JD Tech Talk
Oct 22, 2026 · Databases
Database High Availability: 5-Layer Architecture from WAL to Automated Failover
This article details a five-layer database high availability architecture: single-node crash recovery via WAL and two-phase commit, asynchronous and semi-synchronous replication trade-offs, GTID-based global transaction identification for seamless failover, fencing mechanisms to prevent split-brain, and Orchestrator with probe-agent for automated failure detection and failover execution.
Crash RecoveryFailoverFencing
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