go config_error ai_generated true

rpc error: code = AlreadyExists desc = duplicate registration of service pb.OrderService

ID: go/grpc-already-exists

Also available as: JSON · Markdown · 中文
80%Fix Rate
86%Confidence
0Evidence
2024-04-22First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
google.golang.org/grpc v1.46+ active — — —

Root Cause

RegisterOrderServiceServer was called twice on the same grpc.Server, or two server instances share a registry. gRPC panics on duplicate service registration.

generic

中文

在同一个 grpc.Server 上两次调用了 RegisterOrderServiceServer，或两个服务端实例共享了注册表。gRPC 在重复注册服务时会 panic。

Workarounds

  1. 95% success 
    s := grpc.NewServer()
pb.RegisterOrderServiceServer(s, svc)
// do not register again elsewhere
  2. 85% success 
    var once sync.Once
once.Do(func() { pb.RegisterOrderServiceServer(s, svc) })

Dead Ends

Common approaches that don't work:

  1. 80% fail

    Recovering hides the bug; the second registration still fails and the server state is inconsistent.

  2. 75% fail

    Multiple servers on one listener conflict; only one can bind the port, and requests route unpredictably.