Scaling event driven systems: Node.js and GraphQL

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

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   Once upon a time there was ...
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   … a monolith
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   … split into microservices
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   … choreographed by events
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   Event driven designs are focused on system
   behaviour rather than structure.
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   Node.js ...
   … an asynchronous event-driven runtime
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   How does Node scales?
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   Requirements
   - performant
   - cost effective
   - reliable, fail safe
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    Node performs well when the amount of
    CPU work per request is relatively “small”.
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    Scale Horizontally
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    Running more instances of a non
    performant app is not cost effective.
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    Scale Vertically
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    What about … building apps that leverage the
    hardware more?
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    Node inherits the Event Loop model that
    made Javascript successful in the
    browser.
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    Worker threads
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    Can I use worker threads for everything?
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    Spawning workers is expensive if done
    frequently.
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    How can I use this with GraphQL?
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    GraphQL subscriptions:
    - server: push data to client
    - clients: listen to real time messages
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    In the real world ...
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    Demo
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    Future work
    - deployment to cloud
    - add performance hooks
    - set up profiling
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    Summing Up
    - node is a perfect fit for event driven systems
    - worker threads improve performance
    - easily go fullstack with GraphQL
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    thank @you
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    Bogdan Nedelcu
    Entrepreneurial software engineer with a proven
    track record across large IT projects within the
    finance and construction industry.
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