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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.spark.deploy.client
import java.util.concurrent.TimeoutException
import scala.concurrent.Await
import scala.concurrent.duration._
import akka.actor._
import akka.pattern.ask
import akka.remote.{AssociationErrorEvent, DisassociatedEvent, RemotingLifecycleEvent}
import org.apache.spark.{Logging, SparkConf, SparkException}
import org.apache.spark.deploy.{ApplicationDescription, ExecutorState}
import org.apache.spark.deploy.DeployMessages._
import org.apache.spark.deploy.master.Master
import org.apache.spark.util.AkkaUtils
/**
* The main class used to talk to a Spark deploy cluster. Takes a master URL, an app description,
* and a listener for cluster events, and calls back the listener when various events occur.
*
* @param masterUrls Each url should look like spark://host:port.
*/
private[spark] class Client(
actorSystem: ActorSystem,
masterUrls: Array[String],
appDescription: ApplicationDescription,
listener: ClientListener,
conf: SparkConf)
extends Logging {
val REGISTRATION_TIMEOUT = 20.seconds
val REGISTRATION_RETRIES = 3
var masterAddress: Address = null
var actor: ActorRef = null
var appId: String = null
var registered = false
var activeMasterUrl: String = null
class ClientActor extends Actor with Logging {
var master: ActorSelection = null
var alreadyDisconnected = false // To avoid calling listener.disconnected() multiple times
var alreadyDead = false // To avoid calling listener.dead() multiple times
override def preStart() {
context.system.eventStream.subscribe(self, classOf[RemotingLifecycleEvent])
try {
registerWithMaster()
} catch {
case e: Exception =>
logWarning("Failed to connect to master", e)
markDisconnected()
context.stop(self)
}
}
def tryRegisterAllMasters() {
for (masterUrl <- masterUrls) {
logInfo("Connecting to master " + masterUrl + "...")
val actor = context.actorSelection(Master.toAkkaUrl(masterUrl))
actor ! RegisterApplication(appDescription)
}
}
def registerWithMaster() {
tryRegisterAllMasters()
import context.dispatcher
var retries = 0
lazy val retryTimer: Cancellable =
context.system.scheduler.schedule(REGISTRATION_TIMEOUT, REGISTRATION_TIMEOUT) {
retries += 1
if (registered) {
retryTimer.cancel()
} else if (retries >= REGISTRATION_RETRIES) {
logError("All masters are unresponsive! Giving up.")
markDead()
} else {
tryRegisterAllMasters()
}
}
retryTimer // start timer
}
def changeMaster(url: String) {
activeMasterUrl = url
master = context.actorSelection(Master.toAkkaUrl(activeMasterUrl))
masterAddress = activeMasterUrl match {
case Master.sparkUrlRegex(host, port) =>
Address("akka.tcp", Master.systemName, host, port.toInt)
case x =>
throw new SparkException("Invalid spark URL: " + x)
}
}
private def isPossibleMaster(remoteUrl: Address) = {
masterUrls.map(s => Master.toAkkaUrl(s))
.map(u => AddressFromURIString(u).hostPort)
.contains(remoteUrl.hostPort)
}
override def receive = {
case RegisteredApplication(appId_, masterUrl) =>
appId = appId_
registered = true
changeMaster(masterUrl)
listener.connected(appId)
case ApplicationRemoved(message) =>
logError("Master removed our application: %s; stopping client".format(message))
markDisconnected()
context.stop(self)
case ExecutorAdded(id: Int, workerId: String, hostPort: String, cores: Int, memory: Int) =>
val fullId = appId + "/" + id
logInfo("Executor added: %s on %s (%s) with %d cores".format(fullId, workerId, hostPort, cores))
listener.executorAdded(fullId, workerId, hostPort, cores, memory)
case ExecutorUpdated(id, state, message, exitStatus) =>
val fullId = appId + "/" + id
val messageText = message.map(s => " (" + s + ")").getOrElse("")
logInfo("Executor updated: %s is now %s%s".format(fullId, state, messageText))
if (ExecutorState.isFinished(state)) {
listener.executorRemoved(fullId, message.getOrElse(""), exitStatus)
}
case MasterChanged(masterUrl, masterWebUiUrl) =>
logInfo("Master has changed, new master is at " + masterUrl)
changeMaster(masterUrl)
alreadyDisconnected = false
sender ! MasterChangeAcknowledged(appId)
case DisassociatedEvent(_, address, _) if address == masterAddress =>
logWarning(s"Connection to $address failed; waiting for master to reconnect...")
markDisconnected()
case AssociationErrorEvent(cause, _, address, _) if isPossibleMaster(address) =>
logWarning(s"Could not connect to $address: $cause")
case StopClient =>
markDead()
sender ! true
context.stop(self)
}
/**
* Notify the listener that we disconnected, if we hadn't already done so before.
*/
def markDisconnected() {
if (!alreadyDisconnected) {
listener.disconnected()
alreadyDisconnected = true
}
}
def markDead() {
if (!alreadyDead) {
listener.dead()
alreadyDead = true
}
}
}
def start() {
// Just launch an actor; it will call back into the listener.
actor = actorSystem.actorOf(Props(new ClientActor))
}
def stop() {
if (actor != null) {
try {
val timeout = AkkaUtils.askTimeout(conf)
val future = actor.ask(StopClient)(timeout)
Await.result(future, timeout)
} catch {
case e: TimeoutException =>
logInfo("Stop request to Master timed out; it may already be shut down.")
}
actor = null
}
}
}
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