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Nov 10, 2021 · Databases

Investigating Data Loss with gh-ost in MySQL AFTER_SYNC Semi‑Sync Replication and Applying a Fix

This article documents a reproducible test that shows gh-ost can lose rows when used on a MySQL 5.7 AFTER_SYNC semi‑synchronous replica, explains the underlying cause, and presents a source‑code modification that prevents the loss.