Clustering using query task in ArcGIS JSAPI 3.5

[SunilPalkar]

I am using query task to add clustering but it is not working. I am using 1000 points in my layer for clustering.

Please also give me idea if we have 1000000 (1 billion ) point for clustering.

My detail code is on JSFiddle (I have used arcgis sample server REST link instead of my REST link)

I am putting alerts in my code and its working but not displaying any points on map. So is clustering applicable for query layer?

Software's using : ESRI suit 10.1 (for Desktop and Server)