spark SchedulingAlgorithm 源码
spark SchedulingAlgorithm 代码
文件路径：/core/src/main/scala/org/apache/spark/scheduler/SchedulingAlgorithm.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
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package org.apache.spark.scheduler
/**
* An interface for sort algorithm
* FIFO: FIFO algorithm between TaskSetManagers
* FS: FS algorithm between Pools, and FIFO or FS within Pools
*/
private[spark] trait SchedulingAlgorithm {
def comparator(s1: Schedulable, s2: Schedulable): Boolean
}
private[spark] class FIFOSchedulingAlgorithm extends SchedulingAlgorithm {
override def comparator(s1: Schedulable, s2: Schedulable): Boolean = {
val priority1 = s1.priority
val priority2 = s2.priority
var res = math.signum(priority1 - priority2)
if (res == 0) {
val stageId1 = s1.stageId
val stageId2 = s2.stageId
res = math.signum(stageId1 - stageId2)
}
res < 0
}
}
private[spark] class FairSchedulingAlgorithm extends SchedulingAlgorithm {
override def comparator(s1: Schedulable, s2: Schedulable): Boolean = {
val minShare1 = s1.minShare
val minShare2 = s2.minShare
val runningTasks1 = s1.runningTasks
val runningTasks2 = s2.runningTasks
val s1Needy = runningTasks1 < minShare1
val s2Needy = runningTasks2 < minShare2
val minShareRatio1 = runningTasks1.toDouble / math.max(minShare1, 1.0)
val minShareRatio2 = runningTasks2.toDouble / math.max(minShare2, 1.0)
val taskToWeightRatio1 = runningTasks1.toDouble / s1.weight.toDouble
val taskToWeightRatio2 = runningTasks2.toDouble / s2.weight.toDouble
var compare = 0
if (s1Needy && !s2Needy) {
return true
} else if (!s1Needy && s2Needy) {
return false
} else if (s1Needy && s2Needy) {
compare = minShareRatio1.compareTo(minShareRatio2)
} else {
compare = taskToWeightRatio1.compareTo(taskToWeightRatio2)
}
if (compare < 0) {
true
} else if (compare > 0) {
false
} else {
s1.name < s2.name
}
}
}
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