Microservices

What are the some of disadvantages of micro services?

• Coordination complexity
• As the micro service architecture comprises different services, communicating between them, these services become a little more complex.
• Increased development time
• Requires more complex architecture
• Set up new architecture
• Higher cost of implementation

Can we create micro services as state machines?

• Micro services are independent entities that solve a specific context.
• For that context, the micro service can work as a state machine.
• In a state machine, there are life cycle events that cause change in the state of the system.
• In a library, service, there is a book that changes state based on different events like procure a book, register a book, issue a book, return book, loser, book, lead to return of book, et cetera.
• These events and book can form a state machine for library micro service.

How we can use multiple databases in spring micro services?

• For different environment, we can use profile to use multiple databases.
• Multiple databases for single environment can be configured using Java configuration.
• We can have different data sources and object.
• We can have factory method Which will give us different object based on conditions.

How can we scale micro services?

• We can use Joule and Dribble to scale micro services.

What are some of the advantages of using micro services?

• Single chain of responsibility(Scale up) Is better.
• Easy to code and integrate.
• Deployment takes less time as only concerned micro service needs to be deployed.

How can we perform session management in micro services?

• We can use SAGA design pattern To perform session management in micro services.
• We can apply with choreography approach or orchestration approach.
• In choreography We can use event sourcing approach.
• We can also manage session using correlation ID between micro services using mapped diagnostics context.
• Asynchronous Session Can be managed using a broker like Kafka or Rabbit Mq etc.

What is Load Balancing?

• Load balancing means distributing your incoming request to multiple server instances.