apache/openwhisk

provide a run-once mode that disables container reuse

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#3,896 opened on Jul 24, 2018

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 (1 comment) (0 reactions) (0 assignees)Scala (6,777 stars) (1,177 forks)batch import
enhancementhelp wanted

Description

Today we reuse containers for performance reasons. There are many advantages however to run-once that disables container reuse. Just as @tysonnorris is adding support for intra-container concurrency via an opt-in annotation, we can do the same to prevent container reuse for an action annotated accordingly to create a new container every time. This has the nice property of ensuring that every function starts from the same pristine environment.

Contributor guide

Tech stack
scaladocker
Domain
cloud
Issue type
feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
3-5 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
mostly clear
Prerequisites
Scala knowledgeOpenWhisk container modelAnnotation system
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
30
Research direction
The issue requests a run once mode that disables container reuse, inspired by the annotation based approach for intra container concurrency. A newcomer should explore the container lifecycle management in OpenWhisk's invoker component (e.g., `ContainerProxy`). Review the existing annotation mechanism for concurrency to understand how to add a similar annotation for container reuse. Look at linked PRs or comments for context, particularly the work by @tysonnorris. The implementation likely involves modifying the container creation logic to skip reuse when the annotation is present.
provide a run-once mode that disables container reuse · apache/openwhisk#3896 | Good First Issue