Experience with Google App Engine Data Store

Tried the Google's cloud platform with a simple example to store data.

package com.musugundan;

import java.io.IOException;
import java.util.Date;

import javax.jdo.PersistenceManager;
import javax.servlet.http.*;

@SuppressWarnings("serial")
public class MusugundanServlet extends HttpServlet {
 public void doGet(HttpServletRequest req, HttpServletResponse resp)
   throws IOException {
  resp.setContentType("text/plain");
  resp.addHeader("Refresh", "0; URL=/musugundan");
  resp.getWriter().println("Adding 100 records, Starting time " + new Date());
  PersistenceManager pm = PMF.get().getPersistenceManager();
  resp.flushBuffer();
        // 
                int maxrecords = 1000;
  for(long i=1;i<1000; i++)
  {
   Agent ag = new Agent("firstname" + i ,"lastname" + i,new Date());
   resp.getWriter().println("Writing Record :" + i );
   resp.flushBuffer();
            pm.makePersistent(ag);
  }    
        resp.getWriter().println("Added 100  records, Ending time " + new Date());
        resp.flushBuffer();
 }
}

When I set the maxrecords to 1000. It is error always. Means I cannot create 1000 records at a stretch.

I changed to 100. The timing went to 12 seconds to 25 seconds.

Change it to 1 and open multiple browsers with the instance of 100. It went on smoothly. Creating single record in a single request is pretty fast.

In Cloud computing make big things in a simpler way. That way it can work fast for its distributed nature of resources.