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c7bbd8917c
Bug#25422 (Hang with log tables)
Bug 17876 (Truncating mysql.slow_log in a SP after using cursor locks the
thread)
Bug 23044 (Warnings on flush of a log table)
Bug 29129 (Resetting general_log while the GLOBAL READ LOCK is set causes
a deadlock)
Prior to this fix, the server would hang when performing concurrent
ALTER TABLE or TRUNCATE TABLE statements against the LOG TABLES,
which are mysql.general_log and mysql.slow_log.
The root cause traces to the following code:
in sql_base.cc, open_table()
if (table->in_use != thd)
{
/* wait_for_condition will unlock LOCK_open for us */
wait_for_condition(thd, &LOCK_open, &COND_refresh);
}
The problem with this code is that the current implementation of the
LOGGER creates 'fake' THD objects, like
- Log_to_csv_event_handler::general_log_thd
- Log_to_csv_event_handler::slow_log_thd
which are not associated to a real thread running in the server,
so that waiting for these non-existing threads to release table locks
cause the dead lock.
In general, the design of Log_to_csv_event_handler does not fit into the
general architecture of the server, so that the concept of general_log_thd
and slow_log_thd has to be abandoned:
- this implementation does not work with table locking
- it will not work with commands like SHOW PROCESSLIST
- having the log tables always opened does not integrate well with DDL
operations / FLUSH TABLES / SET GLOBAL READ_ONLY
With this patch, the fundamental design of the LOGGER has been changed to:
- always open and close a log table when writing a log
- remove totally the usage of fake THD objects
- clarify how locking of log tables is implemented in general.
See WL#3984 for details related to the new locking design.
Additional changes (misc bugs exposed and fixed):
1)
mysqldump which would ignore some tables in dump_all_tables_in_db(),
but forget to ignore the same in dump_all_views_in_db().
2)
mysqldump would also issue an empty "LOCK TABLE" command when all the tables
to lock are to be ignored (numrows == 0), instead of not issuing the query.
3)
Internal errors handlers could intercept errors but not warnings
(see sql_error.cc).
4)
Implementing a nested call to open tables, for the performance schema tables,
exposed an existing bug in remove_table_from_cache(), which would perform:
in_use->some_tables_deleted=1;
against another thread, without any consideration about thread locking.
This call inside remove_table_from_cache() was not required anyway,
since calling mysql_lock_abort() takes care of aborting -- cleanly -- threads
that might hold a lock on a table.
This line (in_use->some_tables_deleted=1) has been removed.
191 lines
5.1 KiB
Text
191 lines
5.1 KiB
Text
-- source include/not_embedded.inc
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--source include/have_csv.inc
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--disable_ps_protocol
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set global general_log= OFF;
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truncate table mysql.general_log;
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truncate table mysql.slow_log;
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show global variables
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where Variable_name = 'log' or Variable_name = 'log_slow_queries' or
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Variable_name = 'general_log' or Variable_name = 'slow_query_log';
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flush logs;
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set global general_log= ON;
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create table t1(f1 int);
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--replace_column 1 TIMESTAMP 2 USER_HOST 3 #
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select * from mysql.general_log;
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set global general_log= OFF;
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drop table t1;
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--replace_column 1 TIMESTAMP 2 USER_HOST 3 #
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select * from mysql.general_log;
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set global general_log= ON;
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flush logs;
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show global variables
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where Variable_name = 'log' or Variable_name = 'log_slow_queries' or
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Variable_name = 'general_log' or Variable_name = 'slow_query_log';
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connect (con1,localhost,root,,);
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connection con1;
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set session long_query_time=1;
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select sleep(2);
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--replace_column 1 TIMESTAMP 2 USER_HOST 3 QUERY_TIME
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select * from mysql.slow_log;
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connection default;
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set global slow_query_log= ON;
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connection con1;
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set session long_query_time=1;
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select sleep(2);
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--replace_column 1 TIMESTAMP 2 USER_HOST 3 QUERY_TIME
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select * from mysql.slow_log;
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connection default;
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show global variables
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where Variable_name = 'log' or Variable_name = 'log_slow_queries' or
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Variable_name = 'general_log' or Variable_name = 'slow_query_log';
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set global general_log= ON;
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set global general_log= OFF;
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set global general_log= OFF;
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set global slow_query_log= ON;
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set global slow_query_log= OFF;
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set global slow_query_log= OFF;
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set global general_log= ON;
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truncate table mysql.general_log;
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create table t1(f1 int);
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drop table t1;
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--replace_column 1 TIMESTAMP 2 USER_HOST 3 #
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select * from mysql.general_log;
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set global general_log= OFF;
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truncate table mysql.general_log;
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--replace_column 1 TIMESTAMP 2 USER_HOST 3 #
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select * from mysql.general_log;
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set global general_log= ON;
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show global variables
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where Variable_name = 'log' or Variable_name = 'log_slow_queries' or
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Variable_name = 'general_log' or Variable_name = 'slow_query_log';
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--replace_column 2 #
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show variables like 'general_log_file';
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--replace_column 2 #
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show variables like 'slow_query_log_file';
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show variables like 'log_output';
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# Can't set general_log_file to a non existing file
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--error 1231
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set global general_log_file='/not exiting path/log.master';
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# Can't set general_log_file to a directory
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--replace_result $MYSQLTEST_VARDIR MYSQLTEST_VARDIR
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--error 1231
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eval set global general_log_file='$MYSQLTEST_VARDIR';
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# Can't set general_log_file to empty string
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--error 1231
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set global general_log_file='';
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--replace_column 2 #
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show variables like 'general_log_file';
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set global general_log= OFF;
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--replace_result $MYSQLTEST_VARDIR MYSQLTEST_VARDIR
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eval set global general_log_file='$MYSQLTEST_VARDIR/tmp/log.master';
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set global general_log= ON;
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create table t1(f1 int);
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drop table t1;
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set global general_log= OFF;
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set global general_log_file=default;
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set global general_log= ON;
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create table t1(f1 int);
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drop table t1;
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--replace_column 2 #
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show variables like 'general_log_file';
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--replace_column 2 #
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show variables like 'slow_query_log_file';
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set global general_log= default;
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set global slow_query_log= default;
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set global general_log_file= default;
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set global slow_query_log_file= default;
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show variables like 'general_log';
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show variables like 'slow_query_log';
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set global general_log=ON;
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set global log_output=default;
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show variables like 'log_output';
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set global general_log=OFF;
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set global log_output=FILE;
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truncate table mysql.general_log;
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show variables like 'log_output';
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set global general_log=ON;
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create table t1(f1 int);
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--replace_column 1 TIMESTAMP 2 USER_HOST 3 #
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select * from mysql.general_log;
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set global general_log=OFF;
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set global log_output="FILE,TABLE";
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show variables like 'log_output';
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set global general_log=ON;
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drop table t1;
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--replace_column 1 TIMESTAMP 2 USER_HOST 3 #
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select * from mysql.general_log;
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#
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# Bug#29129 (Resetting general_log while the GLOBAL READ LOCK is set causes
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# a deadlock)
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# save state
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SET @old_general_log_state = @@global.general_log;
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SET @old_slow_log_state = @@global.slow_query_log;
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# Test ON->OFF transition under a GLOBAL READ LOCK
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SET GLOBAL general_log = ON;
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SET GLOBAL slow_query_log = ON;
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FLUSH TABLES WITH READ LOCK;
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SET GLOBAL general_log = OFF;
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SET GLOBAL slow_query_log = OFF;
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UNLOCK TABLES;
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# Test OFF->ON transition under a GLOBAL READ LOCK
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FLUSH TABLES WITH READ LOCK;
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SET GLOBAL general_log = ON;
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SET GLOBAL slow_query_log = ON;
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UNLOCK TABLES;
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# Test ON->OFF transition under a GLOBAL READ_ONLY
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SET GLOBAL READ_ONLY = ON;
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SET GLOBAL general_log = OFF;
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SET GLOBAL slow_query_log = OFF;
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SET GLOBAL READ_ONLY = OFF;
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# Test OFF->ON transition under a GLOBAL READ_ONLY
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SET GLOBAL READ_ONLY = ON;
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SET GLOBAL general_log = ON;
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SET GLOBAL slow_query_log = ON;
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SET GLOBAL READ_ONLY = OFF;
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# Restore state
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SET GLOBAL general_log = @old_general_log_state;
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SET GLOBAL slow_query_log = @old_slow_log_state;
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--enable_ps_protocol
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#
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# Cleanup (must be done last to avoid delayed 'Quit' message in general log)
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#
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disconnect con1;
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# Remove the log files that was created in the "default location"
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# i.e var/run
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--remove_file $MYSQLTEST_VARDIR/run/master.log
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