spark ZooKeeperLeaderElectionAgent 源码
spark ZooKeeperLeaderElectionAgent 代码
文件路径：/core/src/main/scala/org/apache/spark/deploy/master/ZooKeeperLeaderElectionAgent.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.deploy.master
import org.apache.curator.framework.CuratorFramework
import org.apache.curator.framework.recipes.leader.{LeaderLatch, LeaderLatchListener}
import org.apache.spark.SparkConf
import org.apache.spark.deploy.SparkCuratorUtil
import org.apache.spark.internal.Logging
import org.apache.spark.internal.config.Deploy.ZOOKEEPER_DIRECTORY
private[master] class ZooKeeperLeaderElectionAgent(val masterInstance: LeaderElectable,
conf: SparkConf) extends LeaderLatchListener with LeaderElectionAgent with Logging {
val workingDir = conf.get(ZOOKEEPER_DIRECTORY).getOrElse("/spark") + "/leader_election"
private var zk: CuratorFramework = _
private var leaderLatch: LeaderLatch = _
private var status = LeadershipStatus.NOT_LEADER
start()
private def start(): Unit = {
logInfo("Starting ZooKeeper LeaderElection agent")
zk = SparkCuratorUtil.newClient(conf)
leaderLatch = new LeaderLatch(zk, workingDir)
leaderLatch.addListener(this)
leaderLatch.start()
}
override def stop(): Unit = {
leaderLatch.close()
zk.close()
}
override def isLeader(): Unit = {
synchronized {
// could have lost leadership by now.
if (!leaderLatch.hasLeadership) {
return
}
logInfo("We have gained leadership")
updateLeadershipStatus(true)
}
}
override def notLeader(): Unit = {
synchronized {
// could have gained leadership by now.
if (leaderLatch.hasLeadership) {
return
}
logInfo("We have lost leadership")
updateLeadershipStatus(false)
}
}
private def updateLeadershipStatus(isLeader: Boolean): Unit = {
if (isLeader && status == LeadershipStatus.NOT_LEADER) {
status = LeadershipStatus.LEADER
masterInstance.electedLeader()
} else if (!isLeader && status == LeadershipStatus.LEADER) {
status = LeadershipStatus.NOT_LEADER
masterInstance.revokedLeadership()
}
}
private object LeadershipStatus extends Enumeration {
type LeadershipStatus = Value
val LEADER, NOT_LEADER = Value
}
}
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