Failover and Split-Brain

This generated surface maps a learner-facing curriculum unit to its canonical source routes.

Curriculum surface

• Open learner-facing unit
• Curriculum path: content/curriculum/architecture/semester-06-databases-distributed/module-03-replication-partitioning/concepts/cluster-05-practical-systems/15-managing-failover-and-split-brain-scenarios-primary.md
• App: architecture
• Semester: semester-06-databases-distributed
• Module: module-03-replication-partitioning
• Unit kind: concept
• Curation level: module_curated

Learning objectives

• Explain Failover and Split-Brain in terms of topology, failure handling, and scaling tradeoffs instead of feature lists.
• Use Failover and Split-Brain to predict what breaks or changes when data is copied, partitioned, or rebalanced across nodes.
• Use database-internals, ddia to connect the learner page to lag, routing, quorums, hotspots, and operational reality.

Prerequisites

• Comfort with storage-engine basics, indexing, and single-node database tradeoffs from the earlier modules.

Source books

• database-internals
• ddia

Source routes

Database Internals

• /books/database-internals/chapter-09-failure-detection via Database Internals: Phi-accrual failure detector
• /books/database-internals/chapter-10-leader-election via Database Internals: Chapter 10 Leader election

Ddia

• /books/ddia/chapter-08-the-trouble-with-distributed-systems via DDIA: Process pauses (part 1), DDIA: The truth is defined by the majority
• /books/ddia/chapter-09-consistency-and-consensus via DDIA: Implementing linearizable systems, DDIA: Membership and coordination services

Supporting curriculum routes

No supporting curriculum routes linked yet.

External enrichment

• PostgreSQL Documentation: Replication (official_docs_companion) - Useful when the learner needs an implementation-backed view of leader/follower replication and lag-related tradeoffs.
• Jepsen Analyses (optional_deep_dive) - Provides concrete failure stories that sharpen the learner’s understanding of replication and partitioning tradeoffs.

AI companion modes

• Explain simply
• Socratic tutor
• Challenge my understanding
• Diagnose my confusion
• Connect forward / backward

Source-of-truth note

This teaching unit is learner-facing guidance assembled from multiple canonical book routes. Use the listed source books as the primary conceptual spine for Failover and Split-Brain, and treat outside material as supporting enrichment only.