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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.scheduler
import java.io.{FileInputStream, InputStream}
import java.util.{NoSuchElementException, Properties}
import scala.xml.XML
import org.apache.spark.SparkConf
import org.apache.spark.internal.Logging
import org.apache.spark.util.Utils
/**
* An interface to build Schedulable tree
* buildPools: build the tree nodes(pools)
* addTaskSetManager: build the leaf nodes(TaskSetManagers)
*/
private[spark] trait SchedulableBuilder {
def rootPool: Pool
def buildPools(): Unit
def addTaskSetManager(manager: Schedulable, properties: Properties): Unit
}
private[spark] class FIFOSchedulableBuilder(val rootPool: Pool)
extends SchedulableBuilder with Logging {
override def buildPools() {
// nothing
}
override def addTaskSetManager(manager: Schedulable, properties: Properties) {
rootPool.addSchedulable(manager)
}
}
private[spark] class FairSchedulableBuilder(val rootPool: Pool, conf: SparkConf)
extends SchedulableBuilder with Logging {
val schedulerAllocFile = conf.getOption("spark.scheduler.allocation.file")
val DEFAULT_SCHEDULER_FILE = "fairscheduler.xml"
val FAIR_SCHEDULER_PROPERTIES = "spark.scheduler.pool"
val DEFAULT_POOL_NAME = "default"
val MINIMUM_SHARES_PROPERTY = "minShare"
val SCHEDULING_MODE_PROPERTY = "schedulingMode"
val WEIGHT_PROPERTY = "weight"
val POOL_NAME_PROPERTY = "@name"
val POOLS_PROPERTY = "pool"
val DEFAULT_SCHEDULING_MODE = SchedulingMode.FIFO
val DEFAULT_MINIMUM_SHARE = 0
val DEFAULT_WEIGHT = 1
override def buildPools() {
var is: Option[InputStream] = None
try {
is = Option {
schedulerAllocFile.map { f =>
new FileInputStream(f)
}.getOrElse {
Utils.getSparkClassLoader.getResourceAsStream(DEFAULT_SCHEDULER_FILE)
}
}
is.foreach { i => buildFairSchedulerPool(i) }
} finally {
is.foreach(_.close())
}
// finally create "default" pool
buildDefaultPool()
}
private def buildDefaultPool() {
if (rootPool.getSchedulableByName(DEFAULT_POOL_NAME) == null) {
val pool = new Pool(DEFAULT_POOL_NAME, DEFAULT_SCHEDULING_MODE,
DEFAULT_MINIMUM_SHARE, DEFAULT_WEIGHT)
rootPool.addSchedulable(pool)
logInfo("Created default pool %s, schedulingMode: %s, minShare: %d, weight: %d".format(
DEFAULT_POOL_NAME, DEFAULT_SCHEDULING_MODE, DEFAULT_MINIMUM_SHARE, DEFAULT_WEIGHT))
}
}
private def buildFairSchedulerPool(is: InputStream) {
val xml = XML.load(is)
for (poolNode <- (xml \\ POOLS_PROPERTY)) {
val poolName = (poolNode \ POOL_NAME_PROPERTY).text
var schedulingMode = DEFAULT_SCHEDULING_MODE
var minShare = DEFAULT_MINIMUM_SHARE
var weight = DEFAULT_WEIGHT
val xmlSchedulingMode = (poolNode \ SCHEDULING_MODE_PROPERTY).text
if (xmlSchedulingMode != "") {
try {
schedulingMode = SchedulingMode.withName(xmlSchedulingMode)
} catch {
case e: NoSuchElementException =>
logWarning("Error xml schedulingMode, using default schedulingMode")
}
}
val xmlMinShare = (poolNode \ MINIMUM_SHARES_PROPERTY).text
if (xmlMinShare != "") {
minShare = xmlMinShare.toInt
}
val xmlWeight = (poolNode \ WEIGHT_PROPERTY).text
if (xmlWeight != "") {
weight = xmlWeight.toInt
}
val pool = new Pool(poolName, schedulingMode, minShare, weight)
rootPool.addSchedulable(pool)
logInfo("Created pool %s, schedulingMode: %s, minShare: %d, weight: %d".format(
poolName, schedulingMode, minShare, weight))
}
}
override def addTaskSetManager(manager: Schedulable, properties: Properties) {
var poolName = DEFAULT_POOL_NAME
var parentPool = rootPool.getSchedulableByName(poolName)
if (properties != null) {
poolName = properties.getProperty(FAIR_SCHEDULER_PROPERTIES, DEFAULT_POOL_NAME)
parentPool = rootPool.getSchedulableByName(poolName)
if (parentPool == null) {
// we will create a new pool that user has configured in app
// instead of being defined in xml file
parentPool = new Pool(poolName, DEFAULT_SCHEDULING_MODE,
DEFAULT_MINIMUM_SHARE, DEFAULT_WEIGHT)
rootPool.addSchedulable(parentPool)
logInfo("Created pool %s, schedulingMode: %s, minShare: %d, weight: %d".format(
poolName, DEFAULT_SCHEDULING_MODE, DEFAULT_MINIMUM_SHARE, DEFAULT_WEIGHT))
}
}
parentPool.addSchedulable(manager)
logInfo("Added task set " + manager.name + " tasks to pool " + poolName)
}
}
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