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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
import java.util.concurrent.CountDownLatch
import scala.collection.JavaConverters._
import org.apache.spark.{Logging, SparkConf, SecurityManager}
import org.apache.spark.network.TransportContext
import org.apache.spark.network.netty.SparkTransportConf
import org.apache.spark.network.sasl.SaslServerBootstrap
import org.apache.spark.network.server.{TransportServerBootstrap, TransportServer}
import org.apache.spark.network.shuffle.ExternalShuffleBlockHandler
import org.apache.spark.network.util.TransportConf
import org.apache.spark.util.Utils
/**
* Provides a server from which Executors can read shuffle files (rather than reading directly from
* each other), to provide uninterrupted access to the files in the face of executors being turned
* off or killed.
*
* Optionally requires SASL authentication in order to read. See [[SecurityManager]].
*/
private[deploy]
class ExternalShuffleService(sparkConf: SparkConf, securityManager: SecurityManager)
extends Logging {
private val enabled = sparkConf.getBoolean("spark.shuffle.service.enabled", false)
private val port = sparkConf.getInt("spark.shuffle.service.port", 7337)
private val useSasl: Boolean = securityManager.isAuthenticationEnabled()
private val transportConf =
SparkTransportConf.fromSparkConf(sparkConf, "shuffle", numUsableCores = 0)
private val blockHandler = newShuffleBlockHandler(transportConf)
private val transportContext: TransportContext =
new TransportContext(transportConf, blockHandler, true)
private var server: TransportServer = _
/** Create a new shuffle block handler. Factored out for subclasses to override. */
protected def newShuffleBlockHandler(conf: TransportConf): ExternalShuffleBlockHandler = {
new ExternalShuffleBlockHandler(conf, null)
}
/** Starts the external shuffle service if the user has configured us to. */
def startIfEnabled() {
if (enabled) {
start()
}
}
/** Start the external shuffle service */
def start() {
require(server == null, "Shuffle server already started")
logInfo(s"Starting shuffle service on port $port with useSasl = $useSasl")
val bootstraps: Seq[TransportServerBootstrap] =
if (useSasl) {
Seq(new SaslServerBootstrap(transportConf, securityManager))
} else {
Nil
}
server = transportContext.createServer(port, bootstraps.asJava)
}
/** Clean up all shuffle files associated with an application that has exited. */
def applicationRemoved(appId: String): Unit = {
blockHandler.applicationRemoved(appId, true /* cleanupLocalDirs */)
}
def stop() {
if (server != null) {
server.close()
server = null
}
}
}
/**
* A main class for running the external shuffle service.
*/
object ExternalShuffleService extends Logging {
@volatile
private var server: ExternalShuffleService = _
private val barrier = new CountDownLatch(1)
def main(args: Array[String]): Unit = {
main(args, (conf: SparkConf, sm: SecurityManager) => new ExternalShuffleService(conf, sm))
}
/** A helper main method that allows the caller to call this with a custom shuffle service. */
private[spark] def main(
args: Array[String],
newShuffleService: (SparkConf, SecurityManager) => ExternalShuffleService): Unit = {
val sparkConf = new SparkConf
Utils.loadDefaultSparkProperties(sparkConf)
val securityManager = new SecurityManager(sparkConf)
// we override this value since this service is started from the command line
// and we assume the user really wants it to be running
sparkConf.set("spark.shuffle.service.enabled", "true")
server = newShuffleService(sparkConf, securityManager)
server.start()
installShutdownHook()
// keep running until the process is terminated
barrier.await()
}
private def installShutdownHook(): Unit = {
Runtime.getRuntime.addShutdownHook(new Thread("External Shuffle Service shutdown thread") {
override def run() {
logInfo("Shutting down shuffle service.")
server.stop()
barrier.countDown()
}
})
}
}
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