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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
Download Patch File Download Diff File Expand all files Collapse all files

9
sql/rpl_mi.cc
View File

@@ -39,12 +39,12 @@ Master_info::Master_info(LEX_CSTRING *connection_name_arg,
clock_diff_with_master(0),
sync_counter(0), heartbeat_period(0), received_heartbeats(0),
master_id(0), prev_master_id(0),
using_gtid(USE_GTID_NO), events_queued_since_last_gtid(0),
using_gtid(USE_GTID_SLAVE_POS), events_queued_since_last_gtid(0),
gtid_reconnect_event_skip_count(0), gtid_event_seen(false),
in_start_all_slaves(0), in_stop_all_slaves(0), in_flush_all_relay_logs(0),
users(0), killed(0),
total_ddl_groups(0), total_non_trans_groups(0), total_trans_groups(0),
is_shutdown(false)
is_shutdown(false), master_supports_gtid(true)
{
char *tmp;
host[0] = 0; user[0] = 0; password[0] = 0;
@@ -211,7 +211,10 @@ void init_master_log_pos(Master_info* mi)
mi->master_log_name[0] = 0;
mi->master_log_pos = BIN_LOG_HEADER_SIZE; // skip magic number
mi->using_gtid= Master_info::USE_GTID_NO;
if (mi->master_supports_gtid)
{
mi->using_gtid= Master_info::USE_GTID_SLAVE_POS;
}
mi->gtid_current_pos.reset();
mi->events_queued_since_last_gtid= 0;
mi->gtid_reconnect_event_skip_count= 0;