Published on March 11, 2014
Ivan Zoratti GTIDs Explained MySQL 5.6, MariaDB 10, Galera 3 V1403.01
MySQL 5.6 Replication 2 M1 S1 S2 S3
GTID in MySQL 5.6 3 3E11FA47-71CA-11E1-9E33-C80AA9429562:23 Transaction ID Sequence number determined by the order in which the transaction was committed on this server ! Transaction ID = = Sequence Source ID Identifies the originating server ! Source ID = = Server UUID
GTID in MySQL 5.6 •Used to identify a transaction in a MySQL 5.6 Cluster •Sets are also allowed to identify an interval of transactions •Preserved between masters and slaves, i.e. they identify the source (origin) of a transaction •Transactions with the same GTID cannot be applied more than once •Benefits •Simplified failover (with CHANGE MASTER TO and MASTER_AUTO_POSITION=1) •Guarantees slave consistency by checking Executed_Gtid_Set 4
Galera Cluster • Read & Write access to any node • Client can connect to any node • There can be several nodes • Automatic node provisioning • Replication is synchronous 5
GTID in Galera 3 •Used to identify a state change •i.e. to identify write operations to the database •Used to identify the state itself •i.e. the last state change 6
GTID in Galera 3 7 ! 45eec521-2f34-11e0-0800-2a36050b826b:94530586304 An ordinal sequence number (seqno, 64-‐bit signed integer) to denote the position of the change in the sequence ! Sequence = = Change in the Cluster State UUID I uniquely identifies the state and the sequence of changes it undergoes ! UUID = = Cluster ID
GTID in Galera 3 •A Galera Cluster acts as a single node •No holes in the sequence •Stored in grastate.dat •5ee99582-‐bb8d-‐11e2-‐b8e3-‐23de375c1d30:8204503945773 <<< Typical sequence •5ee99582-‐bb8d-‐11e2-‐b8e3-‐23de375c1d30:-‐1 <<< The node has crashed •00000000-‐0000-‐0000-‐0000-‐000000000000:-‐1 <<< The node has crashed during the execution of a non transactional operations (e.g. a DDL op) or the op has been aborted 8
MariaDB 10 Replication 9
GTID in MariaDB 10 10 ! #131109 14:59:59 server id 1 end_log_pos 4151 GTID XXX-YYY-ZZZ /*!100001 SET @@session.gtid_seq_no=ZZZ*//*!*/; Sequence Number 64bit unsigned It increases monotonically at each commit It is applied for each Event Group, i.e., for each BEGIN/COMMIT or for groups that have no BEGIN/COMMIT (for example DDL commands, TRUNCATE and others) Server ID 32bit unsigned The server_id value for the MariaDB instance Domain ID 32bit unsigned The domain_id value for the Replication stream
GTID in MariaDB 10 •1 GTID for each event group •Groups can be executed in parallel •Transaction safe (stored in an InnoDB table, not in a file) •MASTER_USE_GTID=gtid_slave_pos -‐ great to position/reposition slave nodes •Domain ID is used to guarantee that this works with multi-‐source replication 11
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