MSA , 표준프레임워크 개발 가이드

참고 소스

https://github.com/sblee1031/Kosta/tree/main/ORACLE_DB_THEOTY/Oracle_DB_project/resttempate

GitHub - sblee1031/Kosta: KOSTA_219

넷플릭스 MSA

https://www.samsungsds.com/kr/insights/msa_and_netflix.html

넷플릭스로 알아보는 MSA

[표준프레임워크]MSA_적용_개발_가이드_v1.2.0.pdf

6.21MB

 

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기존 EJB에서 DevOps로 개발과 운영을 함께 하는 시스템으로 바뀜.

 

Circuit Open이란?

Catalogs2Hystrix - application.yml 

server:
  port: 8081

spring:
  application:
    name: catalog
    
hystrix:
  command:
    default:    # command Key. use 'default' for global setting.
      execution:
        isolation:
          thread:
            timeoutInMilliseconds: 500       
      metrics: #1분(60000)동안 최소 1회 호출 이상, 50% 이상 실패면 circuit open
        rollingStats: 
          timeInMilliseconds: 60000     
      circuitBreaker:
        requestVolumeThreshold: 1 
        errorThresholdPercentage: 50

 

Customers2Hystrix - CustomerController.java

package egovframework.msa.sample.controller;

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("/customers")
public class CustomerController {
	int cnt=0;
	@GetMapping("/{customerId}")
	public String getCustomerDetail(@PathVariable String customerId) {
	//timeout test
//		long milli = 3*1000;
//		try {
//			Thread.sleep(milli);
//		} catch (InterruptedException e) {
//			// TODO Auto-generated catch block
//			e.printStackTrace();
//		}
//		
//		System.out.println("request customerId :" + customerId);
//		return "[Customer id = " + customerId + " at " + System.currentTimeMillis() + "]";

		//exception test
//		throw new RuntimeException("I/O Exception");

		//circuit open test
		throw new RuntimeException("I/O Exception");
		
	}
}

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Client Load Balancer - Ribbon (Catalog - Front Server --> Customer - Back Server)

 

LoadBalancer - Ribbon 설정

LoadBalancing 결과

8082, 8083 포트 번호 순서대로 Balancing

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Eureka

 

 

 

 

MSA개발 주의점

 

Kafka를 활용한 비동기 일처리 개념