceeded.
SELECT service_get_write_locks("namespace1", "lock2", 0);
ERROR HY000: Service lock wait timeout exceeded.
SELECT service_get_read_locks("namespace1", "lock1", 0);
ERROR HY000: Service lock wait timeout exceeded.
# 4.2: The content of performance_schema.events_waits_history_long
# should show that we have waited three times including correct
# service lock namespace and lock name.
SELECT OBJECT_SCHEMA, OBJECT_NAME, OBJECT_TYPE, OPERATION
FROM performance_schema.events_waits_history_long
WHERE OBJECT_TYPE = 'LOCKING SERVICE';
OBJECT_SCHEMA OBJECT_NAME OBJECT_TYPE OPERATION
namespace1 lock1 LOCKING SERVICE metadata lock
namespace1 lock1 LOCKING SERVICE metadata lock
namespace1 lock2 LOCKING SERVICE metadata lock
# Per performance_schema there is no current wait for getting a
# service lock because our attempt already timed out.
SELECT COUNT(*) = 0 AS expect_1 FROM performance_schema.events_waits_current
WHERE OBJECT_TYPE = 'LOCKING SERVICE';
expect_1
1
# 4.3: Show the impact of waiting for getting a service lock on
# content of the processlist and performance_schema
SELECT service_get_write_locks("namespace1", "lock1", 60);
connection default;
# One waiting session in information_schema.processlist
SELECT COUNT(*) = 1 AS expect_1 FROM information_schema.processlist
WHERE state = 'Waiting for locking service lock';
expect_1
1
# Per performance_schema one current wait for getting a service lock
SELECT OBJECT_SCHEMA, OBJECT_NAME, OBJECT_TYPE, OPERATION
FROM performance_schema.events_waits_current
WHERE OBJECT_TYPE = 'LOCKING SERVICE';
OBJECT_SCHEMA OBJECT_NAME OBJECT_TYPE OPERATION
namespace1 lock1 LOCKING SERVICE metadata lock
# Per performance_schema six waits in history
SELECT COUNT(*) = 3 AS expect_1
FROM performance_schema.events_waits_history_long
WHERE OBJECT_TYPE = 'LOCKING SERVICE';
expect_1
1
# 4.4: Show the impact of releasing and getting a service lock on
# content of the processlist and performance_schema
SELECT service_release_locks("namespace1");
service_release_locks("namespace1")
1
connection con1;
service_get_write_locks("namespace1", "lock1", 60)
1
# No waiting session in information_schema.processlist
SELECT COUNT(*) = 0 AS expect_1 FROM information_schema.processlist
WHERE state = 'Waiting for locking service lock';
expect_1
1
# Per performance_schema no current wait for getting a service lock
SELECT COUNT(*) = 0 AS expect_1 FROM performance_schema.events_waits_current
WHERE OBJECT_TYPE = 'LOCKING SERVICE';
expect_1
1
# Per performance_schema now seven waits in history
SELECT COUNT(*) = 4 AS expect_1
FROM performance_schema.events_waits_history_long
WHERE OBJECT_TYPE = 'LOCKING SERVICE';
expect_1
1
SELECT service_release_locks("namespace1");
service_release_locks("namespace1")
1
#
# 5: Test atomic acquire.
connection default;
SELECT service_get_write_locks('holder_name_space',
'first', 'middle', 'last', 1);
service_get_write_locks('holder_name_space',
'first', 'middle', 'last', 1)
1
connection con1;
SELECT service_get_write_locks('holder_name_space',
'first', 'l2_1', 'l3_1', 0);
ERROR HY000: Service lock wait timeout exceeded.
SELECT service_get_write_locks('holder_name_space',
'l1_2', 'middle', 'l3_2', 0);
ERROR HY000: Service lock wait timeout exceeded.
SELECT service_get_write_locks('holder_name_space',
'l1_3', 'l2_3', 'last', 0);
ERROR HY000: Service lock wait timeout exceeded.
SELECT object_schema, object_name, lock_type, lock_status
FROM performance_schema.metadata_locks
WHERE OBJECT_TYPE = 'LOCKING SERVICE';
object_schema object_name lock_type lock_status
holder_name_space first EXCLUSIVE GRANTED
holder_name_space last EXCLUSIVE GRANTED
holder_name_space middle EXCLUSIVE GRANTED
disconnect con1;
connection default;
SELECT service_release_locks("holder_name_space");
service_release_locks("holder_name_space")
1
#
# 6: Mixed tests
# They are partial logical duplicates of the corresponding unit test.
connection default;
connect holder, localhost, root;
connection holder;
connect requestor, localhost, root;
connection requestor;
#
# 6.1: Check maximum supported name_space length.
connection holder;
SELECT service_get_write_locks(RPAD('holder_name_space_', 64, 'a'),
'l1', 'l2', 'l3', 0) AS col1;
col1
1
SELECT service_release_locks(RPAD('holder_name_space_', 64, 'a')) AS col1;
col1
1
SELECT service_get_write_locks(RPAD('holder_name_space_', 65, 'a'),
'l1', 'l2', 'l3', 0) AS col1;
ERROR 42000: Incorrect locking service lock name 'holder_name_space_aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa'.
#
# 6.2: Check maximum supported lock name length at several positions
SELECT service_get_write_locks('holder_name_space',
RPAD('l1_', 64, 'a'), RPAD('l2_', 64, 'a'), RPAD('l3_', 64, 'a'), 0) AS col1;
col1
1
SELECT service_release_locks('holder_name_space') AS col1;
col1
1
SELECT service_get_write_locks('holder_name_space',
RPAD('l1_', 65, 'a'), 'l2_1', 'l3_1', 0) AS col1;
ERROR 42000: Incorrect locking service lock name 'l1_aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa'.
SELECT service_get_write_locks('holder_name_space',
'l1_2', RPAD('l2_', 65, 'a'), 'l3_2', 0) AS col1;
ERROR 42000: Incorrect locking service lock name 'l2_aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa'.
SELECT service_get_write_locks('holder_name_space',
'l1_3', 'l2_3', RPAD('l3_', 65, 'a'), 0) AS col1;
ERROR 42000: Incorrect locking service lock name 'l3_aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa'.
#
# 6.3: Check that none of the failing (ER_LOCKING_SERVICE_WRONG_NAME)
# statements above requesting several locks got any lock at all.
connection requestor;
SELECT service_get_write_locks('holder_name_space',
'l1_1', 'l2_1', 'l3_1',
'l1_2', 'l2_2', 'l3_2',
'l1_3', 'l2_3', 'l3_3', 1) AS col1;
col1
1
SELECT service_release_locks('holder_name_space') AS col1;
col1
1
# Reveal that there are no locks left over.
SELECT COUNT(*) = 0 AS expect_1 FROM performance_schema.metadata_locks
WHERE OBJECT_TYPE = 'LOCKING SERVICE';
expect_1
1
#
# 6.4: Check that comparison of locks works correct.
connection holder;
SELECT service_get_write_locks('holder_name_space', 'lock', 0) AS col1;
col1
1
connection requestor;
SELECT service_get_write_locks('holder_name_space', 'lock', 0) AS col1;
ERROR HY000: Service lock wait timeout exceeded.
# 6.4.1: Variation of lock namespace in get_write_lock.
SELECT service_get_write_locks('holder_name_space ', 'lock', 0) AS col1;
col1
1
SELECT service_release_locks('holder_name_space ') AS col1;
col1
1
SELECT service_get_write_locks(' holder_name_space', 'lock', 0) AS col1;
col1
1
SELECT service_release_locks(' holder_name_space') AS col1;
col1
1
SELECT service_get_write_locks('holder_name_spac', 'lock', 0) AS col1;
col1
1
SELECT service_release_locks('holder_name_spac') AS col1;
col1
1
SELECT service_get_write_locks('older_name_space', 'lock', 0) AS col1;
col1
1
SELECT service_release_locks('older_name_space') AS col1;
col1
1
# 6.4.2: Variation of lock name in get_write_lock.
SELECT service_get_write_locks('holder_name_space', 'lock ', 0) AS col1;
col1
1
SELECT service_release_locks('holder_name_space') AS col1;
col1
1
SELECT service_get_write_locks('holder_name_space', ' lock', 0) AS col1;
col1
1
SELECT service_release_locks('holder_name_space') AS col1;
col1
1
SELECT service_get_write_locks('holder_name_space', 'loc', 0) AS col1;
col1
1
SELECT service_release_locks('holder_name_space') AS col1;
col1
1
SELECT service_get_write_locks('holder_name_space', 'ock', 0) AS col1;
col1
1
SELECT service_release_locks('holder_name_space') AS col1;
col1
1
# 6.4.3: Variation of lock namespace in release_locks
connection holder;
SELECT service_release_locks('holder_name_space ') AS col1;
col1
1
connection requestor;
SELECT service_get_write_locks('holder_name_space', 'lock', 0) AS col1;
ERROR HY000: Service lock wait timeout exceeded.
connection holder;
SELECT service_release_locks(' holder_name_space') AS col1;
col1
1
connection requestor;
SELECT service_get_write_locks('holder_name_space', 'lock', 0) AS col1;
ERROR HY000: Service lock wait timeout exceeded.
connection holder;
SELECT service_release_locks('holder_name_spac') AS col1;
col1
1
connection requestor;
SELECT service_get_write_locks('holder_name_space', 'lock', 0) AS col1;
ERROR HY000: Service lock wait timeout exceeded.
connection holder;
SELECT service_release_locks('older_name_spac') AS col1;
col1
1
connection requestor;
SELECT service_get_write_locks('holder_name_space', 'lock', 0) AS col1;
ERROR HY000: Service lock wait timeout exceeded.
connection holder;
SELECT service_release_locks('holder_name_space') AS col1;
col1
1
# Reveal that there are no locks left over.
SELECT COUNT(*) = 0 AS expect_1 FROM performance_schema.metadata_locks
WHERE OBJECT_TYPE = 'LOCKING SERVICE';
expect_1
1
#
# 6.5: How get values assigned to timeout interpreted.
# 6.5.1: timeout = 0 -- No waiting
connection holder;
SELECT service_get_write_locks('holder_name_space', 'lock', 0) AS col1;
col1
1
connection requestor;
SELECT service_get_write_locks('holder_name_space', 'lock', 0) AS col1;
ERROR HY000: Service lock wait timeout exceeded.
# 6.5.2: timeout = -1 -- Wait endless similar to user locks
connection requestor;
Send the statement and reap the result later.
SELECT service_get_write_locks('holder_name_space', 'lock', -1) AS col1;
connection default;
# Check that "requestor" waits longer than one second.
connection holder;
SELECT service_release_locks('holder_name_space') AS col1;
col1
1
connection requestor;
Reap the result of the statement sent earlier.
col1
1
SELECT service_release_locks('holder_name_space') AS col1;
col1
1
# 6.5.3: timeout = 1.0E-5 -- Value does not get accepted.
connection holder;
SELECT service_get_write_locks('holder_name_space', 'lock', 0) AS col1;
col1
1
connection requestor;
SELECT service_get_write_locks('holder_name_space', 'lock', 1.0E-5) AS col1;
ERROR HY000: Can't initialize function 'service_get_write_locks'; Wrong argument type - expected integer.
connection holder;
SELECT service_release_locks('holder_name_space') AS col1;
col1
1
# Reveal that there are no locks left over.
SELECT COUNT(*) = 0 AS expect_1 FROM performance_schema.metadata_locks
WHERE OBJECT_TYPE = 'LOCKING SERVICE';
expect_1
1
#
# 6.6: Check that the same locks can be requested several times.
connection holder;
# 6.6.1: Two times in same UDF call.
SELECT service_get_write_locks('holder_name_space', 'l1', 'l1', 0) AS col1;
col1
1
# We have two entries for the same lock.
# Reveal that there are two locks.
SELECT COUNT(*) = 2 AS expect_1 FROM performance_schema.metadata_locks
WHERE OBJECT_TYPE = 'LOCKING SERVICE';
expect_1
1
# 6.6.2: Two times per two UDF calls in same statement.
SELECT service_get_write_locks('holder_name_space', 'l2', 0) AS col1,
service_get_write_locks('holder_name_space', 'l2', 0);
col1 service_get_write_locks('holder_name_space', 'l2', 0)
1 1
# 6.6.3: Two times per one UDF call per statement.
SELECT service_get_write_locks('holder_name_space', 'l3', 0) AS col1;
col1
1
SELECT service_get_write_locks('holder_name_space', 'l3', 0) AS col1;
col1
1
# Reveal that there are six locks.
SELECT COUNT(*) = 6 AS expect_1 FROM performance_schema.metadata_locks
WHERE OBJECT_TYPE = 'LOCKING SERVICE';
expect_1
1
SELECT service_release_locks('holder_name_space') AS col1;
col1
1
# Reveal that there are no locks left over.
SELECT COUNT(*) = 0 AS expect_1 FROM performance_schema.metadata_locks
WHERE OBJECT_TYPE = 'LOCKING SERVICE';
expect_1
1
#
# 6.7: Taking several locks in one statement is supported and "holder"
# will do that now. Reveal that all are blocked.
connection holder;
SELECT service_get_write_locks('holder_name_space',
'first', 'middle', 'last', 0) AS col1;
col1
1
connection requestor;
SELECT service_get_write_locks('holder_name_space',
'first', 'l2_1', 'l3_1', 0) AS col1;
ERROR HY000: Service lock wait timeout exceeded.
SELECT service_get_write_locks('holder_name_space',
'l1_2', 'middle', 'l3_2', 0) AS col1;
ERROR HY000: Service lock wait timeout exceeded.
SELECT service_get_write_locks('holder_name_space',
'l1_3', 'l2_3', 'last', 0) AS col1;
ERROR HY000: Service lock wait timeout exceeded.
#
# 6.8: Check that none of the failing (ER_LOCKING_SERVICE_TIMEOUT)
# statements above requesting several locks got any lock at all.
connection holder;
SELECT service_get_write_locks('holder_name_space',
'l1_1', 'l2_1', 'l3_1',
'l1_2', 'l2_2', 'l3_2',
'l1_3', 'l2_3', 'l3_3', 0) AS col1;
col1
1
SELECT service_release_locks('holder_name_space') AS col1;
col1
1
connection requestor;
SELECT service_release_locks('holder_name_space') AS col1;
col1
1
# Reveal that there are no locks left over.
SELECT COUNT(*) = 0 AS expect_1 FROM performance_schema.metadata_locks
WHERE OBJECT_TYPE = 'LOCKING SERVICE';
expect_1
1
#
# 6.9: Reveal that a
# - more or less smooth loss of the connection frees the special lock
# - ROLLBACK of some transaction during that a special lock was taken
# does not free that special lock
# held by that connection.
# 6.9.1: ROLLBACK of "holder".
connection holder;
SET SESSION AUTOCOMMIT = OFF;
COMMIT;
SELECT service_get_write_locks('holder_name_space', 'lock', 0) AS col1;
col1
1
connection requestor;
Send the statement and reap the result later.
SELECT service_get_write_locks('holder_name_space', 'lock', 10) AS col1;
connection holder;
# Check that "requestor" waits.
ROLLBACK;
SET @aux = 1;
SELECT service_release_locks('holder_name_space') AS col1;
col1
1
connection requestor;
Reap the result of the statement sent earlier.
col1
1
SELECT service_release_locks('holder_name_space') AS col1;
col1
1
# 6.9.2: Disconnect of "holder" in mysqltest.
connection holder;
SELECT service_get_write_locks('holder_name_space', 'lock', 0) AS col1;
col1
1
connection requestor;
Send the statement and reap the result later.
SELECT service_get_write_locks('holder_name_space', 'lock', 10) AS col1;
connection holder;
# Check that "requestor" waits.
disconnect holder;
connection requestor;
Reap the result of the statement sent earlier.
col1
1
SELECT service_release_locks('holder_name_space') AS col1;
col1
1
# 6.9.3: COMMMIT WORK RELEASE of "holder".
connect holder, localhost, root;
connection holder;
SELECT service_get_write_locks('holder_name_space', 'lock', 0) AS col1;
col1
1
connection requestor;
Send the statement and reap the result later.
SELECT service_get_write_locks('holder_name_space', 'lock', 10) AS col1;
connection holder;
# Check that "requestor" waits.
COMMIT WORK RELEASE;
connection requestor;
Reap the result of the statement sent earlier.
col1
1
SELECT service_release_locks('holder_name_space') AS col1;
col1
1
disconnect holder;
# 6.9.4: KILL <session of "holder"> issued by "holder"
connect holder, localhost, root;
connection holder;
SELECT service_get_write_locks('holder_name_space', 'lock', 0) AS col1;
col1
1
connection requestor;
Send the statement and reap the result later.
SELECT service_get_write_locks('holder_name_space', 'lock', 10) AS col1;
connection holder;
# Check that "requestor" waits.
SET @aux = <holder_id>;
KILL @aux;
ERROR 70100: Query execution was interrupted
connection requestor;
Reap the result of the statement sent earlier.
col1
1
SELECT service_release_locks('holder_name_space') AS col1;
col1
1
disconnect holder;
# 6.9.5: KILL <session of "holder"> issued by "default"
connect holder, localhost, root;
connection holder;
SELECT service_get_write_locks('holder_name_space', 'lock', 0) AS col1;
col1
1
connection requestor;
Send the statement and reap the result later.
SELECT service_get_write_locks('holder_name_space', 'lock', 10) AS col1;
connection default;
# Check that "requestor" waits.
KILL <holder_id>;
connection requestor;
Reap the result of the statement sent earlier.
col1
1
SELECT service_release_locks('holder_name_space') AS col1;
col1
1
disconnect holder;
#
# 6.10: Are all locks in the same space == We take them "read" or "write"
# or is there a space for "read" lock and one for "write" locks.
# The first is valid.
# Can we upgrade (read->write, yes) or downgrade (write-> read, no)
# such locks.
# 6.10.1: holder: get_read_lock
# get_write_lock
# requestor: get_read_lock -- will wait
connect holder, localhost, root;
connection holder;
SELECT service_get_read_locks('holder_name_space', 'lock', 0) AS col1;
col1
1
SELECT service_get_write_locks('holder_name_space', 'lock', 0) AS col1;
col1
1
connection requestor;
Send the statement and reap the result later.
SELECT service_get_read_locks('holder_name_space', 'lock', 10) AS col1;
connection default;
# Check that "requestor" waits.
connection holder;
SELECT service_release_locks('holder_name_space') AS col1;
col1
1
connection requestor;
Reap the result of the statement sent earlier.
col1
1
SELECT service_release_locks('holder_name_space') AS col1;
col1
1
# 6.10.2: holder: get_write_lock
# get_read_lock
# requestor: get_read_lock -- will wait
connection holder;
SELECT service_get_write_locks('holder_name_space', 'lock', 0) AS col1;
col1
1
SELECT service_get_read_locks('holder_name_space', 'lock', 0) AS col1;
col1
1
connection requestor;
Send the statement and reap the result later.
SELECT service_get_read_locks('holder_name_space', 'lock', 10) AS col1;
connection default;
# Check that "requestor" waits.
connection holder;
SELECT service_release_locks('holder_name_space') AS col1;
col1
1
connection requestor;
Reap the result of the statement sent earlier.
col1
1
SELECT service_release_locks('holder_name_space') AS col1;
col1
1
#
# 6.11: Interleaved stuff
# 6.11.1: It does not count who got the first "read" lock when trying to
# to get a "write" lock later.
# requestor: get_read_lock
# holder: get_read_lock
# requestor: get_write_lock -- will wait
connection requestor;
SELECT service_get_read_locks('holder_name_space', 'lock', 0) AS col1;
col1
1
connection holder;
SELECT service_get_read_locks('holder_name_space', 'lock', 0) AS col1;
col1
1
connection requestor;
Send the statement and reap the result later.
SELECT service_get_write_locks('holder_name_space', 'lock', 10) AS col1;
connection default;
# Check that "requestor" waits.
connection holder;
SELECT service_release_locks('holder_name_space') AS col1;
col1
1
connection requestor;
Reap the result of the statement sent earlier.
col1
1
SELECT service_release_locks('holder_name_space') AS col1;
col1
1
# 6.11.2: It does not count who got the last "read" lock when trying to
# to get a "write" lock later.
# holder: get_read_lock
# requestor: get_read_lock
# requestor: get_write_lock -- will wait
connection holder;
SELECT service_get_read_locks('holder_name_space', 'lock', 0) AS col1;
col1
1
connection requestor;
SELECT service_get_read_locks('holder_name_space', 'lock', 0) AS col1;
col1
1
connection requestor;
Send the statement and reap the result later.
SELECT service_get_write_locks('holder_name_space', 'lock', 10) AS col1;
connection default;
# Check that "requestor" waits.
connection holder;
SELECT service_release_locks('holder_name_space') AS col1;
col1
1
connection requestor;
Reap the result of the statement sent earlier.
col1
1
SELECT service_release_locks('holder_name_space') AS col1;
col1
1
# 6.11.3: There seems to be no lock free (micro) phase during upgrading.
# holder: get_read_lock
# requestor: get_write_lock -- will wait
# holder: get_write_lock
# requestor: -- will stay waiting
connection holder;
SELECT service_get_read_locks('holder_name_space', 'lock', 0) AS col1;
col1
1
connection requestor;
Send the statement and reap the result later.
SELECT service_get_write_locks('holder_name_space', 'lock', 10) AS col1;
connection default;
# Check that "requestor" waits.
connection holder;
SELECT service_get_write_locks('holder_name_space', 'lock', 10) AS col1;
col1
1
SET @aux = 1;
connection default;
# Check that "requestor" waits.
connection holder;
SELECT service_release_locks('holder_name_space') AS col1;
col1
1
connection requestor;
Reap the result of the statement sent earlier.
col1
1
SELECT service_release_locks('holder_name_space') AS col1;
col1
1
#
# 6.12: A session is able to free own locks but not locks held by
# by other sessions.
# holder: get_read_lock l1
# default: get_read_lock l1, l2
# requestor: get_write_lock l1 -- will wait
# default: free locks (l1, l2)
# requestor: -- will stay waiting
connection holder;
SELECT service_get_read_locks('holder_name_space', 'l1', 0) AS col1;
col1
1
connection default;
SELECT service_get_read_locks('holder_name_space', 'l1', 'l2', 0) AS col1;
col1
1
connection requestor;
Send the statement and reap the result later.
SELECT service_get_write_locks('holder_name_space', 'l1', 10) AS col1;
connection default;
# Check that "requestor" waits.
SELECT service_release_locks('holder_name_space') AS col1;
col1
1
SET @aux = 1;
# Check that "requestor" waits.
connection holder;
SELECT service_release_locks('holder_name_space') AS col1;
col1
1
connection requestor;
Reap the result of the statement sent earlier.
col1
1
SELECT service_release_locks('holder_name_space') AS col1;
col1
1
#
# 6.13: The statement running the UDF fails because of reason outside UDF.
# No lock is taken.
connection holder;
CREATE TEMPORARY TABLE t1 AS SELECT 1 AS col1;
CREATE TEMPORARY TABLE t1
AS SELECT service_get_write_locks('holder_name_space', 'lock', 0) AS col1;
ERROR 42S01: Table 't1' already exists
connection requestor;
SELECT service_get_write_locks('holder_name_space', 'lock', 0) AS col1;
col1
1
SELECT service_release_locks('holder_name_space') AS col1;
col1
1
connection holder;
DROP TEMPORARY TABLE t1;
SELECT COUNT(*) = 0 AS expect_1 FROM performance_schema.metadata_locks
WHERE OBJECT_TYPE = 'LOCKING SERVICE';
expect_1
1
#
# 6.14: The UDF's are atomic per call and not per statement where they
# are invoked. Locks are taken as long as it works and they will
# be not freed if the statement finally fails.
connection holder;
SELECT service_get_write_locks('holder_name_space', 'l2', 0) AS col1;
col1
1
connection default;
SELECT COUNT(*) = 1 AS expect_1 FROM performance_schema.metadata_locks
WHERE OBJECT_TYPE = 'LOCKING SERVICE';
expect_1
1
connection requestor;
SELECT service_get_write_locks('holder_name_space', 'l1', 0) AS col1,
service_get_write_locks('holder_name_space', 'l2', 0);
ERROR HY000: Service lock wait timeout exceeded.
connection default;
SELECT COUNT(*) = 2 AS expect_1 FROM performance_schema.metadata_locks
WHERE OBJECT_TYPE = 'LOCKING SERVICE';
expect_1
1
connection requestor;
SELECT service_release_locks('holder_name_space') AS col1;
col1
1
connection holder;
SELECT service_release_locks('holder_name_space') AS col1;
col1
1
#
# 6.15: The statement invoking a failing UDF call needs to fail too.
# The specific is here that we run the UDF for several rows.
# The statement should have zero impact on data (InnoDB assumed).
connection holder;
CREATE TABLE t1 (col1 VARCHAR(10));
INSERT INTO t1 VALUES ('l1'), ('l2'), ('l3');
SELECT service_get_write_locks('holder_name_space', 'l2', 0);
service_get_write_locks('holder_name_space', 'l2', 0)
1
# 6.15.1: CREATE TEMPORARY TABLE ... AS SELECT ... UDF ... FROM ...
connection requestor;
CREATE TEMPORARY TABLE t2 ENGINE = InnoDB AS
SELECT service_get_write_locks('holder_name_space', col1, 0) AS col1 FROM t1
ORDER BY col1;
ERROR HY000: Service lock wait timeout exceeded.
DROP TEMPORARY TABLE t2;
ERROR 42S02: Unknown table 'test.t2'
# There are two locks left over.
# One taken by holder and one by requestor though his statement failed.
# The latter is caused by some UDF limitation.
SELECT COUNT(*) = 2 AS expect_1 FROM performance_schema.metadata_locks
WHERE OBJECT_TYPE = 'LOCKING SERVICE';
expect_1
1
SELECT service_release_locks('holder_name_space') AS col1;
col1
1
connection requestor;
SELECT service_release_locks('holder_name_space') AS col1;
col1
1
connection holder;
SELECT service_release_locks('holder_name_space') AS col1;
col1
1
DROP TABLE t1;
# Reveal that there are no locks left over.
SELECT COUNT(*) = 0 AS expect_1 FROM performance_schema.metadata_locks
WHERE OBJECT_TYPE = 'LOCKING SERVICE';
expect_1
1
connection default;
disconnect holder;
disconnect requestor;
# Check that "requestor" and "holder" are gone.
#
# Bug#21286221: DEBUG SERVER CRASHES ON RESET SLAVE WITH
# LOCKED VERSION TOKEN
#
SELECT service_get_write_locks('holder_name_space', 'lock', 0);
service_get_write_locks('holder_name_space', 'lock', 0)
1
FLUSH TABLES;
SELECT service_release_locks('holder_name_space');
service_release_locks('holder_name_space')
1
DROP FUNCTION service_get_read_locks;
DROP FUNCTION service_get_write_locks;
DROP FUNCTION service_release_locks;