Design For Failure Is The
Path To Success In Cloud
Ashay Chaudhary
REQUIREMENTS
Journey thru the computing models
• Mainframe
• Desktop
• Client-Server
•
•
•
•
Reliability
Availability
Serviceability
Performance
+
• Internet
• Security
+
• Cloud Computing
• Agility
Evolution of Requirements
AVAILABILITY
Non-Cloud Model
• Design for Non-Failure
• Deploy with Redundancy
• Manage Effectively
Guiding Principles
• Design for
Non-Failure
• Quality
Hardware
• Deploy with
Redundancy
• Specialty
Hardware
• Manage
Effectively
• Expert Staff
• Processes
AVAILABILITY
Cloud Model
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•
•
•
Design for Failure
Design for Redundancy
Monitor Extensively
Track Dependencies
Guiding Principles
• 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
Design For Failure
• 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
Handle All Failures
• Eliminate single points of failure
• Architect distributed applications
• Minimize duration of statefulness
Design For Redundancy
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•
•
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Self assess and report health
Complementary external monitoring
Load and latency monitoring
Proactively restart components
Monitor Extensively
• Identify all dependencies
• Hardware, 3rd Party Libraries, Other servers, Network
• Infrastructure/Platform services, External services
• Your own components
• Track their health and availability
Track Dependencies
• 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
Key Takeaways
Ashay Chaudhary
Cloud Consultant
Corporate Education
Private Cloud Solutions
Highly Scalable SaaS Applications
SaaS Business Intelligence & Analytics
ashay@kloudpros.com
@ashay_c