Tag
Replication Internals
2 articles tagged with "Replication Internals"
MySQL
Marcelo Altmann
Replication Internals: Decoding the MySQL Binary Log Part 11: GTID_TAGGED_LOG_EVENT — Tagged GTIDs and MySQL's New Serialization Framework
In this eleventh and final post of our series, we decode the GTID_TAGGED_LOG_EVENT — the event MySQL 8.4 introduced to carry user-defined tags alongside the classic UUID and GNO, and along the way meet the new mysql::serialization framework that encodes it. Introduction Back in Part 5 we deferred one event: the GTID_TAGGED_LOG_EVENT (event type 42, 0x2a). It was introduced in MySQL 8.4 to support tagged GTIDs, which extend the classic UUID:GNO form with an optional user-defined label: 557789
Marcelo Altmann2026-05-13·21 min read
MySQLMarcelo Altmann
Replication Internals: Decoding the MySQL Binary Log Part 10: ROTATE_EVENT — Closing the File and Pointing at the Next One
In this tenth post of our series, we decode the ROTATE_EVENT — the event that closes a binary log file and tells every reader, replica or local, where to look next. Introduction The ROTATE_EVENT (event type 4, 0x04) is the bookmark MySQL leaves at the end of a binary log file. It carries two pieces of information: * The name of the binary log file to read next. * The starting position within that next file (always 4, the byte right after the 4-byte magic number from Part 2). Together thos
Marcelo Altmann2026-05-06·10 min read
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