Application Layer (GitHub System Design Primer) PDF
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This document provides an introduction to application layers and microservices, emphasizing the distinction between web layers and application layers. It also discusses the benefits of separating these components and how to leverage them in system architecture and service-orientation.
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11 Application Layer (GitHub System Design Primer) Application layer *[ Source: Intro to architecting systems for scale ]()* == Separating out the web layer from the application layer (also known as pl...
11 Application Layer (GitHub System Design Primer) Application layer *[ Source: Intro to architecting systems for scale ]()* == Separating out the web layer from the application layer (also known as platform == == == == == == layer ) allows you to scale and configure both layers independently. == == == Adding a new API results in adding application servers without necessarily adding == == == == == == == additional web servers. == == == The single responsibility principle advocates for small and autonomous services ** == == ** == == == == == that work together. == == Small teams with small services can plan more aggressively for rapid growth. == == == == == == Workers in the application layer also help enable asynchronism. == ==[ ]()== Microservices Related to this discussion are microservices , which can be described as a suite of ==[ ]()== == independently deployable , small, modular services. == == == == Each service runs a unique process and communicates through a well-defined, == == == == lightweight mechanism to serve a business goal. 1 == == == [ ]() * Pinterest, for example, could have the following microservices: user profile, follower, * feed, search, photo upload, etc. Service Discovery Systems such as Consul , Etcd , and Zookeeper can help services find each other == == [ == == ]() [ == == ]() [ == == ]() == == == by keeping track of registered names , addresses , and ports. == == == == == == == [ == Health checks help verify service integrity and are often done using an HTTP == ]() == == == == ==[ ]() endpoint. == Both Consul and Etcd have a built in key-value store that can be useful for == == == == [ == == ]() == storing config values and other shared data. == == == == == == == == Disadvantage(s): application layer == Adding an application layer with loosely coupled services requires a different == == == == == approach from an architectural , operations , and process viewpoint ( vs a == == == == == == == == == == == == monolithic system ). == Microservices can add complexity in terms of deployments and operations. == == == == == == == == == == Source(s) and further reading [ Intro to architecting systems for scale ]() [ Crack the system design interview ]() [ Service oriented architecture ]() [ Introduction to Zookeeper ]() [ Here's what you need to know about building microservices ]()
