Bug#32135376: DON'T WARN FOR EXPECTED EVENTS WHEN USING SOURCE_CONNECTION_AUTO_FAILOVER=1

Issue
=====
When using CHANGE MASTER TO SOURCE_CONNECTION_AUTO_FAILOVER=1, and there is a
failover, the server prints few warnings to the error log. Some of these
below warnings sound more alarming than they actually are:

2020-11-06T08:57:48.079145Z 37 [Note]
[MY-010563] [Repl] Slave I/O thread for channel '' killed while connecting to
master

2020-11-06T08:57:49.086941Z 37 [Warning] [MY-010549] [Repl] The master's UUID
has changed, although this should not happen unless you have changed it
manually. The old UUID was 14d730cf-200e-11eb-9d08-0010e0734796.

Solution
========
1. The error message "Replica I/O thread for channel '' killed while
connecting to source" sounds as if something unexpected happened and the
server does not know why.

It will be replaced with below System-level message stating that the connection
has timed out after trying configured number of times, and therefore the server
is going to attempt an asynchronous replication connection failover to
following server.

"The connection has timed out after retries: %lu connecting to '%s@%s:%d'%s ,
 and therefore the MySQL server is going to attempt an asynchronous replication
 connection failover, to '%s@%s:%d'"

2. The error message "The source's UUID has changed, although this should not
happen unless you have changed it manually" sound more alarming. It is actually
expected that the UUID changes here.

It will be replaced with below message:

"The source server has changed from \'%s:%d\' with server_uuid %s, to \'%s:%d\'
 with server_uuid %s."

3. The error message:
"The master's UUID has changed, although this should not happen unless you have
 changed it manually. The old UUID was %s."

is replaced with below error messages:

i. When source UUID, host and port has changed:
"The Replica which was connected to source \'%s:%d\', is now connected to new
 source \'%s:%d\', but still has the same server_uuid %s."

ii. When source UUID is changed, but host and port is not changed:
"The server_uuid for source server \'%s:%d\' has changed from %s to %s. This
 should not happen unless you have changed it manually."

4. The error message:
"Replica I/O thread%s: connected to master '%s@%s:%d',replication started in log
 '%s' at position %s"

is replaced with below error messages:

i. When GTID-based replicaton is used:
"Replica receiver thread%s: connected to source \'%s@%s:%d\' with
 server_uuid=%s, server_id=%d. Starting GTID-based replication."

ii. When replication is using file name and position:
"Replica receiver thread%s: connected to source \'%s@%s:%d\' with
 server_uuid=%s, server_id=%d. Starting replication from file '%s', position
 '%s'."

Change-Id: If8f9a47f294fd951b76a2f51cc955fd777c0cf1d

Author: Hemant Dangi

mysql-test/include/mtr_warnings.sql

@@ -190,7 +190,7 @@ INSERT INTO global_suppressions VALUES
  ("You have an error in your SQL syntax"),
  ("deprecated"),
  ("equal MySQL server ids"),
- ("error .*connecting to source"),
+ ("Error .*connecting to source"),
  ("error reading log entry"),
  ("lower_case_table_names is set"),
  ("skip-name-resolve mode"),

mysql-test/suite/group_replication/include/gr_acf_membership_updates_2groups.inc

@@ -188,7 +188,6 @@ if (!$have_xcom_stack){
 
 SET SESSION sql_log_bin = 0;
 call mtr.add_suppression("The source .* for channel 'ch1' has joined the group .*, and so added its entry into replication_asynchronous_connection_failover table.");
-call mtr.add_suppression("The source's UUID has changed, although this should not happen unless you have changed it manually.");
 call mtr.add_suppression("The source .* for channel 'ch1' has left the group .*, and so removed its entry from replication_asynchronous_connection_failover table.");
 call mtr.add_suppression("The group .* for the channel .* has been removed, and so removed its entry from replication_asynchronous_connection_failover_managed and all the group members from replication_asynchronous_connection_failover table.");
 call mtr.add_suppression("The group .* for the channel .* has been added, and so added its entry in replication_asynchronous_connection_failover_managed and source to replication_asynchronous_connection_failover table.");

mysql-test/suite/group_replication/r/gr_acf_2groups_failover.result

@@ -81,7 +81,6 @@ include/assert.inc ['Last member from group B Server4 is one row in performance_
 SET SESSION sql_log_bin = 0;
 call mtr.add_suppression("The source .* for channel 'ch1' has joined the group .*, and so added its entry into replication_asynchronous_connection_failover table.");
 call mtr.add_suppression("The Monitor IO thread detected that the source .* does not belong to the group majority, thence the channel .* will try to connect to another source.");
-call mtr.add_suppression("The source's UUID has changed, although this should not happen unless you have changed it manually. The old UUID was.*");
 call mtr.add_suppression("The source .* for channel 'ch1' has left the group .*, and so removed its entry from replication_asynchronous_connection_failover table.");
 call mtr.add_suppression("The group .* for the channel .* has been removed, and so removed its entry from replication_asynchronous_connection_failover_managed and all the group members from replication_asynchronous_connection_failover table.");
 call mtr.add_suppression("The group .* for the channel .* has been added, and so added its entry in replication_asynchronous_connection_failover_managed and source to replication_asynchronous_connection_failover table.");

mysql-test/suite/group_replication/r/gr_acf_57_sources.result

@@ -53,9 +53,6 @@ include/assert.inc [Verify channel ch1 IO_THREAD is ON and connected to server1]
 ############################################################
 # 5. Clean up.
 [connection server4]
-SET SESSION sql_log_bin = 0;
-call mtr.add_suppression("The source's UUID has changed, although this should not happen unless you have changed it manually.");
-SET SESSION sql_log_bin = 1;
 include/stop_slave.inc [FOR CHANNEL 'ch1']
 include/rpl_reset_slave.inc
 SELECT asynchronous_connection_failover_delete_managed('ch1', 'GROUP');

mysql-test/suite/group_replication/r/gr_acf_connect_to_member_recovering.result

@@ -68,7 +68,6 @@ include/gr_wait_for_member_state.inc
 
 SET SESSION sql_log_bin = 0;
 call mtr.add_suppression("The source .* for channel 'ch1_3' has joined the group .*, and so added its entry into replication_asynchronous_connection_failover table.");
-call mtr.add_suppression("The source's UUID has changed, although this should not happen unless you have changed it manually. The old UUID was.*");
 call mtr.add_suppression("The IO thread detected that the source .* does not belong to the group majority, thence the channel .* will try to connect to another source.");
 call mtr.add_suppression("The group .* for the channel .* has been removed, and so removed its entry from replication_asynchronous_connection_failover_managed and all the group members from replication_asynchronous_connection_failover table.");
 call mtr.add_suppression("The group .* for the channel .* has been added, and so added its entry in replication_asynchronous_connection_failover_managed and source to replication_asynchronous_connection_failover table.");

mysql-test/suite/group_replication/r/gr_acf_error_state_handling.result

@@ -36,7 +36,6 @@ include/start_group_replication.inc
 include/start_group_replication.inc
 [connection server4]
 SET SESSION sql_log_bin = 0;
-call mtr.add_suppression("The source's UUID has changed, although this should not happen unless you have changed it manually. The old UUID was.*");
 call mtr.add_suppression("The source.*for channel.*has joined the group.*and so added its entry into replication_asynchronous_connection_failover table");
 call mtr.add_suppression("The .* for channel 'ch1_4' has left the group .*, and so removed its entry from replication_asynchronous_connection_failover table.");
 call mtr.add_suppression("The Monitor IO thread detected that the source .* does not belong to the group majority, thence the channel .* will try to connect to another source.");

mysql-test/suite/group_replication/r/gr_acf_group_member_maintenance.result

@@ -96,7 +96,6 @@ include/assert.inc ['There are no rows in performance_schema.replication_asynchr
 include/assert.inc ['There are no rows in performance_schema.replication_asynchronous_connection_failover_managed']
 SET SESSION sql_log_bin = 0;
 call mtr.add_suppression("The source .* for channel 'ch1' has joined the group .*, and so added its entry into replication_asynchronous_connection_failover table.");
-call mtr.add_suppression("The source's UUID has changed, although this should not happen unless you have changed it manually.*");
 call mtr.add_suppression("The Monitor IO thread detected that the source .* does not belong to the group majority, thence the channel .* will try to connect to another source.*");
 call mtr.add_suppression("The IO thread detected that the source .* does not belong to the group majority, thence the channel .* will try to connect to another source.");
 call mtr.add_suppression("The source .* for channel 'ch1' has left the group .*, and so removed its entry from replication_asynchronous_connection_failover table.");

mysql-test/suite/group_replication/r/gr_acf_join_unreachable_member.result

@@ -61,7 +61,6 @@ include/assert.inc ['There is no row in performance_schema.replication_asynchron
 
 SET SESSION sql_log_bin = 0;
 call mtr.add_suppression("The source .* for channel 'ch2_4' has joined the group .*, and so added its entry into replication_asynchronous_connection_failover table.");
-call mtr.add_suppression("The source's UUID has changed, although this should not happen unless you have changed it manually. The old UUID was.*");
 call mtr.add_suppression("The Monitor IO thread detected that the source .* does not belong to the group majority, thence the channel .* will try to connect to another source.");
 call mtr.add_suppression("The source .* for channel 'ch2_4' has left the group .*, and so removed its entry from replication_asynchronous_connection_failover table.");
 call mtr.add_suppression("The group .* for the channel .* has been removed, and so removed its entry from replication_asynchronous_connection_failover_managed and all the group members from replication_asynchronous_connection_failover table.");

mysql-test/suite/group_replication/r/gr_acf_membership_updates_2groups.result

@@ -70,7 +70,6 @@ include/stop_group_replication.inc
 [connection server5]
 SET SESSION sql_log_bin = 0;
 call mtr.add_suppression("The source .* for channel 'ch1' has joined the group .*, and so added its entry into replication_asynchronous_connection_failover table.");
-call mtr.add_suppression("The source's UUID has changed, although this should not happen unless you have changed it manually.");
 call mtr.add_suppression("The source .* for channel 'ch1' has left the group .*, and so removed its entry from replication_asynchronous_connection_failover table.");
 call mtr.add_suppression("The group .* for the channel .* has been removed, and so removed its entry from replication_asynchronous_connection_failover_managed and all the group members from replication_asynchronous_connection_failover table.");
 call mtr.add_suppression("The group .* for the channel .* has been added, and so added its entry in replication_asynchronous_connection_failover_managed and source to replication_asynchronous_connection_failover table.");

mysql-test/suite/group_replication/r/gr_acf_membership_updates_2groups_mysql.result

@@ -70,7 +70,6 @@ include/stop_group_replication.inc
 [connection server5]
 SET SESSION sql_log_bin = 0;
 call mtr.add_suppression("The source .* for channel 'ch1' has joined the group .*, and so added its entry into replication_asynchronous_connection_failover table.");
-call mtr.add_suppression("The source's UUID has changed, although this should not happen unless you have changed it manually.");
 call mtr.add_suppression("The source .* for channel 'ch1' has left the group .*, and so removed its entry from replication_asynchronous_connection_failover table.");
 call mtr.add_suppression("The group .* for the channel .* has been removed, and so removed its entry from replication_asynchronous_connection_failover_managed and all the group members from replication_asynchronous_connection_failover table.");
 call mtr.add_suppression("The group .* for the channel .* has been added, and so added its entry in replication_asynchronous_connection_failover_managed and source to replication_asynchronous_connection_failover table.");

mysql-test/suite/group_replication/r/gr_acf_monitor_io_stopping.result

@@ -67,7 +67,6 @@ include/stop_group_replication.inc
 SET SESSION sql_log_bin = 0;
 call mtr.add_suppression("The IO thread detected that the source .* does not belong to the group majority, thence the channel 'ch2' will try to connect to another source.");
 call mtr.add_suppression("The Monitor IO thread detected that the source .* does not belong to the group majority, thence the channel 'ch2' will try to connect to another source.");
-call mtr.add_suppression("The source's UUID has changed, although this should not happen unless you have changed it manually. The old UUID was.*");
 SET SESSION sql_log_bin = 1;
 include/stop_slave.inc [FOR CHANNEL 'ch2']
 include/assert.inc [Verify replica_monitor thread is not running]

mysql-test/suite/group_replication/r/gr_acf_msr_2groups_failover.result

@@ -89,7 +89,6 @@ include/assert_grep.inc [ch2 did not reconnect to server3]
 SET SESSION sql_log_bin = 0;
 call mtr.add_suppression("The IO thread detected that the source .* does not belong to the group majority, thence the channel .* will try to connect to another source.");
 call mtr.add_suppression("The Monitor IO thread detected that the source .* does not belong to the group majority, thence the channel .* will try to connect to another source.");
-call mtr.add_suppression("The source's UUID has changed, although this should not happen unless you have changed it manually. The old UUID was.*");
 SET SESSION sql_log_bin = 1;
 include/stop_slave.inc [FOR CHANNEL 'ch1']
 include/rpl_reset_slave.inc

mysql-test/suite/group_replication/r/gr_acf_not_change_if_recovering.result

@@ -64,7 +64,6 @@ include/gr_wait_for_member_state.inc
 
 SET SESSION sql_log_bin = 0;
 call mtr.add_suppression("The source .* for channel 'ch1_3' has joined the group .*, and so added its entry into replication_asynchronous_connection_failover table.");
-call mtr.add_suppression("The source's UUID has changed, although this should not happen unless you have changed it manually. The old UUID was.*");
 call mtr.add_suppression("The group .* for the channel .* has been removed, and so removed its entry from replication_asynchronous_connection_failover_managed and all the group members from replication_asynchronous_connection_failover table.");
 call mtr.add_suppression("The group .* for the channel .* has been added, and so added its entry in replication_asynchronous_connection_failover_managed and source to replication_asynchronous_connection_failover table.");
 SET SESSION sql_log_bin = 1;

mysql-test/suite/group_replication/r/gr_acf_ps_query_fail.result

@@ -81,7 +81,6 @@ asynchronous_connection_failover_delete_managed('ch1_3', 'GROUP_NAME')
 The UDF asynchronous_connection_failover_delete_managed() executed successfully.
 SET SESSION sql_log_bin = 0;
 call mtr.add_suppression("The source .* for channel 'ch1_3' has joined the group .*, and so added its entry into replication_asynchronous_connection_failover table.");
-call mtr.add_suppression("The source's UUID has changed, although this should not happen unless you have changed it manually.*");
 call mtr.add_suppression("The source .* has lost quorum, and so channel 'ch1_3' connected to it will be stopped.*");
 call mtr.add_suppression("The source .* does not have quorum, and so connection will be killed for channel 'ch1_3'. Check for errors in its error log.");
 call mtr.add_suppression("The source (.*) does not belong to the group majority, .*");

mysql-test/suite/group_replication/r/gr_acf_receiver_add_delete_managed.result

@@ -3,9 +3,6 @@ Warnings:
 Note	####	Sending passwords in plain text without SSL/TLS is extremely insecure.
 Note	####	Storing MySQL user name or password information in the connection metadata repository is not secure and is therefore not recommended. Please consider using the USER and PASSWORD connection options for START REPLICA; see the 'START REPLICA Syntax' in the MySQL Manual for more information.
 [connection server1]
-SET SESSION sql_log_bin = 0;
-call mtr.add_suppression("The source's UUID has changed, although this should not happen unless you have changed it manually. The old UUID was.*");
-SET SESSION sql_log_bin = 1;
 [connection server2]
 [connection server3]
 [connection server4]

mysql-test/suite/group_replication/r/gr_acf_receiver_on_spm.result

@@ -3,9 +3,6 @@ Warnings:
 Note	####	Sending passwords in plain text without SSL/TLS is extremely insecure.
 Note	####	Storing MySQL user name or password information in the connection metadata repository is not secure and is therefore not recommended. Please consider using the USER and PASSWORD connection options for START REPLICA; see the 'START REPLICA Syntax' in the MySQL Manual for more information.
 [connection server1]
-SET SESSION sql_log_bin = 0;
-call mtr.add_suppression("The source's UUID has changed, although this should not happen unless you have changed it manually. The old UUID was.*");
-SET SESSION sql_log_bin = 1;
 [connection server2]
 SET SESSION sql_log_bin = 0;
 call mtr.add_suppression("Can't start replica IO THREAD of channel 'ch1' when group replication is running with single-primary mode on a secondary member.");
@@ -14,7 +11,6 @@ call mtr.add_suppression("Run function 'thread_start' in plugin 'group_replicati
 call mtr.add_suppression("Run function 'applier_start' in plugin 'group_replication' failed");
 call mtr.add_suppression("Failed to run 'thread_start' hook");
 call mtr.add_suppression("Failed to run 'applier_start' hook");
-call mtr.add_suppression("The source's UUID has changed, although this should not happen unless you have changed it manually. The old UUID was.*");
 SET SESSION sql_log_bin = 1;
 
 # 1. Create a replication channel to replicate from server4 to

mysql-test/suite/group_replication/r/gr_acf_receiver_primary_change.result

@@ -3,18 +3,10 @@ Warnings:
 Note	####	Sending passwords in plain text without SSL/TLS is extremely insecure.
 Note	####	Storing MySQL user name or password information in the connection metadata repository is not secure and is therefore not recommended. Please consider using the USER and PASSWORD connection options for START REPLICA; see the 'START REPLICA Syntax' in the MySQL Manual for more information.
 [connection server1]
-SET SESSION sql_log_bin = 0;
-call mtr.add_suppression("The source's UUID has changed, although this should not happen unless you have changed it manually. The old UUID was.*");
-SET SESSION sql_log_bin = 1;
-[connection server2]
-SET SESSION sql_log_bin = 0;
-call mtr.add_suppression("The source's UUID has changed, although this should not happen unless you have changed it manually. The old UUID was.*");
-SET SESSION sql_log_bin = 1;
 
 # 1. Create a replication channel to replicate from server4 to
 #    to server1 on both server1 and 2.
 
-[connection server1]
 CHANGE REPLICATION SOURCE TO SOURCE_HOST='127.0.0.1', SOURCE_USER='root', SOURCE_AUTO_POSITION=1, SOURCE_PORT=SERVER_4_PORT, SOURCE_CONNECT_RETRY=1, SOURCE_RETRY_COUNT=1, SOURCE_CONNECTION_AUTO_FAILOVER=1 FOR CHANNEL 'ch1';
 Warnings:
 Note	1759	Sending passwords in plain text without SSL/TLS is extremely insecure.

mysql-test/suite/group_replication/r/gr_acf_role_changes_weight.result

@@ -12,7 +12,6 @@ include/start_and_bootstrap_group_replication.inc
 include/start_group_replication.inc
 [connection server3]
 SET SESSION sql_log_bin = 0;
-call mtr.add_suppression("The source's UUID has changed, although this should not happen unless you have changed it manually. The old UUID was.*");
 call mtr.add_suppression("The source.*for channel.*has joined the group.*and so added its entry into replication_asynchronous_connection_failover table");
 call mtr.add_suppression("The group .* for the channel .* has been removed, and so removed its entry from replication_asynchronous_connection_failover_managed and all the group members from replication_asynchronous_connection_failover table.");
 call mtr.add_suppression("The group .* for the channel .* has been added, and so added its entry in replication_asynchronous_connection_failover_managed and source to replication_asynchronous_connection_failover table.");

mysql-test/suite/group_replication/r/gr_acf_sender_change_group.result

@@ -64,7 +64,6 @@ include/assert.inc ['There one row in performance_schema.replication_asynchronou
 SET SESSION sql_log_bin = 0;
 call mtr.add_suppression("The source .* for channel 'ch1' has joined the group .*, and so added its entry into replication_asynchronous_connection_failover table.");
 call mtr.add_suppression("The Monitor IO thread detected that the source .* does not belong to the group majority, thence the channel .* will try to connect to another source.");
-call mtr.add_suppression("The source's UUID has changed, although this should not happen unless you have changed it manually. The old UUID was.*");
 call mtr.add_suppression("The source .* for channel 'ch1' has left the group .*, and so removed its entry from replication_asynchronous_connection_failover table.");
 call mtr.add_suppression("The group .* for the channel .* has been removed, and so removed its entry from replication_asynchronous_connection_failover_managed and all the group members from replication_asynchronous_connection_failover table.");
 call mtr.add_suppression("The group .* for the channel .* has been added, and so added its entry in replication_asynchronous_connection_failover_managed and source to replication_asynchronous_connection_failover table.");

mysql-test/suite/group_replication/r/gr_acf_sender_no_majority.result

@@ -95,7 +95,6 @@ include/assert.inc ['There are no rows in performance_schema.replication_asynchr
 include/assert.inc ['There are no rows in performance_schema.replication_asynchronous_connection_failover_managed']
 SET SESSION sql_log_bin = 0;
 call mtr.add_suppression("The source .* for channel 'ch1' has joined the group .*, and so added its entry into replication_asynchronous_connection_failover table.");
-call mtr.add_suppression("The source's UUID has changed, although this should not happen unless you have changed it manually.*");
 call mtr.add_suppression("The Monitor IO thread detected that the source .* does not belong to the group majority, thence the channel .* will try to connect to another source.*");
 call mtr.add_suppression("The IO thread detected that the source .* does not belong to the group majority, thence the channel .* will try to connect to another source.");
 call mtr.add_suppression("The source .* for channel 'ch1' has left the group .*, and so removed its entry from replication_asynchronous_connection_failover table.");

mysql-test/suite/group_replication/r/gr_acf_sender_no_majority_2groups.result

@@ -82,7 +82,6 @@ include/assert.inc ['There are no rows in performance_schema.replication_asynchr
 include/assert.inc ['There are no rows in performance_schema.replication_asynchronous_connection_failover_managed']
 SET SESSION sql_log_bin = 0;
 call mtr.add_suppression("The source .* for channel 'ch1' has joined the group .*, and so added its entry into replication_asynchronous_connection_failover table.");
-call mtr.add_suppression("The source's UUID has changed, although this should not happen unless you have changed it manually.*");
 call mtr.add_suppression("The IO thread detected that the source .* does not belong to the group majority, thence the channel .* will try to connect to another source.");
 call mtr.add_suppression("The Monitor IO thread detected that the source .* does not belong to the group majority, thence the channel .* will try to connect to another source.*");
 call mtr.add_suppression("The Monitor IO thread failed to connect to the source .* for channel 'ch1', thence it will try to connect to another source.");