#
# MDEV-11675 Two phase ALTER binlogging 
#
#   Prove that FTWRL in the middle of START and "COMPLETE" parts of ALTER
#   is safe.

--source include/have_debug.inc
--source include/have_innodb.inc
--source include/master-slave.inc

--connection slave
--let $slave_parallel_threads= `select @@slave_parallel_threads`
--let $slave_parallel_mode= `select @@slave_parallel_mode`
--let $debug = `SELECT @@global.debug_dbug`

--source include/stop_slave.inc

SET @@global.slave_parallel_threads=4;
SET @@global.slave_parallel_mode=optimistic;
CHANGE MASTER TO master_use_gtid=slave_pos;

SET @@global.debug_dbug="+d,at_write_start_alter";
--source include/start_slave.inc

--connection master
SET @@session.binlog_alter_two_phase=true;

CREATE TABLE t1 (a INT) ENGINE=innodb;
--source include/save_master_gtid.inc

# Make sure the table exists on slave now.
--connection slave
--source include/sync_with_master_gtid.inc

--connection master
SET @@session.alter_algorithm='INSTANT';
SET @@session.gtid_domain_id=11;
ALTER TABLE t1 ADD COLUMN b int;


--echo # START Alter having exclusive lock is waiting for the signal
--connection slave
--let $wait_condition = SELECT COUNT(*) = 1 FROM INFORMATION_SCHEMA.PROCESSLIST WHERE STATE = 'debug sync point: now'
--source include/wait_condition.inc

--echo # FTWRL is sent first to wait for SA
--connection slave1
--send FLUSH TABLES WITH READ LOCK

--echo # SA completes
# First wait for the FTWRL arrival.
--connection slave
--let $wait_condition = SELECT COUNT(*) = 1 FROM INFORMATION_SCHEMA.PROCESSLIST WHERE INFO = 'FLUSH TABLES WITH READ LOCK' and STATE = 'Waiting for worker threads to pause for global read lock'
--source include/wait_condition.inc

set DEBUG_SYNC= "now signal alter_cont";

--connection slave1
--reap

# Commit ALTER is hanging now
--connection slave
--let $wait_condition = SELECT COUNT(*) = 1 FROM INFORMATION_SCHEMA.PROCESSLIST WHERE COMMAND = 'Slave_worker' AND STATE = 'Waiting for backup lock'
--source include/wait_condition.inc

--echo # Release CA
--connection slave1
UNLOCK TABLES;

--connection master
--sync_slave_with_master

SHOW CREATE TABLE t1;
--source include/show_binlog_events.inc

--connection master
DROP TABLE t1;

--sync_slave_with_master

--echo # cleanup
--connection slave
set DEBUG_SYNC = RESET;
--source include/stop_slave.inc
--eval set global slave_parallel_threads = $slave_parallel_threads
--eval set global slave_parallel_mode = $slave_parallel_mode
--eval set @@global.debug_dbug = "$debug"
--source include/start_slave.inc


--source include/rpl_end.inc