Hystrixwhy resiliency?

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.

Why we need Resiliency?

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

How to use - ConfigurationsCircuit Breaker➔ circuitBreaker.enabled➔ circuitBreaker.requestVolumeThreshold➔ circuitBreaker.sleepWindowInMilliseco

nds➔ circuitBreaker.errorThresholdPercenta

ge➔ circuitBreaker.forceOpen➔ circuitBreaker.forceClosed

Metrics➔ metrics.rollingStats.timeInMilliseconds➔ metrics.rollingStats.numBuckets➔ metrics.rollingPercentile.enabled➔ metrics.rollingPercentile.timeInMillisec

onds➔ 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

Questions?