Microservices Service Discovery and Registry 3

Question 1

In the self-registration pattern, who registers a service instance with the registry?

Accepted Answer

The service instance itself

Answer

With self-registration, each instance is responsible for registering and deregistering itself.

Question 2

In the third-party registration pattern, registration is handled by:

Accepted Answer

A separate registrar (service manager) that tracks instances

Answer

A dedicated registrar component watches instances and registers/deregisters them.

Question 3

A key advantage of third-party registration is that:

Accepted Answer

Services contain no registration code

Answer

Decoupling registration from service code keeps services focused on business logic.

Question 4

How does a registry typically detect that an instance has died without deregistering?

Accepted Answer

Through health checks or heartbeat timeouts

Answer

Missed heartbeats or failed health checks cause the registry to expire stale entries.

Question 5

What is a 'heartbeat' in the context of a service registry?

Accepted Answer

A periodic signal an instance sends to renew its registration

Answer

Heartbeats are periodic renewals that tell the registry an instance is still healthy.

Microservices Practice Test