spark ZooKeeperPersistenceEngine 源码
spark ZooKeeperPersistenceEngine 代码
文件路径：/core/src/main/scala/org/apache/spark/deploy/master/ZooKeeperPersistenceEngine.scala
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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.
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package org.apache.spark.deploy.master
import java.nio.ByteBuffer
import scala.collection.JavaConverters._
import scala.reflect.ClassTag
import org.apache.curator.framework.CuratorFramework
import org.apache.zookeeper.CreateMode
import org.apache.spark.SparkConf
import org.apache.spark.deploy.SparkCuratorUtil
import org.apache.spark.internal.Logging
import org.apache.spark.internal.config.Deploy._
import org.apache.spark.serializer.Serializer
private[master] class ZooKeeperPersistenceEngine(conf: SparkConf, val serializer: Serializer)
extends PersistenceEngine
with Logging {
private val workingDir = conf.get(ZOOKEEPER_DIRECTORY).getOrElse("/spark") + "/master_status"
private val zk: CuratorFramework = SparkCuratorUtil.newClient(conf)
SparkCuratorUtil.mkdir(zk, workingDir)
override def persist(name: String, obj: Object): Unit = {
serializeIntoFile(workingDir + "/" + name, obj)
}
override def unpersist(name: String): Unit = {
zk.delete().forPath(workingDir + "/" + name)
}
override def read[T: ClassTag](prefix: String): Seq[T] = {
zk.getChildren.forPath(workingDir).asScala
.filter(_.startsWith(prefix)).flatMap(deserializeFromFile[T]).toSeq
}
override def close(): Unit = {
zk.close()
}
private def serializeIntoFile(path: String, value: AnyRef): Unit = {
val serialized = serializer.newInstance().serialize(value)
val bytes = new Array[Byte](serialized.remaining())
serialized.get(bytes)
zk.create().withMode(CreateMode.PERSISTENT).forPath(path, bytes)
}
private def deserializeFromFile[T](filename: String)(implicit m: ClassTag[T]): Option[T] = {
val fileData = zk.getData().forPath(workingDir + "/" + filename)
try {
Some(serializer.newInstance().deserialize[T](ByteBuffer.wrap(fileData)))
} catch {
case e: Exception =>
logWarning("Exception while reading persisted file, deleting", e)
zk.delete().forPath(workingDir + "/" + filename)
None
}
}
}
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