################################################################################
# This test confirms that:
# 1: On applier failure clone does not start.
# 2: During clone group_replication_applier SQL thread is OFF.
# 3: If clone fails group_replication_applier is restarted and pending
#    transactions(relay logs) are applied.
#
# Test:
# 0. The test requires two servers: M1 and M2
# 1. Bootstrap M1 and install clone plugin.
# 2. Setup clone on M2.
# 3. Force clone. Force applier failure on M2.
#    Start GR on M2 fails. Applier fails before clone stops applier.
#    Assert clone never starts.
# 4. Reset debug points for applier failures.
#    Restart GR on M2.
#    Assert clone starts and group_replication_applier SQL thread is OFF.
# 5. Stop applier on M2.
#    Uninstall clone on M1 so that clone fails.
#    Create some transactions on M1 to create applier backlog on M2.
# 6. Stop GR on M2 and block applier.
#    Create transactions on M1 for M2 to clone.
# 7. Start GR on M2 and unblock applier when clone is started.
#    Assert pending transactions are applied when applier is restarted.
# 8. Cleanup.
################################################################################

--source include/big_test.inc
--source include/have_debug_sync.inc
--source include/have_mysqld_monitoring_process.inc
--source include/have_clone_plugin.inc
--source include/force_restart.inc
--source include/have_group_replication_plugin.inc
--let $rpl_skip_group_replication_start= 1
--source include/group_replication.inc

# Validate plugins
--let plugins = CLONE_PLUGIN,GROUP_REPLICATION
--source include/check_plugin_dir.inc

--echo
--echo # 1. Bootstrap M1 and install clone plugin.
--echo
--source include/start_and_bootstrap_group_replication.inc
--replace_result $CLONE_PLUGIN CLONE_PLUGIN
--eval INSTALL PLUGIN clone SONAME '$CLONE_PLUGIN'

CREATE TABLE t1 (a INT PRIMARY KEY);
INSERT INTO t1 values (1);
INSERT INTO t1 values (2);

--echo
--echo # 2. Setup clone on M2.
--echo

--let $rpl_connection_name= server2
--source include/rpl_connection.inc

--let $member2_uuid= query_get_value(SELECT @@SERVER_UUID, @@SERVER_UUID, 1)
--let $_group_replication_local_address= `SELECT @@GLOBAL.group_replication_local_address`
--let $_group_replication_group_seeds= `SELECT @@GLOBAL.group_replication_group_seeds`

--let $plugin_list= $GROUP_REPLICATION
--source include/spawn_monitoring_process.inc

--disable_query_log
--eval SET PERSIST group_replication_group_name= "$group_replication_group_name"
--eval SET PERSIST group_replication_local_address= "$_group_replication_local_address"
--eval SET PERSIST group_replication_group_seeds= "$_group_replication_group_seeds"
SET PERSIST group_replication_start_on_boot= ON;
--enable_query_log
--replace_result $CLONE_PLUGIN CLONE_PLUGIN
--eval INSTALL PLUGIN clone SONAME '$CLONE_PLUGIN'

--echo
--echo # 3. Force clone. Force applier failure on M2.
--echo #    Start GR on M2 fails. Applier fails before clone stops applier.
--echo #    Assert clone never starts.
--echo

--let $rpl_connection_name= server2
--source include/rpl_connection.inc
--let $_group_replication_threshold_save= `SELECT @@GLOBAL.group_replication_clone_threshold`
SET GLOBAL group_replication_clone_threshold= 1;
--replace_result $group_replication_group_name GROUP_NAME
--eval SET GLOBAL group_replication_group_name= "$group_replication_group_name"
SET @@GLOBAL.DEBUG= '+d,force_sql_thread_error';
SET @@GLOBAL.DEBUG='+d,gr_clone_before_applier_stop';

--send START GROUP_REPLICATION;

--let $rpl_connection_name= server_2
--source include/rpl_connection.inc

--let $wait_condition= SELECT COUNT(*) = 1 FROM performance_schema.replication_applier_status WHERE CHANNEL_NAME="group_replication_applier" AND SERVICE_STATE = "OFF"
--source include/wait_condition_or_abort.inc

SET DEBUG_SYNC = 'now SIGNAL applier_stopped';

--let $rpl_connection_name= server2
--source include/rpl_connection.inc

# One of three things can happen:
# A. The applier fails after the join and the member leaves the group
#    but the START GROUP_REPLICATION command does not fail
# B. The applier fails after initialization and sets the state to ERROR,
#    making the group join fail that makes the START GROUP_REPLICATION
#    command fail with a generic ER_GROUP_REPLICATION_CONFIGURATION.
# C. The applier fails and its initialization processes catches the error.
#    During the start, it is known that the applier failed so the START
#    GROUP_REPLICATION fails with: ER_GROUP_REPLICATION_APPLIER_INIT_ERROR

--error 0, ER_GROUP_REPLICATION_CONFIGURATION, ER_GROUP_REPLICATION_APPLIER_INIT_ERROR
--reap

--let $assert_text= Clone must not start.
--let $assert_cond= [SELECT COUNT(*) FROM performance_schema.clone_status] = 0;
--source include/assert.inc

--echo
--echo # 4. Reset debug points for applier failures.
--echo #    Restart GR on M2.
--echo #    Assert clone starts and group_replication_applier SQL thread is OFF.
--echo

SET @@GLOBAL.DEBUG= '-d,force_sql_thread_error';
SET @@GLOBAL.DEBUG='-d,gr_clone_before_applier_stop';
SET DEBUG_SYNC= 'RESET';
SET @@GLOBAL.DEBUG='+d,gr_clone_wait';

START GROUP_REPLICATION;

SET DEBUG_SYNC = 'now WAIT_FOR gr_clone_paused';
SET @@GLOBAL.DEBUG='-d,gr_clone_wait';

--let $assert_text= group_replication_applier SQL Thread will be off.
--let $assert_cond= [SELECT COUNT(*) as count FROM performance_schema.replication_applier_status WHERE CHANNEL_NAME="group_replication_applier" AND SERVICE_STATE = "OFF",count, 1] = 1
--source include/assert.inc

SET DEBUG_SYNC = 'now SIGNAL gr_clone_continue';

--source include/wait_until_disconnected.inc

--let $rpl_server_number= 2
--source include/rpl_reconnect.inc

--let $group_replication_member_state=ONLINE
--source include/gr_wait_for_member_state.inc

--let $assert_text= Clone must be completed
--let $assert_cond= [SELECT state="Completed" FROM performance_schema.clone_status] = 1;
--source include/assert.inc

--echo
--echo # 5. Stop applier on M2.
--echo #    Uninstall clone on M1 so that clone fails.
--echo #    Create some transactions on M1 to create applier backlog on M2.
--echo

--source include/gr_stop_applier_sql_thread.inc

--let $rpl_connection_name= server1
--source include/rpl_connection.inc
UNINSTALL PLUGIN clone;
INSERT INTO t1 values (3);
INSERT INTO t1 values (4);

--let $rpl_connection_name= server2
--source include/rpl_connection.inc

--let $wait_condition= SELECT COUNT(*) = 1 FROM performance_schema.replication_group_member_stats WHERE member_id='$member2_uuid' AND count_transactions_remote_in_applier_queue = 2
--source include/wait_condition_or_abort.inc

--echo
--echo # 6. Stop GR on M2.
--echo #    Create transactions on M1 for M2 to clone.
--echo

STOP GROUP_REPLICATION;

--let $rpl_connection_name= server1
--source include/rpl_connection.inc
# Force clone.
INSERT INTO t1 values (5);
INSERT INTO t1 values (6);

--echo
--echo # 7. Block applier and start GR on M2.
--echo #    Unblock applier when clone is started.
--echo #    Assert pending transactions are applied when applier is restarted.
--echo

--let $rpl_connection_name= server2
--source include/rpl_connection.inc
SET GLOBAL group_replication_clone_threshold= 1;
SET @@GLOBAL.DEBUG='+d,block_applier_updates';
START GROUP_REPLICATION;

SET DEBUG_SYNC = "now WAIT_FOR applier_read_blocked";

--let $wait_condition= SELECT COUNT(*)=1 FROM performance_schema.threads WHERE PROCESSLIST_STATE="Group Replication Cloning process: Preparing";
--source include/wait_condition.inc

SET @@GLOBAL.DEBUG='-d,block_applier_updates';
SET DEBUG_SYNC = "now SIGNAL resume_applier_read";

--let $group_replication_member_state=ONLINE
--source include/gr_wait_for_member_state.inc

SET DEBUG_SYNC= 'RESET';

--let $diff_tables= server1:test.t1, server2:test.t1
--source include/diff_tables.inc

--echo
--echo # 8. Cleanup.
--echo

DROP TABLE t1;

--let $rpl_connection_name= server1
--source include/rpl_connection.inc
set session sql_log_bin=0;
call mtr.add_suppression("Timeout while waiting for the group communication engine to exit!");
call mtr.add_suppression("The member has failed to gracefully leave the group.");
set session sql_log_bin=1;

--let $rpl_connection_name= server2
--source include/rpl_connection.inc
set session sql_log_bin=0;
call mtr.add_suppression("Slave SQL for channel 'group_replication_applier': Relay log read failure: *.*");
call mtr.add_suppression("The applier thread execution was aborted. *.*");
call mtr.add_suppression("Error running query, slave SQL thread aborted. *");
call mtr.add_suppression("Fatal error during execution on the Applier process of Group Replication. The server will now leave the group.");
call mtr.add_suppression("Unable to confirm whether the server has left the group or not. Check performance_schema.replication_group_members to check group membership information.");
call mtr.add_suppression("The server was automatically set into read only mode after an error was detected.");
call mtr.add_suppression("Unable to initialize the Group Replication applier module.");
call mtr.add_suppression("There was a previous plugin error while the member joined the group. The member will now exit the group.");
call mtr.add_suppression("This member will start distributed recovery using clone. It is due to the number of missing transactions being higher than the configured threshold of 1.");
call mtr.add_suppression("Clone removing all user data for provisioning: *");
call mtr.add_suppression("Internal query: CLONE INSTANCE FROM *");
call mtr.add_suppression("There was an issue when cloning from another server: *");
call mtr.add_suppression("Due to some issue on the previous step distributed recovery is now executing: Incremental Recovery.");
call mtr.add_suppression("Timeout while waiting for the group communication engine to be ready!");
call mtr.add_suppression("The group communication engine is not ready for the member to join. .*");
call mtr.add_suppression("The member was unable to join the group.*");
set session sql_log_bin=1;

RESET PERSIST group_replication_group_name;
RESET PERSIST group_replication_local_address;
RESET PERSIST group_replication_group_seeds;
RESET PERSIST group_replication_start_on_boot;

--source include/clean_monitoring_process.inc
--source include/group_replication_end.inc