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Distributed Systems: Theory and Practice
Volodymyr Kovalenko
www.luxoft.com
Expected content
‣ Microservice architecture examples
‣ Main principles and theory worth remembering
‣ Lots of pictures
www.luxoft.com
Expected result
‣ Revise highlevel picture and main topics
‣ Find out few insights and ideas
‣ Provide directions for further self-learning
www.luxoft.com
About Me
‣ Doing Egineering for 8 years
‣ Technical Lead at Luxoft
‣ Part-time Java consultant
‣ Co-Founder at MakeMeBest
‣ Enjoy running
facebook.com/templatevk
t.me/templatevk
www.luxoft.com
Definition of a Distributed System
A distributed system is a system whose components are located on different
networked computers, which communicate and coordinate their actions by passing
messages to one another (c) Wikipedia
www.luxoft.com
www.luxoft.com
Main characteristics
‣ Resource Sharing - hardware, software, data
‣ Concurrency - reduce latency, increase throughput
‣ Openness - standard interfaces
‣ Scalability - horizontal
‣ Fault Tolerance - everything can fail
‣ Visibility / Transparency - high-level view, detailed analytics
www.luxoft.com
www.luxoft.com
Pinterest Architecture - 35M DAU
www.luxoft.com
Netflix Architecture - 33M DAU
www.luxoft.com
Uber Architecture - 30M DAU
www.luxoft.com
www.luxoft.com
www.luxoft.com
Typical Components
‣ API Gateway
‣ Messaging / Streaming
‣ Data Storage
‣ Analytics
‣ Presentation
www.luxoft.com
API Gateway
‣ Load Balancing / Routing
‣ Security
‣ Logging / Metrics
‣ Throttling / Rate Limiting
‣ Canary Release
‣ Blue Green Deployment
www.luxoft.com
Messaging / Transport
‣ Asynchronous / Synchronous
‣ Reliable / Unreliable
‣ Request-Response / Streaming
‣ OSI level 3-7
www.luxoft.com
Data Storage
‣ RDBMS - ACID
‣ NoSQL - BASE
‣ Data Warehouse
‣ HDFS
‣ Consensus / External Config
www.luxoft.com
‣ Distributed Tracing
‣ Performance Monitoring
‣ System / Business Metrics
Analytics
www.luxoft.com
Presentation
www.luxoft.com
Is the system CAPable?
‣ Consistency - a read is guaranteed to return the most recent write
‣ Availability - a non-failing node will return a reasonable response within a
reasonable amount of time (no error or timeout).
‣ Partition Tolerance - the system will continue to function when network partitions
occur.
CP / AP/ CA
www.luxoft.com
Scalability
‣ Vertical / Horizontal
‣ Metrics-based
‣ Decomposition
‣ Manual / Auto
www.luxoft.com
www.luxoft.com
Scalability - Application Design
‣ Partition the workload
‣ Design for scaling
‣ Scale as a unit
‣ Avoid client affinity
‣ Offload intensive CPU/IO tasks & distribute the workload
‣ Send requests in batches to optimize network use
‣ Use asynchronous calls
www.luxoft.com
Scalability - Data Management
‣ Use data partitioning
‣ Design for eventual consistency
‣ Use queues to level the load for high velocity data writes
‣ Aggressively use caching
‣ Handle data growth and retention
‣ Consider denormalizing data
www.luxoft.com
Fault tolerance
‣ Healthchecks
‣ Timeouts
‣ Retries
‣ Circuit Breaker
‣ Rate Limiting
‣ Bulkhead
‣ Chaos Engineering
www.luxoft.com
www.luxoft.com
Visibility
‣ Collect Metrics
‣ Alerts / Duty
‣ Centralized Logging
‣ Exception Management
‣ Distributed Tracing
‣ Performance Monitoring
www.luxoft.com
www.luxoft.com
What's the Global Trend?
www.luxoft.com
Thank You!

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