apache/openwhisk

prefetch container optimization

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#2,359 opened on Jun 12, 2017

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 (2 comments) (2 reactions) (0 assignees)Scala (1,177 forks)batch import
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Description

To reduce cold start overhead -- if we have a good reason to believe that an action will be invoked soon -- then send a message to /init a container. I think this could be done by adding "init" messages to the kafka protocol. When receiving an "init" message, the invoker would /init a container if none is present already.

The obvious use case is sequences -- when a sequence is run, "init" all the actions in the sequence immediately.

Contributor guide

Research direction
Study the existing Kafka protocol messages and the invoker initialization logic. Implement a new 'init' message type that triggers container pre warming. Focus on how sequences can send init messages for all actions before execution.
Tech stack
docker
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.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
Apache KafkaDocker
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
70