Building Resilient Frontend Systems - NationJS

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BUILDING RESILIENT FRONTEND SYSTEMS Ian Feather - BuzzFeed

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RESILIENCE IS FUNCTION IN A HOSTILE ENVIRONMENT

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HOW CAN OUR SYSTEMS FAIL? SECTION 1

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3RD PARTY AVAILABILITY

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S3 DYN DNS

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S3 DYN DNS CDN

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S3 DYN DNS CDN S3

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3RD PARTY AVAILABILITY

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3RD PARTY AVAILABILITY OUR OWN BUGS

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3RD PARTY AVAILABILITY OUR OWN BUGS

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3RD PARTY AVAILABILITY OUR OWN BUGS THE NETWORK

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1.04% OF REQUESTS FOR JAVASCRIPT WILL TIMEOUT

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13 MILLION PAGEVIEWS PER MONTH

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3RD PARTY AVAILABILITY OUR OWN BUGS THE NETWORK

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3RD PARTY AVAILABILITY OUR OWN BUGS THE NETWORK USERS’ PRIVILEGE

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8.9% OF USERS USE SOME FORM OF CONTENT BLOCKER

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3.84% WON’T SUCCESSFULLY DOWNLOAD OUR FONTS

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38 MILLION PAGEVIEWS PER MONTH

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3RD PARTY AVAILABILITY OUR OWN BUGS THE NETWORK USERS’ PRIVILEGE

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HOPE FOR THE BEST

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DESIGN FOR FAILURE

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DESIGN FOR FAILURE SECTION 2

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PRIORITIZE CRITICAL PARTS OF THE PAGE

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User

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User html

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User html CSS JS IMAGES

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User html IMAGES CSS JS IMAGES

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User FONTS html IMAGES CSS JS IMAGES

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User FONTS html IMAGES DATA (xhr) CSS JS IMAGES

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User FONTS html IMAGES DATA (xhr) IMAGES CSS JS IMAGES

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User FONTS html IMAGES DATA (xhr) IMAGES CSS JS IMAGES Images

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User FONTS html IMAGES DATA (xhr) IMAGES CSS JS IMAGES HTML

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PRIORITIZE CRITICAL PARTS OF THE PAGE

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PRIORITIZE CRITICAL PARTS OF THE PAGE MAKE ERRORS A FIRST CLASS CITIZEN

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SOMETHING BROKE. SHOULD I TELL THEM?

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✘

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PRIORITIZE CRITICAL PARTS OF THE PAGE MAKE ERRORS A FIRST CLASS CITIZEN

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PRIORITIZE CRITICAL PARTS OF THE PAGE MAKE ERRORS A FIRST CLASS CITIZEN REPORT YOUR ERRORS

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KNOWING IT’S BROKEN BEFORE TWITTER DOES

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PRIORITIZE CRITICAL PARTS OF THE PAGE MAKE ERRORS A FIRST CLASS CITIZEN REPORT YOUR ERRORS

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MITIGATE RISK SECTION 3

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BUILD IN REDUNDANCY

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Asset SERVER 1

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Asset SERVER 1 www.asset-server-one.com/styles.css

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Asset SERVER 1 www.asset-server-one.com/styles.css

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✖ Asset SERVER 1 www.asset-server-one.com/styles.css

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✖ Asset SERVER 1 Asset SERVER 2 www.asset-server-one.com/styles.css

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✖ Asset SERVER 1 Asset SERVER 2 www.asset-server-two.com/styles.css www.asset-server-one.com/styles.css

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✖ Asset SERVER 1 Asset SERVER 2 www.asset-server-two.com/styles.css www.asset-server-one.com/styles.css

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Asset SERVER 1 Asset SERVER 2 Proxy service

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Asset SERVER 1 Asset SERVER 2 www.asset-server.com/styles.css Proxy service

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Asset SERVER 1 Asset SERVER 2 www.asset-server.com/styles.css Proxy service

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Asset SERVER 1 Asset SERVER 2 www.asset-server.com/styles.css Proxy service

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CLOUD PROVIDER CDN STATIC ASSET SERVER FONT PROVIDER IMAGE SERVICE ADS PROVIDER AB TEST SERVICE

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BUILD IN REDUNDANCY

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BUILD IN REDUNDANCY SERVE STALE CONTENT

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SERVER

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SERVER CDN

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SERVER CDN

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SERVER CDN

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SERVER CDN

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SERVER CDN

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SERVER CDN

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CDN SERVER

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CDN ✖ SERVER

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CDN ✖ SERVICE WORKER SERVER

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CDN ✖ SERVICE WORKER SERVER

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BUILD IN REDUNDANCY SERVE STALE CONTENT

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IN SUMMARY

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IN SUMMARY

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THANKS

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INCREDIBLE  PHOTOGRAPY VIA UNSPLASH NeONBRAND - https://unsplash.com/photos/plrlb68XPqI Marc Liu - https://unsplash.com/photos/Z8epsqHdYeM Amy Reed - https://unsplash.com/photos/49ZXvCLerUo Matt Le - https://unsplash.com/photos/SJSpo9hQf7s White wolf wizard - https://unsplash.com/photos/cttQw_azA40