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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 akka.actor.{Actor, ActorRef}
import org.apache.spark.deploy.master.MasterMessages.ElectedLeader
/**
* A LeaderElectionAgent keeps track of whether the current Master is the leader, meaning it
* is the only Master serving requests.
* In addition to the API provided, the LeaderElectionAgent will use of the following messages
* to inform the Master of leader changes:
* [[org.apache.spark.deploy.master.MasterMessages.ElectedLeader ElectedLeader]]
* [[org.apache.spark.deploy.master.MasterMessages.RevokedLeadership RevokedLeadership]]
*/
private[spark] trait LeaderElectionAgent extends Actor {
// TODO: LeaderElectionAgent does not necessary to be an Actor anymore, need refactoring.
val masterActor: ActorRef
}
/** Single-node implementation of LeaderElectionAgent -- we're initially and always the leader. */
private[spark] class MonarchyLeaderAgent(val masterActor: ActorRef) extends LeaderElectionAgent {
override def preStart() {
masterActor ! ElectedLeader
}
override def receive = {
case _ =>
}
}
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