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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.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.spark.storage
import java.io.{Externalizable, IOException, ObjectInput, ObjectOutput}
import java.util.concurrent.ConcurrentHashMap
import org.apache.spark.SparkContext
import org.apache.spark.annotation.DeveloperApi
import org.apache.spark.util.Utils
/**
* :: DeveloperApi ::
* This class represent an unique identifier for a BlockManager.
*
* The first 2 constructors of this class are made private to ensure that BlockManagerId objects
* can be created only using the apply method in the companion object. This allows de-duplication
* of ID objects. Also, constructor parameters are private to ensure that parameters cannot be
* modified from outside this class.
*/
@DeveloperApi
class BlockManagerId private (
private var executorId_ : String,
private var host_ : String,
private var port_ : Int,
private var topologyInfo_ : Option[String])
extends Externalizable {
private def this() = this(null, null, 0, None) // For deserialization only
def executorId: String = executorId_
if (null != host_) {
Utils.checkHost(host_, "Expected hostname")
assert (port_ > 0)
}
def hostPort: String = {
// DEBUG code
Utils.checkHost(host)
assert (port > 0)
host + ":" + port
}
def host: String = host_
def port: Int = port_
def topologyInfo: Option[String] = topologyInfo_
def isDriver: Boolean = {
executorId == SparkContext.DRIVER_IDENTIFIER ||
executorId == SparkContext.LEGACY_DRIVER_IDENTIFIER
}
override def writeExternal(out: ObjectOutput): Unit = Utils.tryOrIOException {
out.writeUTF(executorId_)
out.writeUTF(host_)
out.writeInt(port_)
out.writeBoolean(topologyInfo_.isDefined)
// we only write topologyInfo if we have it
topologyInfo.foreach(out.writeUTF(_))
}
override def readExternal(in: ObjectInput): Unit = Utils.tryOrIOException {
executorId_ = in.readUTF()
host_ = in.readUTF()
port_ = in.readInt()
val isTopologyInfoAvailable = in.readBoolean()
topologyInfo_ = if (isTopologyInfoAvailable) Option(in.readUTF()) else None
}
@throws(classOf[IOException])
private def readResolve(): Object = BlockManagerId.getCachedBlockManagerId(this)
override def toString: String = s"BlockManagerId($executorId, $host, $port, $topologyInfo)"
override def hashCode: Int =
((executorId.hashCode * 41 + host.hashCode) * 41 + port) * 41 + topologyInfo.hashCode
override def equals(that: Any): Boolean = that match {
case id: BlockManagerId =>
executorId == id.executorId &&
port == id.port &&
host == id.host &&
topologyInfo == id.topologyInfo
case _ =>
false
}
}
private[spark] object BlockManagerId {
/**
* Returns a [[org.apache.spark.storage.BlockManagerId]] for the given configuration.
*
* @param execId ID of the executor.
* @param host Host name of the block manager.
* @param port Port of the block manager.
* @param topologyInfo topology information for the blockmanager, if available
* This can be network topology information for use while choosing peers
* while replicating data blocks. More information available here:
* [[org.apache.spark.storage.TopologyMapper]]
* @return A new [[org.apache.spark.storage.BlockManagerId]].
*/
def apply(
execId: String,
host: String,
port: Int,
topologyInfo: Option[String] = None): BlockManagerId =
getCachedBlockManagerId(new BlockManagerId(execId, host, port, topologyInfo))
def apply(in: ObjectInput): BlockManagerId = {
val obj = new BlockManagerId()
obj.readExternal(in)
getCachedBlockManagerId(obj)
}
val blockManagerIdCache = new ConcurrentHashMap[BlockManagerId, BlockManagerId]()
def getCachedBlockManagerId(id: BlockManagerId): BlockManagerId = {
blockManagerIdCache.putIfAbsent(id, id)
blockManagerIdCache.get(id)
}
}
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