[SPARK-2384] Add tooltips to UI.

This patch adds tooltips to clarify some points of confusion in the UI.  When users mouse over some of the table headers (shuffle read, write, and input size) as well as over the "scheduler delay" metric shown for each stage, a black tool tip (see image below) pops up describing the metric in more detail.  After the tooltip mechanism is added by this commit, I imagine others may want to add more tooltips for other things in the UI, but I think this is a good starting point.

![tooltip](https://cloud.githubusercontent.com/assets/1108612/3491905/994e179e-059f-11e4-92f2-c6c12d248d81.jpg)

This looks scary-big but much of it is adding the bootstrap tool tip JavaScript.

Also I have no idea what to put for the license in tooltip (I left it the same -- the Twitter apache header) or for JQuery (left it as nothing) -- @mateiz what's the right thing here?

cc @pwendell @andrewor14 @rxin

Author: Kay Ousterhout <kayousterhout@gmail.com>

Closes #1314 from kayousterhout/tooltips and squashes the following commits:

19981b5 [Kay Ousterhout] Exclude non-licensed javascript files from style check
d9ab5a9 [Kay Ousterhout] Response to Andrew's review
7752449 [Kay Ousterhout] [SPARK-2384] Add tooltips to UI.

11 files changed, 491 insertions, 93 deletions

diff --git a/.rat-excludes b/.rat-excludes
index 796c32a808..372bc2587c 100644
--- a/.rat-excludes
+++ b/.rat-excludes
@@ -22,6 +22,8 @@ slaves
 spark-env.sh
 spark-env.sh.template
 log4j-defaults.properties
+bootstrap-tooltip.js
+jquery-1.11.1.min.js
 sorttable.js
 .*txt
 .*json
diff --git a/core/src/main/resources/org/apache/spark/ui/static/bootstrap-tooltip.js b/core/src/main/resources/org/apache/spark/ui/static/bootstrap-tooltip.js
new file mode 100644
index 0000000000..2934181c10
--- /dev/null
+++ b/core/src/main/resources/org/apache/spark/ui/static/bootstrap-tooltip.js
@@ -0,0 +1,288 @@
+/* ===========================================================
+ * bootstrap-tooltip.js v2.2.2
+ * http://twitter.github.com/bootstrap/javascript.html#tooltips
+ * Inspired by the original jQuery.tipsy by Jason Frame
+ * ===========================================================
+ * Copyright 2012 Twitter, Inc.
+ *
+ * Licensed 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.
+ * ========================================================== */
+
+
+!function ($) {
+
+  "use strict"; // jshint ;_;
+
+
+ /* TOOLTIP PUBLIC CLASS DEFINITION
+  * =============================== */
+
+  var Tooltip = function (element, options) {
+    this.init('tooltip', element, options)
+  }
+
+  Tooltip.prototype = {
+
+    constructor: Tooltip
+
+  , init: function (type, element, options) {
+      var eventIn
+        , eventOut
+
+      this.type = type
+      this.$element = $(element)
+      this.options = this.getOptions(options)
+      this.enabled = true
+
+      if (this.options.trigger == 'click') {
+        this.$element.on('click.' + this.type, this.options.selector, $.proxy(this.toggle, this))
+      } else if (this.options.trigger != 'manual') {
+        eventIn = this.options.trigger == 'hover' ? 'mouseenter' : 'focus'
+        eventOut = this.options.trigger == 'hover' ? 'mouseleave' : 'blur'
+        this.$element.on(eventIn + '.' + this.type, this.options.selector, $.proxy(this.enter, this))
+        this.$element.on(eventOut + '.' + this.type, this.options.selector, $.proxy(this.leave, this))
+      }
+
+      this.options.selector ?
+        (this._options = $.extend({}, this.options, { trigger: 'manual', selector: '' })) :
+        this.fixTitle()
+    }
+
+  , getOptions: function (options) {
+      options = $.extend({}, $.fn[this.type].defaults, options, this.$element.data())
+
+      if (options.delay && typeof options.delay == 'number') {
+        options.delay = {
+          show: options.delay
+        , hide: options.delay
+        }
+      }
+
+      return options
+    }
+
+  , enter: function (e) {
+      var self = $(e.currentTarget)[this.type](this._options).data(this.type)
+
+      if (!self.options.delay || !self.options.delay.show) return self.show()
+
+      clearTimeout(this.timeout)
+      self.hoverState = 'in'
+      this.timeout = setTimeout(function() {
+        if (self.hoverState == 'in') self.show()
+      }, self.options.delay.show)
+    }
+
+  , leave: function (e) {
+      var self = $(e.currentTarget)[this.type](this._options).data(this.type)
+
+      if (this.timeout) clearTimeout(this.timeout)
+      if (!self.options.delay || !self.options.delay.hide) return self.hide()
+
+      self.hoverState = 'out'
+      this.timeout = setTimeout(function() {
+        if (self.hoverState == 'out') self.hide()
+      }, self.options.delay.hide)
+    }
+
+  , show: function () {
+      var $tip
+        , inside
+        , pos
+        , actualWidth
+        , actualHeight
+        , placement
+        , tp
+
+      if (this.hasContent() && this.enabled) {
+        $tip = this.tip()
+        this.setContent()
+
+        if (this.options.animation) {
+          $tip.addClass('fade')
+        }
+
+        placement = typeof this.options.placement == 'function' ?
+          this.options.placement.call(this, $tip[0], this.$element[0]) :
+          this.options.placement
+
+        inside = /in/.test(placement)
+
+        $tip
+          .detach()
+          .css({ top: 0, left: 0, display: 'block' })
+          .insertAfter(this.$element)
+
+        pos = this.getPosition(inside)
+
+        actualWidth = $tip[0].offsetWidth
+        actualHeight = $tip[0].offsetHeight
+
+        switch (inside ? placement.split(' ')[1] : placement) {
+          case 'bottom':
+            tp = {top: pos.top + pos.height, left: pos.left + pos.width / 2 - actualWidth / 2}
+            break
+          case 'top':
+            tp = {top: pos.top - actualHeight, left: pos.left + pos.width / 2 - actualWidth / 2}
+            break
+          case 'left':
+            tp = {top: pos.top + pos.height / 2 - actualHeight / 2, left: pos.left - actualWidth}
+            break
+          case 'right':
+            tp = {top: pos.top + pos.height / 2 - actualHeight / 2, left: pos.left + pos.width}
+            break
+        }
+
+        $tip
+          .offset(tp)
+          .addClass(placement)
+          .addClass('in')
+      }
+    }
+
+  , setContent: function () {
+      var $tip = this.tip()
+        , title = this.getTitle()
+
+      $tip.find('.tooltip-inner')[this.options.html ? 'html' : 'text'](title)
+      $tip.removeClass('fade in top bottom left right')
+    }
+
+  , hide: function () {
+      var that = this
+        , $tip = this.tip()
+
+      $tip.removeClass('in')
+
+      function removeWithAnimation() {
+        var timeout = setTimeout(function () {
+          $tip.off($.support.transition.end).detach()
+        }, 500)
+
+        $tip.one($.support.transition.end, function () {
+          clearTimeout(timeout)
+          $tip.detach()
+        })
+      }
+
+      $.support.transition && this.$tip.hasClass('fade') ?
+        removeWithAnimation() :
+        $tip.detach()
+
+      return this
+    }
+
+  , fixTitle: function () {
+      var $e = this.$element
+      if ($e.attr('title') || typeof($e.attr('data-original-title')) != 'string') {
+        $e.attr('data-original-title', $e.attr('title') || '').attr('title', '')
+      }
+    }
+
+  , hasContent: function () {
+      return this.getTitle()
+    }
+
+  , getPosition: function (inside) {
+      return $.extend({}, (inside ? {top: 0, left: 0} : this.$element.offset()), {
+        width: this.$element[0].offsetWidth
+      , height: this.$element[0].offsetHeight
+      })
+    }
+
+  , getTitle: function () {
+      var title
+        , $e = this.$element
+        , o = this.options
+
+      title = $e.attr('data-original-title')
+        || (typeof o.title == 'function' ? o.title.call($e[0]) :  o.title)
+
+      return title
+    }
+
+  , tip: function () {
+      return this.$tip = this.$tip || $(this.options.template)
+    }
+
+  , validate: function () {
+      if (!this.$element[0].parentNode) {
+        this.hide()
+        this.$element = null
+        this.options = null
+      }
+    }
+
+  , enable: function () {
+      this.enabled = true
+    }
+
+  , disable: function () {
+      this.enabled = false
+    }
+
+  , toggleEnabled: function () {
+      this.enabled = !this.enabled
+    }
+
+  , toggle: function (e) {
+      var self = $(e.currentTarget)[this.type](this._options).data(this.type)
+      self[self.tip().hasClass('in') ? 'hide' : 'show']()
+    }
+
+  , destroy: function () {
+      this.hide().$element.off('.' + this.type).removeData(this.type)
+    }
+
+  }
+
+
+ /* TOOLTIP PLUGIN DEFINITION
+  * ========================= */
+
+  var old = $.fn.tooltip
+
+  $.fn.tooltip = function ( option ) {
+    return this.each(function () {
+      var $this = $(this)
+        , data = $this.data('tooltip')
+        , options = typeof option == 'object' && option
+      if (!data) $this.data('tooltip', (data = new Tooltip(this, options)))
+      if (typeof option == 'string') data[option]()
+    })
+  }
+
+  $.fn.tooltip.Constructor = Tooltip
+
+  $.fn.tooltip.defaults = {
+    animation: true
+  , placement: 'top'
+  , selector: false
+  , template: '<div class="tooltip"><div class="tooltip-arrow"></div><div class="tooltip-inner"></div></div>'
+  , trigger: 'hover'
+  , title: ''
+  , delay: 0
+  , html: false
+  }
+
+
+ /* TOOLTIP NO CONFLICT
+  * =================== */
+
+  $.fn.tooltip.noConflict = function () {
+    $.fn.tooltip = old
+    return this
+  }
+
+}(window.jQuery);
+
diff --git a/core/src/main/resources/org/apache/spark/ui/static/initialize-tooltips.js b/core/src/main/resources/org/apache/spark/ui/static/initialize-tooltips.js
new file mode 100644
index 0000000000..70f355dfb4
--- /dev/null
+++ b/core/src/main/resources/org/apache/spark/ui/static/initialize-tooltips.js
@@ -0,0 +1,21 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+$(document).ready(function(){
+   $("[data-toggle=tooltip]").tooltip({container: 'body'});
+});
+
diff --git a/core/src/main/resources/org/apache/spark/ui/static/jquery-1.11.1.min.js b/core/src/main/resources/org/apache/spark/ui/static/jquery-1.11.1.min.js
new file mode 100644
index 0000000000..ab28a24729
--- /dev/null
+++ b/core/src/main/resources/org/apache/spark/ui/static/jquery-1.11.1.min.js
@@ -0,0 +1,4 @@
+/*! jQuery v1.11.1 | (c) 2005, 2014 jQuery Foundation, Inc. | jquery.org/license */
+!function(a,b){"object"==typeof module&&"object"==typeof module.exports?module.exports=a.document?b(a,!0):function(a){if(!a.document)throw new Error("jQuery requires a window with a document");return b(a)}:b(a)}("undefined"!=typeof window?window:this,function(a,b){var c=[],d=c.slice,e=c.concat,f=c.push,g=c.indexOf,h={},i=h.toString,j=h.hasOwnProperty,k={},l="1.11.1",m=function(a,b){return new m.fn.init(a,b)},n=/^[\s\uFEFF\xA0]+|[\s\uFEFF\xA0]+$/g,o=/^-ms-/,p=/-([\da-z])/gi,q=function(a,b){return b.toUpperCase()};m.fn=m.prototype={jquery:l,constructor:m,selector:"",length:0,toArray:function(){return d.call(this)},get:function(a){return null!=a?0>a?this[a+this.length]:this[a]:d.call(this)},pushStack:function(a){var b=m.merge(this.constructor(),a);return b.prevObject=this,b.context=this.context,b},each:function(a,b){return m.each(this,a,b)},map:function(a){return this.pushStack(m.map(this,function(b,c){return a.call(b,c,b)}))},slice:function(){return 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diff --git a/core/src/main/resources/org/apache/spark/ui/static/webui.css b/core/src/main/resources/org/apache/spark/ui/static/webui.css
index 11fd956bfb..7448af87fc 100644
--- a/core/src/main/resources/org/apache/spark/ui/static/webui.css
+++ b/core/src/main/resources/org/apache/spark/ui/static/webui.css
@@ -112,3 +112,8 @@ pre {
   padding-bottom: 0;
   border: none;
 }
+
+.tooltip {
+ font-weight: normal;
+}
+
diff --git a/core/src/main/scala/org/apache/spark/ui/ToolTips.scala b/core/src/main/scala/org/apache/spark/ui/ToolTips.scala
new file mode 100644
index 0000000000..37708d7548
--- /dev/null
+++ b/core/src/main/scala/org/apache/spark/ui/ToolTips.scala
@@ -0,0 +1,34 @@
+/*
+ * 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.ui
+
+private[spark] object ToolTips {
+  val SCHEDULER_DELAY =
+    """Scheduler delay includes time to ship the task from the scheduler to
+       the executor, and time the time to send a message from the executor to the scheduler stating
+       that the task has completed. When the scheduler becomes overloaded, task completion messages
+       become queued up, and scheduler delay increases."""
+
+  val INPUT = "Bytes read from Hadoop or from Spark storage."
+
+  val SHUFFLE_WRITE = "Bytes written to disk in order to be read by a shuffle in a future stage."
+
+  val SHUFFLE_READ =
+    """Bytes read from remote executors. Typically less than shuffle write bytes
+       because this does not include shuffle data read locally."""
+}
diff --git a/core/src/main/scala/org/apache/spark/ui/UIUtils.scala b/core/src/main/scala/org/apache/spark/ui/UIUtils.scala
index 1b104253d5..9cb50d9b83 100644
--- a/core/src/main/scala/org/apache/spark/ui/UIUtils.scala
+++ b/core/src/main/scala/org/apache/spark/ui/UIUtils.scala
@@ -25,6 +25,7 @@ import org.apache.spark.Logging
 
 /** Utility functions for generating XML pages with spark content. */
 private[spark] object UIUtils extends Logging {
+  val TABLE_CLASS = "table table-bordered table-striped table-condensed sortable"
 
   // SimpleDateFormat is not thread-safe. Don't expose it to avoid improper use.
   private val dateFormat = new ThreadLocal[SimpleDateFormat]() {
@@ -139,6 +140,18 @@ private[spark] object UIUtils extends Logging {
 
   def prependBaseUri(basePath: String = "", resource: String = "") = uiRoot + basePath + resource
 
+  val commonHeaderNodes = {
+    <meta http-equiv="Content-type" content="text/html; charset=utf-8" />
+    <link rel="stylesheet" href={prependBaseUri("/static/bootstrap.min.css")}
+          type="text/css" />
+    <link rel="stylesheet" href={prependBaseUri("/static/webui.css")}
+          type="text/css" />
+    <script src={prependBaseUri("/static/sorttable.js")} ></script>
+    <script src={prependBaseUri("/static/jquery-1.11.1.min.js")}></script>
+    <script src={prependBaseUri("/static/bootstrap-tooltip.js")}></script>
+    <script src={prependBaseUri("/static/initialize-tooltips.js")}></script>
+  }
+
   /** Returns a spark page with correctly formatted headers */
   def headerSparkPage(
       content: => Seq[Node],
@@ -157,12 +170,7 @@ private[spark] object UIUtils extends Logging {
 
     <html>
       <head>
-        <meta http-equiv="Content-type" content="text/html; charset=utf-8" />
-        <link rel="stylesheet" href={prependBaseUri("/static/bootstrap.min.css")}
-              type="text/css" />
-        <link rel="stylesheet" href={prependBaseUri("/static/webui.css")}
-              type="text/css" />
-        <script src={prependBaseUri("/static/sorttable.js")} ></script>
+        {commonHeaderNodes}
         <title>{appName} - {title}</title>
       </head>
       <body>
@@ -193,11 +201,7 @@ private[spark] object UIUtils extends Logging {
   def basicSparkPage(content: => Seq[Node], title: String): Seq[Node] = {
     <html>
       <head>
-        <meta http-equiv="Content-type" content="text/html; charset=utf-8" />
-        <link rel="stylesheet" href={prependBaseUri("/static/bootstrap.min.css")}
-              type="text/css" />
-        <link rel="stylesheet" href={prependBaseUri("/static/webui.css")}  type="text/css" />
-        <script src={prependBaseUri("/static/sorttable.js")} ></script>
+        {commonHeaderNodes}
         <title>{title}</title>
       </head>
       <body>
@@ -224,9 +228,9 @@ private[spark] object UIUtils extends Logging {
       data: Seq[T],
       fixedWidth: Boolean = false): Seq[Node] = {
 
-    var tableClass = "table table-bordered table-striped table-condensed sortable"
+    var listingTableClass = TABLE_CLASS
     if (fixedWidth) {
-      tableClass += " table-fixed"
+      listingTableClass += " table-fixed"
     }
     val colWidth = 100.toDouble / headers.size
     val colWidthAttr = if (fixedWidth) colWidth + "%" else ""
@@ -246,7 +250,7 @@ private[spark] object UIUtils extends Logging {
         }
       }
     }
-    <table class={tableClass}>
+    <table class={listingTableClass}>
       <thead>{headerRow}</thead>
       <tbody>
         {data.map(r => generateDataRow(r))}
diff --git a/core/src/main/scala/org/apache/spark/ui/exec/ExecutorsPage.scala b/core/src/main/scala/org/apache/spark/ui/exec/ExecutorsPage.scala
index 95b4a4e91d..b358c855e1 100644
--- a/core/src/main/scala/org/apache/spark/ui/exec/ExecutorsPage.scala
+++ b/core/src/main/scala/org/apache/spark/ui/exec/ExecutorsPage.scala
@@ -22,9 +22,26 @@ import javax.servlet.http.HttpServletRequest
 import scala.xml.Node
 
 import org.apache.spark.storage.StorageLevel
-import org.apache.spark.ui.{WebUIPage, UIUtils}
+import org.apache.spark.ui.{ToolTips, UIUtils, WebUIPage}
 import org.apache.spark.util.Utils
 
+/** Summary information about an executor to display in the UI. */
+private case class ExecutorSummaryInfo(
+    id: String,
+    hostPort: String,
+    rddBlocks: Int,
+    memoryUsed: Long,
+    diskUsed: Long,
+    activeTasks: Int,
+    failedTasks: Int,
+    completedTasks: Int,
+    totalTasks: Int,
+    totalDuration: Long,
+    totalInputBytes: Long,
+    totalShuffleRead: Long,
+    totalShuffleWrite: Long,
+    maxMemory: Long)
+
 private[ui] class ExecutorsPage(parent: ExecutorsTab) extends WebUIPage("") {
   private val appName = parent.appName
   private val basePath = parent.basePath
@@ -36,8 +53,36 @@ private[ui] class ExecutorsPage(parent: ExecutorsTab) extends WebUIPage("") {
     val memUsed = storageStatusList.map(_.memUsed).fold(0L)(_ + _)
     val diskSpaceUsed = storageStatusList.flatMap(_.blocks.values.map(_.diskSize)).fold(0L)(_ + _)
     val execInfo = for (statusId <- 0 until storageStatusList.size) yield getExecInfo(statusId)
-    val execInfoSorted = execInfo.sortBy(_.getOrElse("Executor ID", ""))
-    val execTable = UIUtils.listingTable(execHeader, execRow, execInfoSorted)
+    val execInfoSorted = execInfo.sortBy(_.id)
+
+    val execTable =
+      <table class={UIUtils.TABLE_CLASS}>
+        <thead>
+          <th>Executor ID</th>
+          <th>Address</th>
+          <th>RDD Blocks</th>
+          <th>Memory Used</th>
+          <th>Disk Used</th>
+          <th>Active Tasks</th>
+          <th>Failed Tasks</th>
+          <th>Complete Tasks</th>
+          <th>Total Tasks</th>
+          <th>Task Time</th>
+          <th><span data-toggle="tooltip" title={ToolTips.INPUT}>Input</span></th>
+          <th><span data-toggle="tooltip" title={ToolTips.SHUFFLE_READ}>Shuffle Read</span></th>
+          <th>
+            <!-- Place the shuffle write tooltip on the left (rather than the default position
+              of on top) because the shuffle write column is the last column on the right side and
+              the tooltip is wider than the column, so it doesn't fit on top. -->
+            <span data-toggle="tooltip" data-placement="left" title={ToolTips.SHUFFLE_WRITE}>
+              Shuffle Write
+            </span>
+          </th>
+        </thead>
+        <tbody>
+          {execInfoSorted.map(execRow(_))}
+        </tbody>
+      </table>
 
     val content =
       <div class="row-fluid">
@@ -60,53 +105,43 @@ private[ui] class ExecutorsPage(parent: ExecutorsTab) extends WebUIPage("") {
       parent.headerTabs, parent)
   }
 
-  /** Header fields for the executors table */
-  private def execHeader = Seq(
-    "Executor ID",
-    "Address",
-    "RDD Blocks",
-    "Memory Used",
-    "Disk Used",
-    "Active Tasks",
-    "Failed Tasks",
-    "Complete Tasks",
-    "Total Tasks",
-    "Task Time",
-    "Input Bytes",
-    "Shuffle Read",
-    "Shuffle Write")
-
   /** Render an HTML row representing an executor */
-  private def execRow(values: Map[String, String]): Seq[Node] = {
-    val maximumMemory = values("Maximum Memory")
-    val memoryUsed = values("Memory Used")
-    val diskUsed = values("Disk Used")
-    // scalastyle:off
+  private def execRow(info: ExecutorSummaryInfo): Seq[Node] = {
+    val maximumMemory = info.maxMemory
+    val memoryUsed = info.memoryUsed
+    val diskUsed = info.diskUsed
     <tr>
-      <td>{values("Executor ID")}</td>
-      <td>{values("Address")}</td>
-      <td>{values("RDD Blocks")}</td>
-      <td sorttable_customkey={memoryUsed}>
-        {Utils.bytesToString(memoryUsed.toLong)} /
-        {Utils.bytesToString(maximumMemory.toLong)}
+      <td>{info.id}</td>
+      <td>{info.hostPort}</td>
+      <td>{info.rddBlocks}</td>
+      <td sorttable_customkey={memoryUsed.toString}>
+        {Utils.bytesToString(memoryUsed)} /
+        {Utils.bytesToString(maximumMemory)}
+      </td>
+      <td sorttable_customkey={diskUsed.toString}>
+        {Utils.bytesToString(diskUsed)}
+      </td>
+      <td>{info.activeTasks}</td>
+      <td>{info.failedTasks}</td>
+      <td>{info.completedTasks}</td>
+      <td>{info.totalTasks}</td>
+      <td sorttable_customkey={info.totalDuration.toString}>
+        {Utils.msDurationToString(info.totalDuration)}
       </td>
-      <td sorttable_customkey={diskUsed}>
-        {Utils.bytesToString(diskUsed.toLong)}
+      <td sorttable_customkey={info.totalInputBytes.toString}>
+        {Utils.bytesToString(info.totalInputBytes)}
+      </td>
+      <td sorttable_customkey={info.totalShuffleRead.toString}>
+        {Utils.bytesToString(info.totalShuffleRead)}
+      </td>
+      <td sorttable_customkey={info.totalShuffleWrite.toString}>
+        {Utils.bytesToString(info.totalShuffleWrite)}
       </td>
-      <td>{values("Active Tasks")}</td>
-      <td>{values("Failed Tasks")}</td>
-      <td>{values("Complete Tasks")}</td>
-      <td>{values("Total Tasks")}</td>
-      <td sorttable_customkey={values("Task Time")}>{Utils.msDurationToString(values("Task Time").toLong)}</td>
-      <td sorttable_customkey={values("Input Bytes")}>{Utils.bytesToString(values("Input Bytes").toLong)}</td>
-      <td sorttable_customkey={values("Shuffle Read")}>{Utils.bytesToString(values("Shuffle Read").toLong)}</td>
-      <td sorttable_customkey={values("Shuffle Write")} >{Utils.bytesToString(values("Shuffle Write").toLong)}</td>
     </tr>
-    // scalastyle:on
   }
 
   /** Represent an executor's info as a map given a storage status index */
-  private def getExecInfo(statusId: Int): Map[String, String] = {
+  private def getExecInfo(statusId: Int): ExecutorSummaryInfo = {
     val status = listener.storageStatusList(statusId)
     val execId = status.blockManagerId.executorId
     val hostPort = status.blockManagerId.hostPort
@@ -118,15 +153,12 @@ private[ui] class ExecutorsPage(parent: ExecutorsTab) extends WebUIPage("") {
     val failedTasks = listener.executorToTasksFailed.getOrElse(execId, 0)
     val completedTasks = listener.executorToTasksComplete.getOrElse(execId, 0)
     val totalTasks = activeTasks + failedTasks + completedTasks
-    val totalDuration = listener.executorToDuration.getOrElse(execId, 0)
-    val totalInputBytes = listener.executorToInputBytes.getOrElse(execId, 0)
-    val totalShuffleRead = listener.executorToShuffleRead.getOrElse(execId, 0)
-    val totalShuffleWrite = listener.executorToShuffleWrite.getOrElse(execId, 0)
+    val totalDuration = listener.executorToDuration.getOrElse(execId, 0L)
+    val totalInputBytes = listener.executorToInputBytes.getOrElse(execId, 0L)
+    val totalShuffleRead = listener.executorToShuffleRead.getOrElse(execId, 0L)
+    val totalShuffleWrite = listener.executorToShuffleWrite.getOrElse(execId, 0L)
 
-    // Also include fields not in the header
-    val execFields = execHeader ++ Seq("Maximum Memory")
-
-    val execValues = Seq(
+    new ExecutorSummaryInfo(
       execId,
       hostPort,
       rddBlocks,
@@ -141,8 +173,6 @@ private[ui] class ExecutorsPage(parent: ExecutorsTab) extends WebUIPage("") {
       totalShuffleRead,
       totalShuffleWrite,
       maxMem
-    ).map(_.toString)
-
-    execFields.zip(execValues).toMap
+    )
   }
 }
diff --git a/core/src/main/scala/org/apache/spark/ui/jobs/ExecutorTable.scala b/core/src/main/scala/org/apache/spark/ui/jobs/ExecutorTable.scala
index 2a34a9af92..52020954ea 100644
--- a/core/src/main/scala/org/apache/spark/ui/jobs/ExecutorTable.scala
+++ b/core/src/main/scala/org/apache/spark/ui/jobs/ExecutorTable.scala
@@ -20,7 +20,7 @@ package org.apache.spark.ui.jobs
 import scala.collection.mutable
 import scala.xml.Node
 
-import org.apache.spark.ui.UIUtils
+import org.apache.spark.ui.{ToolTips, UIUtils}
 import org.apache.spark.util.Utils
 
 /** Page showing executor summary */
@@ -35,7 +35,7 @@ private[ui] class ExecutorTable(stageId: Int, parent: JobProgressTab) {
 
   /** Special table which merges two header cells. */
   private def executorTable[T](): Seq[Node] = {
-    <table class="table table-bordered table-striped table-condensed sortable">
+    <table class={UIUtils.TABLE_CLASS}>
       <thead>
         <th>Executor ID</th>
         <th>Address</th>
@@ -43,9 +43,9 @@ private[ui] class ExecutorTable(stageId: Int, parent: JobProgressTab) {
         <th>Total Tasks</th>
         <th>Failed Tasks</th>
         <th>Succeeded Tasks</th>
-        <th>Input Bytes</th>
-        <th>Shuffle Read</th>
-        <th>Shuffle Write</th>
+        <th><span data-toggle="tooltip" title={ToolTips.INPUT}>Input</span></th>
+        <th><span data-toggle="tooltip" title={ToolTips.SHUFFLE_READ}>Shuffle Read</span></th>
+        <th><span data-toggle="tooltip" title={ToolTips.SHUFFLE_WRITE}>Shuffle Write</span></th>
         <th>Shuffle Spill (Memory)</th>
         <th>Shuffle Spill (Disk)</th>
       </thead>
diff --git a/core/src/main/scala/org/apache/spark/ui/jobs/StagePage.scala b/core/src/main/scala/org/apache/spark/ui/jobs/StagePage.scala
index afb8ed754f..8c3821bd7c 100644
--- a/core/src/main/scala/org/apache/spark/ui/jobs/StagePage.scala
+++ b/core/src/main/scala/org/apache/spark/ui/jobs/StagePage.scala
@@ -22,7 +22,7 @@ import javax.servlet.http.HttpServletRequest
 
 import scala.xml.Node
 
-import org.apache.spark.ui.{WebUIPage, UIUtils}
+import org.apache.spark.ui.{ToolTips, WebUIPage, UIUtils}
 import org.apache.spark.util.{Utils, Distribution}
 
 /** Page showing statistics and task list for a given stage */
@@ -127,14 +127,14 @@ private[ui] class StagePage(parent: JobProgressTab) extends WebUIPage("stage") {
             metrics.get.resultSerializationTime.toDouble
           }
           val serializationQuantiles =
-            "Result serialization time" +: Distribution(serializationTimes).
-              get.getQuantiles().map(ms => UIUtils.formatDuration(ms.toLong))
+            <td>Result serialization time</td> +: Distribution(serializationTimes).
+              get.getQuantiles().map(ms => <td>{UIUtils.formatDuration(ms.toLong)}</td>)
 
           val serviceTimes = validTasks.map { case TaskUIData(_, metrics, _) =>
             metrics.get.executorRunTime.toDouble
           }
-          val serviceQuantiles = "Duration" +: Distribution(serviceTimes).get.getQuantiles()
-            .map(ms => UIUtils.formatDuration(ms.toLong))
+          val serviceQuantiles = <td>Duration</td> +: Distribution(serviceTimes).get.getQuantiles()
+            .map(ms => <td>{UIUtils.formatDuration(ms.toLong)}</td>)
 
           val gettingResultTimes = validTasks.map { case TaskUIData(info, _, _) =>
             if (info.gettingResultTime > 0) {
@@ -143,9 +143,9 @@ private[ui] class StagePage(parent: JobProgressTab) extends WebUIPage("stage") {
               0.0
             }
           }
-          val gettingResultQuantiles = "Time spent fetching task results" +:
+          val gettingResultQuantiles = <td>Time spent fetching task results</td> +:
             Distribution(gettingResultTimes).get.getQuantiles().map { millis =>
-              UIUtils.formatDuration(millis.toLong)
+              <td>{UIUtils.formatDuration(millis.toLong)}</td>
             }
           // The scheduler delay includes the network delay to send the task to the worker
           // machine and to send back the result (but not the time to fetch the task result,
@@ -160,42 +160,45 @@ private[ui] class StagePage(parent: JobProgressTab) extends WebUIPage("stage") {
             }
             totalExecutionTime - metrics.get.executorRunTime
           }
-          val schedulerDelayQuantiles = "Scheduler delay" +:
+          val schedulerDelayTitle = <td><span data-toggle="tooltip"
+            title={ToolTips.SCHEDULER_DELAY} data-placement="right">Scheduler delay</span></td>
+          val schedulerDelayQuantiles = schedulerDelayTitle +:
             Distribution(schedulerDelays).get.getQuantiles().map { millis =>
-              UIUtils.formatDuration(millis.toLong)
+              <td>{UIUtils.formatDuration(millis.toLong)}</td>
             }
 
           def getQuantileCols(data: Seq[Double]) =
-            Distribution(data).get.getQuantiles().map(d => Utils.bytesToString(d.toLong))
+            Distribution(data).get.getQuantiles().map(d => <td>{Utils.bytesToString(d.toLong)}</td>)
 
           val inputSizes = validTasks.map { case TaskUIData(_, metrics, _) =>
             metrics.get.inputMetrics.map(_.bytesRead).getOrElse(0L).toDouble
           }
-          val inputQuantiles = "Input" +: getQuantileCols(inputSizes)
+          val inputQuantiles = <td>Input</td> +: getQuantileCols(inputSizes)
 
           val shuffleReadSizes = validTasks.map { case TaskUIData(_, metrics, _) =>
             metrics.get.shuffleReadMetrics.map(_.remoteBytesRead).getOrElse(0L).toDouble
           }
-          val shuffleReadQuantiles = "Shuffle Read (Remote)" +: getQuantileCols(shuffleReadSizes)
+          val shuffleReadQuantiles = <td>Shuffle Read (Remote)</td> +:
+            getQuantileCols(shuffleReadSizes)
 
           val shuffleWriteSizes = validTasks.map { case TaskUIData(_, metrics, _) =>
             metrics.get.shuffleWriteMetrics.map(_.shuffleBytesWritten).getOrElse(0L).toDouble
           }
-          val shuffleWriteQuantiles = "Shuffle Write" +: getQuantileCols(shuffleWriteSizes)
+          val shuffleWriteQuantiles = <td>Shuffle Write</td> +: getQuantileCols(shuffleWriteSizes)
 
           val memoryBytesSpilledSizes = validTasks.map { case TaskUIData(_, metrics, _) =>
             metrics.get.memoryBytesSpilled.toDouble
           }
-          val memoryBytesSpilledQuantiles = "Shuffle spill (memory)" +:
+          val memoryBytesSpilledQuantiles = <td>Shuffle spill (memory)</td> +:
             getQuantileCols(memoryBytesSpilledSizes)
 
           val diskBytesSpilledSizes = validTasks.map { case TaskUIData(_, metrics, _) =>
             metrics.get.diskBytesSpilled.toDouble
           }
-          val diskBytesSpilledQuantiles = "Shuffle spill (disk)" +:
+          val diskBytesSpilledQuantiles = <td>Shuffle spill (disk)</td> +:
             getQuantileCols(diskBytesSpilledSizes)
 
-          val listings: Seq[Seq[String]] = Seq(
+          val listings: Seq[Seq[Node]] = Seq(
             serializationQuantiles,
             serviceQuantiles,
             gettingResultQuantiles,
@@ -208,7 +211,7 @@ private[ui] class StagePage(parent: JobProgressTab) extends WebUIPage("stage") {
 
           val quantileHeaders = Seq("Metric", "Min", "25th percentile",
             "Median", "75th percentile", "Max")
-          def quantileRow(data: Seq[String]): Seq[Node] = <tr> {data.map(d => <td>{d}</td>)} </tr>
+          def quantileRow(data: Seq[Node]): Seq[Node] = <tr>{data}</tr>
           Some(UIUtils.listingTable(quantileHeaders, quantileRow, listings, fixedWidth = true))
         }
       val executorTable = new ExecutorTable(stageId, parent)
diff --git a/core/src/main/scala/org/apache/spark/ui/jobs/StageTable.scala b/core/src/main/scala/org/apache/spark/ui/jobs/StageTable.scala
index a9ac6d5bee..4013c6f499 100644
--- a/core/src/main/scala/org/apache/spark/ui/jobs/StageTable.scala
+++ b/core/src/main/scala/org/apache/spark/ui/jobs/StageTable.scala
@@ -23,7 +23,7 @@ import scala.collection.mutable.HashMap
 import scala.xml.Node
 
 import org.apache.spark.scheduler.{StageInfo, TaskInfo}
-import org.apache.spark.ui.UIUtils
+import org.apache.spark.ui.{ToolTips, UIUtils}
 import org.apache.spark.util.Utils
 
 /** Page showing list of all ongoing and recently finished stages */
@@ -43,9 +43,16 @@ private[ui] class StageTableBase(
     <th>Submitted</th>
     <th>Duration</th>
     <th>Tasks: Succeeded/Total</th>
-    <th>Input</th>
-    <th>Shuffle Read</th>
-    <th>Shuffle Write</th>
+    <th><span data-toggle="tooltip" title={ToolTips.INPUT}>Input</span></th>
+    <th><span data-toggle="tooltip" title={ToolTips.SHUFFLE_READ}>Shuffle Read</span></th>
+    <th>
+      <!-- Place the shuffle write tooltip on the left (rather than the default position
+        of on top) because the shuffle write column is the last column on the right side and
+        the tooltip is wider than the column, so it doesn't fit on top. -->
+      <span data-toggle="tooltip" data-placement="left" title={ToolTips.SHUFFLE_WRITE}>
+        Shuffle Write
+      </span>
+    </th>
   }
 
   def toNodeSeq: Seq[Node] = {