private void serialize(final DataOutputStream stream) throws IOException {
    ReadWriteIOUtils.write(requestType, stream);
    payload.serialize(stream);
    ReadWriteIOUtils.write(timeoutMs, stream);
    ReadWriteIOUtils.write(maxBytes, stream);
  }
The maximum size, in bytes, for the response payload.
iotdb-client/service-rpc/src/main/java/org/apache/iotdb/rpc/subscription/payload/poll/SubscriptionPollRequest.java