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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 spark.deploy.client
import spark.deploy._
import akka.actor._
import akka.pattern.ask
import akka.util.Duration
import akka.util.duration._
import akka.pattern.AskTimeoutException
import spark.{SparkException, Logging}
import akka.remote.RemoteClientLifeCycleEvent
import akka.remote.RemoteClientShutdown
import spark.deploy.RegisterApplication
import spark.deploy.master.Master
import akka.remote.RemoteClientDisconnected
import akka.actor.Terminated
import akka.dispatch.Await
/**
* 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.
*/
private[spark] class Client(
actorSystem: ActorSystem,
masterUrl: String,
appDescription: ApplicationDescription,
listener: ClientListener)
extends Logging {
var actor: ActorRef = null
var appId: String = null
class ClientActor extends Actor with Logging {
var master: ActorRef = null
var masterAddress: Address = null
var alreadyDisconnected = false // To avoid calling listener.disconnected() multiple times
override def preStart() {
logInfo("Connecting to master " + masterUrl)
try {
master = context.actorFor(Master.toAkkaUrl(masterUrl))
masterAddress = master.path.address
master ! RegisterApplication(appDescription)
context.system.eventStream.subscribe(self, classOf[RemoteClientLifeCycleEvent])
context.watch(master) // Doesn't work with remote actors, but useful for testing
} catch {
case e: Exception =>
logError("Failed to connect to master", e)
markDisconnected()
context.stop(self)
}
}
override def receive = {
case RegisteredApplication(appId_) =>
appId = appId_
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 Terminated(actor_) if actor_ == master =>
logError("Connection to master failed; stopping client")
markDisconnected()
context.stop(self)
case RemoteClientDisconnected(transport, address) if address == masterAddress =>
logError("Connection to master failed; stopping client")
markDisconnected()
context.stop(self)
case RemoteClientShutdown(transport, address) if address == masterAddress =>
logError("Connection to master failed; stopping client")
markDisconnected()
context.stop(self)
case StopClient =>
markDisconnected()
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 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 = Duration.create(System.getProperty("spark.akka.askTimeout", "10").toLong, "seconds")
val future = actor.ask(StopClient)(timeout)
Await.result(future, timeout)
} catch {
case e: AskTimeoutException => // Ignore it, maybe master went away
}
actor = null
}
}
}
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