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Embracing the Imposter
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[email protected]
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No content
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Over 60M active users
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Over 60M active users Over 30M songs
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Over 60M active users Over 30M songs 58 markets
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SAD STORY TO START WITH
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WE ARE DOING MICROSERVICES FOR YEARS
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Microservices 101
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Monolith
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Microservices Monolith
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Multiple datacenters Thousands of servers Hundreds of services
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Distributed System
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Distributed System AKA “complicated”
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Distributed System No reproducibility
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Distributed System No failure cases for tests
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LEGACY x2 FUN
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HARDWARE x10 FUN at scale FAILURES
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Actually…
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Test Double
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IMPOSTER
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Imposter
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Imposter Fail miserably
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Imposter Fail miserably Here you go!
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Imposter Here you go! Fail in 10 seconds
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Imposter Cat videos Here you go!
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Actually…
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Send A, B and C At rate X For Y time
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Send A, B and C At rate X For Y time
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Send A, B and C At rate X For Y time Load Injector
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Send A, B and C At rate X For Y time Load Injector
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Some More Steps
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Add functions like: Drop packets Add hooks to service discovery
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Add functions like: Drop packets Add pseudo-random delays
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Add functions like: Drop packets Add pseudo-random payload
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Add functions like: Drop packets [your function here]
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Ways to use
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Legacy dependency!
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Look Ma! No legacy!
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Fault injection
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Crazy neighbour
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Crazy neighbour Broken hardware
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Crazy neighbour Broken hardware Cat on a keyboard
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Crazy neighbour Broken hardware Cat on a keyboard nuke your DC
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future plans
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SUT Production
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SUT Production Imposter
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Configuration Madness
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Imposter, but… for client side
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distributed systems are complicated extremely
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it’s still possible to improve testability
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takes effort to do it
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[email protected]