Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/2020#discussion_r16730231
--- Diff:
yarn/common/src/main/scala/org/apache/spark/deploy/yarn/ApplicationMaster.scala
---
@@ -0,0 +1,425 @@
+/*
+ * 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.yarn
+
+import java.io.IOException
+import java.net.Socket
+import java.util.concurrent.atomic.AtomicReference
+
+import scala.collection.JavaConversions._
+import scala.util.Try
+
+import akka.actor._
+import akka.remote._
+import org.apache.hadoop.conf.Configuration
+import org.apache.hadoop.fs.{FileSystem, Path}
+import org.apache.hadoop.util.ShutdownHookManager
+import org.apache.hadoop.yarn.api._
+import org.apache.hadoop.yarn.api.records._
+import org.apache.hadoop.yarn.conf.YarnConfiguration
+
+import org.apache.spark.{Logging, SecurityManager, SparkConf, SparkContext}
+import org.apache.spark.deploy.SparkHadoopUtil
+import org.apache.spark.scheduler.cluster.CoarseGrainedSchedulerBackend
+import
org.apache.spark.scheduler.cluster.CoarseGrainedClusterMessages.AddWebUIFilter
+import org.apache.spark.util.{AkkaUtils, SignalLogger, Utils}
+
+/**
+ * Common application master functionality for Spark on Yarn.
+ */
+private[spark] class ApplicationMaster(args: ApplicationMasterArguments,
+ client: YarnRMClient) extends Logging {
+ // TODO: Currently, task to container is computed once (TaskSetManager)
- which need not be
+ // optimal as more containers are available. Might need to handle this
better.
+ private val ALLOCATE_HEARTBEAT_INTERVAL = 100
+
+ private val sparkConf = new SparkConf()
+ private val yarnConf: YarnConfiguration = new YarnConfiguration(new
Configuration())
+ private val isDriver = args.userClass != null
+
+ // Default to numExecutors * 2, with minimum of 3
+ private val maxNumExecutorFailures =
sparkConf.getInt("spark.yarn.max.executor.failures",
+ sparkConf.getInt("spark.yarn.max.worker.failures",
math.max(args.numExecutors * 2, 3)))
+
+ @volatile private var finished = false
+ @volatile private var finalStatus = FinalApplicationStatus.UNDEFINED
+
+ private var reporterThread: Thread = _
+ private var allocator: YarnAllocator = _
+
+ // Fields used in client mode.
+ private var actorSystem: ActorSystem = null
+ private var actor: ActorRef = _
+
+ // Fields used in cluster mode.
+ private val sparkContextRef = new AtomicReference[SparkContext](null)
+
+ final def run(): Int = {
+ if (isDriver) {
+ // Set the web ui port to be ephemeral for yarn so we don't conflict
with
+ // other spark processes running on the same box
+ System.setProperty("spark.ui.port", "0")
+
+ // Set the master property to match the requested mode.
+ System.setProperty("spark.master", "yarn-cluster")
+ }
+
+ logInfo("ApplicationAttemptId: " + client.getAttemptId())
+
+ val cleanupHook = new Runnable {
+ override def run() {
+ // If the SparkContext is still registered, shut it down as a best
case effort in case
+ // users do not call sc.stop or do System.exit().
+ val sc = sparkContextRef.get()
+ if (sc != null) {
+ logInfo("Invoking sc stop from shutdown hook")
+ sc.stop()
+ finish(FinalApplicationStatus.SUCCEEDED)
+ }
+
+ // Cleanup the staging dir after the app is finished, or if it's
the last attempt at
+ // running the AM.
+ val maxAppAttempts = client.getMaxRegAttempts(yarnConf)
+ val isLastAttempt = client.getAttemptId().getAttemptId() >=
maxAppAttempts
+ if (finished || isLastAttempt) {
+ cleanupStagingDir()
+ }
+ }
+ }
+ // Use priority 30 as it's higher than HDFS. It's the same priority
MapReduce is using.
+ ShutdownHookManager.get().addShutdownHook(cleanupHook, 30)
+
+ // Call this to force generation of secret so it gets populated into
the
+ // Hadoop UGI. This has to happen before the startUserClass which does
a
+ // doAs in order for the credentials to be passed on to the executor
containers.
+ val securityMgr = new SecurityManager(sparkConf)
+
+ if (isDriver) {
+ runDriver()
+ } else {
+ runExecutorLauncher(securityMgr)
+ }
+
+ if (finalStatus != FinalApplicationStatus.UNDEFINED) {
+ finish(finalStatus)
+ 0
+ } else {
+ 1
+ }
+ }
+
+ final def finish(status: FinalApplicationStatus, diagnostics: String =
null) = synchronized {
+ if (!finished) {
+ logInfo(s"Finishing ApplicationMaster with $status" +
+ Option(diagnostics).map(msg => s" (diag message:
$msg)").getOrElse(""))
+ finished = true
+ finalStatus = status
+ reporterThread.interrupt()
--- End diff --
Hmmm. Works fine in stable, and interrupting "self" should be ok in
general. But I guess it's safer to not do it (and avoid the sleep in the
reporter thread when the AM is finished).
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