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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._
import akka.actor.ActorRef
import com.google.common.base.Charsets
import com.google.common.io.Files
import org.apache.spark.{SparkConf, Logging}
import org.apache.spark.deploy.{ApplicationDescription, Command, ExecutorState}
import org.apache.spark.deploy.DeployMessages.ExecutorStateChanged
import org.apache.spark.util.logging.FileAppender
/**
* Manages the execution of one executor process.
*/
private[spark] class ExecutorRunner(
val appId: String,
val execId: Int,
val appDesc: ApplicationDescription,
val cores: Int,
val memory: Int,
val worker: ActorRef,
val workerId: String,
val host: String,
val sparkHome: File,
val workDir: File,
val workerUrl: String,
val conf: SparkConf,
var state: ExecutorState.Value)
extends Logging {
val fullId = appId + "/" + execId
var workerThread: Thread = null
var process: Process = null
var stdoutAppender: FileAppender = null
var stderrAppender: FileAppender = null
// NOTE: This is now redundant with the automated shut-down enforced by the Executor. It might
// make sense to remove this in the future.
var shutdownHook: Thread = null
def start() {
workerThread = new Thread("ExecutorRunner for " + fullId) {
override def run() { fetchAndRunExecutor() }
}
workerThread.start()
// Shutdown hook that kills actors on shutdown.
shutdownHook = new Thread() {
override def run() {
killProcess(Some("Worker shutting down"))
}
}
Runtime.getRuntime.addShutdownHook(shutdownHook)
}
/**
* kill executor process, wait for exit and notify worker to update resource status
*
* @param message the exception message which caused the executor's death
*/
private def killProcess(message: Option[String]) {
var exitCode: Option[Int] = None
if (process != null) {
logInfo("Killing process!")
process.destroy()
process.waitFor()
if (stdoutAppender != null) {
stdoutAppender.stop()
}
if (stderrAppender != null) {
stderrAppender.stop()
}
exitCode = Some(process.waitFor())
}
worker ! ExecutorStateChanged(appId, execId, state, message, exitCode)
}
/** Stop this executor runner, including killing the process it launched */
def kill() {
if (workerThread != null) {
// the workerThread will kill the child process when interrupted
workerThread.interrupt()
workerThread = null
state = ExecutorState.KILLED
Runtime.getRuntime.removeShutdownHook(shutdownHook)
}
}
/** Replace variables such as {{EXECUTOR_ID}} and {{CORES}} in a command argument passed to us */
def substituteVariables(argument: String): String = argument match {
case "{{WORKER_URL}}" => workerUrl
case "{{EXECUTOR_ID}}" => execId.toString
case "{{HOSTNAME}}" => host
case "{{CORES}}" => cores.toString
case other => other
}
def getCommandSeq = {
val command = Command(appDesc.command.mainClass,
appDesc.command.arguments.map(substituteVariables) ++ Seq(appId), appDesc.command.environment,
appDesc.command.classPathEntries, appDesc.command.libraryPathEntries,
appDesc.command.extraJavaOptions)
CommandUtils.buildCommandSeq(command, memory, sparkHome.getAbsolutePath)
}
/**
* Download and run the executor described in our ApplicationDescription
*/
def fetchAndRunExecutor() {
try {
// Create the executor's working directory
val executorDir = new File(workDir, appId + "/" + execId)
if (!executorDir.mkdirs()) {
throw new IOException("Failed to create directory " + executorDir)
}
// Launch the process
val command = getCommandSeq
logInfo("Launch command: " + command.mkString("\"", "\" \"", "\""))
val builder = new ProcessBuilder(command: _*).directory(executorDir)
val env = builder.environment()
for ((key, value) <- appDesc.command.environment) {
env.put(key, value)
}
// In case we are running this from within the Spark Shell, avoid creating a "scala"
// parent process for the executor command
env.put("SPARK_LAUNCH_WITH_SCALA", "0")
process = builder.start()
val header = "Spark Executor Command: %s\n%s\n\n".format(
command.mkString("\"", "\" \"", "\""), "=" * 40)
// Redirect its stdout and stderr to files
val stdout = new File(executorDir, "stdout")
stdoutAppender = FileAppender(process.getInputStream, stdout, conf)
val stderr = new File(executorDir, "stderr")
Files.write(header, stderr, Charsets.UTF_8)
stderrAppender = FileAppender(process.getErrorStream, stderr, conf)
// Wait for it to exit; executor may exit with code 0 (when driver instructs it to shutdown)
// or with nonzero exit code
val exitCode = process.waitFor()
state = ExecutorState.EXITED
val message = "Command exited with code " + exitCode
worker ! ExecutorStateChanged(appId, execId, state, Some(message), Some(exitCode))
} catch {
case interrupted: InterruptedException => {
logInfo("Runner thread for executor " + fullId + " interrupted")
state = ExecutorState.KILLED
killProcess(None)
}
case e: Exception => {
logError("Error running executor", e)
state = ExecutorState.FAILED
killProcess(Some(e.toString))
}
}
}
}
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