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About Us Olga Maciaszek-Sharma (@olga_maciaszek) Senior Software Engineer in Spring Cloud team. Works mostly on: ● Spring Cloud Contract ● Spring Cloud Netflix ● Spring Cloud Gateway ● Spring Cloud OpenFeign https://github.com/OlgaMaciaszek Marcin Grzejszczak (@mgrzejszczak) Spring Cloud developer at Pivotal. ● Spring Cloud Sleuth ● Spring Cloud Contract ● CI / CD Blog: https://toomucoding.com

Spring + Netflix during Cloud-Native transition Spring Cloud Netflix Eureka Client Spring Cloud Netflix Eureka Server Spring Cloud Netflix Archaius Spring Cloud Netflix Ribbon Spring Cloud Netflix Zuul Spring Cloud Netflix Hystrix Spring Cloud Netflix Hystrix Dashboard Spring Cloud Netflix Turbine Spring Cloud Netflix Hystrix Stream Spring Cloud Netflix Turbine Stream

Netflix projects passed into maintenance or superseded ● Ribbon, 2016 - https://github.com/Netflix/ribbon#project-status-on-maintenance ● Hystrix Dashboard → Atlas ● Zuul 1 → backward incompatible Zuul 2 ● Archaius 1 → backward incompatible Archaius 2 ● Hystrix, 2018 - https://github.com/Netflix/Hystrix#hystrix-status

Spring Cloud Netflix Maintenance Mode Greenwich RC1 announcement

Maintenance Mode No new features Fixes for blockers and security issues only Considering and reviewing small PRs from the community

Spring + Netflix going into maintenance Spring Cloud Netflix Eureka Client Spring Cloud Netflix Eureka Server Spring Cloud Netflix Archaius Spring Cloud Netflix Ribbon Spring Cloud Netflix Zuul Spring Cloud Netflix Hystrix Spring Cloud Netflix Hystrix Dashboard Spring Cloud Netflix Turbine Spring Cloud Netflix Hystrix Stream Spring Cloud Netflix Turbine Stream

CardService UserService Proxy FraudVerifier Create new user Verify new user Verify new card Register application Create new user

Demo Old Stack Card Application Service (Ribbon Load Balancer) Zuul Proxy (Hystrix, Hystrix Dashboard) User Service (Hystrix, Hystrix Dashboard) Fraud Verifier Turbine App Ignored Service Eureka Service Discovery

Spring Cloud New Stack Time to make the transition

Spring Cloud Netflix Ribbon → Spring Cloud Load Balancer Currently `@LoadBalancerClient` works with WebFlux only Lacking implementations Spring Cloud Netflix Ribbon still used in other projects

Spring Cloud Netflix Zuul → Spring Cloud Gateway Zuul: ● Non-reactive, Servlet-based ● Routing by serviceId by default ● Possibility to set up options via properties, including ignored services, patterns and headers and ignoring sensitive headers (true by default) ● Routes set in properties with limited config (id, serviceId, path, url, stripPrefix, retrayable, sensitiveHeaders, customSensitiveHeaders) Gateway: ● Reactive, Netty-based ● Explicit route setup required ● Possibility to define routes both via properties and via functional configuration ● Predicates and Filters ● All headers passed on by default

● More than 20 filters ● As the infra is no longer blocking you, you can now move to reactive Web in your services if it makes sense for your use-case

Spring Cloud Hystrix → SC CircuitBreaker + Resilience4J SC Hystrix: ● Uses Hystrix underneath ● Possibility to use via @HystrixCommand annotation ● Possibility to pass fallback method in annotation SC CircuitBreaker: ● A Spring Cloud abstraction for circuit breakers https://github.com/spring-cloud-incubator/spring-cloud-circuitbreak er ● Currently supports Hystrix and Resilience4J ● Using via injected CircuitBreakerFactory bean and its create() method ● Possibility to configure by setting up Customizer bean in a @Configuration class

Spring Cloud Netflix Turbine → Micrometer + Prometheus Turbine: ● Aggregated Hystrix metrics from various applications via HTTP ● Via the Turbine Stream, managed to collect those via messaging Micrometer + Prometheus: ● Micrometer - a metrics collection facade ● Its aim is to allow you to time, count, and gauge your code with a vendor neutral API ● One of the monitoring systems to which you can output the metrics is Prometheus

Spring Cloud Netflix Archaius → SC Config Server

Demo New Stack Card Application Service (SC LoadBalancerClient, Micrometer) Gateway Proxy (CircuitBreaker, Micrometer) User Service ([Resilience4J], Micrometer) Fraud Service (Micrometer) Prometheus Ignored Service [Eureka Service Discovery]

Spring Cloud New Stack Should you make the change?

Possible Issues

Check out master and old-stack branches https://github.com/OlgaMaciaszek/spring-cloud-n etflix-demo

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