ITPUB

Jun 27, 2026 · Databases

Why Does Database Master‑Slave Replication Lag Every Day at 5‑7 AM?

The article investigates why master‑slave replication delay spikes each morning between 05:00 and 07:00, tracing it to the inventory‑snapshot worker that floods binlog traffic, evaluates five mitigation strategies, implements a big‑data extraction pipeline to Elasticsearch, and reports that the nightly delay disappeared and disk utilization improved.