fission-src/Documentation/Roadmap.md

Fission Roadmap

Function features (area-func)

• Secrets, configmaps, env vars
• Volumes
• Mem requests and limits
• Function exec time deadline
• Expose a regular K8s Service for a function

Fission API (area-api)

• TPR-based controller
• API authentication
• Aggregated API server

Development Workflows (area-dev)

• Function Versioning
• Versioning for a group of functions
• Rolling upgrades
  • for one function
  • for multiple functions
  • for functions + other kubernetes deployments
• Unit testing

API Gateway / Ingress features (area-ingress)

• Function authn hooks
• K8s Ingress flag
• Bundle an ingress controller?

Workflows and Function composition (area-composition)

• Simple Composition - Sync
• Simple Composition - Async
• Hooks (pre, post, on-error)
• Workflows
• Testing in the presence of function composition

Events (area-events)

• NATS

• Kafka

• AWS: SNS, SQS

• Google PubSub

• RabbitMQ

• Other event sources

• Bundle an event queue (NATS streaming, most probably)

Operability (area-ops)

Fission Install/Upgrade (area-install)

• Helm Installer for Fission
• Helm installation for fission functions
• CLI installer/upgrader? ("fission upgrade")
• Upgrade checker/reminder (like minikube does)
• CLI auto-upgrader

Function observation (area-observe)

• Function Logging
• Tracing -- Opentracing
• Metrics -- Prometheus
• Function exception tracking
• Logging function load errors
• Tracing fission overheads for each function

Function Security

• Function isolation (is authz hook sufficient or do we need something like mutual TLS?)
• Function service accounts

UX, especially for beginners (area-ux)

• Fission CLI should include a tutorial
• Fission CLI should have a way to drop you into the UI
• Eliminate FISSION_URL, just use kube client to find fission url. Also useful to grab credentials.

Documentation (area-doc)

• Installation guide improvements
• Troubleshooting guide for common problems
• FAQ
• Performance overview
• Render docs nicely to fission.io

Web UI (tracked separately in the fission-ui repo)

Performance and Scalability (area-perf)

• Autoscaling
• Cold-start optimization -- optimistically choose from pool, save about ~20msec
• Cold-start optimization -- preload funcs in fetcher
• Cold-start optimization -- preload libraries in envs (v2) -- mem vs. speed tradeoff

Function extensibility (area-ext)

• Env v2: easy addition of dependencies etc.
• Integration with Service Broker

Multi-area stuff

• Execution strategies: cold-start pool vs create-pod-on-cold-start -- one size doesn't fit all, at least with current tech; abstract over execution strategies according to requirements