| /* |
| * 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 |
| import org.apache.zookeeper._ |
| |
| import akka.serialization.Serialization |
| |
| class ZooKeeperPersistenceEngine(serialization: Serialization) |
| extends PersistenceEngine |
| with SparkZooKeeperWatcher |
| with Logging |
| { |
| val WORKING_DIR = System.getProperty("spark.deploy.zookeeper.dir", "/spark") + "/master_status" |
| |
| val zk = new SparkZooKeeperSession(this) |
| |
| zk.connect() |
| |
| override def zkSessionCreated() { |
| zk.mkdirRecursive(WORKING_DIR) |
| } |
| |
| override def zkDown() { |
| logError("PersistenceEngine disconnected from ZooKeeper -- ZK looks down.") |
| } |
| |
| override def addApplication(app: ApplicationInfo) { |
| serializeIntoFile(WORKING_DIR + "/app_" + app.id, app) |
| } |
| |
| override def removeApplication(app: ApplicationInfo) { |
| zk.delete(WORKING_DIR + "/app_" + app.id) |
| } |
| |
| override def addWorker(worker: WorkerInfo) { |
| serializeIntoFile(WORKING_DIR + "/worker_" + worker.id, worker) |
| } |
| |
| override def removeWorker(worker: WorkerInfo) { |
| zk.delete(WORKING_DIR + "/worker_" + worker.id) |
| } |
| |
| override def close() { |
| zk.close() |
| } |
| |
| override def readPersistedData(): (Seq[ApplicationInfo], Seq[WorkerInfo]) = { |
| val sortedFiles = zk.getChildren(WORKING_DIR).toList.sorted |
| val appFiles = sortedFiles.filter(_.startsWith("app_")) |
| val apps = appFiles.map(deserializeFromFile[ApplicationInfo]) |
| val workerFiles = sortedFiles.filter(_.startsWith("worker_")) |
| val workers = workerFiles.map(deserializeFromFile[WorkerInfo]) |
| (apps, workers) |
| } |
| |
| private def serializeIntoFile(path: String, value: Serializable) { |
| val serializer = serialization.findSerializerFor(value) |
| val serialized = serializer.toBinary(value) |
| zk.create(path, serialized, CreateMode.PERSISTENT) |
| } |
| |
| def deserializeFromFile[T <: Serializable](filename: String)(implicit m: Manifest[T]): T = { |
| val fileData = zk.getData(WORKING_DIR + "/" + filename) |
| val clazz = m.erasure.asInstanceOf[Class[T]] |
| val serializer = serialization.serializerFor(clazz) |
| serializer.fromBinary(fileData).asInstanceOf[T] |
| } |
| } |