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UNIn the simplest way 👇🏻
It’s not about one best option, itself about requirements.
In a microservices architecture, services don’t share databases.
They communicate using APIs, events, or RPC calls.
Common ways microservices communicate:
1️⃣ Synchronous (REST / HTTP)
👉 Service A calls Service B and waits for a response
Use when: Immediate response is required
Example: Order Service → Payment Service
2️⃣ Asynchronous (Message Queue / Events)
👉 Service A sends a message and continues
Use when: Reliability & scalability matter
Example: Order placed → inventory, payment, notification react later
3️⃣ Event-Driven Communication
👉 Services react to events instead of calling each other directly
Use when: Many services depend on the same action
Example:
“User signed up” → welcome email, notifications, rewards
4️⃣ gRPC (Binary, Fast Calls)
👉 Faster, structured communication between internal services
Use when: Services talk frequently and performance matters
Example: Pricing service calling discount service hundreds of times per second
📌 Interview tip:
Microservices prefer loose coupling, not tight dependencies.
Save this for your future interviews!
#development #grpc #systemdesign #java #foryou
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