NCBC-146: Randomly select a node to handle view requests

Change-Id: I12824c4ff63a1fd3b6f7a82d20c12d11c36b43e8
Reviewed-on: http://review.couchbase.org/21895
Reviewed-by: Jasdeep Jaitla <jasdeep@couchbase.com>
Tested-by: John C. Zablocki <john@couchbase.com>

src/Couchbase/CouchbaseClient.cs

@@ -736,8 +736,10 @@ private void getViewSetup(ref string designName, ref string viewName)
 
 		IHttpClient IHttpClientLocator.Locate(string designDocument)
 		{
-			// find the node hosting this design document
-			var node = this.Pool.Locate(designDocument) as CouchbaseNode;
+			//pick a node at random to avoid overloading a single node with view requests
+			var nodes = this.Pool.GetWorkingNodes().ToArray();
+			var idx = new Random(Environment.TickCount).Next(nodes.Length);
+			var node = nodes[idx] as CouchbaseNode;
 
 			// return null if the node is dead
 			return (node != null && node.IsAlive)