TypeScript Microservices by Parth Ghiya
Author:Parth Ghiya
Language: eng
Format: epub
Tags: COM051260 - COMPUTERS / Programming Languages / JavaScript, COM051240 - COMPUTERS / Software Development and Engineering / Systems Analysis and Design, COM051230 - COMPUTERS / Software Development and Engineering / General
Publisher: Packt Publishing
Published: 2018-05-30T09:38:09+00:00
Circuit breakers and its role
In the practical world, errors do occur. Services can timeout, become unreachable, or take longer to complete. Being a distributed system, the entire system should not go down. The circuit breaker is the solution to this problem and it is a very important component in API Gateway.
The pattern essentially works in two states. If the circuit is closed, everything is normal, the request is dispatched to the destination, the response is received. But if there are errors or timeouts the circuit is open which means that route is not available as of now, we need to go a different route or way to achieve the service request. To achieve this functionality, Netflix has open sourced their project—Hystrix. This is, however, the Node.js version of the same: https://www.npmjs.com/package/hystrixjs (it's not official from Netflix, but rather an open source project). It even has the Hystrix dashboard for monitoring purposes. According to Hystrix's library, it has the following capabilities:
Protect system against any failures which occur because of network issues or any third-party clients or libraries
Stop propagating failures and avoid dispersion of error
Fail fast, fail often, fail better, fail forward, and recover rapidly with counter-measures
Degrade failures with fallback mechanisms like returning response from the cache
Provide dashboard for monitoring purposes
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