Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/2240#discussion_r17032690
--- Diff:
core/src/main/scala/org/apache/spark/network/nio/NioBlockTransferService.scala
---
@@ -0,0 +1,205 @@
+/*
+ * 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 scala.concurrent.Future
+
+import org.apache.spark.{SparkException, Logging, SecurityManager,
SparkConf}
+import org.apache.spark.network._
+import org.apache.spark.storage.{BlockId, StorageLevel}
+import org.apache.spark.util.Utils
+
+
+/**
+ * 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 stop(): Unit = {
+ if (cm != null) {
+ cm.stop()
+ }
+ }
+
+ override def fetchBlocks(
+ hostName: String,
+ port: Int,
+ blockIds: Seq[String],
+ listener: BlockFetchingListener): Unit = {
+ checkInit()
+
+ val cmId = new ConnectionManagerId(hostName, 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)
+
+ for (blockMessage <- blockMessageArray) {
+ if (blockMessage.getType != BlockMessage.TYPE_GOT_BLOCK) {
+ listener.onBlockFetchFailure(
+ new SparkException(s"Unexpected message
${blockMessage.getType} received from $cmId"))
+ } else {
+ val blockId = blockMessage.getId
+ val networkSize = blockMessage.getData.limit()
+ listener.onBlockFetchSuccess(
+ blockId.toString, new
NioByteBufferManagedBuffer(blockMessage.getData))
+ }
+ }
+ }(cm.futureExecContext)
+
+ future.onFailure { case exception =>
+ listener.onBlockFetchFailure(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: String,
+ blockData: ManagedBuffer,
+ level: StorageLevel)
+ : Future[Unit] = {
+ checkInit()
+ val msg = PutBlock(BlockId(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] = {
--- End diff --
note to reviewer: everything after this line is copied from old
BlockManagerWorker code
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