Stateless microservices are one of the most important things to take into consideration when designing a cloud-native solution for stateless microservices that are cheap, easy to develop, and highly scalable. For small businesses and start-ups cost and human resources (management) is a very important factor. Stateless microservices can help reduce cost and management overheads to a great level. Let’s take a look at how stateless microservices can help small businesses and start-ups to accelerate their software development projects.
Stateless vs Stateful microservice architecture.
Fast build, test, and deployment
The microservices architectures allow the applications to be built as a composition of independent services. These services are isolated and do not depend on other services. This accelerates the overall development process as the architectures make it possible to build, test, and deploy the individual services without having any impact on the respective build, test, and deployment process of other services. The modularity of the application helps in the parallel development of the application and hence accelerates the speed of the development lifecycle. Instead of making big changes at a slow pace, the microservice architecture enables the developers to make small changes at a fast pace.
Resilience and quick Recovery
The acceleration, however, is affected if the microservices are stateful i.e. if the microservice maintains some state information to process the requests. In this case, if the microservice fails, then the state is lost and hence it cannot continue from the same point, where it failed, this can affect the system, however, if the service is stateless this will never impact the application, the microservice can fail and later restart the normal operation without impacting the system. Stateless microservices do not maintain any state information within the service calls. They simply accept a request, process it, and send the response back, a stateful service, however, maintains some state information which it needs to process the subsequent requests from a user.
The stateless microservices are very similar to the serverless framework in the cloud. They share many characteristics and underlying benefits. Like serverless the stateless microservices are quiescent, meaning that microservice has no information when it starts, also it does not needs any information which it will use to respond or run in a particular manner. So, it is pretty much guaranteed that the microservice will run in the same way for each invocation. This is helpful when you want to share something. Statelessness makes sure that the service run’s the same for each recipient. One additional benefit of being quiescent is cost-saving because of reduced consumption of resources.
The stateless microservice enables horizontal scaling as the service can add additional threads to scale to the requests as it does not needs any state information and hence each thread can start processing the requests independently. Stateless microservices are also advantageous for load balancing purposes. When maintaining the state(stateful microservice) the application needs to stick the stateful requests to the same server and hence need’s to configure the sticky session on the load balancer, which defeats the purpose of load balancing, stateless microservices, however, don’t need sticky session and hence the load balancing can be effectively done. This makes stateless microservice’s most fault-tolerant and highly available.