In Akka 2.0.2 authors change a procedure to set a load balance. Example to set router:

val system = ActorSystem("HarvestSystem")
val router = system.actorOf(Props[SiteTestActor].withRouter(RoundRobinRouter(nrOfInstances = testSiteWorkes)))
 
implicit val timeout = Timeout (10 seconds)
 
val countUrl=index.values.size
val countDownUrl = new CountDownLatch(countUrl)
 
var cnt=0
index.values.foreach(url =>{
 
Sys.info("HarvestActor::"+actorName,"Start site test "+cnt+": "+url.toString,4)
cnt+=1
 
val futureTest=router ask SiteTestRequest(url.toString,testKeyWord,countDownUrl)