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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