Other things:
- Cleanup of allocated bitmaps done in open(), which
simplifies init_partition_bitmaps()
- Add needed defines in ha_spider.cc to enable new spider code
- Fixed some DBUG_PRINT() to be consistent with normal code
- Removed end space
- The changes in test cases partition_innodb, partition_range,
partition_pruning etc are becasue partitions can now more exactly
calculate the number of rows in a range.
Contains spider patches:
014,015,023,033,035,037,040,042,044,045,049,050,051,053,059
MDL_CONTEXT::TRY_ACQUIRE_LOCK_IMPL
ANALYSIS:
=========
Server sometimes exited when multiple threads tried to
acquire and release metadata locks simultaneously (for
example, necessary to access a table). The same problem
could have occurred when new objects were registered/
deregistered in Performance Schema.
The problem was caused by a bug in LF_HASH - our lock free
hash implementation which is used by metadata locking
subsystem in 5.7 branch. In 5.5 and 5.6 we only use LF_HASH
in Performance Schema Instrumentation implementation. So
for these versions, the problem was limited to P_S.
The problem was in my_lfind() function, which searches for
the specific hash element by going through the elements
list. During this search it loads information about element
checked such as key pointer and hash value into local
variables. Then it confirms that they are not corrupted by
concurrent delete operation (which will set pointer to 0)
by checking if element is still in the list. The latter
check did not take into account that compiler (and
processor) can reorder reads in such a way that load of key
pointer will happen after it, making result of the check
invalid.
FIX:
====
This patch fixes the problem by ensuring that no such
reordering can take place. This is achieved by using
my_atomic_loadptr() which contains compiler and processor
memory barriers for the check mentioned above and other
similar places.
The default (for non-Windows systems) implementation of
my_atomic*() relies on old __sync intrisics and implements
my_atomic_loadptr() as read-modify operation. To avoid
scalability/performance penalty associated with addition of
my_atomic_loadptr()'s we change the my_atomic*() to use
newer __atomic intrisics when available. This new default
implementation doesn't have such a drawback.
The background is that one user had a lot of views and using some complex
queries on information schema temporary memory of more than 2G was used.
- Added new element 'total_alloc' to MEM_ROOT for easier debugging.
- Added MAX_MEMORY_USED to information_schema.processlist.
- Added new status variable "Memory_used_initial" that shows how much MariaDB
uses at startup. This gives the base value for "Memory_used".
- Reuse memory continuously for information schema queries instead of
only freeing memory at query end.
Other things
- Removed some not needed set_notnull() calls for not null columns.
finish_resize_simple_key_cache removed argument acquire for acquiring
locks.
resize_simple_key_cache enforces assertion that the cache is inited.
read_block was really two functions, primary and secondary so separated
as such. Make the callers of read_block explictly use the required function.
Signed-off-by: Daniel Black <daniel@linux.vnet.ibm.com>
- Fix win64 pointer truncation warnings
(usually coming from misusing 0x%lx and long cast in DBUG)
- Also fix printf-format warnings
Make the above mentioned warnings fatal.
- fix pthread_join on Windows to set return value.
Reintroduce environment variable MYSQL_GROUP_SUFFIX to be used as
--default-group-suffix value if not already set.
The environment variable was accidentally renamed to DEFAULT_GROUP_SUFFIX_ENV
in MySQL server 5.5.
ERROR_FILE_SYSTEM_LIMITATION was seen by support when backing up large
file. However mariabackup error message was not very helpful,
since it mapped the error to generic catch-all EINVAL.
With the patch, ERROR_FILE_SYSTEM_LIMITATION will be mapped to more
appropriate EFBIG. Also add mapping from ERROR_NO_SYSTEM_RESOURCES
to ENOMEM.
This fixes MDEV-7742 and MDEV-8305 (Allow user to specify if stored
procedures should be logged in the slow and general log)
New functionality:
- Added new variables log_slow_disable_statements and log_disable_statements
that can be used to disable logging of certain queries to slow and
general log. Currently supported options are 'admin', 'call', 'slave'
and 'sp'.
Defaults are as before. Only 'sp' (stored procedure statements) is
disabled for slow and general_log.
- Slow log to files now includes the following new information:
- When logging stored procedure statements the name of stored
procedure is logged.
- Number of created tmp_tables, tmp_disk_tables and the space used
by temporary tables.
- When logging 'call', the logged status now contains the sum of all
included statements. Before only 'time' was correct.
- Added filsort_priority_queue as an option for log_slow_filter (this
variable existed before, but was not exposed)
- Added support for BIT types in my_getopt()
Mapped some old variables to bitmaps (old variables can still be used)
- Variable 'log_queries_not_using_indexes' is mapped to
log_slow_filter='not_using_index'
- Variable 'log_slow_slave_statements' is mapped to
log_slow_disabled_statements='slave'
- Variable 'log_slow_admin_statements' is mapped to
log_slow_disabled_statements='admin'
- All the above variables are changed to session variables from global
variables
Other things:
- Simplified LOGGER::log_command. We don't need to check for super if
OPTION_LOG_OFF is set as this flag can only be set if one is a super
user.
- Removed some setting of enable_slow_log as it's guaranteed to be set by
mysql_parse()
- mysql_admin_table() now sets thd->enable_slow_log
- Added prepare_logs_for_admin_command() to reset thd->enable_slow_log if
needed.
- Added new functions to store, restore and add slow query status
- Added new functions to store and restore query start time
- Reorganized Sub_statement_state according to types
- Added code in dispatch_command() to ensure that
thd->reset_for_next_command() is always called for a query.
- Added thd->last_sql_command to simplify checking of what was the type
of the last command. Needed when logging to slow log as lex->sql_command
may have changed before slow logging is called.
- Moved QPLAN_TMP_... to where status for tmp tables are updated
- Added new THD variable, affected_rows, to be able to correctly log
number of affected rows to slow log.
If compiling a non DBUG binary with
-DDBUG_ASSERT_AS_PRINTF asserts will be
changed to printf + stack trace (of stack
trace are enabled).
- Changed #ifndef DBUG_OFF to
#ifdef DBUG_ASSERT_EXISTS
for those DBUG_OFF that was just used to enable
assert
- Assert checking that could greatly impact
performance where changed to DBUG_ASSERT_SLOW which
is not affected by DBUG_ASSERT_AS_PRINTF
- Added one extra option to my_print_stacktrace() to
get more silent in case of stack trace printing as
part of assert.
- Simplified use_trans_cache() to return at once if is_transactional is set
- Indentation and spelling errors fixed
- Don't call signal_update() if update_binlog_end_pos() is called as the
function already calls signal_update()
- Removed not used function wait_for_update_bin_log(), which would cause
errors if ever used.
- Simplified handler::clone() by always allocating 'ref' in ha_open(). To do
this I added an optional MEM_ROOT argument to ha_open() to be used when
allocating 'ref'
- Changed arguments to get_system_var() from LEX_CSTRING to LEX_CSTRING*
- Added THD as argument to create_select_for_variable(). Changed also char*
argument to LEX_CSTRING to avoid strlen() call.
- Change calls to append() to use LEX_CSTRING
- Added sql/mariadb.h file that should be included first by files in sql
directory, if sql_plugin.h is not used (sql_plugin.h adds SHOW variables
that must be done before my_global.h is included)
- Removed a lot of include my_global.h from include files
- Removed include's of some files that my_global.h automatically includes
- Removed duplicated include's of my_sys.h
- Replaced include my_config.h with my_global.h
A few tests assumes that the CYCLE timer is always available,
which is not true on some platforms (e.g. ARM).
Fixing the tests not to reply on the CYCLE availability.
