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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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6
mysql-test/suite/multi_source/skip_counter.result
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@@ -12,7 +12,8 @@ connect slave,127.0.0.1,root,,,$SERVER_MYPORT_3;
change master 'master1' to
master_port=MYPORT_1,
master_host='127.0.0.1',
master_user='root';
master_user='root',
master_use_gtid=no;
start slave 'master1';
set default_master_connection = 'master1';
include/wait_for_slave_to_start.inc
@@ -20,7 +21,8 @@ set default_master_connection = 'master2';
change master 'master2' to
master_port=MYPORT_2,
master_host='127.0.0.1',
master_user='root';
master_user='root',
master_use_gtid=no;
set global sql_slave_skip_counter = 2;
select @@global.sql_slave_skip_counter;
@@global.sql_slave_skip_counter