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Diffstat (limited to 'core/src/main/scala/org/apache/spark/network/netty/client/BlockFetchingClient.scala')
-rw-r--r-- | core/src/main/scala/org/apache/spark/network/netty/client/BlockFetchingClient.scala | 132 |
1 files changed, 0 insertions, 132 deletions
diff --git a/core/src/main/scala/org/apache/spark/network/netty/client/BlockFetchingClient.scala b/core/src/main/scala/org/apache/spark/network/netty/client/BlockFetchingClient.scala deleted file mode 100644 index 3ab13b96d7..0000000000 --- a/core/src/main/scala/org/apache/spark/network/netty/client/BlockFetchingClient.scala +++ /dev/null @@ -1,132 +0,0 @@ -/* - * 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.netty.client - -import java.util.concurrent.TimeoutException - -import com.google.common.base.Charsets.UTF_8 -import io.netty.bootstrap.Bootstrap -import io.netty.buffer.PooledByteBufAllocator -import io.netty.channel.socket.SocketChannel -import io.netty.channel.{ChannelFutureListener, ChannelFuture, ChannelInitializer, ChannelOption} -import io.netty.handler.codec.LengthFieldBasedFrameDecoder -import io.netty.handler.codec.string.StringEncoder - -import org.apache.spark.Logging - -/** - * Client for fetching data blocks from [[org.apache.spark.network.netty.server.BlockServer]]. - * Use [[BlockFetchingClientFactory]] to instantiate this client. - * - * The constructor blocks until a connection is successfully established. - * - * See [[org.apache.spark.network.netty.server.BlockServer]] for client/server protocol. - * - * Concurrency: thread safe and can be called from multiple threads. - */ -@throws[TimeoutException] -private[spark] -class BlockFetchingClient(factory: BlockFetchingClientFactory, hostname: String, port: Int) - extends Logging { - - private val handler = new BlockFetchingClientHandler - - /** Netty Bootstrap for creating the TCP connection. */ - private val bootstrap: Bootstrap = { - val b = new Bootstrap - b.group(factory.workerGroup) - .channel(factory.socketChannelClass) - // Use pooled buffers to reduce temporary buffer allocation - .option(ChannelOption.ALLOCATOR, PooledByteBufAllocator.DEFAULT) - // Disable Nagle's Algorithm since we don't want packets to wait - .option(ChannelOption.TCP_NODELAY, java.lang.Boolean.TRUE) - .option(ChannelOption.SO_KEEPALIVE, java.lang.Boolean.TRUE) - .option[Integer](ChannelOption.CONNECT_TIMEOUT_MILLIS, factory.conf.connectTimeoutMs) - - b.handler(new ChannelInitializer[SocketChannel] { - override def initChannel(ch: SocketChannel): Unit = { - ch.pipeline - .addLast("encoder", new StringEncoder(UTF_8)) - // maxFrameLength = 2G, lengthFieldOffset = 0, lengthFieldLength = 4 - .addLast("framedLengthDecoder", new LengthFieldBasedFrameDecoder(Int.MaxValue, 0, 4)) - .addLast("handler", handler) - } - }) - b - } - - /** Netty ChannelFuture for the connection. */ - private val cf: ChannelFuture = bootstrap.connect(hostname, port) - if (!cf.awaitUninterruptibly(factory.conf.connectTimeoutMs)) { - throw new TimeoutException( - s"Connecting to $hostname:$port timed out (${factory.conf.connectTimeoutMs} ms)") - } - - /** - * Ask the remote server for a sequence of blocks, and execute the callback. - * - * Note that this is asynchronous and returns immediately. Upstream caller should throttle the - * rate of fetching; otherwise we could run out of memory. - * - * @param blockIds sequence of block ids to fetch. - * @param listener callback to fire on fetch success / failure. - */ - def fetchBlocks(blockIds: Seq[String], listener: BlockClientListener): Unit = { - // It's best to limit the number of "write" calls since it needs to traverse the whole pipeline. - // It's also best to limit the number of "flush" calls since it requires system calls. - // Let's concatenate the string and then call writeAndFlush once. - // This is also why this implementation might be more efficient than multiple, separate - // fetch block calls. - var startTime: Long = 0 - logTrace { - startTime = System.nanoTime - s"Sending request $blockIds to $hostname:$port" - } - - blockIds.foreach { blockId => - handler.addRequest(blockId, listener) - } - - val writeFuture = cf.channel().writeAndFlush(blockIds.mkString("\n") + "\n") - writeFuture.addListener(new ChannelFutureListener { - override def operationComplete(future: ChannelFuture): Unit = { - if (future.isSuccess) { - logTrace { - val timeTaken = (System.nanoTime - startTime).toDouble / 1000000 - s"Sending request $blockIds to $hostname:$port took $timeTaken ms" - } - } else { - // Fail all blocks. - val errorMsg = - s"Failed to send request $blockIds to $hostname:$port: ${future.cause.getMessage}" - logError(errorMsg, future.cause) - blockIds.foreach { blockId => - listener.onFetchFailure(blockId, errorMsg) - handler.removeRequest(blockId) - } - } - } - }) - } - - def waitForClose(): Unit = { - cf.channel().closeFuture().sync() - } - - def close(): Unit = cf.channel().close() -} |