Cracking Microservices Architecture Java Interviews: A handbook for Java & Spring developers by Munish Chandel

Author:Munish Chandel [Chandel, Munish]
Language: eng
Format: azw3
Publisher: Shunya Foundation
Published: 2018-02-26T16:00:00+00:00

What is Circuit Breaker?

Circuit breaker is used to gracefully degrade the functionality when one of the service/method call fails, without cascading the effect that can bring down the entire system.

The logic of Circuit Breaker is quite simple -.

Wrap a protected (mostly remote) call inside a circuit breaker object, which monitors for failures. Once the failures reach a certain threshold, trip the circuit and immediately return the error (or fallback response) without even making a actual remote call, thus giving failing service time to recover.

How it helps?.

If many of the caller threads are being timeout on a failed resource, we may quickly exhaust all our threads and the caller application will also get impacted due to this. Such failure can cascade and bring down the entire system. Circuit breaker does not allow this to happen by tripping off the circuits that are potentially failing. We achieve this fault-tolerance at the expense of degraded functionality.

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