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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
import org.apache.spark.executor.TaskMetrics
import org.apache.spark.storage.BlockManagerId
/**
* Various possible reasons why a task ended. The low-level TaskScheduler is supposed to retry
* tasks several times for "ephemeral" failures, and only report back failures that require some
* old stages to be resubmitted, such as shuffle map fetch failures.
*/
private[spark] sealed trait TaskEndReason
private[spark] case object Success extends TaskEndReason
private[spark]
case object Resubmitted extends TaskEndReason // Task was finished earlier but we've now lost it
private[spark] case class FetchFailed(
bmAddress: BlockManagerId,
shuffleId: Int,
mapId: Int,
reduceId: Int)
extends TaskEndReason
private[spark] case class ExceptionFailure(
className: String,
description: String,
stackTrace: Array[StackTraceElement],
metrics: Option[TaskMetrics])
extends TaskEndReason
/**
* The task finished successfully, but the result was lost from the executor's block manager before
* it was fetched.
*/
private[spark] case object TaskResultLost extends TaskEndReason
private[spark] case object TaskKilled extends TaskEndReason
/**
* The task failed because the executor that it was running on was lost. This may happen because
* the task crashed the JVM.
*/
private[spark] case object ExecutorLostFailure extends TaskEndReason
/**
* We don't know why the task ended -- for example, because of a ClassNotFound exception when
* deserializing the task result.
*/
private[spark] case object UnknownReason extends TaskEndReason
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