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Signed-off-by: Weichen Xu <[email protected]>
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core/src/main/scala/org/apache/spark/api/python/CachedArrowBatchServer.scala
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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. | ||
| */ | ||
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| package org.apache.spark.api.python | ||
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| import java.io.{BufferedOutputStream, DataInputStream, DataOutputStream} | ||
| import java.net.{InetAddress, ServerSocket, Socket, SocketException} | ||
| import java.nio.charset.StandardCharsets.UTF_8 | ||
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| import org.apache.spark.SparkConf | ||
| import org.apache.spark.internal.Logging | ||
| import org.apache.spark.network.util.JavaUtils | ||
| import org.apache.spark.security.SocketAuthHelper | ||
| import org.apache.spark.storage.{ArrowBatchBlockId, BlockId, BlockManager} | ||
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| /** | ||
| * A helper class to run cached arrow batch server. | ||
| * Cached arrow batch server is for serving chunk data, when user calls | ||
| * `pyspark.sql.chunk.readChunk` API, it creates connection to this server, | ||
| * then sends chunk_id to the server, then the server responses chunk binary data | ||
| * to client. | ||
| * The server queries chuck data using chunk_id from block manager, | ||
| * for chunk data storage logic, please refer to | ||
| * `PersistDataFrameAsArrowBatchChunksPartitionEvaluator` class. | ||
| */ | ||
| class CachedArrowBatchServer( | ||
| val sparkConf: SparkConf, | ||
| val blockManager: BlockManager | ||
| ) extends Logging { | ||
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| val authHelper = new SocketAuthHelper(sparkConf) | ||
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| val serverSocket = new ServerSocket( | ||
| 0, 1, InetAddress.getLoopbackAddress() | ||
| ) | ||
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| protected def readUtf8(s: Socket): String = { | ||
| val din = new DataInputStream(s.getInputStream()) | ||
| val len = din.readInt() | ||
| val bytes = new Array[Byte](len) | ||
| din.readFully(bytes) | ||
| new String(bytes, UTF_8) | ||
| } | ||
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| protected def writeUtf8(str: String, s: Socket): Unit = { | ||
| val bytes = str.getBytes(UTF_8) | ||
| val dout = new DataOutputStream(s.getOutputStream()) | ||
| dout.writeInt(bytes.length) | ||
| dout.write(bytes, 0, bytes.length) | ||
| dout.flush() | ||
| } | ||
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| private def handleConnection(sock: Socket): Unit = { | ||
| val blockId = BlockId(readUtf8(sock)) | ||
| assert(blockId.isInstanceOf[ArrowBatchBlockId]) | ||
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| var errMessage = "ok" | ||
| var blockDataOpt: Option[Array[Byte]] = None | ||
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| try { | ||
| val blockResult = blockManager.get[Array[Byte]](blockId) | ||
| if (blockResult.isDefined) { | ||
| blockDataOpt = Some(blockResult.get.data.next().asInstanceOf[Array[Byte]]) | ||
| } else { | ||
| errMessage = s"The chunk $blockId data cache does not exist or has been removed" | ||
| } | ||
| } catch { | ||
| case e: Exception => | ||
| errMessage = e.getMessage | ||
| } | ||
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| writeUtf8(errMessage, sock) | ||
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| if (blockDataOpt.isDefined) { | ||
| val out = new BufferedOutputStream(sock.getOutputStream()) | ||
| out.write(blockDataOpt.get) | ||
| out.flush() | ||
| } | ||
| } | ||
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| def createConnectionThread(sock: Socket, threadName: String): Unit = { | ||
| new Thread(threadName) { | ||
| setDaemon(true) | ||
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| override def run(): Unit = { | ||
| try { | ||
| authHelper.authClient(sock) | ||
| handleConnection(sock) | ||
| } finally { | ||
| JavaUtils.closeQuietly(sock) | ||
| } | ||
| } | ||
| }.start() | ||
| } | ||
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| def start(): Unit = { | ||
| logTrace("Creating listening socket") | ||
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| new Thread("CachedArrowBatchServer-listener") { | ||
| setDaemon(true) | ||
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| override def run(): Unit = { | ||
| var sock: Socket = null | ||
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| var connectionCount = 0 | ||
| try { | ||
| while (true) { | ||
| sock = serverSocket.accept() | ||
| connectionCount += 1 | ||
| createConnectionThread( | ||
| sock, s"CachedArrowBatchServer-connection-$connectionCount" | ||
| ) | ||
| } | ||
| } catch { | ||
| case e: SocketException => | ||
| // if serverSocket is closed, it means the server is shut down. | ||
| // swallow the exception. | ||
| if (!serverSocket.isClosed) { | ||
| throw e | ||
| } | ||
| } finally { | ||
| logTrace("Closing server") | ||
| JavaUtils.closeQuietly(serverSocket) | ||
| } | ||
| } | ||
| }.start() | ||
| } | ||
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| def stop(): Unit = { | ||
| JavaUtils.closeQuietly(serverSocket) | ||
| } | ||
| } |
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