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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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58
mysql-test/include/reset_slave.inc Normal file
View File

@@ -0,0 +1,58 @@
# ==== Purpose ====
#
# Reset the slave on the active connection
#
#
# ==== Usage ====
#
# [--let $master_use_gtid_option= NO]
# --source include/rpl_reset_slave.inc
#
# Parameters:
# $master_use_gtid_option
# Sets the context for the reset slave. When No, execute
# CHANGE MASTER TO MASTER_USE_GTID=No after the RESET SLAVE. When
# Slave_Pos, execute set gtid_slave_pos= "" after RESET SLAVE.
#
# $reset_slave_keep_gtid_state
# When master_use_gtid_option is Slave_Pos, this defines whether or not
# gtid_slave_pos will be reset as well. Accepted values are of boolean
# type. Default value is false.
#
--let $include_filename= reset_slave.inc
--source include/begin_include_file.inc
if (!$rpl_debug)
{
--disable_query_log
}
if (!$master_use_gtid_option)
{
--let $master_use_gtid_option= Slave_Pos
}
if (!$reset_slave_keep_gtid_state)
{
--let $reset_slave_keep_gtid_state=0
}
if (`SELECT strcmp("$master_use_gtid_option","Slave_Pos") != 0 AND strcmp("$master_use_gtid_option","No") != 0`)
{
die Invalid option provided as master_use_gtid_option, Slave_Pos or No are the only allowed options;
}
RESET SLAVE;
if (`SELECT strcmp("$master_use_gtid_option","Slave_Pos") = 0 AND NOT $reset_slave_keep_gtid_state`)
{
SET @@GLOBAL.gtid_slave_pos= "";
}
if (`SELECT strcmp("$master_use_gtid_option","No") = 0`)
{
CHANGE MASTER TO MASTER_USE_GTID=No;
}
--let $include_filename= reset_slave.inc
--source include/end_include_file.inc