Java NANO_RUNTIME does not support services
解决：protoc –javanano_out=ignore_services=true:. helloworld.proto
io.grpc.StatusRuntimeException: INTERNAL: Too many responses
io.grpc.StatusRuntimeException: CANCELLED: HTTP/2 error code: CANCEL
The problem has been solved, and the problem is caused by the server. The queue size of grpc server’s thread pool is too small, resulting in tasks submit failed. the server throw exception below: