Microservice architecture, a programming languages perspective

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Microservice architecture A programming languages perspective Adelbert Chang @adelbertchang AI Engineer @ Target

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Monolithic architecture

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Microservice architecture

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val average : float -> float -> float

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val average : float -> float -> float average "hello" "curryon"

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val average : float -> float -> float average "hello" "curryon" Error: This expression has type string but an expression was expected of type float

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Give me a JSON object with a "name" ﬁeld.

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Give me a JSON object with a "name" ﬁeld. { "name": "Adelbert" }

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Give me a JSON object with a "name" ﬁeld. { "name": "Adelbert" }

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{ "name": "Heather" }

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{ "name": "Heather" } "missing field `age`", line: 1, column: 20

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{ "name": "Heather" } "missing field `age`", line: 1, column: 20

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Deployment service

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Deployment service

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Deployment service

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Deployment service

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Deployment service

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Deployment service

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Deployment service

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Deployment service

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What we need

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What we need

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What we need Language runtime Deployment service

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What we need Language runtime Deployment service Creating an object Deploying a service

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What we need Language runtime Deployment service Creating an object Deploying a service Reference tracking Service dependencies

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What we need Language runtime Deployment service Creating an object Deploying a service Reference tracking Service dependencies Garbage collection Deprecating legacy services

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What we need Language runtime Deployment service Creating an object Deploying a service Reference tracking Service dependencies Garbage collection Deprecating legacy services Type safety Schema checking and evolution

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Deployment runtime

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Deployment runtime

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Deployment runtime

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Deployment runtime

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Deployment runtime

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Deployment runtime

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Deployment runtime

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Deployment runtime

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Deployment runtime

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Deployment runtime

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Deployment runtime

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Deployment runtime

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Deployment runtime

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Deployment runtime

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Deployment runtime

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Deployment runtime

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Deployment runtime

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Deployment runtime

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Deployment runtime

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Deployment runtime

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Deployment runtime

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Deployment runtime

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Deployment runtime

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Deployment runtime Load balancer

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Deployment runtime Load balancer

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Deployment runtime Load balancer

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Deployment runtime Load balancer

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https://getnelson.io/

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{ "name": "Heather" } "missing field `age`", line: 1, column: 20

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syntax = "proto3"; message Person { string name = 1; uint32 age = 2; }

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syntax = "proto3"; message Person { string name = 1; uint32 age = 2; } protoc --java_out=./java --python_out=./python person.proto

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syntax = "proto3"; message Person { string name = 1; uint32 age = 2; } public static final class Person extends com.google.protobuf.GeneratedMessageV3 implements // @@protoc_insertion_point(message_implements:Person) PersonOrBuilder { Person = _reflection.GeneratedProtocolMessageType( 'Person', (_message.Message,), dict( DESCRIPTOR = _PERSON, __module__ = 'person_pb2' # @@protoc_insertion_point(class_scope:Person) )) _sym_db.RegisterMessage(Person) protoc --java_out=./java --python_out=./python person.proto

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Request schema Response schema

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Schema evolution Taken from https://docs.conﬂuent.io/current/schema-registry/avro.html

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Schema evolution Taken from https://docs.conﬂuent.io/current/schema-registry/avro.html

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Compatibility type Changes allowed Upgrade ﬁrst Schema evolution Taken from https://docs.conﬂuent.io/current/schema-registry/avro.html

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Compatibility type Changes allowed Upgrade first Backwards • Delete fields • Add optional fields Consumers Schema evolution Taken from https://docs.confluent.io/current/schema-registry/avro.html

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Compatibility type Changes allowed Upgrade first Backwards • Delete fields • Add optional fields Consumers Forwards • Add fields • Delete optional fields Producers Schema evolution Taken from https://docs.confluent.io/current/schema-registry/avro.html

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Compatibility type Changes allowed Upgrade first Backwards • Delete fields • Add optional fields Consumers Forwards • Add fields • Delete optional fields Producers Full • Modify optional fields Any Schema evolution Taken from https://docs.confluent.io/current/schema-registry/avro.html

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Related work • Nelson https://getnelson.io/ • Unison http://unisonweb.org/posts/ • Lasp https://lasp-lang.readme.io/ • Partisan http://partisan.cloud/ • Orleans https://dotnet.github.io/orleans/

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