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#==== Purpose ====
#
# This test script purpose is to check semisync replication
# behaviour when there are semisync slaves getting added and
# removed while dml changes are happening.
#
#==== Implementation ====
#
# 1) Install semisync on one Master and 8 Slaves.
# 2) Using mysqlslap, keep inserting data in background on Master.
# 3) While the DMLs are going on, keep adding/removing semisync slaves.
# 4) At the end of the step-3, check that the data is synced without any
#    issues.
# 5) Check semisync is still enabled on Master and all slaves.
#
#==== References ====
#
# Bug#27610678 SEMI-SYNC REPLICATION DOESN'T WORK FOR MINUTES AFTER RESTART
#              REPLICATION
#
#========
#
# 9 servers + 5000 inserts involved in test. Hence marking it as big-test.
#
--source include/big_test.inc
--source include/not_group_replication_plugin.inc
--source include/have_binlog_format_statement.inc
--source include/have_debug.inc

#
# One Master and 8 Slaves in the semi sync topology.
#
--let rpl_topology=1->2, 1->3, 1->4, 1->5, 1->6, 1->7, 1->8, 1->9
--source include/rpl_init.inc

--echo #
--echo # 1. Initial data.
--echo #
call mtr.add_suppression("Timeout waiting for reply of binlog");
CREATE TABLE t1(c1 INT);
--source include/rpl_sync.inc

--echo #
--echo # 2. Install semisync on all the 9 servers.
--echo #
--let $i= 1
while ($i < 10)
{
  --let $rpl_connection_name= server_$i
  --source include/rpl_connection.inc
  if ( $i == 1)
  {
    --connect(server1_1, localhost,root,,,$MASTER_MYPORT)
    CALL mtr.add_suppression("Semi-sync master failed on net_flush.*");
    --source include/install_semisync_master.inc
  }
  if ( $i != 1 )
  {
    CALL mtr.add_suppression("Semi-sync slave net_flush.*");
    --source include/install_semisync_slave.inc
  }
  --inc $i
}

--echo #
--echo # 3. Make Master aware of 8 semisync slaves.
--echo #
--let $rpl_connection_name= server1_1
--source include/rpl_connection.inc
--let $slaves = 8
--eval SET GLOBAL rpl_semi_sync_master_wait_for_slave_count = $slaves

--echo #
--echo # 4. Insert 5000 tuples in background using 10 parallel connections.
--echo #
--exec_in_background $MYSQL_SLAP --create-schema=test --delimiter=";" --iterations=500 --query="INSERT INTO t1 values (1)" --concurrency=10 --silent 2>&1

--echo #
--echo # 5. While the insert operations are going in the background, keep
--echo #    adding/removing semisync slaves randomly.
--echo #
--let $rpl_connection_silent = 1
--let $include_silent= 1
--disable_result_log
--disable_query_log
--let $rpl_debug= 0
--let $iter= 1
while ( $iter < 50 )
{
  # Random server_id generator ( server_id will between [2-9]
  --let $server_id=`SELECT FLOOR(2 + ((RAND() * 100) % 8))`
  --let $rpl_connection_name= server_$server_id
  --source include/rpl_connection.inc
  --let $service_state= `SELECT service_state FROM performance_schema.replication_connection_status`
  if ($service_state == 'ON')
  {
    # If the replication state is ON, bring it down.
    --source include/stop_slave.inc
    --let $rpl_connection_name= server1_1
    --source include/rpl_connection.inc
    # Adjust rpl_semi_sync_master_wait_for_slave_count variable.
    --dec $slaves
    --eval SET GLOBAL rpl_semi_sync_master_wait_for_slave_count = $slaves
  }
  if ($service_state == 'OFF')
  {
    # If the replication state is OFF, bring it up.
    --source include/start_slave.inc
    --let $rpl_connection_name= server1_1
    --source include/rpl_connection.inc
    # Adjust rpl_semi_sync_master_wait_for_slave_count variable.
    --inc $slaves
    --eval SET GLOBAL rpl_semi_sync_master_wait_for_slave_count = $slaves
  }
  --inc $iter
  # Do it slowly while insertions on the master are happening in the background.
  sleep 1;
}

--echo #
--echo # 6. Add all 8 semisync slaves back to Master
--echo #     (if they were disconnected, in above step).
--echo #
--let $iter = 2
while ($iter <= 9)
{
  --let $rpl_connection_name= server_$iter
  --source include/rpl_connection.inc
  --let $service_state= `SELECT service_state FROM performance_schema.replication_connection_status`
  if ($service_state == 'OFF')
  {
    --source include/start_slave.inc
    --let $rpl_connection_name= server1_1
    --source include/rpl_connection.inc
    # Adjust rpl_semi_sync_master_wait_for_slave_count variable.
    --inc $slaves
    --eval SET GLOBAL rpl_semi_sync_master_wait_for_slave_count = $slaves
  }
  --inc $iter
}
--enable_result_log
--enable_query_log
--let $rpl_connection_silent = 0
--let $include_silent= 0


--echo #
--echo # 7. Make sure the data is synced on Master without any issues.
--echo #
--let $rpl_connection_name= server_1
--source include/rpl_connection.inc
--let $wait_timeout= 60
--let $wait_condition= SELECT count(*) = 5000 FROM t1
--source include/wait_condition.inc
--let $slave_timeout=600
--source include/rpl_sync.inc

--echo #
--echo # 8. Check on all servers semisync is enabled after the
--echo #    the experiment and then uninstall semisync pluging
--echo #    from it.
--echo #
--let $i= 9
while ($i >= 1)
{
  --let $rpl_connection_name= server_$i
  --source include/rpl_connection.inc
  if ( $i == 1)
  {
    --let $assert_variable_name= rpl_semi_sync_master_enabled
    --let $assert_variable_value= 1
    --source include/assert_variable.inc
    --source include/uninstall_semisync_master.inc
  }
  if ( $i != 1 )
  {
    --let $assert_variable_name= rpl_semi_sync_slave_enabled
    --let $assert_variable_value= 1
    --source include/assert_variable.inc
    --source include/uninstall_semisync_slave.inc
  }
  --dec $i
}

--echo #
--echo # 9. Cleanup time.
--echo #
--let $rpl_connection_name= server_1
--source include/rpl_connection.inc
DROP TABLE t1;
--source include/rpl_end.inc