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Functional Programming in Serverless World
Lambda Days 2018 - Cracow (23.02.2018)
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~ # whoami (afronski)
✓ Software and Operations EngineerAppliscale
Erlang, Elixir, Node.js AWS (2 certificates)
✓ Functional Miners co-organizer
P.S. Appliscale is hiring!
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What is serverless?
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http://celiacandthebeast.com/wp-content/uploads/2014/08/SRSLY.jpg
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There are servers
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There are ops
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read.acloud.guru/iaas-paas-serverless-the-next-big-deal-in-cloud-computing
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Serverless
Back-end as a Service (BaaS)
Function as a Service (FaaS)
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Incoming Event
Source Code Package Configuration
Function (Execution Unit)
RAM: 512 MB
RAM: 512 MB 0.5 GB
Real time: 120 msBill time: 200 ms (buckets by 100 ms)
Price: 0.00001667 GB * seconds
Cost: 0.00001667 * 0.5 GB * 0.2 s = 0.000001667 USD = 1.7 μUSD
Response
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Whyserverless?
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http://www.doc.ic.ac.uk/~rbc/papers/fse-serverless-17.pdf
Gojko Adzic - Designing for the Serverless Age (GOTO 2017)
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Costs
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Architecture[...] breaking the monolith into functions that could be independently deployed, meant that they were better able to split the team up to work on more things in parallel, and to deploy each feature separately.
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Operations[…] so their estimate is that moving to Lambda gave an operational cost reduction of greater than 95% for a comparable amount of compute.
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Technology
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Shims
Using Node.js process API to spawn an
executable
Handling events reported by subprocess and passing results to
the AWS Lambda handler
Sending input arguments to the
spawned subprocess
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Measurements
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Test Scenarios1. Two endpoints:
a. Echoing incoming body.b. Sieve of Eranthoses (naive implementation).
2. Package Size.3. Memory Usage (dependent on input argument).4. Execution Time (dependent on input argument).5. Startup Time (cold start, no work done).
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"Situated" Programs (from Rich Hickey's keynote at Clojure/Conj 2017)
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How long does AWS Lambda keep your idle functions around before a cold start?
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Constraints
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Constraints1. No knowledge about container and its reuse.2. New approach requires new paths.3. Limits everywhere!4. Provider limitations.5. VM optimizations required from the get go.6. Beware the toolchain!
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Let’s recap!
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Safe default:F# on Azure or AWS
(.NET Core 2.0)
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http://www.doc.ic.ac.uk/~rbc/papers/fse-serverless-17.pdf
Gojko Adzic - Designing for the Serverless Age (GOTO 2017)
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Context is King
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λThank you!
Questions?
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References
1. Our company - Appliscale and job offers.2. Me - afronski.pl and my talks.3. Functional Miners meetup (facebook, twitter, github, email).4. Serverless Architecture, Serverless (Martin Fowler’s articles).5. AWS Lambda, Google Cloud Functions, Azure Functions.6. Container Reuse in AWS Lambda.7. Running Executables in AWS Lambda.8. Serverless Computing: Economic and Architectural Impact.9. Why the JVM is a Good Choice for Serverless Computing.
10. Droplr Serverless Revolution.11. Optimizing Enterprise Economics with Serverless.12. Should I use AWS Lambda or EC2?13. AWS Lambda support for .NET Core 2.0.14. Repository with examples, scripts, and measurements.