dongjoon-hyun commented on code in PR #44021: URL: https://github.com/apache/spark/pull/44021#discussion_r1450191904
########## connector/profiler/src/main/scala/org/apache/spark/executor/profiler/ExecutorJVMProfiler.scala: ########## @@ -0,0 +1,183 @@ +/* + * 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.executor.profiler + +import java.io.{BufferedInputStream, FileInputStream, InputStream, IOException} +import java.net.URI +import java.util.concurrent.{ScheduledExecutorService, TimeUnit} + +import one.profiler.{AsyncProfiler, AsyncProfilerLoader} +import org.apache.hadoop.fs.{FileSystem, FSDataOutputStream, Path} + +import org.apache.spark.SparkConf +import org.apache.spark.deploy.SparkHadoopUtil +import org.apache.spark.internal.Logging +import org.apache.spark.util.ThreadUtils + + +/** + * A class that enables the async JVM code profiler + */ +private[spark] class ExecutorJVMProfiler(conf: SparkConf, executorId: String) extends Logging { + + private var running = false + private val enableProfiler = conf.get(EXECUTOR_PROFILING_ENABLED) + private val profilerOptions = conf.get(EXECUTOR_PROFILING_OPTIONS) + private val profilerDfsDir = conf.get(EXECUTOR_PROFILING_DFS_DIR) + private val profilerLocalDir = conf.get(EXECUTOR_PROFILING_LOCAL_DIR) + private val writeInterval = conf.get(EXECUTOR_PROFILING_WRITE_INTERVAL) + + private val startcmd = s"start,$profilerOptions,file=$profilerLocalDir/profile.jfr" + private val stopcmd = s"stop,$profilerOptions,file=$profilerLocalDir/profile.jfr" + private val dumpcmd = s"dump,$profilerOptions,file=$profilerLocalDir/profile.jfr" + private val resumecmd = s"resume,$profilerOptions,file=$profilerLocalDir/profile.jfr" + + private val UPLOAD_SIZE = 8 * 1024 * 1024 // 8 MB + private var outputStream: FSDataOutputStream = _ + private var inputStream: InputStream = _ + private val dataBuffer = new Array[Byte](UPLOAD_SIZE) + private var threadpool: ScheduledExecutorService = _ + private var writing: Boolean = false + + val profiler: Option[AsyncProfiler] = { + Option( + if (enableProfiler && AsyncProfilerLoader.isSupported) AsyncProfilerLoader.load() else null + ) + } + + def start(): Unit = { + if (!running) { + try { + profiler.foreach(p => { + p.execute(startcmd) + logInfo("Executor JVM profiling started.") + running = true + startWriting() + } + ) + } catch { + case e@(_: IllegalArgumentException | _: IllegalStateException | _: IOException) => + logError("JVM profiling aborted. Exception occurred in profiler native code: ", e) + case e: Exception => logWarning("Executor JVM profiling aborted due to exception: ", e) + } + } + } + + /** Stops the profiling and saves output to dfs location. */ + def stop(): Unit = { + if (running) { + profiler.foreach(p => { + p.execute(stopcmd) + logInfo("JVM profiler stopped") + running = false + finishWriting() + }) + } + } + + private def startWriting(): Unit = { + if (profilerDfsDir.isDefined) { + val applicationId = try { + conf.getAppId + } catch { + case _: NoSuchElementException => "local-" + System.currentTimeMillis + } + val config = SparkHadoopUtil.get.newConfiguration(conf) + val appName = conf.get("spark.app.name").replace(" ", "-") + val profilerOutputDirname = profilerDfsDir.get + + val profileOutputFile = + s"$profilerOutputDirname/$applicationId/profile-$appName-exec-$executorId.jfr" + val fs = FileSystem.get(new URI(profileOutputFile), config); + val filenamePath = new Path(profileOutputFile) + outputStream = fs.create(filenamePath) + try { + if (fs.exists(filenamePath)) { + fs.delete(filenamePath, true) + } + logInfo(s"Copying executor profiling file to $profileOutputFile") + inputStream = new BufferedInputStream(new FileInputStream(s"$profilerLocalDir/profile.jfr")) + threadpool = ThreadUtils.newDaemonSingleThreadScheduledExecutor("profilerOutputThread") + threadpool.scheduleWithFixedDelay(new Runnable() { + override def run(): Unit = writeChunk(false) + }, writeInterval, writeInterval, + TimeUnit.SECONDS) Review Comment: The indentation of the above four lines looks weird to me. 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