Dapr Resiliency Example

Overview

This project demonstrates how to use Dapr resiliency policies with Conductor Resiliency Builder feature. For a detailed write-up, see this blog post: Fault-Tolerant Microservices Made Easy with Dapr Resiliency.

Prerequisites

• Docker
• Kubernetes
• Dapr
• Skaffold
• Hey
• Diagrid Conductor

Building the Applications

mvn clean package

Running with Kubernetes and Skaffold

Install Kubernetes, Dapr 1.14, and Diagrid Conductor (optional)

Follow the steps in the quickstart guide to install Kubernetes and Conductor.

Install Skaffold and Hey

To install Skaffold, use the following command:

brew install skaffold
brew install hey

Deploy the Application

To deploy the applications to a Kubernetes cluster:

skaffold dev

Demo Scenario

Fast Response

hey -n 100 -c 10 -m POST -d '{"orderId": "200"}' -H "Content-Type: application/json" http://localhost:5001/checkout

Total:  0.2 secs
[200]   100 responses

Slow Response

hey -n 100 -c 10 -m POST -d '{"orderId": "10"}' -H "Content-Type: application/json" http://localhost:5001/checkout

Total:  30.1844 secs
[200]   100 responses

Timeout

Apply Timeout policy 1second timeout

hey -n 100 -c 10 -m POST -d '{"orderId": "10"}' -H "Content-Type: application/json" http://localhost:5001/checkout

Total:  10.2080 secs
[200]   62 responses
[500]   38 responses

Retry

Apply Retry policy (100ms; 5 retries )

hey -n 100 -c 10 -m POST -d '{"orderId": "10"}' -H "Content-Type: application/json" http://localhost:5001/checkout


Total:  5.4999 secs
[500]   100 responses

Retry with Status Code (Status code 500)

Apply Retry policy with

hey -n 100 -c 10 -m POST -d '{"orderId": 500"}' -H "Content-Type: application/json" http://localhost:5001/checkout


Total:  5.4999 secs
[500]   100 responses

hey -n 100 -c 10 -m POST -d '{"orderId": "501"}' -H "Content-Type: application/json" http://localhost:5001/checkout

Total:  0.2 secs
[501]   100 responses

Circuit Breaker (consecutiveFailures > 5; 10s cooldown)

hey -n 100 -c 10 -m POST -d '{"orderId": "503"}' -H "Content-Type: application/json" http://localhost:5001/checkout

Summary:
Total:    0.3229 secs
Slowest:  0.1533 secs

[503]    100 responses

hey -n 100 -c 10 -m POST -d '{"orderId": "503"}' -H "Content-Type: application/json" http://localhost:5001/checkout

[200]    100 responses