spark ExternalClusterManager 源码
spark ExternalClusterManager 代码
文件路径：/core/src/main/scala/org/apache/spark/scheduler/ExternalClusterManager.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 org.apache.spark.SparkContext
/**
* A cluster manager interface to plugin external scheduler.
*/
private[spark] trait ExternalClusterManager {
/**
* Check if this cluster manager instance can create scheduler components
* for a certain master URL.
* @param masterURL the master URL
* @return True if the cluster manager can create scheduler backend/
*/
def canCreate(masterURL: String): Boolean
/**
* Create a task scheduler instance for the given SparkContext
* @param sc SparkContext
* @param masterURL the master URL
* @return TaskScheduler that will be responsible for task handling
*/
def createTaskScheduler(sc: SparkContext, masterURL: String): TaskScheduler
/**
* Create a scheduler backend for the given SparkContext and scheduler. This is
* called after task scheduler is created using `ExternalClusterManager.createTaskScheduler()`.
* @param sc SparkContext
* @param masterURL the master URL
* @param scheduler TaskScheduler that will be used with the scheduler backend.
* @return SchedulerBackend that works with a TaskScheduler
*/
def createSchedulerBackend(sc: SparkContext,
masterURL: String,
scheduler: TaskScheduler): SchedulerBackend
/**
* Initialize task scheduler and backend scheduler. This is called after the
* scheduler components are created
* @param scheduler TaskScheduler that will be responsible for task handling
* @param backend SchedulerBackend that works with a TaskScheduler
*/
def initialize(scheduler: TaskScheduler, backend: SchedulerBackend): Unit
}
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