Problems

● Cross-Service Queries with Complex JOINs

● Return Sync Response with low latency

● Provide loosely coupling with decouple services

● Reduce inter-service communication

SOLVE ALL PROBLEMS AT THE SAME TIME !

Considerations

● Sync Communication: Use Service Aggregator Pattern but it increase coupling and latency.

● Async Communication: Provide decoupling but query request are waiting immediate response.

Solutions

● Materialized View Pattern

● CQRS Design Pattern 

https://learn.microsoft.com/en-us/dotnet/architecture/microservices/architect-microservice-container-applications/communication-in-microservice-architecture