@Override
  public void sendRequest(
      final DiscoveryNode node,
      final long requestId,
      final String action,
      final TransportRequest request,
      TransportRequestOptions options)
      throws IOException, TransportException {
    final Version version = Version.smallest(node.getVersion(), this.version);

    try (BytesStreamOutput stream = new BytesStreamOutput()) {
      stream.setVersion(version);

      stream.writeLong(requestId);
      byte status = 0;
      status = TransportStatus.setRequest(status);
      stream.writeByte(status); // 0 for request, 1 for response.

      threadPool.getThreadContext().writeTo(stream);
      stream.writeString(action);
      request.writeTo(stream);

      stream.close();

      final LocalTransport targetTransport = connectedNodes.get(node);
      if (targetTransport == null) {
        throw new NodeNotConnectedException(node, "Node not connected");
      }

      final byte[] data = stream.bytes().toBytes();
      transportServiceAdapter.sent(data.length);
      transportServiceAdapter.onRequestSent(node, requestId, action, request, options);
      targetTransport
          .workers()
          .execute(
              () -> {
                ThreadContext threadContext = targetTransport.threadPool.getThreadContext();
                try (ThreadContext.StoredContext context = threadContext.stashContext()) {
                  targetTransport.messageReceived(
                      data, action, LocalTransport.this, version, requestId);
                }
              });
    }
  }
 @Override
 public void writeComplete(ChannelHandlerContext ctx, WriteCompletionEvent e) throws Exception {
   transportServiceAdapter.sent(e.getWrittenAmount());
   super.writeComplete(ctx, e);
 }