1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
|
/*
* 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.serialization.Serialization
import scala.collection.JavaConversions._
import scala.reflect.ClassTag
import org.apache.curator.framework.CuratorFramework
import org.apache.zookeeper.CreateMode
import org.apache.spark.{Logging, SparkConf}
private[master] class ZooKeeperPersistenceEngine(conf: SparkConf, val serialization: Serialization)
extends PersistenceEngine
with Logging {
private val WORKING_DIR = conf.get("spark.deploy.zookeeper.dir", "/spark") + "/master_status"
private val zk: CuratorFramework = SparkCuratorUtil.newClient(conf)
SparkCuratorUtil.mkdir(zk, WORKING_DIR)
override def persist(name: String, obj: Object): Unit = {
serializeIntoFile(WORKING_DIR + "/" + name, obj)
}
override def unpersist(name: String): Unit = {
zk.delete().forPath(WORKING_DIR + "/" + name)
}
override def read[T: ClassTag](prefix: String): Seq[T] = {
val file = zk.getChildren.forPath(WORKING_DIR).filter(_.startsWith(prefix))
file.map(deserializeFromFile[T]).flatten
}
override def close() {
zk.close()
}
private def serializeIntoFile(path: String, value: AnyRef) {
val serializer = serialization.findSerializerFor(value)
val serialized = serializer.toBinary(value)
zk.create().withMode(CreateMode.PERSISTENT).forPath(path, serialized)
}
private def deserializeFromFile[T](filename: String)(implicit m: ClassTag[T]): Option[T] = {
val fileData = zk.getData().forPath(WORKING_DIR + "/" + filename)
val clazz = m.runtimeClass.asInstanceOf[Class[T]]
val serializer = serialization.serializerFor(clazz)
try {
Some(serializer.fromBinary(fileData).asInstanceOf[T])
} catch {
case e: Exception => {
logWarning("Exception while reading persisted file, deleting", e)
zk.delete().forPath(WORKING_DIR + "/" + filename)
None
}
}
}
}
|
