It helps to interpret valgrind/safemalloc memory-related warnings that are
printed when a plugin is unloaded (and thus cannot resolve addresses automatically)
Pre-MDL versions had direct relationship between LOCK_open and
LOCK_global_system_variables, e.g.:
intern_sys_var_ptr // locks LOCK_global_system_variable
mysql_sys_var_char
create_options_are_valid
ha_innobase::create
handler::ha_create
ha_create_table
rea_create_table
mysql_create_table_no_lock // locks LOCK_open
mysql_create_table
With MDL this relationship was removed, but mutex order was still
recorded. In fact there is indirect relationship between LOCK_open
and LOCK_global_system_variables via rwlocks in reverse order.
Removed LOCK_open and LOCK_global_system_variables order recording,
instead assert that LOCK_open is never held in intern_sys_var_ptr().
This solves only one of many problems detected with MDEV-5089.
INSTALL PLUGIN
There was mixed lock order between LOCK_plugin, LOCK_global_system_variables
and LOCK_system_variables_hash. This patch ensures that write-lock on
LOCK_system_variables_hash doesn't intersect with LOCK_plugin.
Fixed by moving initialization/deinitialization of plugin options from
plugin_add()/plugin_del() to plugin_initialize()/plugin_deinitalize().
So that plugin options are handled without protection of LOCK_plugin.
When a DSO is loaded we rewrite service pointers to point to the actual service structures.
But when a DSO is unloaded, we have to restore their original values, in case this DSO
wasn't removed from memory on dlclose() and is later loaded again.
* add TokuDB, together with the ft-index library
* cmake support, auto-detecting whether tokudb can be built
* fix packaging - tokudb-engine.rpm, deb
* remove PBXT
* add jemalloc
* the server is built with jemalloc by default even if TokuDB is not built
* documentation files in RPM are installed in the correct location
* support for optional deb packages (tokudb has specific build requirements)
* move plugins from mariadb-server deb to appropriate debs (server/test/libmariadbclient)
* correct mariadb-test.deb to be not architecture-independent
* fix out-of-tree builds to never modify in-tree files
* new handler::prepare_index_scan() method
file_logger became the service.
Data like query_id now are sent to the audit plugin.
Fix for MDEV-4770 ported from 10.0.
Fix added for the read_maria_plugin_info().
Log rotation can be disabled with 'set rotations=0'.
innodb_ft_user_stopword_table to DEFAULT
Setting plugin string variable with PLUGIN_VAR_MEMALLOC flag
to NULL causes server crash.
mysql-test/suite/sys_vars/r/innodb_ft_user_stopword_table_basic.result:
Reset innodb_ft_user_stopword_table. Also tests MDEV-4801.
mysql-test/suite/sys_vars/t/innodb_ft_user_stopword_table_basic.test:
Reset innodb_ft_user_stopword_table. Also tests MDEV-4801.
sql/sql_plugin.cc:
When we got NULL value, do not strdup(NULL).
includes:
* remove some remnants of "Bug#14521864: MYSQL 5.1 TO 5.5 BUGS PARTITIONING"
* introduce LOCK_share, now LOCK_ha_data is strictly for engines
* rea_create_table() always creates .par file (even in "frm-only" mode)
* fix a 5.6 bug, temp file leak on dummy ALTER TABLE
(it worked fine with the modern gcc, but failed on some other compilers).
modified:
include/my_global.h
include/mysql/plugin.h
include/mysql/plugin_audit.h.pp
include/mysql/plugin_auth.h.pp
include/mysql/plugin_ftparser.h.pp
include/mysql/service_thd_timezone.h
sql/item_func.cc
sql/mysqld.cc
sql/set_var.cc
sql/sql_plugin.cc
sql/sql_plugin.h
sql/sql_show.cc
sql/sys_vars.cc
storage/perfschema/ha_perfschema.cc
USING THE PLUGIN INTERFACE.
ISSUE: No support for floating-point plugin
system variables.
SOLUTION: Allowing plugins to define and expose floating-point
system variables of type double. MYSQL_SYSVAR_DOUBLE
and MYSQL_THDVAR_DOUBLE are added.
ISSUE: Fractional part of the def, min, max values of system
variables are ignored.
SOLUTION: Adding functions that are used to store the raw
representation of a double in the raw bits of unsigned
longlong in a way that the binary representation
remains the same.
