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################################################################################
# Bug#18338203 P_S REPLICATION_CONNECTION_STATUS.SOURCE_UUID UNINITIALIZED VALUE
#
# The master_uuid field was introduced in mysql-5.6.0.
# When replicating from a pre-5.6.0 master to a 5.7 slave,
# the slave will ask for the master_uuid field which the master doesnt have.
# Prior to fix, the P_S code made an assuption that if there is a master
# there will be a master_uuid for the master which is not true in the case
# of say 5.5->5.7 replication. Since the P_S code blindly copied MASTER_UUID
# bytes from mi object, we ended up with a garbage value in the select
# SOURCE_UUID field from P_S.replication_connect_status
################################################################################
--source include/not_group_replication_plugin.inc
--source include/have_debug_sync.inc
# Testing it in one mode is enough
--source include/have_binlog_format_row.inc
--source include/master-slave.inc

--source include/rpl_connection_slave.inc
--source include/stop_slave.inc

--let $orig_master_uuid= query_get_value(select source_uuid from performance_schema.replication_connection_status, source_uuid, 1)

--echo #
--echo # Explicitly simulate a NULL master_uuid return value i.e., fake as a pre-5.6 master.
--echo #

SET @save_debug= @@GLOBAL.debug;
SET GLOBAL debug= '+d,dbug.return_null_MASTER_UUID';

--echo #
--echo # We should still have the master_uuid value.
--echo #

--let $instrumented_master_uuid= query_get_value(select source_uuid from performance_schema.replication_connection_status, source_uuid, 1)

--let $assert_text= source_uuid field should be non-empty.
--let $assert_cond= "$instrumented_master_uuid" != ""
--source include/assert.inc

--let $instrumented_master_uuid=

--echo #
--echo # START SLAVE will return a NULL for master_uuid now as per our debug behaviour.
--echo #

--source include/start_slave.inc

--echo #
--echo # We dont have a master_uuid now, so should see an empty output as the master_uuid value.
--echo #

--let $wait_condition=select source_uuid = "" from performance_schema.replication_connection_status
--source include/wait_condition.inc

--echo #
--echo # de-activate the debug behaviour.
--echo #

SET GLOBAL debug= '-d,dbug.return_null_MASTER_UUID';
SET GLOBAL debug= @save_debug;

--echo #
--echo # After de-activating, the master_uuid value should be there.
--echo #

--source include/stop_slave.inc
--source include/start_slave.inc

--echo #
--echo # Verify that we have the master_uuid now.
--echo #

--let $wait_condition=select source_uuid = "$orig_master_uuid" from performance_schema.replication_connection_status
--source include/wait_condition.inc

--let $wait_condition=
--let $orig_master_uuid=
--source include/rpl_end.inc