# grpc::RPC_STATUS_RESOURCE_EXCEEDED: Received message larger than max (N vs. M)

- **ID:** `communication/grpc-max-message-size-exceeded`
- **Domain:** communication
- **Category:** resource_error
- **Error Code:** `8`
- **Verification:** ai_generated
- **Fix Rate:** 85%

## Root Cause

gRPC message size exceeds the configured maximum (default 4 MB), causing server to reject the payload.

## Version Compatibility

| Version | Status | Introduced | Deprecated |
|---------|--------|------------|------------|
| gRPC Go v1.62.0 | active | — | — |
| gRPC Python v1.60.0 | active | — | — |
| gRPC Java v1.61.0 | active | — | — |

## Workarounds

1. **Increase max message size on both client and server. In Go: server := grpc.NewServer(grpc.MaxRecvMsgSize(50*1024*1024)); conn, _ := grpc.Dial(address, grpc.WithDefaultCallOptions(grpc.MaxCallRecvMsgSize(50*1024*1024)))** (95% success)
   ```
   Increase max message size on both client and server. In Go: server := grpc.NewServer(grpc.MaxRecvMsgSize(50*1024*1024)); conn, _ := grpc.Dial(address, grpc.WithDefaultCallOptions(grpc.MaxCallRecvMsgSize(50*1024*1024)))
   ```
2. **Split large payloads into multiple smaller gRPC messages or use streaming (e.g., server-streaming RPC) to send chunks.** (90% success)
   ```
   Split large payloads into multiple smaller gRPC messages or use streaming (e.g., server-streaming RPC) to send chunks.
   ```

## Dead Ends

- **Compress the message with gzip at application level only** — gRPC already supports compression; double compression can cause overhead without fixing the size limit if the uncompressed size is checked. (50% fail)
- **Increase server memory or swap** — The error is a hard limit on message size, not a memory shortage; increasing memory does not change the limit. (90% fail)