spark ZooKeeperPersistenceEngine 源码

2022-10-20
浏览 (280)

spark ZooKeeperPersistenceEngine 代码

文件路径：/core/src/main/scala/org/apache/spark/deploy/master/ZooKeeperPersistenceEngine.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.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
    }
  }
}

相关信息

spark 源码目录

相关文章

spark ApplicationInfo 源码

spark ApplicationSource 源码

spark ApplicationState 源码

spark DriverInfo 源码

spark DriverState 源码

spark ExecutorDesc 源码

spark ExecutorResourceDescription 源码

spark FileSystemPersistenceEngine 源码

spark LeaderElectionAgent 源码

spark Master 源码

0 赞

所属分类： 前端技术
本文标签：
版权声明： 原创文章如转载，请注明本文链接: https://www.seaxiang.com/blog/a8a8da79ade14022a33ad645dc150297

热门推荐

1、直接访问google.com
2、 - 优质文章
3、 gate.io
4、 harmony 鸿蒙hdc使用指导
5、 harmony 鸿蒙初识ArkTS语言
6、 harmony 鸿蒙ArkUI组件（ArkTS）开发常见问题
7、 flink kafka connector scan.startup.mode 的几个选项
8、 golang
9、 openharmony
10、 Vue中input框自动聚焦

Loading...