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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.deploy.master
import org.apache.spark.{Logging, SparkConf}
import org.apache.spark.annotation.DeveloperApi
import org.apache.spark.serializer.Serializer
/**
* ::DeveloperApi::
*
* Implementation of this class can be plugged in as recovery mode alternative for Spark's
* Standalone mode.
*
*/
@DeveloperApi
abstract class StandaloneRecoveryModeFactory(conf: SparkConf, serializer: Serializer) {
/**
* PersistenceEngine defines how the persistent data(Information about worker, driver etc..)
* is handled for recovery.
*
*/
def createPersistenceEngine(): PersistenceEngine
/**
* Create an instance of LeaderAgent that decides who gets elected as master.
*/
def createLeaderElectionAgent(master: LeaderElectable): LeaderElectionAgent
}
/**
* LeaderAgent in this case is a no-op. Since leader is forever leader as the actual
* recovery is made by restoring from filesystem.
*/
private[master] class FileSystemRecoveryModeFactory(conf: SparkConf, serializer: Serializer)
extends StandaloneRecoveryModeFactory(conf, serializer) with Logging {
val RECOVERY_DIR = conf.get("spark.deploy.recoveryDirectory", "")
def createPersistenceEngine(): PersistenceEngine = {
logInfo("Persisting recovery state to directory: " + RECOVERY_DIR)
new FileSystemPersistenceEngine(RECOVERY_DIR, serializer)
}
def createLeaderElectionAgent(master: LeaderElectable): LeaderElectionAgent = {
new MonarchyLeaderAgent(master)
}
}
private[master] class ZooKeeperRecoveryModeFactory(conf: SparkConf, serializer: Serializer)
extends StandaloneRecoveryModeFactory(conf, serializer) {
def createPersistenceEngine(): PersistenceEngine = {
new ZooKeeperPersistenceEngine(conf, serializer)
}
def createLeaderElectionAgent(master: LeaderElectable): LeaderElectionAgent = {
new ZooKeeperLeaderElectionAgent(master, conf)
}
}
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