title: What is the most efficient way to pass data (list of pairs of [Integer + Double]) between two Google App Engine instances?
body: <p>What is the most efficient way to pass data (list of pairs of [Integer, Double]) between two Google App Engine instances ?</p>
  
  <p>Currently I use Java binary serialization. Frontend servlet receives data from the client in JSON format. I convert it to <code>byte[]</code> using <code>ObjectOutput.writeObject</code> and then send it to backend servlet via HTTP POST. It's not in production yet.</p>
  
  <p>Should I just pass client's JSON as it is to backend? It seems more logical. But it's bigger in size.</p>
  
  <p>Or should I use Google Protocol Buffers as stated in <strong><a href="http://www.eishay.com/2009/03/more-on-benchmarking-java-serialization.html" rel="nofollow">this benchmark article</a></strong> ?</p>
  
  <p>Thank you!!!</p>