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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.worker
import java.io.File
import org.apache.spark.{SecurityManager, SparkConf}
import org.apache.spark.rpc.RpcEnv
import org.apache.spark.util.{ChildFirstURLClassLoader, MutableURLClassLoader, Utils}
/**
* Utility object for launching driver programs such that they share fate with the Worker process.
* This is used in standalone cluster mode only.
*/
object DriverWrapper {
def main(args: Array[String]) {
args.toList match {
/*
* IMPORTANT: Spark 1.3 provides a stable application submission gateway that is both
* backward and forward compatible across future Spark versions. Because this gateway
* uses this class to launch the driver, the ordering and semantics of the arguments
* here must also remain consistent across versions.
*/
case workerUrl :: userJar :: mainClass :: extraArgs =>
val conf = new SparkConf()
val rpcEnv = RpcEnv.create("Driver",
Utils.localHostName(), 0, conf, new SecurityManager(conf))
rpcEnv.setupEndpoint("workerWatcher", new WorkerWatcher(rpcEnv, workerUrl))
val currentLoader = Thread.currentThread.getContextClassLoader
val userJarUrl = new File(userJar).toURI().toURL()
val loader =
if (sys.props.getOrElse("spark.driver.userClassPathFirst", "false").toBoolean) {
new ChildFirstURLClassLoader(Array(userJarUrl), currentLoader)
} else {
new MutableURLClassLoader(Array(userJarUrl), currentLoader)
}
Thread.currentThread.setContextClassLoader(loader)
// Delegate to supplied main class
val clazz = Class.forName(mainClass, true, loader)
val mainMethod = clazz.getMethod("main", classOf[Array[String]])
mainMethod.invoke(null, extraArgs.toArray[String])
rpcEnv.shutdown()
case _ =>
// scalastyle:off println
System.err.println("Usage: DriverWrapper <workerUrl> <userJar> <driverMainClass> [options]")
// scalastyle:on println
System.exit(-1)
}
}
}
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