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001 Ai Topological Sort

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TLDR: MySQL Replication Internals

Date: 2026-01-16 Source: https://arpitbhayani.me/blogs/mysql-replication-internals

Overview

MySQL replication enables data synchronization across databases, powering read scaling and even some complex distributed architectures. At the core lies the binary log (binlog), which is the authoritative record of all data modifications on a source server.

Key Points

  • MySQL replication enables data synchronization across databases, powering read scaling and even some complex distributed architectures.
  • Why Binlog Replication Matters: MySQL’s binary log keeps a record of every change to the database, essentially serving as the source of truth for what happened and when.
  • Binary Log: The binary log is a sequence of files that record changes to the database.
  • Binary Log Event Structure: Every change recorded in the binary log is stored as an event.
  • MySQL uses several event types, but some important ones are … is the first event in every binary log file.
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Common Event Types:
  • Binary Log Formats: MySQL supports three binary logging formats, each with different tradeoffs for space efficiency, safety, and compatibility.

    • Takeaway

    MySQL binlog replication has a pull-based architecture where replicas request events from sources, storing them in relay logs before applying.