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From vanzin <...@git.apache.org>
Subject [GitHub] spark pull request: SPARK-1537 [WiP] Application Timeline Server i...
Date Fri, 26 Jun 2015 21:07:49 GMT
Github user vanzin commented on a diff in the pull request:

    https://github.com/apache/spark/pull/5423#discussion_r33396084
  
    --- Diff: yarn/history/src/main/scala/org/apache/spark/deploy/history/yarn/YarnHistoryProvider.scala
---
    @@ -0,0 +1,1015 @@
    +/*
    + * 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.yarn
    +
    +import java.io.FileNotFoundException
    +import java.net.URI
    +import java.util.Date
    +import java.util.concurrent.LinkedBlockingQueue
    +import java.util.concurrent.atomic.{AtomicLong, AtomicBoolean}
    +import java.util.zip.ZipOutputStream
    +
    +import scala.collection.JavaConversions._
    +
    +import org.apache.hadoop.security.UserGroupInformation
    +import org.apache.hadoop.yarn.api.records.timeline.TimelineEntity
    +import org.apache.hadoop.yarn.conf.YarnConfiguration
    +
    +import org.apache.spark.deploy.SparkHadoopUtil
    +import org.apache.spark.deploy.history.yarn.YarnTimelineUtils._
    +import org.apache.spark.deploy.history.yarn.rest.{JerseyBinding, TimelineQueryClient}
    +import org.apache.spark.deploy.history.{ApplicationHistoryInfo, ApplicationHistoryProvider,
HistoryServer}
    +import org.apache.spark.scheduler.{ApplicationEventListener, SparkListenerBus}
    +import org.apache.spark.ui.SparkUI
    +import org.apache.spark.{SparkException, Logging, SecurityManager, SparkConf}
    +
    +/**
    + * A  History provider which reads in the history from
    + * the YARN Timeline Service.
    + *
    + * The service is a remote HTTP service, so failure modes are
    + * different from simple file IO.
    + *
    + * 1. Application listings are asynchronous, and made on a schedule, though
    + * they can be forced (and the schedule disabled).
    + * 2. The results are cached and can be retrieved with [[getApplications()]].
    + * 3. The most recent failure of any operation is stored,
    + * The [[getLastFailure()]] call will return the last exception
    + * or `None`. It is shared across threads so is primarily there for
    + * tests and basic diagnostics.
    + * 4. Listing the details of a single application in [[getAppUI()]]
    + * is synchronous and *not* cached.
    + * 5. the [[maybeCheckHealth()]] call performs a health check as the initial
    + * binding operation of this instance. This call invokes [[TimelineQueryClient.healthCheck()]]
    + * for better diagnostics on binding failures -particularly configuration problems.
    + * 6. Every REST call, synchronous or asynchronous, will invoke [[maybeCheckHealth()]]
until
    + * the health check eventually succeeds.
    + * <p>
    + * If the timeline is  not enabled, the API calls used by the web UI
    + * downgrade gracefully (returning empty entries), rather than fail.
    + * 
    + *
    + * @param sparkConf configuration of the provider
    + */
    +private[spark] class YarnHistoryProvider(sparkConf: SparkConf)
    +  extends ApplicationHistoryProvider with Logging {
    +
    +  /**
    +   * The configuration here is a YarnConfiguration built off the spark configuration
    +   * supplied in the constructor; this operation ensures that `yarn-default.xml`
    +   * and `yarn-site.xml` are pulled in. Options in the spark conf will override
    +   * those in the -default and -site XML resources which are not marked as final.
    +   */
    +  private val yarnConf = {
    +    new YarnConfiguration(SparkHadoopUtil.get.newConfiguration(sparkConf))
    +  }
    +
    +  /**
    +   * UI ACL option
    +   */
    +  private val uiAclsEnabled = sparkConf.getBoolean("spark.history.ui.acls.enable", false)
    +
    +  private val detailedInfo = sparkConf.getBoolean(YarnHistoryProvider.OPTION_DETAILED_INFO,
false)
    +  private val NOT_STARTED = "<Not Started>"
    +
    +  /* minimum interval between each check for event log updates */
    +  private val refreshInterval = sparkConf.getLong(YarnHistoryProvider.OPTION_MIN_REFRESH_INTERVAL,
    +    YarnHistoryProvider.DEFAULT_MIN_REFRESH_INTERVAL_SECONDS) * 1000
    +
    +  /**
    +   * Window limit in milliseconds
    +   */
    +  private val windowLimitMs = sparkConf.getLong(YarnHistoryProvider.OPTION_WINDOW_LIMIT,
    +    YarnHistoryProvider.DEFAULT_WINDOW_LIMIT) * 1000
    +
    +  /**
    +   * Number of events to get
    +   */
    +  private val eventFetchLimit = sparkConf.getLong(YarnHistoryProvider.OPTION_EVENT_FETCH_LIMIT,
    +    YarnHistoryProvider.DEFAULT_EVENT_FETCH_LIMIT)
    +
    +  private val eventFetchOption: Option[Long] = if (eventFetchLimit > 0) Some(eventFetchLimit)
else None
    +
    +  /**
    +   * Start time. Doesn't use the `now` call as tests can subclass that and
    +   * it won't be valid until after the subclass has been constructed
    +   */
    +  val serviceStartTime = System.currentTimeMillis()
    +
    +  /**
    +   * Timeline endpoint URI
    +   */
    +  protected val timelineEndpoint = createTimelineEndpoint()
    +
    +  /**
    +   * The timeline query client which uses the `jersey`
    +   * Jersey instance to talk to a timeline service running
    +   * at [[timelineEndpoint]], and creates a timeline (write) client instance
    +   * to handle token renewal
    +   *
    +   */
    +  protected val timelineQueryClient = {
    +    createTimelineQueryClient()
    +  }
    +
    +
    +  /**
    +   * Override point: create the timeline endpoint
    +   * @return a URI to the timeline web service
    +   */
    +  protected def createTimelineEndpoint(): URI = {
    +    getTimelineEndpoint(yarnConf)
    +  }
    +
    +  /**
    +   * Override point: create the timeline query client.
    +   * This is called during instance creation.
    +   * @return a timeline query client ot use for the duration
    +   *         of this instance
    +   */
    +  protected def createTimelineQueryClient(): TimelineQueryClient = {
    +    new TimelineQueryClient(timelineEndpoint, yarnConf, JerseyBinding.createClientConfig())
    +  }
    +
    +  /**
    +   * The empty listing, with a timestamp to indicate that the listing
    +   * has never taken place.
    +   */
    +  private val emptyListing = new ApplicationListingResults(0, Nil, None)
    +
    +  /**
    +   * List of applications. Initial result is empty
    +   */
    +  private var applications: ApplicationListingResults = emptyListing
    +  
    +  /**
    +   * Last exception seen and when
    +   */
    +  protected var lastFailureCause: Option[(Throwable, Date)] = None
    +
    +  private val refreshCount = new AtomicLong(0)
    +  private val refreshFailedCount = new AtomicLong(0)
    +
    +  /**
    +   * Health marker
    +   */
    +  private val healthy = new AtomicBoolean(false)
    +
    +  /**
    +   * Enabled flag
    +   */
    +  private val _enabled = timelineServiceEnabled(yarnConf)
    +
    +  /**
    +   * Atomic boolean used to signal to the refresh thread that it
    +   * must exit its loop.
    +   */
    +  private val stopRefresh = new AtomicBoolean(false)
    +
    +  /**
    +   * refresher
    +   */
    +  val refresher = new Refresher()
    +
    +  /**
    +   * Initialize the provider
    +   */
    +  init()
    +
    +  /**
    +   * Check the configuration and log whether or not it is enabled;
    +   * if it is enabled then the URL is logged too.
    +   */
    +  private def init(): Unit = {
    +    if (!enabled) {
    +      logError(YarnHistoryProvider.TEXT_SERVICE_DISABLED)
    +    } else {
    +      logInfo(YarnHistoryProvider.TEXT_SERVICE_ENABLED)
    +      logInfo(YarnHistoryProvider.KEY_SERVICE_URL + ": " + timelineEndpoint)
    +      logDebug(sparkConf.toDebugString)
    +      // get the thread time
    +      logInfo(s"refresh interval $refreshInterval milliseconds")
    +      if (refreshInterval < 0) {
    +        throw new Exception(YarnHistoryProvider.TEXT_INVALID_UPDATE_INTERVAL +
    +            s": ${refreshInterval/1000}")
    +      }
    +      startRefreshThread()
    +    }
    +  }
    +
    +
    +  /**
    +   * Stop the service. After this point operations will fail.
    +   */
    +  override def stop(): Unit = {
    +    logDebug(s"Stopping $this")
    +    // attempt to stop the refresh thread
    +    if (!stopRefreshThread()) {
    +      closeQueryClient()
    +    }
    +
    +  }
    +
    +  /**
    +   * Close the query client
    +   */
    +  def closeQueryClient(): Unit = {
    +    // and otherwise, stop the query client
    +    logDebug("Stopping Timeline client")
    +    timelineQueryClient.close()
    +  }
    +
    +  /**
    +   * Is the timeline service (and therefore this provider) enabled.
    +   * (override point for tests).
    +   *
    +   * Important: this is called during construction, so test-time subclasses
    +   * will be invoked before their own construction has taken place.
    +   * Code appropriately.
    +   * @return true if the provider/YARN configuration enables the timeline
    +   *         service.
    +   */
    +  def enabled: Boolean = {
    +    _enabled
    +  }
    +  
    +  /**
    +   * Get the timeline query client. Used internally to ease testing
    +   * @return the client.
    +   */
    +  def getTimelineQueryClient(): TimelineQueryClient = {
    +    timelineQueryClient
    +  }
    +
    +  /**
    +   * Set the last exception
    +   * @param ex exception seen
    +   */
    +  private def setLastFailure(ex: Throwable): Unit = {
    +    setLastFailure(ex, now())
    +  }
    +
    +  /**
    +   * Set the last exception
    +   * @param ex exception seen
    +   * @param timestamp the timestamp of the failure
    +   */
    +  private def setLastFailure(ex: Throwable, timestamp: Long): Unit = {
    +    this.synchronized {
    +      lastFailureCause = Some(ex, new Date(timestamp))
    +    }
    +  }
    +
    +  /**
    +   * Reset the failure info
    +   */
    +  private def resetLastFailure(): Unit = {
    --- End diff --
    
    a shorthand version for this would be:
    
        private def resetLastFailure(): Unit = synchronized {
          // code
        }



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