Github user pwendell commented on a diff in the pull request:
https://github.com/apache/spark/pull/204#discussion_r11459225
--- Diff:
core/src/main/scala/org/apache/spark/deploy/history/HistoryServer.scala ---
@@ -0,0 +1,322 @@
+/*
+ * 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.deploy.history
+
+import javax.servlet.http.HttpServletRequest
+
+import scala.collection.mutable
+
+import org.apache.hadoop.fs.{FileStatus, Path}
+import org.eclipse.jetty.servlet.ServletContextHandler
+
+import org.apache.spark.{Logging, SecurityManager, SparkConf}
+import org.apache.spark.deploy.SparkUIContainer
+import org.apache.spark.ui.SparkUI
+import org.apache.spark.ui.JettyUtils._
+import org.apache.spark.util.Utils
+import org.apache.spark.scheduler.{ApplicationEventListener,
ReplayListenerBus}
+
+/**
+ * A web server that renders SparkUIs of finished applications.
+ *
+ * For the standalone mode, MasterWebUI already achieves this
functionality. Thus, the
+ * main use case of the HistoryServer is in other deploy modes (e.g. Yarn
or Mesos).
+ *
+ * The logging directory structure is as follows: Within the given base
directory, each
+ * application's event logs are maintained in the application's own
sub-directory. This
+ * is the same structure as maintained in the event log write code path in
+ * EventLoggingListener.
+ *
+ * @param baseLogDir The base directory in which event logs are found
+ * @param requestedPort The requested port to which this server is to be
bound
+ */
+class HistoryServer(
+ val baseLogDir: String,
+ requestedPort: Int,
+ conf: SparkConf)
+ extends SparkUIContainer("History Server") with Logging {
+
+ import HistoryServer._
+
+ private val fileSystem = Utils.getHadoopFileSystem(baseLogDir)
+ private val localHost = Utils.localHostName()
+ private val publicHost =
Option(System.getenv("SPARK_PUBLIC_DNS")).getOrElse(localHost)
+ private val port = requestedPort
+ private val securityManager = new SecurityManager(conf)
+ private val indexPage = new IndexPage(this)
+
+ // A timestamp of when the disk was last accessed to check for log
updates
+ private var lastLogCheckTime = -1L
+
+ // If an application is last updated after this threshold, then its UI
is retained
+ private var updateTimeThreshold = -1L
+
+ // Number of applications hidden from the UI because the application
limit has been reached
+ private var numApplicationsHidden = 0
+
+ @volatile private var stopped = false
+
+ /**
+ * A background thread that periodically checks for event log updates on
disk.
+ *
+ * If a log check is invoked manually in the middle of a period, this
thread re-adjusts the
+ * time at which it performs the next log check to maintain the same
period as before.
+ */
+ private val logCheckingThread = new Thread {
+ override def run() {
+ while (!stopped) {
+ val now = System.currentTimeMillis
+ if (now - lastLogCheckTime > UPDATE_INTERVAL_MS) {
+ checkForLogs()
+ Thread.sleep(UPDATE_INTERVAL_MS)
+ } else {
+ // If the user has manually checked for logs recently, wait until
--- End diff --
oops - sorry I see the TODO
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