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package spark.deploy.client
import spark.deploy._
import akka.actor._
import akka.pattern.ask
import akka.util.duration._
import akka.pattern.AskTimeoutException
import spark.{SparkException, Logging}
import akka.remote.RemoteClientLifeCycleEvent
import akka.remote.RemoteClientShutdown
import spark.deploy.RegisterJob
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, a job description,
* and a listener for job events, and calls back the listener when various events occur.
*/
private[spark] class Client(
actorSystem: ActorSystem,
masterUrl: String,
jobDescription: JobDescription,
listener: ClientListener)
extends Logging {
val MASTER_REGEX = "spark://([^:]+):([0-9]+)".r
var actor: ActorRef = null
var jobId: String = null
if (MASTER_REGEX.unapplySeq(masterUrl) == None) {
throw new SparkException("Invalid master URL: " + masterUrl)
}
class ClientActor extends Actor with Logging {
var master: ActorRef = null
var alreadyDisconnected = false // To avoid calling listener.disconnected() multiple times
override def preStart() {
val Seq(masterHost, masterPort) = MASTER_REGEX.unapplySeq(masterUrl).get
logInfo("Connecting to master spark://" + masterHost + ":" + masterPort)
val akkaUrl = "akka://spark@%s:%s/user/Master".format(masterHost, masterPort)
try {
master = context.actorFor(akkaUrl)
master ! RegisterJob(jobDescription)
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 RegisteredJob(jobId_) =>
jobId = jobId_
listener.connected(jobId)
case ExecutorAdded(id: Int, workerId: String, host: String, cores: Int, memory: Int) =>
val fullId = jobId + "/" + id
logInfo("Executor added: %s on %s (%s) with %d cores".format(fullId, workerId, host, cores))
listener.executorAdded(fullId, workerId, host, cores, memory)
case ExecutorUpdated(id, state, message) =>
val fullId = jobId + "/" + 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(""))
}
case Terminated(_) | RemoteClientDisconnected(_, _) | RemoteClientShutdown(_, _) =>
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 = 1.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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