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Design For Failure Is The Path To Success In CloudAshay Chaudhary
REQUIREMENTSJourney thru the computing models
Evolution of Requirements
• Mainframe• Desktop• Client-Server
• Internet
• Cloud Computing
• Reliability• Availability• Serviceability• Performance
+• Security
+• Agility
AVAILABILITYNon-Cloud Model
Guiding Principles
• Design for Non-Failure• Deploy with Redundancy• Manage Effectively
• Design for Non-Failure• Quality
Hardware
• Deploy with Redundancy• Specialty
Hardware
• Manage Effectively• Expert Staff• Processes
AVAILABILITYCloud Model
Guiding Principles
• Design for Failure• Design for Redundancy• Monitor Extensively• Track Dependencies
Design For Failure
• Assume nothing• Expect failures• Anywhere and everywhere• If it is available now, doesn’t mean it is there later
• Failures cascade• Unhandled failures propagate• Poorly handled failures adds complexity• Difficulty increases exponentially with complexity
• Embrace failure, make it a first class citizen
Handle All Failures
• Unhandled failures is a very bad idea• Poorly handled trivial failure in one part
becomes a critical one somewhere else• Two types of failures: Transient and Resource• Transient failures are difficult, treat them like
Resource failures and fail fast• Delays are transient failures, define response
time guarantees• Failure injection is a lifestyle
Design For Redundancy
• Eliminate single points of failure• Architect distributed applications• Minimize duration of statefulness
Monitor Extensively
• Self assess and report health• Complementary external monitoring• Load and latency monitoring• Proactively restart components
Track Dependencies
• Identify all dependencies• Hardware, 3rd Party Libraries, Other servers, Network• Infrastructure/Platform services, External services• Your own components
• Track their health and availability
Key Takeaways
• If there’s only one thing you could do• Design for Failure
• It is a paradigm shift• It is a cultural change• It is not easy
• It is the key to success in the cloud
Ashay ChaudharyCloud Consultant
Corporate EducationPrivate Cloud SolutionsHighly Scalable SaaS ApplicationsSaaS Business Intelligence & Analytics
ashay@kloudpros.com@ashay_c
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