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System Design for SDE-2 and above: https://arpitbhayani.me/masterclass System Design for Beginners: https://arpitbhayani.me/sys-design Redis Internals: https://arpitbhayani.me/redis Build Your Own Redis / DNS / BitTorrent / SQLite - with CodeCrafters. Sign up and get 40% off - https://app.codecrafters.io/join?via=... In this video, I explained how Shopify rebalances data shards in its MySQL database without downtime. A scalable system must handle excessive load by moving data between shards. Shopify's tool, Ghostferry, performs batch copying and tailing bin logs to ensure data integrity during migration. Factors like historical utilization and traffic help decide shard allocation. The process involves automating data movement, ensuring availability, preventing data loss, and optimizing performance. The phased approach includes batch copying, capturing live events, and updating routing tables to achieve seamless data migration. Recommended videos and playlists If you liked this video, you will find the following videos and playlists helpful System Design:    • PostgreSQL connection management and ...   Designing Microservices:    • Advantages of adopting a microservice...   Database Engineering:    • How nested loop, hash, and merge join...   Concurrency In-depth:    • How to write efficient and fair multi...   Research paper dissections:    • The Google File System - Paper Explained   Outage Dissections:    • Dissecting GitHub Outage and things t...   Hash Table Internals:    • Internal Structure of a Hash Table   Bittorrent Internals:    • Introduction to BitTorrent and the pr...   Things you will find amusing Knowledge Base: https://arpitbhayani.me/knowledge-base Bookshelf: https://arpitbhayani.me/bookshelf Papershelf: https://arpitbhayani.me/papershelf Other socials I keep writing and sharing my practical experience and learnings every day, so if you resonate then follow along. I keep it no fluff. LinkedIn:   / arpitbhayani   Twitter:   / arpit_bhayani   Weekly Newsletter: https://arpit.substack.com Thank you for watching and supporting! it means a ton. I am on a mission to bring out the best engineering stories from around the world and make you all fall in love with engineering. If you resonate with this then follow along, I always keep it no-fluff.