Github user andrewor14 commented on a diff in the pull request: https://github.com/apache/spark/pull/42#discussion_r10580179 --- Diff: core/src/main/scala/org/apache/spark/scheduler/SparkReplayerBus.scala --- @@ -0,0 +1,97 @@ +/* + * 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.scheduler + +import java.io.InputStream + +import scala.io.Source + +import it.unimi.dsi.fastutil.io.FastBufferedInputStream +import org.apache.hadoop.fs.{Path, FileSystem} +import org.json4s.jackson.JsonMethods._ + +import org.apache.spark.{Logging, SparkConf} +import org.apache.spark.io.CompressionCodec +import org.apache.spark.util.{JsonProtocol, Utils} + +/** + * An EventBus that replays logged events from persisted storage + */ +private[spark] class SparkReplayerBus(conf: SparkConf) extends EventBus with Logging { + private val compressed = conf.getBoolean("spark.eventLog.compress", false) + + // Only used if compression is enabled + private lazy val compressionCodec = CompressionCodec.createCodec(conf) + + /** + * Return a list of paths representing log files in the given directory. + */ + private def getLogFilePaths(logDir: String, fileSystem: FileSystem): Array[Path] = { + val path = new Path(logDir) + if (!fileSystem.exists(path) || !fileSystem.getFileStatus(path).isDir) { + logWarning("Log path provided is not a valid directory: %s".format(logDir)) + return Array[Path]() + } + val logStatus = fileSystem.listStatus(path) + if (logStatus == null || !logStatus.exists(!_.isDir)) { + logWarning("Log path provided contains no log files: %s".format(logDir)) + return Array[Path]() + } + logStatus.filter(!_.isDir).map(_.getPath).sortBy(_.getName) + } + + /** + * Replay each event in the order maintained in the given logs. + */ + def replay(logDir: String): Boolean = { + val fileSystem = Utils.getHadoopFileSystem(logDir) + val logPaths = getLogFilePaths(logDir, fileSystem) + if (logPaths.length == 0) { + return false + } + + logPaths.foreach { path => + // In case there is an exception, keep track of the highest level stream to close it later + var streamToClose: Option[InputStream] = None + var currentLine = "" + try { + val fstream = fileSystem.open(path) + val bstream = new FastBufferedInputStream(fstream) + val cstream = if (compressed) compressionCodec.compressedInputStream(bstream) else bstream + streamToClose = Some(cstream) + + // Parse each line as an event and post it to all attached listeners + val lines = Source.fromInputStream(cstream).getLines() + lines.foreach { line => + currentLine = line + val event = JsonProtocol.sparkEventFromJson(parse(line)) + postToAll(event) + } + } catch { + case e: Exception => + logWarning("Exception in parsing UI logs for %s".format(path)) --- End diff -- Oops. That was left over from before I moved it.
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