spark ExecutorFailuresInTaskSet 源码
spark ExecutorFailuresInTaskSet 代码
文件路径：/core/src/main/scala/org/apache/spark/scheduler/ExecutorFailuresInTaskSet.scala
/*
* 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
import scala.collection.mutable.HashMap
/**
* Small helper for tracking failed tasks for exclusion purposes. Info on all failures on one
* executor, within one task set.
*/
private[scheduler] class ExecutorFailuresInTaskSet(val node: String) {
/**
* Mapping from index of the tasks in the taskset, to the number of times it has failed on this
* executor and the most recent failure time.
*/
val taskToFailureCountAndFailureTime = HashMap[Int, (Int, Long)]()
def updateWithFailure(taskIndex: Int, failureTime: Long): Unit = {
val (prevFailureCount, prevFailureTime) =
taskToFailureCountAndFailureTime.getOrElse(taskIndex, (0, -1L))
// these times always come from the driver, so we don't need to worry about skew, but might
// as well still be defensive in case there is non-monotonicity in the clock
val newFailureTime = math.max(prevFailureTime, failureTime)
taskToFailureCountAndFailureTime(taskIndex) = (prevFailureCount + 1, newFailureTime)
}
def numUniqueTasksWithFailures: Int = taskToFailureCountAndFailureTime.size
/**
* Return the number of times this executor has failed on the given task index.
*/
def getNumTaskFailures(index: Int): Int = {
taskToFailureCountAndFailureTime.getOrElse(index, (0, 0))._1
}
override def toString(): String = {
s"numUniqueTasksWithFailures = $numUniqueTasksWithFailures; " +
s"tasksToFailureCount = $taskToFailureCountAndFailureTime"
}
}
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