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    • Home

    Upstream Service

    Published Mar 13, 2025 [  Network  ]

    An upstream service is a service that another service (the downstream service) depends on or receives data from. The term is commonly used in distributed systems, microservices, and networking.

    Key Concepts:

    1. Data Flow Perspective

      • Upstream Service: Sends data or performs operations that another service relies on.
      • Downstream Service: Receives data or responses from the upstream service.

    2. Examples in Different Contexts

      • Microservices:
        • A payment service (downstream) may call an authentication service (upstream) to verify user credentials.
      • Networking:
        • A web browser (downstream) requests data from a web server (upstream).
      • APIs:
        • A frontend app (downstream) fetches data from a backend API (upstream).

    3. Failure Propagation

      • If an upstream service fails, downstream services may be affected unless they have fallback mechanisms (like caching or retries).