SOA Patterns > Service Implementation Patterns > Redundant Implementation
Redundant Implementation (Erl)
How can the reliability and availability of a service be increased?
Problem
A service that is being actively reused introduces a potential single point of failure that may jeopardize the reliability of all compositions in which it participates if an unexpected error condition occurs.
Solution
Reusable services can be deployed via redundant implementations or with failover support.
Application
The same service implementation is redundantly deployed or supported by infrastructure with redundancy features.
Impacts
Extra governance effort is required to keep all redundant implementations in synch.
Principles
Architecture
Service
Having redundant implementations of agnostic services provides fail-over protection should any one implementation go down.
Related Patterns in This Catalog
Composition Autonomy, Dual Protocols, Entity Abstraction, Inventory Endpoint, Logic Centralization, Multi-Channel Endpoint, Service Data Replication, Utility Abstraction
Related Service-Oriented Computing Goals
This pattern is covered in SOACP Module 7: Advanced SOA Design & Architecture with Services & Microservices.
For more information regarding the SOA Certified Pofessional (SOACP) curriculum,
visit www.arcitura.com/soa.
This page contains excerpts from:
SOA Design Patterns by Thomas Erl
(ISBN: 0136135161, Hardcover, Full-Color, 400+ Illustrations, 865 pages)
For more information about this book, visit www.arcitura.com/books.