Why RPC Is Essential for Building Scalable IM Clusters: A Beginner’s Guide
This article explains the fundamentals of Remote Procedure Call (RPC), why it is crucial for developing production‑grade instant‑messaging clusters, how it differs from plain HTTP, the typical RPC call flow, common frameworks such as gRPC, Thrift and Dubbo, and practical considerations for high‑throughput distributed systems.
1. Introduction
Developers often wonder why they need an IM cluster when a single machine can handle modest traffic; however, when user numbers reach millions, a scalable cluster becomes necessary. Building a production‑grade IM cluster is challenging because instant messaging relies on long‑living connections, unlike traditional short‑lived HTTP requests.
We illustrate the message flow with two users (A and B) connected to different IM instances. The message must travel from instance 1 to instance 2 before reaching the recipient.
1) User A sends a message to IM instance 1.
2) Instance 1 forwards the message to instance 2.
3) Instance 2 delivers the message to user B.
The critical step is step 2, which is handled by RPC technology.
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