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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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4
mysql-test/suite/rpl/t/rpl_log_pos.test
View File

@@ -26,7 +26,7 @@ source include/stop_slave.inc;
let $wrong_log_pos= `SELECT $read_pos+2`;
--replace_result $wrong_log_pos MASTER_LOG_POS
eval change master to master_log_pos=$wrong_log_pos;
eval change master to master_log_pos=$wrong_log_pos, master_use_gtid=no;
start slave;
let $slave_io_errno= 1236;
--let $show_slave_io_error= 1
@@ -45,7 +45,7 @@ insert into t1 values (1),(2),(3);
save_master_pos;
connection slave;
--replace_result 4 MASTER_LOG_POS
change master to master_log_pos=4;
change master to master_log_pos=4, master_use_gtid=no;
start slave;
sync_with_master;
select * from t1 ORDER BY n;