Challenges of Microservices Architecture
Microservice architecture is more complex than the legacy system. The microservice environment becomes more complicated because the team has to manage and support many moving parts. Here are some of the top challenges that an organization face in their microservices journey:
- Bounded Context
- Dynamic Scale up and Scale Down
- Fault Tolerance
- Cyclic dependencies
- DevOps Culture
Bounded context: The bounded context concept originated in Domain-Driven Design (DDD) circles. It promotes the Object model first approach to service, defining a data model that service is responsible for and is bound to. A bounded context clarifies, encapsulates, and defines the specific responsibility to the model. It ensures that the domain will not be distracted from the outside. Each model must have a context implicitly defined within a sub-domain, and every context defines boundaries.
In other words, the service owns its data and is responsible for its integrity and mutability. It supports the most important feature of microservices, which is independence and decoupling.
Dynamic scale up and scale down: The loads on the different microservices may be at a different instance of the type. As well as auto-scaling up your microservice should auto-scale down. It reduces the cost of the microservices. We can distribute the load dynamically.
Monitoring: The traditional way of monitoring will not align well with microservices because we have multiple services making up the same functionality previously supported by a single application. When an error arises in the application, finding the root cause can be challenging.
Fault Tolerance: Fault tolerance is the individual service that does not bring down the overall system. The application can operate at a certain degree of satisfaction when the failure occurs. Without fault tolerance, a single failure in the system may cause a total breakdown. The circuit breaker can achieve fault tolerance. The circuit breaker is a pattern that wraps the request to external service and detects when they are faulty. Microservices need to tolerate both internal and external failure.
Cyclic Dependency: Dependency management across different services, and its functionality is very important. The cyclic dependency can create a problem, if not identified and resolved promptly.
DevOps Culture: Microservices fits perfectly into the DevOps. It provides faster delivery service, visibility across data, and cost-effective data. It can extend their use of containerization switch from Service-Oriented-Architecture (SOA) to Microservice Architecture (MSA).
Other challenges of microservices
- As we add more microservices, we have to be sure they can scale together. More granularity means more moving parts, which increase complexity.
- The traditional logging is ineffective because microservices are stateless, distributed, and independent. The logging must be able to correlate events across several platforms.
- When more services interact with each other, the possibility of failure also increases.