GTID_EVENT
For global transaction ID, used to start a new transaction event group, instead of the old BEGIN query event, and also to mark stand-alone (ddl).
GTID_EVENT, event type is 162 (0xa2)
Event Header
- Type[1] = 0xa2
- Flags[2] = 08 00 => LOG_EVENT_SUPPRESS_USE_F
Fields
if flag & FL_GROUP_COMMIT_ID
- uint<8> commit_id
else if flag & (FL_PREPARED_XA | FL_COMPLETED_XA)
- uint<4> format_id
- uint<1> gtid_length
- uint<1> bqual_length
- byte<n>xid, where n is sum of gtrid and bqual lengths
else
- uint<6> 0
Flags
| FL_STANDALONE | 1 | Set when there is no terminating COMMIT event. |
| FL_GROUP_COMMIT_ID | 2 | Set when event group is part of a group commit on the master. Groups with same commit_id are part of the same group commit. |
| FL_TRANSACTIONAL | 4 | Set for an event group that can be safely rolled back (no MyISAM, eg.). |
| FL_ALLOW_PARALLEL | 8 | Reflects the (negation of the) value of @@SESSION.skip_parallel_replication at the time of commit. |
| FL_WAITED | 16 | Set if a row lock wait (or other wait) is detected during the execution of the transaction. |
| FL_DDL | 32 | Set for event group containing DDL. |
| FL_PREPARED_XA | 64 | Set for XA transaction. |
| FL_COMPLETED_XA | 128 | XA transaction completed (committed or rolled back) |
Transaction Example from mysqlbinlog Utility
BEGIN #171205 18:22:52 server id 10124 end_log_pos 652 CRC32 0x23c8d337 GTID 0-10124-9884 trans TBALE_MAP #171205 18:22:52 server id 10124 end_log_pos 752 CRC32 0x52601513 Table_map: `test`.`t4` mapped to number 92 WRITE #171205 18:22:52 server id 10124 end_log_pos 790 CRC32 0x8869c123 Write_rows: table id 92 flags: STMT_END_F COMMIT #171205 18:22:52 server id 10124 end_log_pos 821 CRC32 0x15517636 Xid = 42004
Standalone Event DDL (FLUSH TABLES) from mysqlbinlog Utility
#171205 17:44:27 server id 10124 end_log_pos 535 CRC32 0x309a668e GTID 0-10124-9883 ddl #171205 17:44:27 server id 10124 end_log_pos 610 CRC32 0xda151470 Query thread_id=819 ...
Example GTID_EVENT with DDL and CRC32
eb cc 26 5a a2 8c 27 00 00 2a 00 00 00 17 02 00 ...&Z..'..*..... 00 08 00 9b 26 00 00 00 00 00 00 00 00 00 00 29 ...&..........). 00 00 00 00 00 00 8e 66 9a 30 ......f.0.
Content
- GTID seq[8] = 9b 26 00 00 00 00 00 00 => 9883
- domain id[4] = 00 00 00 00 00 => 0
- flags[1] = 29 => 41 (FL_DDL =32 + FL_ALLOW_PARALLEL=8 + FL_STANDALONE=1)
- commit_id[6] = 00 00 00 00 00 00 = 0
- CRC32[4] = 8e 66 9a 30
Example GTID_EVENT With a Transaction and CRC32
ec d5 26 5a a2 8c 27 00 00 2a 00 00 00 8c 02 00 ..&Z..'..*...... 00 08 00 9c 26 00 00 00 00 00 00 00 00 00 00 0c ....&........... 00 00 00 00 00 00 37 d3 c8 23 ......7..#
Content
- GTID seq[8] = 9c 26 00 00 00 00 00 00 => 9884
- domain id[4] = 00 00 00 00 00 => 0
- flags[1] = 0c => 12 (FL_ALLOW_PARALLEL=8 + FL_TRANSACTIONAL=4)
- commit_id[6] = 00 00 00 00 00 00 = 0
- CRC32[4] = 37 d3 c8 23
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