Nelson: Functional programming in system design (SBTB 2018)

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Nelson Functional programming in system design Adelbert Chang @adelbertchang Lead Data Engineer @ Target Distinguished YAML

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https://youtu.be/t8KRo-DXnEo

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Why are people scared of deployments?

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Why are people scared of deployments? Deployments are often manual, happen infrequently, and have cascading eﬀects.

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B 5.4.5 D 2.1.8 F 1.2.3 G 1.0.9 C 2.3.6 A 1.1.5 Mutable deployments E 4.12.7

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B 5.4.5 D 2.1.8 F 1.2.3 G 1.0.9 C 2.3.6 A 1.1.5 Mutable deployments E 4.12.7 D 2.2.0

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B 5.4.5 D 2.2.0 F 1.2.3 G 1.0.9 C 2.3.6 A 1.1.5 Mutable deployments E 4.12.7

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B 5.4.5 D 2.2.0 F 1.2.3 G 1.0.9 C 2.3.6 A 1.1.5 Mutable deployments E 4.12.7

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F 1.2.3 G 1.0.9 C 2.3.6 Immutable deployments A 1.1.5 E 4.12.7 D 2.1.8 B 5.4.5

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F 1.2.3 G 1.0.9 C 2.3.6 Immutable deployments A 1.1.5 E 4.12.7 D 2.1.8 B 5.4.5 D 2.2.0

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F 1.2.3 G 1.0.9 C 2.3.6 Immutable deployments A 1.1.5 E 4.12.7 D 2.1.8 B 5.4.5 D 2.2.0

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F 1.2.3 G 1.0.9 C 2.3.6 Immutable deployments A 1.1.5 E 4.12.7 D 2.1.8 B 5.4.5 D 2.2.0 E 4.12.8

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F 1.2.3 G 1.0.9 C 2.3.6 Immutable deployments A 1.1.5 D 2.1.8 B 5.4.5 D 2.2.0 E 4.12.8

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F 1.2.3 G 1.0.9 C 2.3.6 Immutable deployments A 1.1.5 D 2.1.8 B 5.4.5 D 2.2.0 E 4.12.8 B 5.4.6

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F 1.2.3 G 1.0.9 C 2.3.6 Immutable deployments A 1.1.5 D 2.1.8 B 5.4.5 D 2.2.0 E 4.12.8 B 5.4.6 A 1.1.6

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F 1.2.3 G 1.0.9 C 2.3.6 Immutable deployments D 2.1.8 B 5.4.5 D 2.2.0 E 4.12.8 B 5.4.6 A 1.1.6

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F 1.2.3 G 1.0.9 C 2.3.6 Immutable deployments D 2.1.8 D 2.2.0 E 4.12.8 B 5.4.6 A 1.1.6

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F 1.2.3 G 1.0.9 C 2.3.6 Immutable deployments D 2.2.0 E 4.12.8 B 5.4.6 A 1.1.6

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Reify the call graph B 5.4.5 D 2.1.8 F 1.2.3 G 1.0.9 C 2.3.6 A 1.1.5 E 4.12.7

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Reify the call graph B 5.4.5 D 2.1.8 F 1.2.3 G 1.0.9 C 2.3.6 A 1.1.5 E 4.12.7

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Nelson: User's perspective

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.nelson.yml (checked-in) Nelson: User's perspective

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.nelson.yml (checked-in) Nelson: User's perspective What to deploy (logical)

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.nelson.yml (checked-in) Nelson: User's perspective What to deploy (logical) How to deploy

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.nelson.yml (checked-in) Nelson: User's perspective What to deploy (logical) How to deploy Where to deploy

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.nelson.yml (checked-in) Nelson: User's perspective What to deploy (logical) How to deploy foo.deployable.yml (per-deploy) Where to deploy

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.nelson.yml (checked-in) Nelson: User's perspective What to deploy (logical) How to deploy What to deploy (physical) foo.deployable.yml (per-deploy) Where to deploy

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Nelson: User's perspective Cloud image taken from https://en.wikipedia.org/wiki/File:Cartoon_cloud.svg

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Nelson: User's perspective 1. Make a deployment Cloud image taken from https://en.wikipedia.org/wiki/File:Cartoon_cloud.svg

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Nelson: User's perspective 1. Make a deployment Cloud image taken from https://en.wikipedia.org/wiki/File:Cartoon_cloud.svg 2. Webhook calls Nelson

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Nelson: User's perspective 1. Make a deployment Cloud image taken from https://en.wikipedia.org/wiki/File:Cartoon_cloud.svg 2. Webhook calls Nelson 3. Nelson fetches + parses manifest

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Nelson: User's perspective 1. Make a deployment Cloud image taken from https://en.wikipedia.org/wiki/File:Cartoon_cloud.svg 2. Webhook calls Nelson 3. Nelson fetches + parses manifest 4. Nelson deploys to scheduler + enters deployment into graph

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Nelson: User's perspective - CLI

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Nelson: User's perspective - CLI

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Nelson: User's perspective - CLI

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Nelson: User's perspective - CLI

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Nelson: Operator's perspective

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Nelson: Operator's perspective

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Nelson: Operator's perspective 1. Nelson receives + parses manifests

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Nelson: Operator's perspective 1. Nelson receives + parses manifests 2. Dynamically provision credentials

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Nelson: Operator's perspective 1. Nelson receives + parses manifests 2. Dynamically provision credentials 3. Write service discovery information

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Nelson: Operator's perspective 1. Nelson receives + parses manifests 2. Dynamically provision credentials 3. Write service discovery information 4. Deploy

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Nelson: Blueprints

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Nelson: Blueprints

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Nelson: Blueprints

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Nelson: Blueprints Manifest contains blueprint

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Nelson workﬂow

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Nelson workﬂow 1. Make a deployment

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Nelson workﬂow 1. Make a deployment 2. Webhook calls Nelson

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Nelson workﬂow 1. Make a deployment 2. Webhook calls Nelson 3. Nelson fetches + parses manifest

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Nelson workﬂow 1. Make a deployment 2. Webhook calls Nelson 3. Nelson fetches + parses manifest 4. Dynamically provision credentials

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Nelson workﬂow 1. Make a deployment 2. Webhook calls Nelson 3. Nelson fetches + parses manifest 4. Dynamically provision credentials 5. Write service discovery information

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Nelson workﬂow 1. Make a deployment 2. Webhook calls Nelson 3. Nelson fetches + parses manifest 4. Dynamically provision credentials 5. Write service discovery information 6. Deploy

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Nelson workﬂow 1. Make a deployment 2. Webhook calls Nelson 3. Nelson fetches + parses manifest 4. Dynamically provision credentials 5. Write service discovery information 6. Deploy In the background: • User uses Nelson CLI and other tools to interact with deployment • Traﬃc shifting, health checks, cleanup ...

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Nelson: Roadmap • Kubernetes backend: no one-size-fits-all answer for service-to-service right now • Labeled services? Envoy sidecar? Istio? • Test deployments off of branches or pull requests • Actual protocols: Protocol Buffers and gRPC API • Nelson UI • "Getting Started" improvements

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https://getnelson.io/

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https://getnelson.io/ https://github.com/getnelson/ https://gitter.im/getnelson/nelson Find me for Nelson stickers! Questions? Tim Perrett and I are around today and tomorrow!