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MDEV-19801: Change defaults for CHANGE MASTER TO so that GTID-based replication is used by default if master supports it

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This commit makes replicas crash-safe by default by changing the
Using_Gtid value to be Slave_Pos on a fresh slave start and after
RESET SLAVE is issued. If the primary server does not support GTIDs
(i.e., version < 10), the replica will fall back to Using_Gtid=No on
slave start and after RESET SLAVE.

The following additional informational messages/warnings are added:

 1. When Using_Gtid is automatically changed. That is, if RESET
SLAVE reverts Using_Gtid back to Slave_Pos, or Using_Gtid is
inferred to No from a CHANGE MASTER TO given with log coordinates
without MASTER_USE_GTID.
 2. If options are ignored in CHANGE MASTER TO. If CHANGE MASTER TO
is given with log coordinates, yet also specifies
MASTER_USE_GTID=Slave_Pos, a warning message is given that the log
coordinate options are ignored.

Additionally, an MTR macro has been added for RESET SLAVE,
reset_slave.inc, which provides modes/options for resetting a slave
in log coordinate or gtid modes. When in log coordinates mode, the
macro will execute CHANGE MASTER TO MASTER_USE_GTID=No after the
RESET SLAVE command. When in GTID mode, an extra parameter,
reset_slave_keep_gtid_state, can be set to reset or preserve the
value of gtid_slave_pos.

Reviewed By:
===========
Andrei Elkin <andrei.elkin@mariadb.com>
This commit is contained in:
Brandon Nesterenko
2022-05-23 14:14:00 -06:00
parent 8c2faad576
commit 5ab5ff08b0
167 changed files with 1404 additions and 344 deletions
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21
mysql-test/suite/multi_source/mdev-8874.result
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@@ -24,9 +24,9 @@ insert into t1 values(1);
create table t2(a int);
insert into t2 values(1);
connection server_4;
change master 'm1' to master_port=MYPORT_1 , master_host='127.0.0.1', master_user='root';
change master 'm2' to master_port=MYPORT_2 , master_host='127.0.0.1', master_user='root';
change master to master_port=MYPORT_3 , master_host='127.0.0.1', master_user='root';
change master 'm1' to master_port=MYPORT_1 , master_host='127.0.0.1', master_user='root', master_use_gtid=no;
change master 'm2' to master_port=MYPORT_2 , master_host='127.0.0.1', master_user='root', master_use_gtid=no;
change master to master_port=MYPORT_3 , master_host='127.0.0.1', master_user='root', master_use_gtid=no;
start all slaves;
set default_master_connection = 'm1';
include/wait_for_slave_to_start.inc
@@ -65,14 +65,20 @@ Note 1938 SLAVE 'm2' stopped
Note 1938 SLAVE '' stopped
Note 1938 SLAVE 'm1' stopped
RESET SLAVE 'm1' ALL ;
Warnings:
Note 4190 RESET SLAVE is implicitly changing the value of 'Using_Gtid' from 'No' to 'Slave_Pos'
RESET SLAVE 'm2' ALL ;
Warnings:
Note 4190 RESET SLAVE is implicitly changing the value of 'Using_Gtid' from 'No' to 'Slave_Pos'
RESET SLAVE ALL ;
Warnings:
Note 4190 RESET SLAVE is implicitly changing the value of 'Using_Gtid' from 'No' to 'Slave_Pos'
drop database a;
drop database b;
drop database c;
change master 'm1' to master_port=MYPORT_1 , master_host='127.0.0.1', master_user='root';
change master 'm2' to master_port=MYPORT_2 , master_host='127.0.0.1', master_user='root';
change master to master_port=MYPORT_3 , master_host='127.0.0.1', master_user='root';
change master 'm1' to master_port=MYPORT_1 , master_host='127.0.0.1', master_user='root', master_use_gtid=no;
change master 'm2' to master_port=MYPORT_2 , master_host='127.0.0.1', master_user='root', master_use_gtid=no;
change master to master_port=MYPORT_3 , master_host='127.0.0.1', master_user='root', master_use_gtid=no;
start all slaves;
Warnings:
Note 1937 SLAVE 'm2' started
@@ -124,3 +130,6 @@ SET default_master_connection = "m2";
include/wait_for_slave_to_stop.inc
SET default_master_connection = "";
include/wait_for_slave_to_stop.inc
RESET SLAVE ALL;
Warnings:
Note 4190 RESET SLAVE is implicitly changing the value of 'Using_Gtid' from 'No' to 'Slave_Pos'