Why RPC Is the Hidden Backbone of Modern Enterprise Services

1. What Is RPC?

Remote Procedure Call (RPC) is a communication method used in distributed systems for more than 40 years. When two physically separated subsystems need to interact logically, RPC acts as the bridge. Alternatives include message queues, HTTP calls, databases, and distributed caches.

Unlike HTTP, traditional RPC uses long‑living connections, while HTTP typically uses short‑lived requests.

2. Nginx and RPC

Nginx is a widely used reverse proxy that provides load balancing for backend services. The interaction between Nginx and backend services can be viewed as RPC data exchange, even though it often uses HTTP or short‑lived connections.

Nginx can also communicate via binary protocols such as uWSGI and FastCGI, which are more bandwidth‑efficient than HTTP. uWSGI is common in Python deployments, while FastCGI is typical for PHP‑fpm.

3. Hadoop and RPC

In the big‑data domain, RPC is crucial because distributed nodes must communicate extensively. Hadoop’s HDFS, for example, uses a binary Hadoop RPC protocol between the NameNode and DataNodes.

4. TensorFlow and RPC

In artificial intelligence, TensorFlow relies on RPC for its distributed training clusters. The framework uses Google’s gRPC to coordinate computation across many nodes.

5. HTTP Calls as a Special Form of RPC

HTTP 1.0 uses short‑lived connections, while HTTP 1.1 introduced Keep‑Alive, making connections longer‑lived and narrowing the gap with RPC. With HTTP 2.0, Google released gRPC, a framework built on HTTP 2, effectively blurring the line between HTTP and RPC.

6. HTTP vs RPC (Mandarin vs Dialects)

Think of HTTP as Mandarin—universally understood but not the most efficient. RPC is like a regional dialect used within a company for high‑performance communication. Both coexist, but internal services benefit from the speed of RPC.

7. Looking at the World from Another Angle

If two processes run on the same OS instance, they can communicate via shared memory, semaphores, files, kernel message queues, or pipes—methods that bypass the network stack entirely.

In modern enterprises, single‑machine deployments are rare because they create single points of failure. Distributed solutions that rely on network communication, especially RPC, are essential for high availability.

8. Summary

Readers should now understand the pivotal role of RPC in internet‑scale enterprises and why a deep grasp of RPC is a key indicator of a senior backend engineer.

Next, we will explore the interaction principles of RPC in detail, laying a solid foundation before practical development.

9. Thought Exercise

Consider which other parts of backend development implicitly use “RPC‑like” techniques.