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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.scheduler.local
import java.nio.ByteBuffer
import java.util.concurrent.atomic.AtomicInteger
import scala.collection.mutable.{ArrayBuffer, HashMap, HashSet}
import akka.actor._
import org.apache.spark._
import org.apache.spark.TaskState.TaskState
import org.apache.spark.executor.{Executor, ExecutorBackend}
import org.apache.spark.scheduler._
import org.apache.spark.scheduler.SchedulingMode.SchedulingMode
/**
* A FIFO or Fair TaskScheduler implementation that runs tasks locally in a thread pool. Optionally
* the scheduler also allows each task to fail up to maxFailures times, which is useful for
* testing fault recovery.
*/
private[local]
case class LocalReviveOffers()
private[local]
case class LocalStatusUpdate(taskId: Long, state: TaskState, serializedData: ByteBuffer)
private[local]
case class KillTask(taskId: Long)
private[spark]
class LocalActor(localScheduler: LocalScheduler, private var freeCores: Int)
extends Actor with Logging {
val executor = new Executor("localhost", "localhost", Seq.empty, isLocal = true)
def receive = {
case LocalReviveOffers =>
launchTask(localScheduler.resourceOffer(freeCores))
case LocalStatusUpdate(taskId, state, serializeData) =>
if (TaskState.isFinished(state)) {
freeCores += 1
launchTask(localScheduler.resourceOffer(freeCores))
}
case KillTask(taskId) =>
executor.killTask(taskId)
}
private def launchTask(tasks: Seq[TaskDescription]) {
for (task <- tasks) {
freeCores -= 1
executor.launchTask(localScheduler, task.taskId, task.serializedTask)
}
}
}
private[spark] class LocalScheduler(val threads: Int, val maxFailures: Int, val sc: SparkContext)
extends TaskScheduler
with ExecutorBackend
with Logging {
val env = SparkEnv.get
val attemptId = new AtomicInteger
var dagScheduler: DAGScheduler = null
// Application dependencies (added through SparkContext) that we've fetched so far on this node.
// Each map holds the master's timestamp for the version of that file or JAR we got.
val currentFiles: HashMap[String, Long] = new HashMap[String, Long]()
val currentJars: HashMap[String, Long] = new HashMap[String, Long]()
var schedulableBuilder: SchedulableBuilder = null
var rootPool: Pool = null
val schedulingMode: SchedulingMode = SchedulingMode.withName(
System.getProperty("spark.scheduler.mode", "FIFO"))
val activeTaskSets = new HashMap[String, LocalTaskSetManager]
val taskIdToTaskSetId = new HashMap[Long, String]
val taskSetTaskIds = new HashMap[String, HashSet[Long]]
var localActor: ActorRef = null
override def start() {
// temporarily set rootPool name to empty
rootPool = new Pool("", schedulingMode, 0, 0)
schedulableBuilder = {
schedulingMode match {
case SchedulingMode.FIFO =>
new FIFOSchedulableBuilder(rootPool)
case SchedulingMode.FAIR =>
new FairSchedulableBuilder(rootPool)
}
}
schedulableBuilder.buildPools()
localActor = env.actorSystem.actorOf(Props(new LocalActor(this, threads)), "Test")
}
override def setDAGScheduler(dagScheduler: DAGScheduler) {
this.dagScheduler = dagScheduler
}
override def submitTasks(taskSet: TaskSet) {
synchronized {
val manager = new LocalTaskSetManager(this, taskSet)
schedulableBuilder.addTaskSetManager(manager, manager.taskSet.properties)
activeTaskSets(taskSet.id) = manager
taskSetTaskIds(taskSet.id) = new HashSet[Long]()
localActor ! LocalReviveOffers
}
}
override def cancelTasks(stageId: Int): Unit = synchronized {
logInfo("Cancelling stage " + stageId)
logInfo("Cancelling stage " + activeTaskSets.map(_._2.stageId))
activeTaskSets.find(_._2.stageId == stageId).foreach { case (_, tsm) =>
// There are two possible cases here:
// 1. The task set manager has been created and some tasks have been scheduled.
// In this case, send a kill signal to the executors to kill the task and then abort
// the stage.
// 2. The task set manager has been created but no tasks has been scheduled. In this case,
// simply abort the stage.
val taskIds = taskSetTaskIds(tsm.taskSet.id)
if (taskIds.size > 0) {
taskIds.foreach { tid =>
localActor ! KillTask(tid)
}
}
tsm.error("Stage %d was cancelled".format(stageId))
}
}
def resourceOffer(freeCores: Int): Seq[TaskDescription] = {
synchronized {
var freeCpuCores = freeCores
val tasks = new ArrayBuffer[TaskDescription](freeCores)
val sortedTaskSetQueue = rootPool.getSortedTaskSetQueue()
for (manager <- sortedTaskSetQueue) {
logDebug("parentName:%s,name:%s,runningTasks:%s".format(
manager.parent.name, manager.name, manager.runningTasks))
}
var launchTask = false
for (manager <- sortedTaskSetQueue) {
do {
launchTask = false
manager.resourceOffer(null, null, freeCpuCores, null) match {
case Some(task) =>
tasks += task
taskIdToTaskSetId(task.taskId) = manager.taskSet.id
taskSetTaskIds(manager.taskSet.id) += task.taskId
freeCpuCores -= 1
launchTask = true
case None => {}
}
} while(launchTask)
}
return tasks
}
}
def taskSetFinished(manager: TaskSetManager) {
synchronized {
activeTaskSets -= manager.taskSet.id
manager.parent.removeSchedulable(manager)
logInfo("Remove TaskSet %s from pool %s".format(manager.taskSet.id, manager.parent.name))
taskIdToTaskSetId --= taskSetTaskIds(manager.taskSet.id)
taskSetTaskIds -= manager.taskSet.id
}
}
override def statusUpdate(taskId: Long, state: TaskState, serializedData: ByteBuffer) {
if (TaskState.isFinished(state)) {
synchronized {
taskIdToTaskSetId.get(taskId) match {
case Some(taskSetId) =>
val taskSetManager = activeTaskSets(taskSetId)
taskSetTaskIds(taskSetId) -= taskId
state match {
case TaskState.FINISHED =>
taskSetManager.taskEnded(taskId, state, serializedData)
case TaskState.FAILED =>
taskSetManager.taskFailed(taskId, state, serializedData)
case TaskState.KILLED =>
taskSetManager.error("Task %d was killed".format(taskId))
case _ => {}
}
case None =>
logInfo("Ignoring update from TID " + taskId + " because its task set is gone")
}
}
localActor ! LocalStatusUpdate(taskId, state, serializedData)
}
}
override def stop() {
}
override def defaultParallelism() = threads
}
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