Jan 4, Now let’s create an abstract class called “RetryMechanismBase“. C# .. Sefer ALGAN. Konuların Öneriniz için teşekkür ederim Sefer hocam. View Sefer Algan’s profile on LinkedIn, the world’s largest professional community. Sefer has 4 jobs listed on their profile. See the complete profile on LinkedIn and discover Sefer’s connections and jobs at similar companies. C# Türkiye. {bookName: “Holocoust Industry”, writer: “Norman Winkelstein”, stars: 5, suggest: true, bookColor: “green”}, {bookName: “C# “, writer: “Sefer Algan”, stars: 5.

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Obviously, I was planning to write an article on this topic. After my last blackfriday experience, I decided to write something about on this topic. Yes, the topic is the importance of resilience and fault tolerance in microservice architecture and how can we provide serer. In my previous articles, I have always mentioned about the advantages that the microservice architecture brings to the system.

If you are already reading this article, I guess, you already have an experience with the microservice architecture.

I have been working on the microservice architecture for the last 3 years. Yes, I am in that transformation world too. Life, we have already known that there is no such thing as a perfect.

Every perfect thing brings a new challenge for us.

We have already known and accepted all of the problems and responsibilities that comes with perfect things. Of course, sometimes we can not foresee these problems.

Anyway, actually the microservice architecture has happened to me like this. But we could not foresee some challenges. Yes, microservices are naturally resilient to some of the faults that can occur. When we looked at monolith applications, I guess it is not possible to ignore that the entire flow of the application is affected by a single error when an error occurs. If we think simple, we can give examples of these errors such as third-party APIs which do not respond, network splits, or no effective use of infrastructure resources.

Because of these reasons, we try to build our applications in small pieces and to make sure that the entire application flow is not affected from such errors. Thus we can provide a fault tolerance to these small pieces when any error occurs. In summary, with microservice approach, we have totally or partially prevented the entire system flow to affected by a single error.


Of course, this is just one of the advantages. With this class, we will get the options.


We defined states of the circuit breaker in the enum. We will use the other methods to update or delete the state of the function-based operation. Now we can look at the coding part of the circuit breaker. First, we look if the circuit breaker state for the corresponding function is open or not.

If it is not in open state, we invoke the corresponding function in the below try-catch block. If the exception threshold value is exceeded, the state of the circuit breaker will be opened and the date will be updated on the model.

At the end of the expire time we create a lock to understand if the errors are still ongoing instead of closing the circuit breaker. Then we execute the operation with a single thread once again. Thus we will ensure that infrastructure resources are not used algann and the application will be prevented from some cascading failures. In my opinion, retry operations are important, especially if we are working with remote resources.

In many cases, unsuccessful operations usually execute successfully in the second or third retries.

Especially in distributed systems, xefer operations are one of the best options that we can use against transient faults. We will use this class to get some parameters for retry operations. Also, we will handle back-offs in concrete classes. Now we can implement a retry strategy. Now we need a wrapper class to use retry operations simply. In a usage of the code sample above, if a web-based transient error sefed in the allgan, the operation will be retried 3 times with a 5-second interval.

Hence the corresponding request will not be lost immediately. I guess we can say that fallback is a backup strategy. In my opinion, if we design a microservice architecture, so fallback strategies are very important. Imagine that we are working on an e-commerce website.

So, what happens now? The system has retry alga and the payment operation still cannot be processed. In such situations, fallback strategies become more important. Summarize, fallback operations are what we decide to do when the services which we use are unavailable.

We looked at the circuit breaker, retry mechanism and fallback operations. Well, how can we use fallback operations with these patterns together?

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In the method above, we use the retry operations first. If any problem occurs, we send function delegate to the circuit breaker. In case of an exception in the circuit breaker, we use the fallback function.


For better illustration, I tried to draw a sequence diagram as follow. As I mentioned at the beginning of this article, I wanted to write this article for a long time. Now I finally did it. I hope, this article would help who needs any information about the resilience in a microservice architecture. I have tried to talk about the importance of applications with resilience and fault-tolerance when designing microservice architecture, also how to implement them.

As conclusion as in addition how we design our applications, designing resilience capabilities of our applications in unexpected situations is also very important. Your email address will not be published. This site uses Akismet to reduce spam. Learn how your comment data is processed. The story In my previous articles, I have always mentioned about the advantages that the microservice architecture brings to the system.

Importance of Circuit breaker We know that in microservice world, applications usually work together with one another or with some remote service.

So, this situation is inevitable when we face network splits, timeouts and transient errors. At this point, we need a circuit breaker to prevent the application from repeatedly trying to execute an operation, while an error occurs in the application. In this mode, the circuit breaker is not open and all requests are executed. Now the circuit breaker is open and it prevents the application from repeatedly trying to execute an operation while an error occurs.

In this mode, the circuit breaker executes a few operations to identify if an error still occurs. If errors alagn, then slgan circuit breaker will be opened, if not it will be closed. TryGetValue keyout stateModel. AddStateModel keystateModel.

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TryRemove keyout stateModel. TryAdd keycircuitBreakerStateModel. Keyex. SetLastException keyex. If retry mechanism uses If circuit breaker uses January 4, Reply. January 6, Reply. January 9, Reply. July 11, Reply. July 19, Reply. Leave a Reply Cancel reply Your email address will not be published.