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| author | Brandon Nesterenko <brandon.nesterenko@mariadb.com> | 2022-05-23 14:14:00 -0600 |
|---|---|---|
| committer | Brandon Nesterenko <brandon.nesterenko@mariadb.com> | 2022-07-26 13:31:27 -0600 |
| commit | 5ab5ff08b008417f32dd4bb15820a1a53ea3821c (patch) | |
| tree | 065fb608faf7067e7efb40e5d2ef1f74d9d7a17e /sql/rpl_mi.h | |
| parent | 8c2faad576d6a77314e92755a389de2c41e21242 (diff) | |
| download | mariadb-git-5ab5ff08b008417f32dd4bb15820a1a53ea3821c.tar.gz | |
MDEV-19801: Change defaults for CHANGE MASTER TO so that GTID-based replication is used by default if master supports it
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>
Diffstat (limited to 'sql/rpl_mi.h')
| -rw-r--r-- | sql/rpl_mi.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/sql/rpl_mi.h b/sql/rpl_mi.h index b8135b8b55f..fa3327873c4 100644 --- a/sql/rpl_mi.h +++ b/sql/rpl_mi.h @@ -361,6 +361,13 @@ class Master_info : public Slave_reporting_capability at time its alter info struct is about to be appened to the list. */ bool is_shutdown; + + /* + A replica will default to Slave_Pos for using Using_Gtid; however, we + first need to test if the master supports GTIDs. If not, fall back to 'No'. + Cache the value so future RESET SLAVE commands don't revert to Slave_Pos. + */ + bool master_supports_gtid; }; struct start_alter_thd_args |