Amazon DevOps Engineer System Design Questions

In Amazon, ensuring the health and performance of microservices is vital for maintaining the user experience. You are tasked with designing a ServiceHealthMonitor class that keeps track of the health status of various services.Class: ServiceHealthMonitor
- Method: report_health(service_name: str, status: bool) -> None — Updates the health status for the given service.
- Method: get_health(service_name: str) -> bool — Returns the current health status of the specified service.Example 1:
Input: service_name="serviceA", status=true
Output: None
Explanation: Successfully reported serviceA as healthy.Example 2:
Input: service_name="serviceA"
Output: true
Explanation: The current health status of serviceA is healthy.Constraints:
- The service_name can be up to 50 characters long.
- Health statuses are updated at most every minute.

In Amazon, managing configurations for numerous services is a challenge that must be handled efficiently. This design involves creating a class for a DistributedConfigManager that allows various services to fetch their configurations dynamically.Class: DistributedConfigManager
- Method: get_config(service_name: str) -> Dict[str, Any] — Fetches the configuration for the given service.
- Method: set_config(service_name: str, config: Dict[str, Any]) -> bool — Sets the configuration for the specified service and returns success status.Example 1:
Input: service_name="serviceA"
Output: { "timeout": 30, "retry": 5 }
Explanation: The configuration for serviceA is fetched successfully from the centralized manager.Example 2:
Input: service_name="serviceB"
Output: True
Explanation: The configuration for serviceB has been set successfully.Constraints:
- The service_name length must be ≤ 50 characters.
- Config values can be any valid JSON structure up to a depth of 10.