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Building Composable Services Noah Kantrowitz
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What? Why? How? Perils? Press Start
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What? World 1-1
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What is a Function?
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f(x, y) = z
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What is Idempotence?
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f(x) = f(f(x))
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What is Composable?
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f(x) g(x) f(g(x))
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req_user(x) user_id(x) user_id(req_user(x))
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post('http://login') get('http://search')
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Why? World 1-2
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Availability
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Scaling
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Testing
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Logistics
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How? World 1-3
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Frameworks Storage Rich Data Discovery Resilience Containers Level Up Select a Skill
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ยต-frameworks
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Flask (Python) Sinatra (Ruby) Express (JavaScript)
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ZeroMQ nanomsg ProtoBufs Cap'nProto
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Data Storage (aka state)
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AP Database
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Cache is the enemy
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Rich Data {id: me, cart: http...}
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Hypermedia APIs
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Service Discovery
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Self-Organization
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DNS nslookup('login')
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ZooKeeper CP Database
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Etcd Serf Consul Archaius
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Resilience
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Timeouts Idempotent Retries
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post('chpw', nonce: 314)
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Any service can be down
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Async Messaging Queues
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AMQP Kafka
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Containers
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Less RAM Less Problems
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LXC Jails Zones Docker/Mesos
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Security Isolation
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Immutable Deployment
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Logical Boundaries
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Perils? World 1-4
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Cascade Failures
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Poor Visibility
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Health & Metrics Central Logging Dashboards
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Complex Deployments
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Minimalist Self-organizing Fault-tolerant
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Thank You
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Noah Kantrowitz @kantrn coderanger.net Questions?