How do I connect one service to another service in microservices?

There are two basic messaging patterns that microservices can use to communicate with other microservices.

1. Synchronous communication. In this pattern, a service calls an API that another service exposes, using a protocol such as HTTP or gRPC.
2. Asynchronous message passing.

How do microservices exchange data?

A basic principle of microservices is that each service manages its own data. Two services should not share a data store. Instead, each service is responsible for its own private data store, which other services cannot access directly.

How do microservices find each other?

Another communication pattern we can leverage in a microservice architecture is message-based communication. Unlike HTTP communication, the services involved do not directly communicate with each other. Instead, the services push messages to a message broker that other services subscribe to.

How does service discovery work in Microservices?

Microservices service discovery is a way for applications and microservices to locate each other on a network. Service discovery implementations within microservices architecture discovery includes both: a central server (or servers) that maintain a global view of addresses.

Why each Microservice should maintain its own data?

The main benefit of the microservice architecture is that it dramatically improves agility and velocity. In order to be able to independently develop microservices , they must be loosely coupled. Each microservice’s persistent data must be private to that service and only accessible via it’s API .

How do you achieve data consistency in microservices?

Consistency: all data in the database is consistent at the end of transaction. Isolation: only one transaction can touch the data in the same time, other transactions wait until completion of the working transaction. Durability: data is persisted in the database at the end of the transaction.

What is service discovery in Microservice?

Service discovery is how applications and (micro)services locate each other on a network. Implementations include both a central server(s) that maintain a global view of addresses and clients that connect to the central server to update and retrieve addresses.

What is service discovery in Microservices?

What kind of database should I use for my microservice?

For some services, a relational database is the best choice. Other services might need a NoSQL database such as MongoDB, which is good at storing complex, unstructured data, or Neo4J, which is designed to efficiently store and query graph data. Keep each microservice’s persistent data private to that service and accessible only via its API.

How is the view of a microservices project updated?

The view is updated by a service that subscribes to customer and order events. Microservices.io is brought to you by Chris Richardson. Experienced software architect, author of POJOs in Action, the creator of the original CloudFoundry.com, and the author of Microservices patterns.

What are the basic principles of microservices?

A basic principle of microservices is that each service manages its own data. Two services should not share a data store. Instead, each service is responsible for its own private data store, which other services cannot access directly.

How do I keep persistent data private in a microservice?

Keep each microservice’s persistent data private to that service and accessible only via its API. A service’s transactions only involve its database. The following diagram shows the structure of this pattern. The service’s database is effectively part of the implementation of that service. It cannot be accessed directly by other services.