Failover

Kind: mechanism

Layer: Correctness Core

Record: architecture:failover

Severity: contextual

Scope: service, infrastructure, data

Canonical: Ontology

A mechanism that switches traffic or reads to a standby instance when the active one fails.

Listed in Architecture principles, after Health Checks and before Redundancy.

Requires

• Redundancy
• Health Detection

Reinforces

• Availability

Enables

• Continuity During Failure

Conflicts with

• Single Instance Dependency

In tension with

• Consistency

Tensions

• Failover / Consistency

Violated by

• Single Instance Dependency

Refactored by

• Read Replica

Severity

• contextual

Category

• Self-Healing / Recovery / Deployment Safety

Enabled by

• Service Discovery
• Replication

Refactors

• Fault Tolerance

Linked from

• Runtime Discovery / Dynamic Binding
• Error Handling / Resilience
• Self-Healing / Recovery / Deployment Safety
• Transactions / State / Concurrency
• Quality Attributes
• Self-Healing / Recovery / Deployment Safety
• Severity levels
• The resolutions