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Microservices (Disadvantages (Excessive emphasis on service size,…

- - - - Server side service discovery
        
        Advantage
        Discovery logic is decoupled from client
        
        Disadvantage
        Need to create load balancer separately - which is another HA system
        
        What?
        Client makes a request to a service via a load balancer - lb queries service registry. Ex: AWS Elastic Load Balancer
      - Client side service discovery
        
        What:?
        Client queries service registry before making a request. Ex: Netflix OSS, Netflix Eureka,
        
        Advantage
        Simple
        Client knows about available instances
        
        Disadvantage
        Couples client with service registry
    - - What?
        Database containing network locations of service instances.
      - How
        
        Self Registration Pattern
        
        What?
        When an instance spins up - it registers with the service registry.Also periodically, sends its information to suggest that the instance is still active.
        
        Advantages
        Simple
        
        Disadvantages
        Couples instances to service registry
        
        Third party registration pattern
        
        What?
        Another system component known as service registrar handles registration. Tracks by polling/subscribing to events.
        
        Advantages
        Decouples instances and service registry
        
        Disadvantages
        Yet another HA system
- - - - Styles
        
        One to one : Request Response
        
        One to many : none
      - Technologies
        
        REST
        
        Mostly uses HTTP. Uses verbs to manipulate resources - GET/POST/PUT
        
        Thrift
        
        Framework for writing cross-language RPC clients and servers from a given interface definition . Supports JSOn, binary and compact binary
    - - Styles
        
        One to one: Notification vs Request/async response
        
        One to many - Publish/subscribe vs Publish/async response
      - Technologies
        
        Messages
        
        What?
        A message consists of headers (metadata such as the sender) and a message body.
        Messages are exchanged over channels
        
        Messaging systems
        Different on basis of protocolc - AMQP, STOMP. ex: Rabbit, Kafka, ActiveMQ, NSQ