envoyproxy/envoy

xds: add key-frame/i-frame concept to delta xDS

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#10,256 opened on Mar 4, 2020

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area/xdsdesign proposalhelp wanted

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Description

We should add the capability to signify a delta update as a "key-frame"/"i-frame" (as in video encoding). The idea here is the management server can indicate via a boolean that the client should flush all state and proceed to add any resources indicated in the delta update.

In many cases this will allow for a substantially simpler implementation of the management server in which delta updates can be best effort with a periodic re-sync to ensure there is no drift.

cc @markdroth @htuch @wgallagher @tomwans

Contributor guide

Research direction
Understand the delta xDS protocol in Envoy, then add a boolean field to indicate key frame updates, and modify the client to flush state on receiving such an update.
Tech stack
cpp
Domain
backendinfrastructureapi
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
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.
Fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
C++xDSEnvoy
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
30