Circuit Breaker www.thoughts-on-java.org Handle unavailable / - - PowerPoint PPT Presentation

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Oct 02, 2023 428 likes •615 views

Circuit Breaker www.thoughts-on-java.org Handle unavailable / unresponsive services Circuit Breaker Stop if X requests failed Goals Dont block local resource Dont overload unresponsive services Provide fallbacks

SLIDE 1

Circuit Breaker

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SLIDE 2

Circuit Breaker

Handle unavailable / unresponsive services
Stop if X requests failed
Goals
Don‘t block local resource
Don‘t overload unresponsive services
Provide fallbacks

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SLIDE 3

Spring Cloud Hystrix

Based on Netflix Hystrix
https://github.com/Netflix/hystrix
Spring Cloud Starter
spring-cloud-starter-hystrix

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SLIDE 4

Spring Cloud Hystrix

@EnableCircuitBreaker on configuration class
@HystrixCommand on method
Works within a @Service or @Component
Don‘t call internally

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SLIDE 5

Code Samples

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SLIDE 6

Hystrix Configuration

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SLIDE 7

Hystrix Configuration

Hystrix configuration
https://github.com/Netflix/Hystrix/wiki/Configuration
Set via
@HystrixProperty annotations
External configuration

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SLIDE 8

Hystrix Property

execution.isolation.thread.timeoutInMilliseconds
Timeout in ms for command execution
Default: 1000

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SLIDE 9

Hystrix Property

circuitBreaker.requestVolumeThreshold
Minimum number of requests to trip the circuit
Default: 20

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SLIDE 10

Hystrix Property

circuitBreaker.errorThresholdPercentage
Error percentage that trips the circuit
Default: 50

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SLIDE 11

Hystrix Property

circuitBreaker.sleepWindowInMilliseconds
Time until new attempt
Default: 5000

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SLIDE 12

Annotation-based

Add commandProperties to @HystrixCommand
Array of @HystrixProperty

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SLIDE 13

Code Samples

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SLIDE 14

File-based

Define commandKey for @HystrixCommand

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SLIDE 15

File-based

Same as annotation-based
Requires prefix
hystrix.command.<CommandKey>.<ParamName>

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SLIDE 16

Code Samples

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SLIDE 17

Summary

Handle unavailable / unresponsive services
Release local resources
Don‘t overload other services
Avoid cascading effects
Provide fallbacks