Replication

Kind: mechanism

Layer: Correctness Core

Record: architecture:replication

Severity: contextual

Scope: database, service, cache

Canonical: Ontology

A mechanism that keeps copies of data on several nodes under a declared consistency policy, such as a write quorum.

Listed in Architecture principles, after Redundancy and before Auto-Scaling.

Requires

• Consistency Policy

Reinforces

• Scalability
• Availability

Enables

• Read Scaling
• Failover

Conflicts with

• Single Copy State

In tension with

• Consistency Lag

Tensions

• Replication / Consistency Lag

Violated by

• Single Copy State

Refactored by

• Read Replica
• Consistency Contract

Severity

• contextual

Category

• Self-Healing / Recovery / Deployment Safety

Linked from

• Scalability / Performance / Optimization
• Self-Healing / Recovery / Deployment Safety
• Quality Attributes
• Self-Healing / Recovery / Deployment Safety
• Transactions / State / Concurrency
• Severity levels
• The resolutions