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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.
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