diff --git a/.rat-excludes b/.rat-excludes
index 796c32a80896c..372bc2587ccc3 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 0000000000000..2934181c1006a
--- /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 () {
+    $.fn.tooltip = old
+    return this
+  }
+
+}(window.jQuery);
+
diff --git a/core/src/main/resources/org/apache/spark/ui/static/initialize-tooltips.js b/core/src/main/resources/org/apache/spark/ui/static/initialize-tooltips.js
new file mode 100644
index 0000000000000..70f355dfb49cb
--- /dev/null
+++ b/core/src/main/resources/org/apache/spark/ui/static/initialize-tooltips.js
@@ -0,0 +1,21 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+$(document).ready(function(){
+   $("[data-toggle=tooltip]").tooltip({container: 'body'});
+});
+
diff --git a/core/src/main/resources/org/apache/spark/ui/static/jquery-1.11.1.min.js b/core/src/main/resources/org/apache/spark/ui/static/jquery-1.11.1.min.js
new file mode 100644
index 0000000000000..ab28a24729b32
--- /dev/null
+++ b/core/src/main/resources/org/apache/spark/ui/static/jquery-1.11.1.min.js
@@ -0,0 +1,4 @@
+/*! jQuery v1.11.1 | (c) 2005, 2014 jQuery Foundation, Inc. | jquery.org/license */
+!function(a,b){"object"==typeof module&&"object"==typeof module.exports?module.exports=a.document?b(a,!0):function(a){if(!a.document)throw new Error("jQuery requires a window with a document");return b(a)}:b(a)}("undefined"!=typeof window?window:this,function(a,b){var c=[],d=c.slice,e=c.concat,f=c.push,g=c.indexOf,h={},i=h.toString,j=h.hasOwnProperty,k={},l="1.11.1",m=function(a,b){return new m.fn.init(a,b)},n=/^[\s\uFEFF\xA0]+|[\s\uFEFF\xA0]+$/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 11fd956bfbe66..7448af87fcf38 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 0000000000000..37708d75489c8
--- /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 1b104253d545d..9cb50d9b83dda 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 9625337ae21a5..01b3c604ef5f2 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
@@ -120,15 +155,12 @@ 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,
@@ -143,8 +175,6 @@ 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 2a34a9af925d6..52020954ea57c 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 afb8ed754ff8b..8c3821bd7c3eb 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 a9ac6d5bee9c9..4013c6f49936c 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] = {