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Jan Lindström ec49976e38 MDEV-19746: Galera test failures because of wsrep_slave_threads identification

Problem was that tests select INFORMATION_SCHEMA.PROCESSLIST processes
from user system user and empty state. Thus, there is not clear
state for slave threads.

Changes:
- Added new status variables that store current amount of applier threads
(wsrep_applier_thread_count) and rollbacker threads
(wsrep_rollbacker_thread_count). This will make clear how many slave threads
of certain type there is.
- Added THD state "wsrep applier idle" when applier slave thread is
waiting for work. This makes finding slave/applier threads easier.
- Added force-restart option for mtr to always restart servers between tests
to avoid race on start of the test
- Added wait_condition_with_debug to wait until the passed statement returns
true, or the operation times out. If operation times out, the additional error
statement will be executed

Changes to be committed:
	new file:   mysql-test/include/force_restart.inc
	new file:   mysql-test/include/wait_condition_with_debug.inc
	modified:   mysql-test/mysql-test-run.pl
	modified:   mysql-test/suite/galera/disabled.def
	modified:   mysql-test/suite/galera/r/MW-336.result
	modified:   mysql-test/suite/galera/r/galera_kill_applier.result
	modified:   mysql-test/suite/galera/r/galera_var_slave_threads.result
	new file:   mysql-test/suite/galera/t/MW-336.cnf
	modified:   mysql-test/suite/galera/t/MW-336.test
	modified:   mysql-test/suite/galera/t/galera_kill_applier.test
	modified:   mysql-test/suite/galera/t/galera_parallel_autoinc_largetrx.test
	modified:   mysql-test/suite/galera/t/galera_parallel_autoinc_manytrx.test
	modified:   mysql-test/suite/galera/t/galera_var_slave_threads.test
	modified:   mysql-test/suite/wsrep/disabled.def
	modified:   mysql-test/suite/wsrep/r/variables.result
	modified:   mysql-test/suite/wsrep/t/variables.test
	modified:   sql/mysqld.cc
	modified:   sql/wsrep_mysqld.cc
	modified:   sql/wsrep_mysqld.h
	modified:   sql/wsrep_thd.cc
	modified:   sql/wsrep_var.cc

2019-07-15 10:17:07 +03:00

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 # ==== Purpose ====
 #
 # Tell mtr that all servers must be restarted after the test has
 # finished.
 #
 # ==== Usage ====
 #
 # --source include/force_restart.inc
 #
 --let $_force_restart_datadir= `SELECT @@datadir`
 --append_file $_force_restart_datadir/mtr/force_restart
 
 EOF