GRPC java 雙向流式服務，直接內存溢出解決

客戶端解決：

public class ManualFlowControlClient {
    private static final Logger logger =
        Logger.getLogger(ManualFlowControlClient.class.getName());

  public static void main(String[] args) throws InterruptedException {
    final CountDownLatch done = new CountDownLatch(1);

    // Create a channel and a stub
    ManagedChannel channel = ManagedChannelBuilder
        .forAddress("localhost", 50051)
        .usePlaintext()
        .build();
    StreamingGreeterGrpc.StreamingGreeterStub stub = StreamingGreeterGrpc.newStub(channel);

    // When using manual flow-control and back-pressure on the client, the ClientResponseObserver handles both
    // request and response streams.
    ClientResponseObserver<HelloRequest, HelloReply> clientResponseObserver =
        new ClientResponseObserver<HelloRequest, HelloReply>() {

          ClientCallStreamObserver<HelloRequest> requestStream;

          @Override
          public void beforeStart(final Cl