Scaling event driven systems: Node.js and GraphQL

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@bogdanned Bogdan Nedelcu 1 Scaling event driven systems: Node.js and GraphQL Principal Software Engineer Node.js Global Summit 05.31.2020

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@bogdanned Once upon a time there was ... 2

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@bogdanned … a monolith 3

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@bogdanned … split into microservices 4

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@bogdanned … choreographed by events 5

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@bogdanned Event driven designs are focused on system behaviour rather than structure. 6

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@bogdanned Node.js ... … an asynchronous event-driven runtime 7

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@bogdanned How does Node scales? 8

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@bogdanned Requirements - performant - cost effective - reliable, fail safe 9

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@bogdanned Node performs well when the amount of CPU work per request is relatively “small”. 10

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@bogdanned Scale Horizontally 11

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@bogdanned Running more instances of a non performant app is not cost effective. 12

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@bogdanned Scale Vertically 13

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@bogdanned What about … building apps that leverage the hardware more? 14

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@bogdanned Node inherits the Event Loop model that made Javascript successful in the browser. 15

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@bogdanned Worker threads 16

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@bogdanned Can I use worker threads for everything? 18

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@bogdanned Spawning workers is expensive if done frequently. 19

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@bogdanned How can I use this with GraphQL? 20

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@bogdanned GraphQL subscriptions: - server: push data to client - clients: listen to real time messages 21

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@bogdanned In the real world ... 23

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@bogdanned Demo 25

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@bogdanned Future work - deployment to cloud - add performance hooks - set up proﬁling 27

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@bogdanned Summing Up - node is a perfect ﬁt for event driven systems - worker threads improve performance - easily go fullstack with GraphQL 28

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@bogdanned thank @you 29

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@bogdanned Bogdan Nedelcu Entrepreneurial software engineer with a proven track record across large IT projects within the ﬁnance and construction industry. 30