Application resiliency using netflix hystrix

Aug 31, 2015Download as PPTX, PDF0 likes1,723 views

My presentation on need for resiliency and how to achieve using Netflix Hystrix. This was received well across the team and uploading for the sake of others

Agenda
❏ What is Resiliency?
❏ Why we need Resiliency?
❏ What is Hystrix
❏ Not a silver bullet
❏ How to use
❏ What you get and don’t
❏ What’s next

What is Resiliency?
Resiliency is the ability to provide and maintain an acceptable level of service in the face of
faults and challenges to normal operation.” Threats and challenges for services can range
from simple misconfiguration over large scale natural disasters to targeted attacks.

What is Hystrix?
Hystrix is a latency and fault tolerance
library designed to isolate points of access
to remote systems, services and 3rd party
libraries, stop cascading failure and enable
resilience in complex distributed systems
where failure is inevitable.

Not a silver bullet
More like a Gauge &
Circuit breaker,
Rather than a
pipeline,
Certainly NOT the
Thor’s Hammer

public class CommandHelloWorld extends HystrixCommand<String> {
private final String name;
public CommandHelloWorld(String name) {
super(HystrixCommandGroupKey.Factory.asKey("ExampleGroup"));
this.name = name;
}
@Override
protected String run() {
// a real example would do work like a network call here
return "Hello " + name + "!";
}
}
CommandHelloWorld.execute();
How to use

How to use - Configurations
Circuit Breaker
➔ circuitBreaker.enabled
➔ circuitBreaker.requestVolumeThreshold
➔ circuitBreaker.sleepWindowInMilliseconds
➔ circuitBreaker.errorThresholdPercentage
➔ circuitBreaker.forceOpen
➔ circuitBreaker.forceClosed
Metrics
➔ metrics.rollingStats.timeInMilliseconds
➔ metrics.rollingStats.numBuckets
➔ metrics.rollingPercentile.enabled
➔ metrics.rollingPercentile.timeInMillisecond
s
➔ metrics.rollingPercentile.numBuckets
➔ metrics.rollingPercentile.bucketSize
execution.isolation.thread.timeoutInMilliseconds

What you get and don’t
➔ Real-time Dashboard
➔ Circuit Breaker
➔ Auto Mark Up / Mark Down
➔ Highly Configurable
➔ Reduced Latencies
➔ Faster responses
➔ 100% availability
➔ Magic!!!

What’s Next
➔ Aero Hystrix
➔ Use it for your dependencies
➔ Use the dashboard
➔ Checkout Turbine

Resilience becomes a must. Actually resilience is an issue for a long time, but with ever-increasing distribution it becomes a must. But how can we implement resilience into our applications? Hystrix, an open-source library developed by Netflix provides a nice starting point. It provides downstream isolation by implementing patterns like timeout, circuit breaker and load shedder. This presentation gives an introduction into Hystrix, providing lots of code examples.

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