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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.network.nio
import java.nio.ByteBuffer
import org.apache.spark.network._
import org.apache.spark.network.buffer.{ManagedBuffer, NioManagedBuffer}
import org.apache.spark.network.shuffle.BlockFetchingListener
import org.apache.spark.storage.{BlockId, StorageLevel}
import org.apache.spark.util.Utils
import org.apache.spark.{Logging, SecurityManager, SparkConf, SparkException}
import scala.concurrent.Future
/**
* A [[BlockTransferService]] implementation based on [[ConnectionManager]], a custom
* implementation using Java NIO.
*/
final class NioBlockTransferService(conf: SparkConf, securityManager: SecurityManager)
extends BlockTransferService with Logging {
private var cm: ConnectionManager = _
private var blockDataManager: BlockDataManager = _
/**
* Port number the service is listening on, available only after [[init]] is invoked.
*/
override def port: Int = {
checkInit()
cm.id.port
}
/**
* Host name the service is listening on, available only after [[init]] is invoked.
*/
override def hostName: String = {
checkInit()
cm.id.host
}
/**
* Initialize the transfer service by giving it the BlockDataManager that can be used to fetch
* local blocks or put local blocks.
*/
override def init(blockDataManager: BlockDataManager): Unit = {
this.blockDataManager = blockDataManager
cm = new ConnectionManager(
conf.getInt("spark.blockManager.port", 0),
conf,
securityManager,
"Connection manager for block manager")
cm.onReceiveMessage(onBlockMessageReceive)
}
/**
* Tear down the transfer service.
*/
override def close(): Unit = {
if (cm != null) {
cm.stop()
}
}
override def fetchBlocks(
host: String,
port: Int,
execId: String,
blockIds: Array[String],
listener: BlockFetchingListener): Unit = {
checkInit()
val cmId = new ConnectionManagerId(host, port)
val blockMessageArray = new BlockMessageArray(blockIds.map { blockId =>
BlockMessage.fromGetBlock(GetBlock(BlockId(blockId)))
})
val future = cm.sendMessageReliably(cmId, blockMessageArray.toBufferMessage)
// Register the listener on success/failure future callback.
future.onSuccess { case message =>
val bufferMessage = message.asInstanceOf[BufferMessage]
val blockMessageArray = BlockMessageArray.fromBufferMessage(bufferMessage)
// SPARK-4064: In some cases(eg. Remote block was removed) blockMessageArray may be empty.
if (blockMessageArray.isEmpty) {
blockIds.foreach { id =>
listener.onBlockFetchFailure(id, new SparkException(s"Received empty message from $cmId"))
}
} else {
for (blockMessage: BlockMessage <- blockMessageArray) {
val msgType = blockMessage.getType
if (msgType != BlockMessage.TYPE_GOT_BLOCK) {
if (blockMessage.getId != null) {
listener.onBlockFetchFailure(blockMessage.getId.toString,
new SparkException(s"Unexpected message $msgType received from $cmId"))
}
} else {
val blockId = blockMessage.getId
val networkSize = blockMessage.getData.limit()
listener.onBlockFetchSuccess(
blockId.toString, new NioManagedBuffer(blockMessage.getData))
}
}
}
}(cm.futureExecContext)
future.onFailure { case exception =>
blockIds.foreach { blockId =>
listener.onBlockFetchFailure(blockId, exception)
}
}(cm.futureExecContext)
}
/**
* Upload a single block to a remote node, available only after [[init]] is invoked.
*
* This call blocks until the upload completes, or throws an exception upon failures.
*/
override def uploadBlock(
hostname: String,
port: Int,
blockId: BlockId,
blockData: ManagedBuffer,
level: StorageLevel)
: Future[Unit] = {
checkInit()
val msg = PutBlock(blockId, blockData.nioByteBuffer(), level)
val blockMessageArray = new BlockMessageArray(BlockMessage.fromPutBlock(msg))
val remoteCmId = new ConnectionManagerId(hostName, port)
val reply = cm.sendMessageReliably(remoteCmId, blockMessageArray.toBufferMessage)
reply.map(x => ())(cm.futureExecContext)
}
private def checkInit(): Unit = if (cm == null) {
throw new IllegalStateException(getClass.getName + " has not been initialized")
}
private def onBlockMessageReceive(msg: Message, id: ConnectionManagerId): Option[Message] = {
logDebug("Handling message " + msg)
msg match {
case bufferMessage: BufferMessage =>
try {
logDebug("Handling as a buffer message " + bufferMessage)
val blockMessages = BlockMessageArray.fromBufferMessage(bufferMessage)
logDebug("Parsed as a block message array")
val responseMessages = blockMessages.map(processBlockMessage).filter(_ != None).map(_.get)
Some(new BlockMessageArray(responseMessages).toBufferMessage)
} catch {
case e: Exception =>
logError("Exception handling buffer message", e)
Some(Message.createErrorMessage(e, msg.id))
}
case otherMessage: Any =>
val errorMsg = s"Received unknown message type: ${otherMessage.getClass.getName}"
logError(errorMsg)
Some(Message.createErrorMessage(new UnsupportedOperationException(errorMsg), msg.id))
}
}
private def processBlockMessage(blockMessage: BlockMessage): Option[BlockMessage] = {
blockMessage.getType match {
case BlockMessage.TYPE_PUT_BLOCK =>
val msg = PutBlock(blockMessage.getId, blockMessage.getData, blockMessage.getLevel)
logDebug("Received [" + msg + "]")
putBlock(msg.id, msg.data, msg.level)
None
case BlockMessage.TYPE_GET_BLOCK =>
val msg = new GetBlock(blockMessage.getId)
logDebug("Received [" + msg + "]")
val buffer = getBlock(msg.id)
if (buffer == null) {
return None
}
Some(BlockMessage.fromGotBlock(GotBlock(msg.id, buffer)))
case _ => None
}
}
private def putBlock(blockId: BlockId, bytes: ByteBuffer, level: StorageLevel) {
val startTimeMs = System.currentTimeMillis()
logDebug("PutBlock " + blockId + " started from " + startTimeMs + " with data: " + bytes)
blockDataManager.putBlockData(blockId, new NioManagedBuffer(bytes), level)
logDebug("PutBlock " + blockId + " used " + Utils.getUsedTimeMs(startTimeMs)
+ " with data size: " + bytes.limit)
}
private def getBlock(blockId: BlockId): ByteBuffer = {
val startTimeMs = System.currentTimeMillis()
logDebug("GetBlock " + blockId + " started from " + startTimeMs)
val buffer = blockDataManager.getBlockData(blockId)
logDebug("GetBlock " + blockId + " used " + Utils.getUsedTimeMs(startTimeMs)
+ " and got buffer " + buffer)
buffer.nioByteBuffer()
}
}
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