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################################################################################
#
# The auto-rejoin process is a mechanism that allows a server that left the
# group due to flaky network (either on his side or on the other members) to
# try to join again up to group_replication_autorejoin_tries number of times.
#
# This test shall verify that upon a member expel, if auto-rejoin is enabled,
# the expelled member will try to rejoin the group up to
# group_replication_autorejoin_tries number of times. It will also verify that,
# if the rejoining member was a primary before being expelled, when that member
# is successfully rejoined to the group, it will remain a secondary.
#
# Test:
# 0) The test requires three servers (in single-primary mode).
# 1) Expel the primary.
# 2) Verify that the expelled member will try to rejoin the group the number of
# times it is configured in group_replication_autorejoin_tries sysvar.
# 3) Verify that it manages to rejoin the group
# 4) Verify that the newly rejoined member is no longer the primary.
# 5) Cleanup.
#
################################################################################
--source include/big_test.inc
--source include/have_debug_sync.inc
--source include/linux.inc
--source include/have_group_replication_plugin.inc
#
# We manually start the group because we need to set the rejoin timeout before
# the START GROUP_REPLICATION command.
#
--let $rpl_skip_group_replication_start= 1
--let $rpl_server_count = 3
--let $rpl_group_replication_single_primary_mode=1
--source include/group_replication.inc
--echo
--echo ####
--echo # 0) The test requires three servers.
--echo ####
--echo
SET sql_log_bin = 0;
call mtr.add_suppression("Member was expelled from the group due to network failures, changing member status to ERROR.");
call mtr.add_suppression("The server was automatically set into read only mode after an error was detected.");
call mtr.add_suppression("Started auto-rejoin procedure attempt*");
call mtr.add_suppression("Auto-rejoin procedure attempt*");
SET sql_log_bin = 1;
--source include/gr_autorejoin_monitoring.inc
SET @debug_saved = @@GLOBAL.DEBUG;
SET @@GLOBAL.DEBUG='+d,group_replication_rejoin_short_retry';
SET @@GLOBAL.DEBUG='+d,group_replication_stop_before_rejoin';
--source include/start_and_bootstrap_group_replication.inc
--let $rpl_connection_name = server2
--source include/rpl_connection.inc
--source include/start_group_replication.inc
--let $rpl_connection_name = server3
--source include/rpl_connection.inc
--source include/start_group_replication.inc
--echo
--echo ####
--echo # 1) Expel one of the members.
--echo ####
--echo
--let $rpl_connection_name = server1
--source include/rpl_connection.inc
# First, enable auto-rejoin
SET GLOBAL group_replication_autorejoin_tries = 1;
# Force expel on member 1
--let $member_id = `SELECT @@GLOBAL.server_uuid`
--source include/gr_expel_member_from_group.inc
--echo
--echo ####
--echo # 2) Verify that the expelled member will try to rejoin the group the
--echo # number of it is configured in group_replication_autorejoin_tries
--echo # sysvar.
--echo ####
--echo
--let $rpl_connection_name = server1
--source include/rpl_connection.inc
SET DEBUG_SYNC = "now WAIT_FOR signal.autorejoin_waiting";
# Wait for the group to stabilize and find a new primary
--let $rpl_connection_name = server2
--source include/rpl_connection.inc
--let $group_replication_number_of_members = 2
--source include/gr_wait_for_number_of_members.inc
--let $rpl_connection_name = server3
--source include/rpl_connection.inc
--let $group_replication_number_of_members = 2
--source include/gr_wait_for_number_of_members.inc
--source include/gr_find_a_primary.inc
if (!$group_replication_found_primary_out_var)
{
--die "Should have found a primary after member expel!"
}
--let $rpl_connection_name = server1
--source include/rpl_connection.inc
# Verify that auto-rejoin is currently running
--let $assert_text = Auto-rejoin should be running
--let $assert_cond = [SELECT IS_AUTOREJOIN_RUNNING()] = TRUE
--source include/assert.inc
--let $assert_text= super_read_only should be enabled
--let $assert_cond= [SELECT @@GLOBAL.super_read_only] = 1;
--source include/assert.inc
# Verify that it attempted one try
--let $assert_text = We should have attempted 1 rejoin
--let $assert_cond = [SELECT GET_NUMBER_RETRIES()] = 1
--source include/assert.inc
SET DEBUG_SYNC = "now SIGNAL signal.autorejoin_continue";
# Verify that the auto-rejoin process has terminated
--let $wait_condition = SELECT IS_AUTOREJOIN_RUNNING() = FALSE
--source include/wait_condition_or_abort.inc
--echo
--echo ####
--echo # 3) Verify that it manages to rejoin the group.
--echo ####
--echo
--let $group_replication_member_state = ONLINE
--let $group_replication_member_id = $member_id
--source include/gr_wait_for_member_state.inc
--let $group_replication_number_of_members = 3
--source include/gr_wait_for_number_of_members.inc
--let $rpl_connection_name = server2
--source include/rpl_connection.inc
--let $group_replication_number_of_members = 3
--source include/gr_wait_for_number_of_members.inc
--let $rpl_connection_name = server3
--source include/rpl_connection.inc
--let $group_replication_number_of_members = 3
--source include/gr_wait_for_number_of_members.inc
--echo
--echo ####
--echo # 4) Verify that the newly rejoined member is no longer the primary.
--echo ####
--echo
--let $rpl_connection_name = server1
--source include/rpl_connection.inc
--source include/gr_assert_secondary_member.inc
--echo
--echo ####
--echo # 5) Cleanup.
--echo ####
--echo
# Stop the GR plugin so that we leave super read-only mode and drop the auto-rejoin monitoring functions
--source include/stop_group_replication.inc
SET @@GLOBAL.DEBUG = @debug_saved;
SET @@GLOBAL.group_replication_autorejoin_tries = default;
--source include/gr_end_autorejoin_monitoring.inc
--source include/group_replication_end.inc
|
