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package spark.deploy.master
import scala.collection.mutable.{ArrayBuffer, HashMap, HashSet}
import akka.actor._
import spark.{Logging, Utils}
import spark.util.AkkaUtils
import java.text.SimpleDateFormat
import java.util.Date
import akka.remote.RemoteClientLifeCycleEvent
import spark.deploy._
import akka.remote.RemoteClientShutdown
import akka.remote.RemoteClientDisconnected
import spark.deploy.RegisterWorker
import spark.deploy.RegisterWorkerFailed
import akka.actor.Terminated
class Master(ip: String, port: Int, webUiPort: Int) extends Actor with Logging {
val DATE_FORMAT = new SimpleDateFormat("yyyyMMddHHmmss") // For job IDs
var nextJobNumber = 0
val workers = new HashSet[WorkerInfo]
val idToWorker = new HashMap[String, WorkerInfo]
val actorToWorker = new HashMap[ActorRef, WorkerInfo]
val addressToWorker = new HashMap[Address, WorkerInfo]
val jobs = new HashSet[JobInfo]
val idToJob = new HashMap[String, JobInfo]
val actorToJob = new HashMap[ActorRef, JobInfo]
val addressToJob = new HashMap[Address, JobInfo]
val waitingJobs = new ArrayBuffer[JobInfo]
val completedJobs = new ArrayBuffer[JobInfo]
override def preStart() {
logInfo("Starting Spark master at spark://" + ip + ":" + port)
// Listen for remote client disconnection events, since they don't go through Akka's watch()
context.system.eventStream.subscribe(self, classOf[RemoteClientLifeCycleEvent])
startWebUi()
}
def startWebUi() {
val webUi = new MasterWebUI(context.system, self)
try {
AkkaUtils.startSprayServer(context.system, "0.0.0.0", webUiPort, webUi.handler)
} catch {
case e: Exception =>
logError("Failed to create web UI", e)
System.exit(1)
}
}
override def receive = {
case RegisterWorker(id, host, workerPort, cores, memory) => {
logInfo("Registering worker %s:%d with %d cores, %s RAM".format(
host, workerPort, cores, Utils.memoryMegabytesToString(memory)))
if (idToWorker.contains(id)) {
sender ! RegisterWorkerFailed("Duplicate worker ID")
} else {
addWorker(id, host, workerPort, cores, memory)
context.watch(sender) // This doesn't work with remote actors but helps for testing
sender ! RegisteredWorker
schedule()
}
}
case RegisterJob(description) => {
logInfo("Registering job " + description.name)
val job = addJob(description, sender)
logInfo("Registered job " + description.name + " with ID " + job.id)
waitingJobs += job
context.watch(sender) // This doesn't work with remote actors but helps for testing
sender ! RegisteredJob(job.id)
schedule()
}
case ExecutorStateChanged(jobId, execId, state, message) => {
val execOption = idToJob.get(jobId).flatMap(job => job.executors.get(execId))
execOption match {
case Some(exec) => {
exec.state = state
exec.job.actor ! ExecutorUpdated(execId, state, message)
if (ExecutorState.isFinished(state)) {
// Remove this executor from the worker and job
logInfo("Removing executor " + exec.fullId + " because it is " + state)
idToJob(jobId).removeExecutor(exec)
exec.worker.removeExecutor(exec)
// TODO: the worker would probably want to restart the executor a few times
schedule()
}
}
case None =>
logWarning("Got status update for unknown executor " + jobId + "/" + execId)
}
}
case Terminated(actor) => {
// The disconnected actor could've been either a worker or a job; remove whichever of
// those we have an entry for in the corresponding actor hashmap
actorToWorker.get(actor).foreach(removeWorker)
actorToJob.get(actor).foreach(removeJob)
}
case RemoteClientDisconnected(transport, address) => {
// The disconnected client could've been either a worker or a job; remove whichever it was
addressToWorker.get(address).foreach(removeWorker)
addressToJob.get(address).foreach(removeJob)
}
case RemoteClientShutdown(transport, address) => {
// The disconnected client could've been either a worker or a job; remove whichever it was
addressToWorker.get(address).foreach(removeWorker)
addressToJob.get(address).foreach(removeJob)
}
}
/**
* Schedule the currently available resources among waiting jobs. This method will be called
* every time a new job joins or resource availability changes.
*/
def schedule() {
// Right now this is a very simple FIFO scheduler. We keep looking through the jobs
// in order of submission time and launching the first one that fits on each node.
for (worker <- workers if worker.coresFree > 0) {
for (job <- waitingJobs.clone()) {
val jobMemory = job.desc.memoryPerSlave
if (worker.memoryFree >= jobMemory) {
val coresToUse = math.min(worker.coresFree, job.coresLeft)
val exec = job.addExecutor(worker, coresToUse)
launchExecutor(worker, exec)
}
if (job.coresLeft == 0) {
waitingJobs -= job
}
}
}
}
def launchExecutor(worker: WorkerInfo, exec: ExecutorInfo) {
logInfo("Launching executor " + exec.fullId + " on worker " + worker.id)
worker.addExecutor(exec)
worker.actor ! LaunchExecutor(exec.job.id, exec.id, exec.job.desc, exec.cores, exec.memory)
exec.job.actor ! ExecutorAdded(exec.id, worker.id, worker.host, exec.cores, exec.memory)
}
def addWorker(id: String, host: String, port: Int, cores: Int, memory: Int): WorkerInfo = {
val worker = new WorkerInfo(id, host, port, cores, memory, sender)
workers += worker
idToWorker(worker.id) = worker
actorToWorker(sender) = worker
addressToWorker(sender.path.address) = worker
return worker
}
def removeWorker(worker: WorkerInfo) {
logInfo("Removing worker " + worker.id + " on " + worker.host + ":" + worker.port)
workers -= worker
idToWorker -= worker.id
actorToWorker -= worker.actor
addressToWorker -= worker.actor.path.address
for (exec <- worker.executors.values) {
exec.job.actor ! ExecutorStateChanged(exec.job.id, exec.id, ExecutorState.LOST, None)
exec.job.executors -= exec.id
}
}
def addJob(desc: JobDescription, actor: ActorRef): JobInfo = {
val date = new Date
val job = new JobInfo(newJobId(date), desc, date, actor)
jobs += job
idToJob(job.id) = job
actorToJob(sender) = job
addressToJob(sender.path.address) = job
return job
}
def removeJob(job: JobInfo) {
logInfo("Removing job " + job.id)
jobs -= job
idToJob -= job.id
actorToJob -= job.actor
addressToWorker -= job.actor.path.address
completedJobs += job // Remember it in our history
waitingJobs -= job
for (exec <- job.executors.values) {
exec.worker.removeExecutor(exec)
exec.worker.actor ! KillExecutor(exec.job.id, exec.id)
}
schedule()
}
/** Generate a new job ID given a job's submission date */
def newJobId(submitDate: Date): String = {
val jobId = "job-%s-%04d".format(DATE_FORMAT.format(submitDate), nextJobNumber)
nextJobNumber += 1
jobId
}
}
object Master {
def main(argStrings: Array[String]) {
val args = new MasterArguments(argStrings)
val (actorSystem, boundPort) = AkkaUtils.createActorSystem("spark", args.ip, args.port)
val actor = actorSystem.actorOf(
Props(new Master(args.ip, boundPort, args.webUiPort)), name = "Master")
actorSystem.awaitTermination()
}
}
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