go data_error ai_generated true

error: unknown field "new_field" in google.protobuf.Struct

ID: go/grpc-unknown-protobuf-field

Also available as: JSON · Markdown · 中文
80%Fix Rate
85%Confidence
0Evidence
2024-02-15First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
1.0 active — — —
1.1 active — — —

Root Cause

The client or server is sending a protobuf message with a field that was added in a newer version of the .proto file, but the receiving side is using an older compiled version that doesn't know about it.

generic

中文

客户端或服务器发送的 protobuf 消息包含较新版本 .proto 文件中新增的字段，但接收方使用的是旧编译版本，无法识别该字段。

Workarounds

  1. 95% success Regenerate the protobuf code with the latest .proto file 
    protoc --go_out=. --go-grpc_out=. your.proto
  2. 85% success Enable protobuf unknown field preservation to avoid errors 
    import "google.golang.org/protobuf/proto"
// Use proto.UnmarshalOptions{DiscardUnknown: true} when unmarshaling

Dead Ends

Common approaches that don't work:

  1. Ignore the error and hope the message is processed successfully 90% fail

    The error is returned by the protobuf unmarshaller, so the message is discarded entirely, and the RPC fails.

  2. Manually parse the JSON representation instead of using protobuf 70% fail

    This bypasses the type safety and can lead to data corruption or security issues, and still won't resolve the unknown field error.