text: //
  // Tests mongos-only query behavior
  //
  
  var st = new ShardingTest({shards : 1,
                             mongos : 1,
                             verbose : 0});
  
  var mongos = st.s0;
  var coll = mongos.getCollection("foo.bar");
  
  //
  //
  // Ensure we can't use exhaust option through mongos
  coll.remove({});
  assert.writeOK(coll.insert({a : 'b'}));
  var query = coll.find({});
  assert.neq(null, query.next());
  query = coll.find({}).addOption(DBQuery.Option.exhaust);
  assert.throws(function(){ query.next(); });
  
  //
  //
  // Ensure we can't trick mongos by inserting exhaust option on a command through mongos
  coll.remove({});
  assert.writeOK(coll.insert({a : 'b'}));
  var cmdColl = mongos.getCollection(coll.getDB().toString() + ".$cmd");
  var cmdQuery = cmdColl.find({ ping : 1 }).limit(1);
  assert.commandWorked(cmdQuery.next());
  cmdQuery = cmdColl.find({ ping : 1 }).limit(1).addOption(DBQuery.Option.exhaust);
  assert.throws(function(){ cmdQuery.next(); });
  
  jsTest.log("DONE!");
  
  st.stop();
  