mariadb/mysql-test/suite/rpl/t/rpl_semi_sync_uninstall_plugin.test

###############################################################################
# Bug#17638477 UNINSTALL AND INSTALL SEMI-SYNC PLUGIN CAUSES SLAVES TO BREAK
#  Problem: Uninstallation of Semi sync plugin should be blocked when it is
#  in use.
#  Test case: Uninstallation of semi sync should be allowed
#   On Master:
#     1) When there is no dump thread
#     2) When there are no semi sync slaves (i.e., async replication).
#   On Slave:
#     1) When there is no I/O thread
#     2) When there are no semi sync enabled I/O thread (i.e.,async replication).
###############################################################################

--source include/have_semisync_plugin.inc
--source include/not_embedded.inc
--source include/have_binlog_format_statement.inc
--source include/master-slave.inc

call mtr.add_suppression("Read semi-sync reply network error");
call mtr.add_suppression("Timeout waiting for reply of binlog");

###############################################################################
# Case 1: Uninstallation of semi sync plugins should be allowed when it is
#  not in use i.e., when asynchronous replication is active.
###############################################################################
# Step 1.1: Install semi sync master plugin on master
INSTALL PLUGIN rpl_semi_sync_master SONAME 'semisync_master';

# Step 1.2: Install semi sync slave plugin on slave
--connection slave
INSTALL PLUGIN rpl_semi_sync_slave SONAME 'semisync_slave';

# Step 1.3: Uninstallation of semisync plugin on master and slave should be
#  allowed at this state as there is no semi sync replication enabled between
#  master and slave.
UNINSTALL PLUGIN rpl_semi_sync_slave;
--connection master
UNINSTALL PLUGIN rpl_semi_sync_master;

# Step 1.4: Check that replication is working fine at the end of the test case.
CREATE TABLE t1(i int);
INSERT INTO t1 values (1);
DROP TABLE t1;
--sync_slave_with_master

###############################################################################
# Case 2: Uninstallation of semi sync plugins should be disallowed
#  when it is in use i.e., when semi sync replication is active
###############################################################################
# Step 2.1: Install and enable semi sync replication between master and slave
--source include/install_semisync.inc

# Step 2.2: Check that rpl_semi_sync_slave uninstallation on Slave is not
#  possible at this state
--connection slave
show global status like "Slave%_running";

UNINSTALL PLUGIN rpl_semi_sync_slave;
select plugin_name,plugin_status from information_schema.plugins where plugin_name like 'rpl_%';

# Step 2.3: Check that rpl_semi_sync_master uninstallation on Master is not
#  possible at this state
--connection master

# The following is to catch errors if the next uninstall plugin would succeed
let $slaves_connected_value= query_get_value(SHOW GLOBAL STATUS LIKE 'Slaves_connected', Value, 1);
if (`SELECT $slaves_connected_value <> 1`)
{
  SHOW GLOBAL STATUS LIKE 'Slave_connections';
  SHOW GLOBAL STATUS LIKE 'Slaves_connected';
  --die *** Unexpected number of connected slaves ***
}
UNINSTALL PLUGIN rpl_semi_sync_master;
select plugin_name,plugin_status from information_schema.plugins where plugin_name like 'rpl_%';

# Step 2.4: Check that replication is working fine at the end of the test case.
CREATE TABLE t1(i int);
INSERT INTO t1 values (2);
DROP TABLE t1;
--sync_slave_with_master

# Step 2.5: Make sure rpl_semi_sync_master_status on Master and
# rpl_semi_sync_slave_staus on Slave are ON
show status like "Rpl_semi_sync_slave_status";

###############################################################################
# Case 3: Uninstallation of semi sync plugin should be disallowed when there
#  are semi sync slaves even though rpl_semi_sync_master_enabled= OFF;.
###############################################################################
# Step 3.1: Disable semi sync on master
--connection master
show status like "Rpl_semi_sync_master_status";

# Step 3.2: Check that still Rpl_semi_sync_master_clients is 1
show status like "Rpl_semi_sync_master_clients";

# Step 3.3: Since Rpl_semi_sync_master_clients is 1, uninstallation of
#  rpl_semi_sync_master should be disallowed.
select plugin_name,plugin_status from information_schema.plugins where plugin_name like 'rpl_%';

###############################################################################
# Case 4: Uninstallation of semi sync plugin should be allowed when it is not
#  in use. Same as Case 1 but this case is to check the case after enabling and
#  disabling semi sync replication.
###############################################################################

# Step 4.1: Stop IO thread on slave.
--connection slave
--source include/stop_slave.inc

# Step 4.2: Disable semi sync on slave.
select plugin_name,plugin_status from information_schema.plugins where plugin_name like 'rpl_%';

--connection master
# Send something to the slave so that the master would notice that nobody's listening.
create table t2 (a int); drop table t2;
# and wait for plugin to be unloaded automatically
let $wait_condition=select count(*) = 0 from information_schema.plugins where plugin_name like 'rpl_%';
--source include/wait_condition.inc

--connection slave

# Step 4.3: Start IO thread on slave.
--source include/start_slave.inc

# Step 4.4: Uninstall semi sync plugin, it should be successful now.
select plugin_name,plugin_status from information_schema.plugins where plugin_name like 'rpl_%';

# Step 4.7: Check that replication is working fine at the end of the test case
--connection master
CREATE TABLE t1(i int);
INSERT INTO t1 values (3);
DROP TABLE t1;
--sync_slave_with_master

# Cleanup
source include/rpl_end.inc;