@nklmish

MicroserviceNo fluff, the REAL stuff

The best preparation for tomorrow is doing your best today

@nklmish

@nklmish

Agenda

Common Problems

Microservice - core concepts

Pros & Cons

Code

@nklmish

About me

Senior Software developer at 4FinanceIT

Consultant and architect around JVM technology

@nklmish

Monolithic ?

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Common Problems

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Too much complexity needs to be exposed

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legacy components - Hard to upgrade

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Workaround

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New functionality can just pop

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Easy to maintain standards, hard to maintain quality

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Easy to maintain quality, hard to maintain standards

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Refactoring

(Before)

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Refactoring

(After)

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Microservices

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Microservices

1

Application

2 3 4 5

6 7 8 9 N

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Core Concepts

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Concept 1 : Service Registry

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Service Registry

Zookeeper Eureka ConsulConsistency

Partition

Availability

PartitionAvailability

Partition

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Eureka

Components:

Server - REST service

Client - Java component (Used within a microservice)

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Eureka Client Server CommunicationClien

t

Serv

er

Registration: first heartbeat (after 30s)

Renew lease: heartbeat/30s

Fetching Registry: retrieve & cache it locally

Registry Update: /30s

Shutdown: Cancel request on shutdown

Renew fail

ure:

No heart

beat for

90s,

REMOVE

Shutdow

n:

Removes

instance

from reg

istry

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Concept 2 : Load balancing

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Ribbon

Client side load balancer

Built-in Failure resiliency

Rule based load balancing

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Concept 3 : Edge Service

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Zuul

Error

RoutingPre PostRequest

Response

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Zuul features

Load Shedding

Authentication & Security

Static Response handling

Surgical Debug Filter

Stress Testing

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Concept 4 : Failure management

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Hystrix

Manage failures(latency + fault tolerance)

Cascading failures

Fail fast approach

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Pros & Cons

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Pros

Component

Richer tech stack

Scalability

Resilience

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Cons

Distributed system.

Arsenal of tools (Infrastructure)

Testing

Transactions

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DEMO

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Demo

Spring Cloud OSS

http://tiny.cc/micro-code

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Spring Cloud

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DEMO

CATALOG SERVICE

PRODUCT SERVICEPRICE

SERVICECOMMENT SERVICE

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Microservice in REAL life

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Metrics

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Thank You Дякую

Questions?

http://tiny.cc/nklmish-micro