Changed defaults for akka to almost disable failure detector.

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

@@ -39,21 +39,22 @@ private[spark] object AkkaUtils {
     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", "60").toInt
+    val akkaTimeout = System.getProperty("spark.akka.timeout", "100").toInt
 
     val akkaFrameSize = System.getProperty("spark.akka.frameSize", "10").toInt
     val lifecycleEvents = if (System.getProperty("spark.akka.logLifecycleEvents", "false").toBoolean) "on" else "off"
 
-    val akkaHeartBeatPauses = System.getProperty("spark.akka.heartbeat.pauses", "60").toInt
+    val akkaHeartBeatPauses = System.getProperty("spark.akka.heartbeat.pauses", "600").toInt
     val akkaFailureDetector =
-      System.getProperty("spark.akka.failure-detector.threshold", "12.0").toDouble
-    val akkaHeartBeatInterval = System.getProperty("spark.akka.heartbeat.interval", "5").toInt 
+      System.getProperty("spark.akka.failure-detector.threshold", "300.0").toDouble
+    val akkaHeartBeatInterval = System.getProperty("spark.akka.heartbeat.interval", "1000").toInt
 
     val akkaConf = ConfigFactory.parseString(
       s"""
       |akka.daemonic = on
       |akka.loggers = [""akka.event.slf4j.Slf4jLogger""]
       |akka.stdout-loglevel = "ERROR"
+      |akka.jvm-exit-on-fatal-error = off
       |akka.remote.transport-failure-detector.heartbeat-interval = $akkaHeartBeatInterval s
       |akka.remote.transport-failure-detector.acceptable-heartbeat-pause = $akkaHeartBeatPauses s
       |akka.remote.transport-failure-detector.threshold = $akkaFailureDetector
@@ -61,6 +62,7 @@ private[spark] object AkkaUtils {
       |akka.remote.netty.tcp.transport-class = "akka.remote.transport.netty.NettyTransport"
       |akka.remote.netty.tcp.hostname = "$host"
       |akka.remote.netty.tcp.port = $port
+      |akka.remote.netty.tcp.tcp-nodelay = on
       |akka.remote.netty.tcp.connection-timeout = $akkaTimeout s
       |akka.remote.netty.tcp.maximum-frame-size = ${akkaFrameSize}MiB
       |akka.remote.netty.tcp.execution-pool-size = $akkaThreads