mysql-test/r/func_math.result:
Add test for Bug #58137
mysql-test/t/func_math.test:
Add test for Bug #58137
sql/field.cc:
Skip calling my_gcvt() if we are trying to insert a double into a char(0) column.
breaks SBR
The problem was that DROP DATABASE ignored any metadata locks on stored
functions and procedures held by other connections. This made it
possible for DROP DATABASE to drop functions/procedures that were in use
by other connections and therefore break statement based replication.
(DROP DATABASE could appear in the binlog before a statement using a
dropped function/procedure.)
This problem was an issue left unresolved by the patch for Bug#30977
where metadata locks for stored functions/procedures were introduced.
This patch fixes the problem by making sure DROP DATABASE takes
exclusive metadata locks on all stored functions/procedures to be
dropped.
Test case added to sp-lock.test.
breaks SBR
This pre-requisite patch refactors the code for dropping tables, used
by DROP TABLE and DROP DATABASE. The patch moves the code for acquiring
metadata locks out of mysql_rm_table_part2() and makes it the
responsibility of the caller. This in preparation of changing the
DROP DATABASE implementation to acquire all metadata locks before any
changes are made. mysql_rm_table_part2() is renamed
mysql_rm_table_no_locks() to reflect the change.
during EXPLAIN
Before the patch, send_eof() of some subclasses of
select_result (e.g., select_send::send_eof()) could
handle being called after an error had occured while others
could not. The methods that were not well-behaved would trigger
an ASSERT on debug builds. Release builds were not affected.
Consider the following query as an example for how the ASSERT
could be triggered:
A user without execute privilege on f() does
SELECT MAX(key1) INTO @dummy FROM t1 WHERE f() < 1;
resulting in "ERROR 42000: execute command denied to user..."
The server would end the query by calling send_eof(). The
fact that the error had occured would make the ASSERT trigger.
select_dumpvar::send_eof() was the offending method in the
bug report, but the problem also applied to other
subclasses of select_result. This patch uniforms send_eof()
of all subclasses of select_result to handle being called
after an error has occured.
mysql-test/r/not_embedded_server.result:
Added test for BUG#54812
mysql-test/t/not_embedded_server.test:
Added test for BUG#54812
sql/sql_class.cc:
send_eof() of all subclasses of select_result can now handle being
called after an error has occured.
sql/sql_insert.cc:
send_eof() of all subclasses of select_result can now handle being
called after an error has occured.
Also fix call to abort() in select_create::send_eof(), which was supposed to abort the result set, not terminate the server. This call to abort() should have been changed when the function was renamed from abort_result_set() but was forgotten. New test case added by BUG#54812 covered this line and terminated server.
sql/sql_prepare.cc:
send_eof() of all subclasses of select_result can now handle being
called after an error has occured.
sql/sql_update.cc:
send_eof() of all subclasses of select_result can now handle being
called after an error has occured.
breaks SBR
This pre-requisite patch removes obsolete and dead code used to remove
raid subdirectories and files during DROP DATABASE.
Other parts of the raid code have already been removed in WL#5498
and the support for MyISAM raid tables was removed in 5.0.
structure buffer).
This is a follow-up for WL#4435. The bug actually existed not only
MYSQL_TYPE_DATETIME type. The problem was that Item_param::set_value()
was written in an assumption that it's working with expressions, i.e.
with basic data types.
There are two different quick fixes here:
a) Change Item_param::make_field() -- remove setting of
Send_field::length, Send_field::charsetnr, Send_field::flags and
Send_field::type.
That would lead to marshalling all data using basic types to the client
(MYSQL_TYPE_LONGLONG, MYSQL_TYPE_DOUBLE, MYSQL_TYPE_STRING and
MYSQL_TYPE_NEWDECIMAL). In particular, that means, DATETIME would be
sent as MYSQL_TYPE_STRING, TINYINT -- as MYSQL_TYPE_LONGLONG, etc.
That could be Ok for the client, because the client library does
reverse conversion automatically (the client program would see DATETIME
as MYSQL_TIME object). However, there is a problem with metadata --
the metadata would be wrong (misleading): it would say that DATETIME is
marshaled as MYSQL_TYPE_DATETIME, not as MYSQL_TYPE_STRING.
b) Set Item_param::param_type properly to actual underlying field type.
That would lead to double conversion inside the server: for example,
MYSQL_TIME-object would be converted into STRING-object
(in Item_param::set_value()), and then converted back to MYSQL_TIME-object
(in Item_param::send()).
The data however would be marshalled more properly, and also metadata would
be correct.
This patch implements b).
There is also a possibility to avoid double conversion either by clonning
the data field, or by storing a reference to it and using it on Item::send()
time. That requires more work and might be done later.
network when a query was slow.
When a query is slow, sent a special flag to the client
indicating this fact.
Add a test case.
Implement review comments.
include/mysql_com.h:
Clear SERVER_QUERY_WAS_SLOW at end of each statement.
Since this patch removes the technique when
thd->server_status is modified briefly only to
execute my_eof(), reset more server status
bit that may remain in the status from
execution of the previous statement.
sql/protocol.cc:
Always use thd->server_status to
in net_* functions to send the latest
status to the client.
sql/sp_head.cc:
Calculate if a query was slow before
sending EOF packet.
sql/sql_cursor.cc:
Remove juggling with thd->server_status.
The extra status bits are reset at
start of the next statement.
sql/sql_db.cc:
Remove juggling with thd->server_status.
The extra status bits are reset at
start of the next statement.
sql/sql_error.cc:
Remove m_server_status member,
it's not really part of the Diagnostics_area.
sql/sql_error.h:
Remove server_status member, it's
not part of the Diagnostics_area.
The associated hack is removed as well.
sql/sql_parse.cc:
Do not calculate if a query was
slow twice. Use a status flag in thd->server_status.
tests/mysql_client_test.c:
Add a test case for Bug#57058.
Check that the status is present
at the client, when sent.
Text conflict in mysql-test/suite/perfschema/r/dml_setup_instruments.result
Text conflict in mysql-test/suite/perfschema/r/global_read_lock.result
Text conflict in mysql-test/suite/perfschema/r/server_init.result
Text conflict in mysql-test/suite/perfschema/t/global_read_lock.test
Text conflict in mysql-test/suite/perfschema/t/server_init.test
Before this fix, file io for the binary log file was not accounted properly,
and showed no io at all.
This bug was due to the following issues:
1) file io for the binlog was instrumented:
- sometime as "wait/io/file/sql/binlog"
- sometime as "wait/io/file/sql/MYSQL_LOG"
leading to inconsistent event_names.
2) the binlog file itself was using an IO_CACHE,
but the IO_CACHE implementation in mysys/mf_iocache.c was
not instrumented to make performance schema calls to record file io.
3) The "wait/io/file/sql/MYSQL_LOG" instrumentation was used
for several log files, such as:
- the binary log
- the slow log
- the query log
which caused file io in these different log files to be accounted
against the same instrument.
The instrumentation needs to have a finer grain and report io
in different event_names, because each file really serves a different purpose.
With this fix:
- the IO_CACHE implementation is now instrumented
- the "wait/io/file/sql/MYSQL_LOG" instrument has been removed
- binlog io is now always instrumented with "wait/io/file/sql/binlog"
- the slow log is instrumented with a new name, "wait/io/file/sql/slow_log"
- the query log is instrumented with a new name, "wait/io/file/sql/query_log"
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.
mysql-test/include/check_ftwrl_compatible.inc:
Added helper script which allows to check that a statement is
compatible with FLUSH TABLES WITH READ LOCK.
mysql-test/include/check_ftwrl_incompatible.inc:
Added helper script which allows to check that a statement is
incompatible with FLUSH TABLES WITH READ LOCK.
mysql-test/include/handler.inc:
Adjusted test case to the fact that now DROP TABLE closes
open HANDLERs for the table to be dropped before checking
if there active FTWRL in this connection.
mysql-test/include/wait_show_condition.inc:
Fixed small error in the timeout message. The correct name
of variable used as parameter for this script is "$condition"
and not "$wait_condition".
mysql-test/r/delayed.result:
Added test coverage for scenario which triggered assert in
metadata locking subsystem.
mysql-test/r/events_2.result:
Updated test results after prohibiting event DDL operations
under LOCK TABLES.
mysql-test/r/flush.result:
Added test coverage for bug #57006 "Deadlock between HANDLER
and FLUSH TABLES WITH READ LOCK".
mysql-test/r/flush_read_lock.result:
Added test coverage for various aspects of FLUSH TABLES WITH
READ LOCK functionality.
mysql-test/r/flush_read_lock_kill.result:
Adjusted test case after replacing custom global read lock
implementation with one based on metadata locks. Use new
debug_sync point. Do not disable concurrent inserts as now
InnoDB we always use InnoDB table.
mysql-test/r/handler_innodb.result:
Adjusted test case to the fact that now DROP TABLE closes
open HANDLERs for the table to be dropped before checking
if there active FTWRL in this connection.
mysql-test/r/handler_myisam.result:
Adjusted test case to the fact that now DROP TABLE closes
open HANDLERs for the table to be dropped before checking
if there active FTWRL in this connection.
mysql-test/r/mdl_sync.result:
Adjusted test case after replacing custom global read lock
implementation with one based on metadata locks. Replaced
usage of GRL-specific debug_sync's with appropriate sync
points in MDL subsystem.
mysql-test/suite/perfschema/r/dml_setup_instruments.result:
Updated test results after removing global
COND_global_read_lock condition variable.
mysql-test/suite/perfschema/r/func_file_io.result:
Ensure that this test doesn't affect subsequent tests.
At the end of its execution enable back P_S instrumentation
which this test disables at some point.
mysql-test/suite/perfschema/r/func_mutex.result:
Ensure that this test doesn't affect subsequent tests.
At the end of its execution enable back P_S instrumentation
which this test disables at some point.
mysql-test/suite/perfschema/r/global_read_lock.result:
Adjusted test case to take into account that new GRL
implementation is based on MDL.
mysql-test/suite/perfschema/r/server_init.result:
Adjusted test case after replacing custom global read
lock implementation with one based on MDL and replacing
LOCK_event_metadata mutex with metadata lock.
mysql-test/suite/perfschema/t/func_file_io.test:
Ensure that this test doesn't affect subsequent tests.
At the end of its execution enable back P_S instrumentation
which this test disables at some point.
mysql-test/suite/perfschema/t/func_mutex.test:
Ensure that this test doesn't affect subsequent tests.
At the end of its execution enable back P_S instrumentation
which this test disables at some point.
mysql-test/suite/perfschema/t/global_read_lock.test:
Adjusted test case to take into account that new GRL
implementation is based on MDL.
mysql-test/suite/perfschema/t/server_init.test:
Adjusted test case after replacing custom global read
lock implementation with one based on MDL and replacing
LOCK_event_metadata mutex with metadata lock.
mysql-test/suite/rpl/r/rpl_tmp_table_and_DDL.result:
Updated test results after prohibiting event DDL under
LOCK TABLES.
mysql-test/t/delayed.test:
Added test coverage for scenario which triggered assert in
metadata locking subsystem.
mysql-test/t/events_2.test:
Updated test case after prohibiting event DDL operations
under LOCK TABLES.
mysql-test/t/flush.test:
Added test coverage for bug #57006 "Deadlock between HANDLER
and FLUSH TABLES WITH READ LOCK".
mysql-test/t/flush_block_commit.test:
Adjusted test case after changing thread state name which
is used when COMMIT waits for FLUSH TABLES WITH READ LOCK
from "Waiting for release of readlock" to "Waiting for commit
lock".
mysql-test/t/flush_block_commit_notembedded.test:
Adjusted test case after changing thread state name which is
used when DML waits for FLUSH TABLES WITH READ LOCK. Now we
use "Waiting for global read lock" in this case.
mysql-test/t/flush_read_lock.test:
Added test coverage for various aspects of FLUSH TABLES WITH
READ LOCK functionality.
mysql-test/t/flush_read_lock_kill-master.opt:
We no longer need to use make_global_read_lock_block_commit_loop
debug tag in this test. Instead we rely on an appropriate
debug_sync point in MDL code.
mysql-test/t/flush_read_lock_kill.test:
Adjusted test case after replacing custom global read lock
implementation with one based on metadata locks. Use new
debug_sync point. Do not disable concurrent inserts as now
InnoDB we always use InnoDB table.
mysql-test/t/lock_multi.test:
Adjusted test case after changing thread state names which
are used when DML or DDL waits for FLUSH TABLES WITH READ
LOCK to "Waiting for global read lock".
mysql-test/t/mdl_sync.test:
Adjusted test case after replacing custom global read lock
implementation with one based on metadata locks. Replaced
usage of GRL-specific debug_sync's with appropriate sync
points in MDL subsystem. Updated thread state names which
are used when DDL waits for FTWRL.
mysql-test/t/trigger_notembedded.test:
Adjusted test case after changing thread state names which
are used when DML or DDL waits for FLUSH TABLES WITH READ
LOCK to "Waiting for global read lock".
sql/event_data_objects.cc:
Removed Event_queue_element::status/last_executed_changed
members and Event_queue_element::update_timing_fields()
method. We no longer use this class for updating mysql.events
once event is chosen for execution. Accesses to instances of
this class in scheduler thread require protection by
Event_queue::LOCK_event_queue mutex and we try to avoid
updating table while holding this lock.
sql/event_data_objects.h:
Removed Event_queue_element::status/last_executed_changed
members and Event_queue_element::update_timing_fields()
method. We no longer use this class for updating mysql.events
once event is chosen for execution. Accesses to instances of
this class in scheduler thread require protection by
Event_queue::LOCK_event_queue mutex and we try to avoid
updating table while holding this lock.
sql/event_db_repository.cc:
- Changed Event_db_repository methods to not release all
metadata locks once they are done updating mysql.events
table. This allows to keep metadata lock protecting
against GRL and lock protecting particular event around
until corresponding DDL statement is written to the binary
log.
- Removed logic for conditional update of "status" and
"last_executed" fields from update_timing_fields_for_event()
method. In the only case when this method is called now
"last_executed" is always modified and tracking change
of "status" is too much hassle.
sql/event_db_repository.h:
Removed logic for conditional update of "status" and
"last_executed" fields from Event_db_repository::
update_timing_fields_for_event() method.
In the only case when this method is called now "last_executed"
is always modified and tracking change of "status" field is
too much hassle.
sql/event_queue.cc:
Changed event scheduler code not to update mysql.events
table while holding Event_queue::LOCK_event_queue mutex.
Doing so led to a deadlock with a new GRL implementation.
This deadlock didn't occur with old implementation due to
fact that code acquiring protection against GRL ignored
pending GRL requests (which lead to GRL starvation).
One of goals of new implementation is to disallow GRL
starvation and so we have to solve problem with this
deadlock in a different way.
sql/events.cc:
Changed methods of Events class to acquire protection
against GRL while perfoming DDL statement and keep it
until statement is written to the binary log.
Unfortunately this step together with new GRL implementation
exposed deadlock involving Events::LOCK_event_metadata
and GRL. To solve it Events::LOCK_event_metadata mutex was
replaced with a metadata lock on event. As a side-effect
events DDL has to be prohibited under LOCK TABLES even in
cases when mysql.events table was explicitly locked for
write.
sql/events.h:
Replaced Events::LOCK_event_metadata mutex with a metadata
lock on event.
sql/ha_ndbcluster.cc:
Updated code after replacing custom global read lock
implementation with one based on MDL. Since MDL subsystem
should now be able to detect deadlocks involving metadata
locks and GRL there is no need for special handling of
active GRL.
sql/handler.cc:
Replaced custom implementation of global read lock with
one based on metadata locks. Consequently when doing
commit instead of calling method of Global_read_lock
class to acquire protection against GRL we simply acquire
IX in COMMIT namespace.
sql/lock.cc:
Replaced custom implementation of global read lock with
one based on metadata locks. This step allows to expose
wait for GRL to deadlock detector of MDL subsystem and
thus succesfully resolve deadlocks similar to one behind
bug #57006 "Deadlock between HANDLER and FLUSH TABLES
WITH READ LOCK". It also solves problem with GRL starvation
described in bug #54673 "It takes too long to get readlock
for 'FLUSH TABLES WITH READ LOCK'" since metadata locks used
by GRL give preference to FTWRL statement instead of DML
statements (if needed in future this can be changed to
fair scheduling).
Similar to old implementation of acquisition of GRL 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.
To support this change:
- Global_read_lock::lock/unlock_global_read_lock and
make_global_read_lock_block_commit methods were changed
accordingly.
- Global_read_lock::wait_if_global_read_lock() and
start_waiting_global_read_lock() methods were dropped.
It is now responsibility of code acquiring metadata locks
opening tables to acquire protection against GRL by
explicitly taking global IX lock with statement duration.
- Global variables, mutex and condition variable used by
old implementation was removed.
- lock_routine_name() was changed to use statement duration for
its global IX lock. It was also renamed to lock_object_name()
as it now also used to take metadata locks on events.
- Global_read_lock::set_explicit_lock_duration() was added which
allows not to release locks used for GRL when leaving prelocked
mode.
sql/lock.h:
- Renamed lock_routine_name() to lock_object_name() and changed
its signature to allow its usage for events.
- Removed broadcast_refresh() function. It is no longer needed
with new GRL implementation.
sql/log_event.cc:
Release metadata locks with statement duration at the end
of processing legacy event for LOAD DATA. This ensures that
replication thread processing such event properly releases
its protection against global read lock.
sql/mdl.cc:
Changed MDL subsystem to support new MDL-based implementation
of global read lock.
Added COMMIT and EVENTS namespaces for metadata locks. Changed
thread state name for GLOBAL namespace to "Waiting for global
read lock".
Optimized MDL_map::find_or_insert() method to avoid taking
m_mutex mutex when looking up MDL_lock objects for GLOBAL
or COMMIT namespaces. We keep pre-created MDL_lock objects
for these namespaces around and simply return pointers to
these global objects when needed.
Changed MDL_lock/MDL_scoped_lock to properly handle
notification of insert delayed handler threads when FTWRL
takes global S lock.
Introduced concept of lock duration. In addition to locks with
transaction duration which work in the way which is similar to
how locks worked before (i.e. they are released at the end of
transaction), locks with statement and explicit duration were
introduced.
Locks with statement duration are automatically released at the
end of statement. Locks with explicit duration require explicit
release and obsolete concept of transactional sentinel.
* Changed MDL_request and MDL_ticket classes to support notion
of duration.
* Changed MDL_context to keep locks with different duration in
different lists. Changed code handling ticket list to take
this into account.
* Changed methods responsible for releasing locks to take into
account duration of tickets. Particularly public
MDL_context::release_lock() method now only can release
tickets with explicit duration (there is still internal
method which allows to specify duration). To release locks
with statement or transaction duration one have to use
release_statement/transactional_locks() methods.
* Concept of savepoint for MDL subsystem now has to take into
account locks with statement duration. Consequently
MDL_savepoint class was introduced and methods working with
savepoints were updated accordingly.
* Added methods which allow to set duration for one or all
locks in the context.
sql/mdl.h:
Changed MDL subsystem to support new MDL-based implementation
of global read lock.
Added COMMIT and EVENTS namespaces for metadata locks.
Introduced concept of lock duration. In addition to locks with
transaction duration which work in the way which is similar to
how locks worked before (i.e. they are released at the end of
transaction), locks with statement and explicit duration were
introduced.
Locks with statement duration are automatically released at the
end of statement. Locks with explicit duration require explicit
release and obsolete concept of transactional sentinel.
* Changed MDL_request and MDL_ticket classes to support notion
of duration.
* Changed MDL_context to keep locks with different duration in
different lists. Changed code handling ticket list to take
this into account.
* Changed methods responsible for releasing locks to take into
account duration of tickets. Particularly public
MDL_context::release_lock() method now only can release
tickets with explicit duration (there is still internal
method which allows to specify duration). To release locks
with statement or transaction duration one have to use
release_statement/transactional_locks() methods.
* Concept of savepoint for MDL subsystem now has to take into
account locks with statement duration. Consequently
MDL_savepoint class was introduced and methods working with
savepoints were updated accordingly.
* Added methods which allow to set duration for one or all
locks in the context.
sql/mysqld.cc:
Removed global mutex and condition variables which were used
by old implementation of GRL.
Also we no longer need to initialize Events::LOCK_event_metadata
mutex as it was replaced with metadata locks on events.
sql/mysqld.h:
Removed global variable, mutex and condition variables which
were used by old implementation of GRL.
sql/rpl_rli.cc:
When slave thread closes tables which were open for handling
of RBR events ensure that it releases global IX lock which
was acquired as protection against GRL.
sql/sp.cc:
Adjusted code to the new signature of lock_object/routine_name(),
to the fact that one now needs specify duration of lock when
initializing MDL_request and to the fact that savepoints for MDL
subsystem are now represented by MDL_savepoint class.
sql/sp_head.cc:
Ensure that statements in stored procedures release statement
metadata locks and thus release their protectiong against GRL
in proper moment in time.
Adjusted code to the fact that one now needs specify duration
of lock when initializing MDL_request.
sql/sql_admin.cc:
Adjusted code to the fact that one now needs specify duration
of lock when initializing MDL_request.
sql/sql_base.cc:
- Implemented support for new approach to acquiring protection
against global read lock. We no longer acquire such protection
explicitly on the basis of statement flags. Instead we always
rely on code which is responsible for acquiring metadata locks
on object to be changed acquiring this protection. This is
achieved by acquiring global IX metadata lock with statement
duration. Code doing this also responsible for checking that
current connection has no active GRL by calling an
Global_read_lock::can_acquire_protection() method.
Changed code in open_table() and lock_table_names()
accordingly.
Note that as result of this change DDL and DML on temporary
tables is always compatible with GRL (before it was
incompatible in some cases and compatible in other cases).
- To speed-up code acquiring protection against GRL introduced
m_has_protection_against_grl member in Open_table_context
class. It indicates that protection was already acquired
sometime during open_tables() execution and new attempts
can be skipped.
- Thanks to new GRL implementation calls to broadcast_refresh()
became unnecessary and were removed.
- Adjusted code to the fact that one now needs specify duration
of lock when initializing MDL_request and to the fact that
savepoints for MDL subsystem are now represented by
MDL_savepoint class.
sql/sql_base.h:
Adjusted code to the fact that savepoints for MDL subsystem are
now represented by MDL_savepoint class.
Also introduced Open_table_context::m_has_protection_against_grl
member which allows to avoid acquiring protection against GRL
while opening tables if such protection was already acquired.
sql/sql_class.cc:
Changed THD::leave_locked_tables_mode() after transactional
sentinel for metadata locks was obsoleted by introduction of
locks with explicit duration.
sql/sql_class.h:
- Adjusted code to the fact that savepoints for MDL subsystem
are now represented by MDL_savepoint class.
- Changed Global_read_lock class according to changes in
global read lock implementation:
* wait_if_global_read_lock and start_waiting_global_read_lock
are now gone. Instead code needing protection against GRL
has to acquire global IX metadata lock with statement
duration itself. To help it new can_acquire_protection()
was introduced. Also as result of the above change
m_protection_count member is gone too.
* Added m_mdl_blocks_commits_lock member to store metadata
lock blocking commits.
* Adjusted code to the fact that concept of transactional
sentinel was obsoleted by concept of lock duration.
- Removed CF_PROTECT_AGAINST_GRL flag as it is no longer
necessary. New GRL implementation acquires protection
against global read lock automagically when statement
acquires metadata locks on tables or other objects it
is going to change.
sql/sql_db.cc:
Adjusted code to the fact that one now needs specify duration
of lock when initializing MDL_request.
sql/sql_handler.cc:
Removed call to broadcast_refresh() function. It is no longer
needed with new GRL implementation.
Adjusted code after introducing duration concept for metadata
locks. Particularly to the fact transactional sentinel was
replaced with explicit duration.
sql/sql_handler.h:
Renamed mysql_ha_move_tickets_after_trans_sentinel() to
mysql_ha_set_explicit_lock_duration() after transactional
sentinel was obsoleted by locks with explicit duration.
sql/sql_insert.cc:
Adjusted code handling delaying inserts after switching to
new GRL implementation. Now connection thread initiating
delayed insert has to acquire global IX lock in addition
to metadata lock on table being inserted into. This IX lock
protects against GRL and similarly to SW lock on table being
inserted into has to be passed to handler thread in order to
avoid deadlocks.
sql/sql_lex.cc:
LEX::protect_against_global_read_lock member is no longer
necessary since protection against GRL is automatically
taken by code acquiring metadata locks/opening tables.
sql/sql_lex.h:
LEX::protect_against_global_read_lock member is no longer
necessary since protection against GRL is automatically
taken by code acquiring metadata locks/opening tables.
sql/sql_parse.cc:
- Implemented support for new approach to acquiring protection
against global read lock. We no longer acquire such protection
explicitly on the basis of statement flags. Instead we always
rely on code which is responsible for acquiring metadata locks
on object to be changed acquiring this protection. This is
achieved by acquiring global IX metadata lock with statement
duration. This lock is automatically released at the end of
statement execution.
- Changed implementation of CREATE/DROP PROCEDURE/FUNCTION not
to release metadata locks and thus protection against of GRL
in the middle of statement execution.
- Adjusted code to the fact that one now needs specify duration
of lock when initializing MDL_request and to the fact that
savepoints for MDL subsystem are now represented by
MDL_savepoint class.
sql/sql_prepare.cc:
Adjusted code to the to the fact that savepoints for MDL
subsystem are now represented by MDL_savepoint class.
sql/sql_rename.cc:
With new GRL implementation there is no need to explicitly
acquire protection against GRL before renaming tables.
This happens automatically in code which acquires metadata
locks on tables being renamed.
sql/sql_show.cc:
Adjusted code to the fact that one now needs specify duration
of lock when initializing MDL_request and to the fact that
savepoints for MDL subsystem are now represented by
MDL_savepoint class.
sql/sql_table.cc:
- With new GRL implementation there is no need to explicitly
acquire protection against GRL before dropping tables.
This happens automatically in code which acquires metadata
locks on tables being dropped.
- Changed mysql_alter_table() not to release lock on new table
name explicitly and to rely on automatic release of locks
at the end of statement instead. This was necessary since
now MDL_context::release_lock() is supported only for locks
for explicit duration.
sql/sql_trigger.cc:
With new GRL implementation there is no need to explicitly
acquire protection against GRL before changing table triggers.
This happens automatically in code which acquires metadata
locks on tables which triggers are to be changed.
sql/sql_update.cc:
Fix bug exposed by GRL testing. During prepare phase acquire
only S metadata locks instead of SW locks to keep prepare of
multi-UPDATE compatible with concurrent LOCK TABLES WRITE
and global read lock.
sql/sql_view.cc:
With new GRL implementation there is no need to explicitly
acquire protection against GRL before creating view.
This happens automatically in code which acquires metadata
lock on view to be created.
sql/sql_yacc.yy:
LEX::protect_against_global_read_lock member is no longer
necessary since protection against GRL is automatically
taken by code acquiring metadata locks/opening tables.
sql/table.cc:
Adjusted code to the fact that one now needs specify duration
of lock when initializing MDL_request.
sql/table.h:
Adjusted code to the fact that one now needs specify duration
of lock when initializing MDL_request.
sql/transaction.cc:
Replaced custom implementation of global read lock with
one based on metadata locks. Consequently when doing
commit instead of calling method of Global_read_lock
class to acquire protection against GRL we simply acquire
IX in COMMIT namespace.
Also adjusted code to the fact that MDL savepoint is now
represented by MDL_savepoint class.
with on duplicate key update
There was a missed corner case in the partitioning
handler, which caused the next_insert_id to be changed
in the second level handlers (i.e the hander of a partition),
which caused this debug assertion.
The solution was to always ensure that only the partitioning
level generates auto_increment values, since if it was done
within a partition, it may fail to match the partition
function.
mysql-test/suite/parts/inc/partition_auto_increment.inc:
Added tests
mysql-test/suite/parts/r/partition_auto_increment_blackhole.result:
updated results
mysql-test/suite/parts/r/partition_auto_increment_innodb.result:
updated results
mysql-test/suite/parts/r/partition_auto_increment_memory.result:
updated results
mysql-test/suite/parts/r/partition_auto_increment_myisam.result:
updated results
sql/ha_partition.cc:
In <engine>::write_row the auto_inc value is generated
through handler::update_auto_increment (which calls <engine>::get_auto_increment() if needed).
If:
* INSERT_ID was set to 0
* it was updated to 0 by 'INSERT ... ON DUPLICATE KEY UPDATE' and changed partitions for the row
Then it would try to generate a auto_increment value in the
<engine for a specific partition>::write_row, which will
trigger the assert.
So the solution is to prevent this by,
in ha_partition::write_row set auto_inc_field_not_null and
add MODE_NO_AUTO_VALUE_ON_ZERO
in ha_partition::update_row (when changing partition) temporary
set table->next_number_field to NULL which calling the
partitions ::write_row().
in different default schema.
In strict mode, when data truncation or conversion happens,
THD::killed is set to THD::KILL_BAD_DATA.
This is abuse of KILL mechanism to guarantee that execution
of statement is aborted.
The stored procedures execution, on the other hand,
upon detection that a connection was killed, would
terminate immediately, without trying to restore the caller's
context, in particular, restore the caller's current schema.
The fix is, when terminating a stored procedure execution,
to only bypass cleanup if the entire connection was killed,
not in case of other forms of KILL.
mysql-test/r/sp-bugs.result:
Added result for a test case for bug#54375.
mysql-test/t/sp-bugs.test:
Added test case for bug#54375.
sql/sp_head.cc:
sp_head::execute modified: restore saved current db if
connection is not killed.
Bug#57995: Compiler flag change build error on OSX 10.4: my_getncpus.c
Bug#57996: Compiler flag change build error on OSX 10.5 : bind.c
Bug#57994: Compiler flag change build error : my_redel.c
Bug#57993: Compiler flag change build error on FreeBsd 7.0 : regexec.c
Bug#57992: Compiler flag change build error on FreeBsd : mf_keycache.c
Bug#57997: Compiler flag change build error on OSX 10.6: debug_sync.cc
Fix assorted compiler generated warnings.
cmd-line-utils/readline/bind.c:
Bug#57996: Compiler flag change build error on OSX 10.5 : bind.c
Initialize variable to work around a false positive warning.
include/m_string.h:
Bug#57994: Compiler flag change build error : my_redel.c
The expansion of stpcpy (in glibc) causes warnings if the
return value of strmov is not being used. Since stpcpy is
a GNU extension and the expansion ends up using a built-in
provided by GCC, use the compiler provided built-in directly
when possible.
include/my_compiler.h:
Define a dummy MY_GNUC_PREREQ when not compiling with GCC.
libmysql/libmysql.c:
Bug#58057: 5.1 libmysql/libmysql.c unused variable/compile failure
Variable might not be used in some cases. So, tag it as unused.
mysys/mf_keycache.c:
Bug#57992: Compiler flag change build error on FreeBsd : mf_keycache.c
Use UNINIT_VAR to work around a false positive warning.
mysys/my_getncpus.c:
Bug#57995: Compiler flag change build error on OSX 10.4: my_getncpus.c
Declare variable in the same block where it is used.
regex/regexec.c:
Bug#57993: Compiler flag change build error on FreeBsd 7.0 : regexec.c
Work around a compiler bug which causes the cast to not be enforced.
sql/debug_sync.cc:
Bug#57997: Compiler flag change build error on OSX 10.6: debug_sync.cc
Use UNINIT_VAR to work around a false positive warning.
sql/handler.cc:
Use UNINIT_VAR to work around a false positive warning.
sql/slave.cc:
Use UNINIT_VAR to work around a false positive warning.
sql/sql_partition.cc:
Use UNINIT_VAR to work around a false positive warning.
storage/myisam/ft_nlq_search.c:
Use UNINIT_VAR to work around a false positive warning.
storage/myisam/mi_create.c:
Use UNINIT_VAR to work around a false positive warning.
storage/myisammrg/myrg_open.c:
Use UNINIT_VAR to work around a false positive warning.
tests/mysql_client_test.c:
Change function to take a pointer to const, no need for a cast.
This bug was introduced in this revision:
kostja@sun.com-20100727102553-b4n2ojcyfj79l2x7
("A pre-requisite patch for the fix for Bug#52044.")
It happens because close_thread_tables() is now called in
open_and_lock_tables upon failure. Hence, table is no longer
open when optimizer tries to do cleanup.
Fix: Make sure to do cleanup in st_select_lex_unit::prepare()
upon failure. This way, cleanup() is called before tables are
released.
mysql-test/r/subselect.result:
Added test case for Bug#57704.
mysql-test/t/subselect.test:
Added test case for Bug#57704.
sql/sql_union.cc:
st_select_lex_unit::prepare(): On failure, make sure cleanup()
is called.
ALTER TABLE RENAME, DISABLE KEYS.
The code of ALTER TABLE RENAME, DISABLE KEYS could
issue a commit while holding LOCK_open mutex.
This is a regression introduced by the fix for
Bug 54453.
This failed an assert guarding us against a potential
deadlock with connections trying to execute
FLUSH TABLES WITH READ LOCK.
The fix is to move acquisition of LOCK_open outside
the section that issues ha_autocommit_or_rollback().
LOCK_open is taken to protect against concurrent
operations with .frms and the table definition
cache, and doesn't need to cover the call to commit.
A test case added to innodb_mysql.test.
The patch is to be null-merged to 5.5, which
already has 54453 null-merged to it.
mysql-test/suite/innodb/r/innodb_mysql.result:
Added test results for test for bug#56619.
mysql-test/suite/innodb/t/innodb_mysql.test:
Added test for bug#56619.
sql/sql_table.cc:
mysql_alter_table() modified: moved acquisition of LOCK_open
after call to ha_autocommit_or_rollback.
The problem was that the scheduler function used to handle a
new user connection could use the ER() macro without having a
THD object bound to the current thread. The crash would happen
whenever the function failed to create a new thread to handle a
user connection. Thread creation can fail due to lack or limit
of available resources.
The solution is to simply use the ER_THD() macro instead and pass
to it the THD object which would be bound to the connection.
Fix was tested manually. In a test case, it is too cumbersome to
inject a error in this context.
sql/mysqld.cc:
Use ER_THD and pass the object.
Quoting from the bug report:
The pstack library has been included in MySQL since version
4.0.0. It's useless and should be removed.
Details: According to its own documentation, pstack only works
on Linux on x86 in 32 bit mode and requires LinuxThreads and a
statically linked binary. It doesn't really support any Linux
from 2003 or later and doesn't work on any other OS.
The --enable-pstack option is thus deprecated and has no effect.
sporadically.
The cause of the sporadic time out was a leaking protection
against the global read lock, taken by the RENAME statement,
and not released in case of an error occurred during RENAME.
The leaking protection counter would lead to the value of
protect_against_global_read never dropping to 0.
Consequently FLUSH TABLES in all connections, including the
one that leaked the protection, could not proceed.
The fix is to ensure that all branchesin RENAME code properly
release GRL protection.
mysql-test/r/log_tables.result:
Added results for test for bug#47924.
mysql-test/t/log_tables.test:
Added test for bug#47924.
sql/sql_rename.cc:
mysql_rename_tables() modified: replaced return from function
to goto to clean up code block in case of error.
add boolean command-line option --autocommit.
mysql-test/mysql-test-run.pl:
do in --gdb like in --ddd: to let the developer debug the startup
phase (like command-line options parsing), don't "run".
It's the third time I do this change, it was previously lost
by merges, port of 6.0 to next-mr...
mysql-test/r/mysqld--help-notwin.result:
new command-line option
mysql-test/r/mysqld--help-win.result:
a Linux user's best guess at what the Windows result should be
mysql-test/suite/sys_vars/inc/autocommit_func2.inc:
new test
mysql-test/suite/sys_vars/t/autocommit_func2-master.opt:
test new option
mysql-test/suite/sys_vars/t/autocommit_func3-master.opt:
test new option
sql/mysqld.cc:
new --autocommit
sql/mysqld.h:
new --autocommit
sql/sql_partition.cc:
What matters to this partitioning quote is to have
the OPTION_QUOTE_SHOW_CREATE flag down, it's all
that append_identifier() uses. So we make it explicit.
It was possible to issue an ALTER TABLE ADD PRIMARY KEY on
an partitioned InnoDB table that failed and crashed the server.
The problem was that it succeeded to create the PK on at least
one partition, and then failed on a subsequent partition, due to
duplicate key violation. Since the partitions that already had added
the PK was not reverted all partitions was not consistent with the
table definition, which caused the crash.
The solution was to add a revert step to ha_partition::add_index()
that dropped the index for the already succeeded partitions, on failure.
mysql-test/r/partition.result:
updated result
mysql-test/t/partition.test:
Added test
sql/ha_partition.cc:
Only allow ADD/DROP flags in pairs, so that they can be reverted on failures.
If add_index() fails for a partition, revert (drop the index) for the previous
partitions.
sql/handler.h:
Added some extra info in a comment.
If a relative path is supplied to option --defaults-file or
--defaults-extra-file, the server will crash when executing
an INSTALL PLUGIN command. The reason is that the defaults
file is initially read relative the current working directory
when the server is started, but when INSTALL PLUGIN is executed,
the server has changed working directory to the data directory.
Since there is no check that the call to my_load_defaults()
inside mysql_install_plugin(), the subsequence call to
free_defaults() will crash the server.
This patch fixes the problem by:
- Prepending the current working directory to the file name when
a relative path is given to the --defaults-file or --defaults-
extra-file option the first time my_load_defaults() is called,
which is just after the server has started in main().
- Adding a check of the return value of my_load_defaults() inside
mysql_install_plugin() and aborting command (with an error) if
an error is returned.
- It also adds a check of the return value for load_defaults in
lib_sql.cc for the embedded server since that was missing.
To test that the relative files for the options --defaults-file and
--defaults-extra-file is handled properly, mysql-test-run.pl is also
changed to not add a --defaults-file option if one is provided in the
tests *.opt file.
Assertion `fixed == 1' failed
(also fixes duplicate bug 57515)
agg_item_set_converter() (item.cc) handles conversion of
character sets by creating a new Item. fix_fields() is then
called on this newly created item. Prior to this patch, it was
not checked whether fix_fields() was successful or not. Thus,
agg_item_set_converter() would return success even when an
error occured. This patch makes it return error (TRUE) if
fix_fields() fails.
mysql-test/r/errors.result:
Add test for BUG#57882
mysql-test/t/errors.test:
Add test for BUG#57882
sql/item.cc:
Make agg_item_set_converter() return with error if fix_fields()
on the newly created converted item fails.
Function delegetas_init() did not report proper error messages
when there are failures, which made it hard to know where the problem
occurred.
Fixed the problem by adding specific error message for every possible
place that can fail. And since these failures are supposed to never
happen, ask the user to report a bug if they happened.
In MySQL 5.5 the new reserved words include:
SLOW as in FLUSH SLOW LOGS
GENERAL as in FLUSH GENERAL LOGS
IGNORE_SERVER_IDS as in CHANGE MASTER ... IGNORE_SERVER_IDS
MASTER_HEARTBEAT_PERIOD as in CHANGE MASTER ... MASTER_HEARTBEAT_PERIOD
These are not reserved words in standard SQL, or in Oracle 11g,
and as such, may affect existing applications.
We fix this by adding the new words to the list of
keywords that are allowed for labels in SPs.
mysql-test/t/keywords.test:
Test case that checks that the target words can be used
for naming fields in a table or as local routine variable
names.
1. Fixed the name of the table to proxies_priv
2. Fixed the column names to be of the form Capitalized_lowecarse instead of
Capitalized_Capitalized
3. Added Timestamp and Grantor columns
4. Added tests to plugin_auth to check the table structure
5. Updated the existing tests
by a function and column
The bugreport reveals two different bugs about grouping
on a function:
1) grouping by the TIME_TO_SEC function result caused
a server crash or wrong results and
2) grouping by the function returning a blob caused
an unexpected "Duplicate entry" error and wrong
result.
Details for the 1st bug:
TIME_TO_SEC() returns NULL if its argument is invalid (empty
string for example). Thus its nullability depends not only
on the nullability of its arguments but also on their values.
Fixed by (overoptimistically) setting TIME_TO_SEC() to be
nullable despite the nullability of its arguments.
Details for the 2nd bug:
The server is unable to create indices on blobs without
explicit blob key part length. However, this fact was
ignored for blob function result fields of GROUP BY
intermediate tables.
Fixed by disabling GROUP BY index creation for blob
function result fields like regular blob fields.
mysql-test/r/func_time.result:
Test case for bug #52160.
mysql-test/r/type_blob.result:
Test case for bug #52160.
mysql-test/t/func_time.test:
Test case for bug #52160.
mysql-test/t/type_blob.test:
Test case for bug #52160.
sql/item_timefunc.h:
Bug #52160: crash and inconsistent results when grouping
by a function and column
TIME_TO_SEC() returns NULL if its argument is invalid (empty
string for example). Thus its nullability depends not only
Fixed by (overoptimistically) setting TIME_TO_SEC() to be
nullable despite the nullability of its arguments.
sql/sql_select.cc:
Bug #52160: crash and inconsistent results when grouping
by a function and column
The server is unable to create indices on blobs without
explicit blob key part length. However, this fact was
ignored for blob function result fields of GROUP BY
intermediate tables.
Fixed by disabling GROUP BY index creation for blob
function result fields like regular blob fields.
