Overview and best practices of multithreaded replication in Amazon RDS for MySQL, Amazon RDS for MariaDB, and Amazon Aurora MySQL

This article provides a comprehensive overview of Multithreaded Replication (MTR) in Amazon RDS for MySQL, MariaDB, and Amazon Aurora MySQL, focusing on its architecture, configuration, and best practices.

• MTR enhances binlog replication performance by using multiple worker threads to apply transactions in parallel
• Two primary dependency tracking methods are used: COMMIT ORDER and WRITESET
• Key configuration parameters include:
  • binlog_transaction_dependency_tracking (recommended: WRITESET)
  • replica_parallel_workers (default: 4 in newer versions)
  • replica_preserve_commit_order (ensures transaction order consistency)
• Recommended best practices:
  • Use tables with primary or unique keys
  • Avoid large transactions
  • Monitor and tune worker thread settings

The article emphasizes the importance of carefully configuring MTR to optimize replication performance while maintaining data consistency across source and replica databases.