Made Akka timeout and message frame size configurable, and upped the defaults

core/src/main/scala/spark/util/AkkaUtils.scala

@@ -25,6 +25,8 @@ private[spark] object AkkaUtils {
   def createActorSystem(name: String, host: String, port: Int): (ActorSystem, Int) = {
     val akkaThreads = System.getProperty("spark.akka.threads", "4").toInt
     val akkaBatchSize = System.getProperty("spark.akka.batchSize", "15").toInt
+    val akkaTimeout = System.getProperty("spark.akka.timeout", "20").toInt
+    val akkaFrameSize = System.getProperty("spark.akka.frameSize", "10").toInt
     val akkaConf = ConfigFactory.parseString("""
       akka.daemonic = on
       akka.event-handlers = ["akka.event.slf4j.Slf4jEventHandler"]
@@ -32,10 +34,11 @@ private[spark] object AkkaUtils {
       akka.remote.transport = "akka.remote.netty.NettyRemoteTransport"
       akka.remote.netty.hostname = "%s"
       akka.remote.netty.port = %d
-      akka.remote.netty.connection-timeout = 1s
+      akka.remote.netty.connection-timeout = %ds
+      akka.remote.netty.message-frame-size = %d MiB
       akka.remote.netty.execution-pool-size = %d
       akka.actor.default-dispatcher.throughput = %d
-      """.format(host, port, akkaThreads, akkaBatchSize))
+      """.format(host, port, akkaTimeout, akkaFrameSize, akkaThreads, akkaBatchSize))
 
     val actorSystem = ActorSystem("spark", akkaConf, getClass.getClassLoader)