About Me ● Engineer and builder ● 3x entrepreneur ○ 1999-2006: Founding CTO of AllDorm ○ 2008-2011: Founding Partner of Appoxy ○ 2011-2017: Founding CEO of Iron.io ● Now VP Serverless, Oracle me
What is Serverless? ● Serverless is an abstraction of infrastructure and its operations including provisioning, scaling, patching, etc. ● Serverless architecture is when an app is built entirely on serverless components (compute, storage, networking) ● Faas is the compute component in a serverless architecture
Functions-as-a-Service ● Functions are small bits of code that do one thing well and are easy to understand and maintain ● As a service means no complicated plumbing, the system takes care of provisioning, scaling, patching, maintaining, etc. Each function scales independently. In mathematics, a function is a relation between a set of inputs and a set of permissible outputs with the property that each input is related to exactly one output. Function (mathematics) - Wikipedia https://en.wikipedia.org/wiki/Function_(mathematics)
Containers vs Functions Function is a container with a set of known traits: ● Short running ● Ephemeral ● Stateless ● Invoked ● Single Purpose ● Self-contained
Introducing the Fn Project ● Launched in October focused on open source (apache 2), multi-cloud, serverless services, starting with FaaS ● Iron.io team joined Oracle, now a 20-person “serverless” org ● Maniacal focus on the developer experience ● Independently governed at github.com/fnproject (currently) ● Members on the CNCF serverless working group ● We are building our community and partnerships
An Fn Function ● Small chunk of code wrapped into a container image ● Gets input via STDIN and environment ● Produces output to STDOUT ● Logs to STDERR The Fn server handles everything else, like the API gateway, piping things around, storing logs, etc.
Function Development Kits (FDKs) ● Used to help with parsing input and writing output ● Familiar syntax for Lambda developers ● Simply write a `handler` function that adheres to the FDK’s interface and it will parse STDIN and provide the input data to your function and deal with writing the proper output format. ● Makes it a lot easier to write hot functions
Debugging ● fn calls list myapp ● fn calls get myapp ● fn logs get myapp ● Metrics created using OpenTracing w/ initial collectors and extensions for Prometheus, ZipKin, and soon Jaeger
Fn Server ● Handles CRUD operations for setting up routes and functions ● Executes sync functions, returning responses to clients immediately ● Queues async function calls ● Executes async functions when capacity is available ● Written in Go, easy to extend via plugin module system
Fn LB ● Simple, fast load balancer that routes functions to certain nodes consistently for hot function efficiency ● Scales each function independently based on traffic to any particular function ● Can be used to scale Fn servers and infrastructure as well as it has a view of global state of all fn servers
Supporting Services ● DB, MQ, blob store are all pluggable modules that are thin wrappers around their respective drivers. ○ DB: MySQL, sqlite3, Postgres ○ Queue: Redis, Kafka ○ Registry: Any Docker v2-compliant, even private ● Metrics/Monitoring ○ OpenTracing API for metrics ○ Prometheus support, pluggable backends ○ Logging via syslog
Kubernetes ● Fn is scheduler agnostic but lots of optimization/management work in process to optimize on Kubernetes ● Helm chart available at https://github.com/fnproject/fn-helm ● Thinking about deeper Kubernetes integrations including CRD’s to model functions
Fn Flow ● Build long-running, reliable, scalable functions with rich sets of language-specific primitives including fork-join, chaining, delays and error handling ● Supports complex parallel processes that are readable and testable (including unit tests) with standard programming tools ● Java support using CompletableFuture API from Java 8 with JS, Python, Go language support on the way!
Scraper Plate Detect Function Draw Function Slack Function Twitter Function FlowFuture.invoke() thenCompose() thenCompose() allOf() whenComplete() Flow Function
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