envoyproxy/envoy

CacheFilter: Handle backpressure from downstream

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#9,835 opened on Jan 25, 2020

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area/cachehelp wanted

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Description

CacheFilter (#7198) doesn't yet handle backpressure from downstream, and could thus overflow downstream buffers when serving from cache. This must be addressed before CacheFilter will be suitable for production use.

Contributor guide

Research direction
Understand how CacheFilter currently reads from cache and writes to downstream buffers. Identify where backpressure is ignored and implement flow control using Envoy's buffer watermark callbacks.
Tech stack
cpp
Domain
backendinfrastructure
Issue type
Bug
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
C++Envoy proxy internalsBuffer management
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
25