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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.
*/
package org.apache.spark.deploy.history
import java.io.FileNotFoundException
import scala.collection.mutable
import org.apache.hadoop.fs.{FileStatus, Path}
import org.apache.spark.{Logging, SecurityManager, SparkConf}
import org.apache.spark.scheduler._
import org.apache.spark.ui.SparkUI
import org.apache.spark.util.Utils
private[history] class FsHistoryProvider(conf: SparkConf) extends ApplicationHistoryProvider
with Logging {
// Interval between each check for event log updates
private val UPDATE_INTERVAL_MS = conf.getInt("spark.history.fs.updateInterval",
conf.getInt("spark.history.updateInterval", 10)) * 1000
private val logDir = conf.get("spark.history.fs.logDirectory", null)
private val resolvedLogDir = Option(logDir)
.map { d => Utils.resolveURI(d) }
.getOrElse { throw new IllegalArgumentException("Logging directory must be specified.") }
private val fs = Utils.getHadoopFileSystem(resolvedLogDir)
// A timestamp of when the disk was last accessed to check for log updates
private var lastLogCheckTimeMs = -1L
// List of applications, in order from newest to oldest.
@volatile private var appList: Seq[ApplicationHistoryInfo] = Nil
/**
* 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.
*
* TODO: Add a mechanism to update manually.
*/
private val logCheckingThread = new Thread("LogCheckingThread") {
override def run() = Utils.logUncaughtExceptions {
while (true) {
val now = getMonotonicTimeMs()
if (now - lastLogCheckTimeMs > UPDATE_INTERVAL_MS) {
Thread.sleep(UPDATE_INTERVAL_MS)
} else {
// If the user has manually checked for logs recently, wait until
// UPDATE_INTERVAL_MS after the last check time
Thread.sleep(lastLogCheckTimeMs + UPDATE_INTERVAL_MS - now)
}
checkForLogs()
}
}
}
initialize()
private def initialize() {
// Validate the log directory.
val path = new Path(resolvedLogDir)
if (!fs.exists(path)) {
throw new IllegalArgumentException(
"Logging directory specified does not exist: %s".format(resolvedLogDir))
}
if (!fs.getFileStatus(path).isDir) {
throw new IllegalArgumentException(
"Logging directory specified is not a directory: %s".format(resolvedLogDir))
}
checkForLogs()
logCheckingThread.setDaemon(true)
logCheckingThread.start()
}
override def getListing() = appList
override def getAppUI(appId: String): SparkUI = {
try {
val appLogDir = fs.getFileStatus(new Path(resolvedLogDir.toString, appId))
val (_, ui) = loadAppInfo(appLogDir, renderUI = true)
ui
} catch {
case e: FileNotFoundException => null
}
}
override def getConfig(): Map[String, String] =
Map("Event Log Location" -> resolvedLogDir.toString)
/**
* Builds the application list based on the current contents of the log directory.
* Tries to reuse as much of the data already in memory as possible, by not reading
* applications that haven't been updated since last time the logs were checked.
*/
private def checkForLogs() = {
lastLogCheckTimeMs = getMonotonicTimeMs()
logDebug("Checking for logs. Time is now %d.".format(lastLogCheckTimeMs))
try {
val logStatus = fs.listStatus(new Path(resolvedLogDir))
val logDirs = if (logStatus != null) logStatus.filter(_.isDir).toSeq else Seq[FileStatus]()
val logInfos = logDirs.filter { dir =>
fs.isFile(new Path(dir.getPath, EventLoggingListener.APPLICATION_COMPLETE))
}
val currentApps = Map[String, ApplicationHistoryInfo](
appList.map(app => app.id -> app):_*)
// For any application that either (i) is not listed or (ii) has changed since the last time
// the listing was created (defined by the log dir's modification time), load the app's info.
// Otherwise just reuse what's already in memory.
val newApps = new mutable.ArrayBuffer[ApplicationHistoryInfo](logInfos.size)
for (dir <- logInfos) {
val curr = currentApps.getOrElse(dir.getPath().getName(), null)
if (curr == null || curr.lastUpdated < getModificationTime(dir)) {
try {
val (app, _) = loadAppInfo(dir, renderUI = false)
newApps += app
} catch {
case e: Exception => logError(s"Failed to load app info from directory $dir.")
}
} else {
newApps += curr
}
}
appList = newApps.sortBy { info => -info.endTime }
} catch {
case t: Throwable => logError("Exception in checking for event log updates", t)
}
}
/**
* Parse the application's logs to find out the information we need to build the
* listing page.
*
* When creating the listing of available apps, there is no need to load the whole UI for the
* application. The UI is requested by the HistoryServer (by calling getAppInfo()) when the user
* clicks on a specific application.
*
* @param logDir Directory with application's log files.
* @param renderUI Whether to create the SparkUI for the application.
* @return A 2-tuple `(app info, ui)`. `ui` will be null if `renderUI` is false.
*/
private def loadAppInfo(logDir: FileStatus, renderUI: Boolean) = {
val path = logDir.getPath
val appId = path.getName
val elogInfo = EventLoggingListener.parseLoggingInfo(path, fs)
val replayBus = new ReplayListenerBus(elogInfo.logPaths, fs, elogInfo.compressionCodec)
val appListener = new ApplicationEventListener
replayBus.addListener(appListener)
val ui: SparkUI = if (renderUI) {
val conf = this.conf.clone()
val appSecManager = new SecurityManager(conf)
new SparkUI(conf, appSecManager, replayBus, appId,
HistoryServer.UI_PATH_PREFIX + s"/$appId")
// Do not call ui.bind() to avoid creating a new server for each application
} else {
null
}
replayBus.replay()
val appInfo = ApplicationHistoryInfo(
appId,
appListener.appName,
appListener.startTime,
appListener.endTime,
getModificationTime(logDir),
appListener.sparkUser)
if (ui != null) {
val uiAclsEnabled = conf.getBoolean("spark.history.ui.acls.enable", false)
ui.getSecurityManager.setUIAcls(uiAclsEnabled)
ui.getSecurityManager.setViewAcls(appListener.sparkUser, appListener.viewAcls)
}
(appInfo, ui)
}
/** Return when this directory was last modified. */
private def getModificationTime(dir: FileStatus): Long = {
try {
val logFiles = fs.listStatus(dir.getPath)
if (logFiles != null && !logFiles.isEmpty) {
logFiles.map(_.getModificationTime).max
} else {
dir.getModificationTime
}
} catch {
case t: Throwable =>
logError("Exception in accessing modification time of %s".format(dir.getPath), t)
-1L
}
}
/** Returns the system's mononotically increasing time. */
private def getMonotonicTimeMs() = System.nanoTime() / (1000 * 1000)
}
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