RESOURCE_EXHAUSTED communication protocol_error ai_generated true

grpc::RpcError: message too large (exceeds 4 MB limit)

ID: communication/grpc-message-size-exceeded

Also available as: JSON · Markdown · 中文
85%Fix Rate
85%Confidence
1Evidence
2023-04-15First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
gRPC 1.48.0 active — — —
gRPC 1.50.0 active — — —
gRPC 1.54.0 active — — —

Root Cause

gRPC default maximum message size is 4 MB for both send and receive; any message exceeding this limit causes a RpcError.

generic

中文

gRPC 默认的最大消息大小为 4 MB（发送和接收均适用），任何超过此限制的消息都会导致 RpcError。

Official Documentation

https://grpc.io/docs/guides/performance/#message-size

Workarounds

  1. 95% success Increase max message size on both client and server: server: server = grpc.server(futures.ThreadPoolExecutor(max_workers=10), options=[('grpc.max_send_message_length', 10 * 1024 * 1024), ('grpc.max_receive_message_length', 10 * 1024 * 1024)]) client: channel = grpc.insecure_channel('localhost:50051', options=[('grpc.max_send_message_length', 10 * 1024 * 1024), ('grpc.max_receive_message_length', 10 * 1024 * 1024)]) 
    Increase max message size on both client and server: server: server = grpc.server(futures.ThreadPoolExecutor(max_workers=10), options=[('grpc.max_send_message_length', 10 * 1024 * 1024), ('grpc.max_receive_message_length', 10 * 1024 * 1024)]) client: channel = grpc.insecure_channel('localhost:50051', options=[('grpc.max_send_message_length', 10 * 1024 * 1024), ('grpc.max_receive_message_length', 10 * 1024 * 1024)])
  2. 85% success Split the large payload into multiple smaller messages using client-side chunking, then reassemble on server 
    Split the large payload into multiple smaller messages using client-side chunking, then reassemble on server
  3. 90% success Use gRPC streaming (server-side or bidirectional) to send data in chunks without changing limits 
    Use gRPC streaming (server-side or bidirectional) to send data in chunks without changing limits

中文步骤

  1. Increase max message size on both client and server: server: server = grpc.server(futures.ThreadPoolExecutor(max_workers=10), options=[('grpc.max_send_message_length', 10 * 1024 * 1024), ('grpc.max_receive_message_length', 10 * 1024 * 1024)]) client: channel = grpc.insecure_channel('localhost:50051', options=[('grpc.max_send_message_length', 10 * 1024 * 1024), ('grpc.max_receive_message_length', 10 * 1024 * 1024)])
  2. Split the large payload into multiple smaller messages using client-side chunking, then reassemble on server
  3. Use gRPC streaming (server-side or bidirectional) to send data in chunks without changing limits

Dead Ends

Common approaches that don't work:

  1. 95% fail

    Server still enforces default limit, so server-side deserialization fails

  2. 70% fail

    gRPC compression reduces wire size but server still checks uncompressed size

  3. 60% fail

    Streaming works but requires protocol change and breaks existing clients; not a direct fix