Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/5144#discussion_r28462943
--- Diff:
core/src/main/scala/org/apache/spark/scheduler/cluster/mesos/MesosClusterScheduler.scala
---
@@ -0,0 +1,614 @@
+/*
+ * 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.cluster.mesos
+
+import java.io.File
+import java.util.concurrent.locks.ReentrantLock
+import java.util.{Collections, Date, List => JList}
+
+import org.apache.mesos.Protos.Environment.Variable
+import org.apache.mesos.Protos.TaskStatus.Reason
+import org.apache.mesos.Protos.{TaskState => MesosTaskState, _}
+import org.apache.mesos.{Scheduler, SchedulerDriver}
+import org.apache.spark.deploy.mesos.MesosDriverDescription
+import org.apache.spark.deploy.rest.{CreateSubmissionResponse,
KillSubmissionResponse, SubmissionStatusResponse}
+import org.apache.spark.metrics.MetricsSystem
+import org.apache.spark.util.Utils
+import org.apache.spark.{SecurityManager, SparkConf, SparkException,
TaskState}
+
+import scala.collection.JavaConversions._
+import scala.collection.mutable
+import scala.collection.mutable.ArrayBuffer
+
+
+/**
+ * Tracks the current state of a Mesos Task that runs a Spark driver.
+ * @param submission Submitted driver description from
+ * [[org.apache.spark.deploy.rest.mesos.MesosRestServer]]
+ * @param taskId Mesos TaskID generated for the task
+ * @param slaveId Slave ID that the task is assigned to
+ * @param taskState The last known task status update.
+ * @param startDate The date the task was launched
+ */
+private[spark] class MesosClusterTaskState(
+ val submission: MesosDriverDescription,
+ val taskId: TaskID,
+ val slaveId: SlaveID,
+ var taskState: Option[TaskStatus],
+ var startDate: Date)
+ extends Serializable {
+
+ def copy(): MesosClusterTaskState = {
+ new MesosClusterTaskState(
+ submission, taskId, slaveId, taskState, startDate)
+ }
+}
+
+/**
+ * Tracks the retry state of a driver, which includes the next time it
should be scheduled
+ * and necessary information to do exponential backoff.
+ * This class is not thread-safe, and we expect the caller to handle
synchronizing state.
+ * @param lastFailureStatus Last Task status when it failed.
+ * @param retries Number of times it has retried.
--- End diff --
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