diff --git a/core/src/main/scala/org/apache/spark/status/api/v1/api.scala b/core/src/main/scala/org/apache/spark/status/api/v1/api.scala
index fe372116f1b69..3adf5b1109af4 100644
--- a/core/src/main/scala/org/apache/spark/status/api/v1/api.scala
+++ b/core/src/main/scala/org/apache/spark/status/api/v1/api.scala
@@ -55,11 +55,13 @@ class ExecutorSummary private[spark](
     val rddBlocks: Int,
     val memoryUsed: Long,
     val diskUsed: Long,
+    val maxTasks: Int,
     val activeTasks: Int,
     val failedTasks: Int,
     val completedTasks: Int,
     val totalTasks: Int,
     val totalDuration: Long,
+    val totalGCTime: Long,
     val totalInputBytes: Long,
     val totalShuffleRead: Long,
     val totalShuffleWrite: Long,
diff --git a/core/src/main/scala/org/apache/spark/ui/SparkUI.scala b/core/src/main/scala/org/apache/spark/ui/SparkUI.scala
index e319937702f23..873288ed0ac09 100644
--- a/core/src/main/scala/org/apache/spark/ui/SparkUI.scala
+++ b/core/src/main/scala/org/apache/spark/ui/SparkUI.scala
@@ -194,7 +194,7 @@ private[spark] object SparkUI {
 
     val environmentListener = new EnvironmentListener
     val storageStatusListener = new StorageStatusListener
-    val executorsListener = new ExecutorsListener(storageStatusListener)
+    val executorsListener = new ExecutorsListener(storageStatusListener, conf)
     val storageListener = new StorageListener(storageStatusListener)
     val operationGraphListener = new RDDOperationGraphListener(conf)
 
diff --git a/core/src/main/scala/org/apache/spark/ui/ToolTips.scala b/core/src/main/scala/org/apache/spark/ui/ToolTips.scala
index cb122eaed83d1..2d2d80be4aabe 100644
--- a/core/src/main/scala/org/apache/spark/ui/ToolTips.scala
+++ b/core/src/main/scala/org/apache/spark/ui/ToolTips.scala
@@ -87,4 +87,7 @@ private[spark] object ToolTips {
        multiple operations (e.g. two map() functions) if they can be pipelined. Some operations
        also create multiple RDDs internally. Cached RDDs are shown in green.
     """
+
+  val TASK_TIME =
+  "Shaded red when garbage collection (GC) time is over 10% of task time"
 }
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 440dfa2679563..e36b96b3e6978 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
@@ -50,6 +50,8 @@ private[ui] class ExecutorsPage(
     threadDumpEnabled: Boolean)
   extends WebUIPage("") {
   private val listener = parent.listener
+  // When GCTimePercent is edited change ToolTips.TASK_TIME to match
+  private val GCTimePercent = 0.1
 
   def render(request: HttpServletRequest): Seq[Node] = {
     val (storageStatusList, execInfo) = listener.synchronized {
@@ -77,7 +79,7 @@ private[ui] class ExecutorsPage(
           <th>Failed Tasks</th>
           <th>Complete Tasks</th>
           <th>Total Tasks</th>
-          <th>Task Time</th>
+          <th data-toggle="tooltip" title={ToolTips.TASK_TIME}>Task Time (GC 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>
@@ -129,13 +131,8 @@ private[ui] class ExecutorsPage(
       <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>
+      {taskData(info.maxTasks, info.activeTasks, info.failedTasks, info.completedTasks,
+      info.totalTasks, info.totalDuration, info.totalGCTime)}
       <td sorttable_customkey={info.totalInputBytes.toString}>
         {Utils.bytesToString(info.totalInputBytes)}
       </td>
@@ -177,7 +174,6 @@ private[ui] class ExecutorsPage(
     val maximumMemory = execInfo.map(_.maxMemory).sum
     val memoryUsed = execInfo.map(_.memoryUsed).sum
     val diskUsed = execInfo.map(_.diskUsed).sum
-    val totalDuration = execInfo.map(_.totalDuration).sum
     val totalInputBytes = execInfo.map(_.totalInputBytes).sum
     val totalShuffleRead = execInfo.map(_.totalShuffleRead).sum
     val totalShuffleWrite = execInfo.map(_.totalShuffleWrite).sum
@@ -192,13 +188,13 @@ private[ui] class ExecutorsPage(
         <td sorttable_customkey={diskUsed.toString}>
           {Utils.bytesToString(diskUsed)}
         </td>
-        <td>{execInfo.map(_.activeTasks).sum}</td>
-        <td>{execInfo.map(_.failedTasks).sum}</td>
-        <td>{execInfo.map(_.completedTasks).sum}</td>
-        <td>{execInfo.map(_.totalTasks).sum}</td>
-        <td sorttable_customkey={totalDuration.toString}>
-          {Utils.msDurationToString(totalDuration)}
-        </td>
+        {taskData(execInfo.map(_.maxTasks).sum,
+        execInfo.map(_.activeTasks).sum,
+        execInfo.map(_.failedTasks).sum,
+        execInfo.map(_.completedTasks).sum,
+        execInfo.map(_.totalTasks).sum,
+        execInfo.map(_.totalDuration).sum,
+        execInfo.map(_.totalGCTime).sum)}
         <td sorttable_customkey={totalInputBytes.toString}>
           {Utils.bytesToString(totalInputBytes)}
         </td>
@@ -219,7 +215,7 @@ private[ui] class ExecutorsPage(
         <th>Failed Tasks</th>
         <th>Complete Tasks</th>
         <th>Total Tasks</th>
-        <th>Task Time</th>
+        <th data-toggle="tooltip" title={ToolTips.TASK_TIME}>Task Time (GC 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>
@@ -233,6 +229,70 @@ private[ui] class ExecutorsPage(
       </tbody>
     </table>
   }
+
+  private def taskData(
+    maxTasks: Int,
+    activeTasks: Int,
+    failedTasks: Int,
+    completedTasks: Int,
+    totalTasks: Int,
+    totalDuration: Long,
+    totalGCTime: Long):
+  Seq[Node] = {
+    // Determine Color Opacity from 0.5-1
+    // activeTasks range from 0 to maxTasks
+    val activeTasksAlpha =
+      if (maxTasks > 0) {
+        (activeTasks.toDouble / maxTasks) * 0.5 + 0.5
+      } else {
+        1
+      }
+    // failedTasks range max at 10% failure, alpha max = 1
+    val failedTasksAlpha =
+      if (totalTasks > 0) {
+        math.min(10 * failedTasks.toDouble / totalTasks, 1) * 0.5 + 0.5
+      } else {
+        1
+      }
+    // totalDuration range from 0 to 50% GC time, alpha max = 1
+    val totalDurationAlpha =
+      if (totalDuration > 0) {
+        math.min(totalGCTime.toDouble / totalDuration + 0.5, 1)
+      } else {
+        1
+      }
+
+    val tableData =
+    <td style={
+      if (activeTasks > 0) {
+        "background:hsla(240, 100%, 50%, " + activeTasksAlpha + ");color:white"
+      } else {
+        ""
+      }
+      }>{activeTasks}</td>
+    <td style={
+      if (failedTasks > 0) {
+        "background:hsla(0, 100%, 50%, " + failedTasksAlpha + ");color:white"
+      } else {
+        ""
+      }
+      }>{failedTasks}</td>
+    <td>{completedTasks}</td>
+    <td>{totalTasks}</td>
+    <td sorttable_customkey={totalDuration.toString} style={
+      // Red if GC time over GCTimePercent of total time
+      if (totalGCTime > GCTimePercent * totalDuration) {
+        "background:hsla(0, 100%, 50%, " + totalDurationAlpha + ");color:white"
+      } else {
+        ""
+      }
+    }>
+      {Utils.msDurationToString(totalDuration)}
+      ({Utils.msDurationToString(totalGCTime)})
+    </td>;
+
+    tableData
+  }
 }
 
 private[spark] object ExecutorsPage {
@@ -245,11 +305,13 @@ private[spark] object ExecutorsPage {
     val memUsed = status.memUsed
     val maxMem = status.maxMem
     val diskUsed = status.diskUsed
+    val maxTasks = listener.executorToTasksMax.getOrElse(execId, 0)
     val activeTasks = listener.executorToTasksActive.getOrElse(execId, 0)
     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, 0L)
+    val totalGCTime = listener.executorToJvmGCTime.getOrElse(execId, 0L)
     val totalInputBytes = listener.executorToInputBytes.getOrElse(execId, 0L)
     val totalShuffleRead = listener.executorToShuffleRead.getOrElse(execId, 0L)
     val totalShuffleWrite = listener.executorToShuffleWrite.getOrElse(execId, 0L)
@@ -261,11 +323,13 @@ private[spark] object ExecutorsPage {
       rddBlocks,
       memUsed,
       diskUsed,
+      maxTasks,
       activeTasks,
       failedTasks,
       completedTasks,
       totalTasks,
       totalDuration,
+      totalGCTime,
       totalInputBytes,
       totalShuffleRead,
       totalShuffleWrite,
diff --git a/core/src/main/scala/org/apache/spark/ui/exec/ExecutorsTab.scala b/core/src/main/scala/org/apache/spark/ui/exec/ExecutorsTab.scala
index 2d955a66601ee..504793b8ad198 100644
--- a/core/src/main/scala/org/apache/spark/ui/exec/ExecutorsTab.scala
+++ b/core/src/main/scala/org/apache/spark/ui/exec/ExecutorsTab.scala
@@ -19,7 +19,7 @@ package org.apache.spark.ui.exec
 
 import scala.collection.mutable.HashMap
 
-import org.apache.spark.{ExceptionFailure, Resubmitted, SparkContext}
+import org.apache.spark.{ExceptionFailure, Resubmitted, SparkConf, SparkContext}
 import org.apache.spark.annotation.DeveloperApi
 import org.apache.spark.scheduler._
 import org.apache.spark.storage.{StorageStatus, StorageStatusListener}
@@ -43,11 +43,14 @@ private[ui] class ExecutorsTab(parent: SparkUI) extends SparkUITab(parent, "exec
  * A SparkListener that prepares information to be displayed on the ExecutorsTab
  */
 @DeveloperApi
-class ExecutorsListener(storageStatusListener: StorageStatusListener) extends SparkListener {
+class ExecutorsListener(storageStatusListener: StorageStatusListener, conf: SparkConf)
+    extends SparkListener {
+  val executorToTasksMax = HashMap[String, Int]()
   val executorToTasksActive = HashMap[String, Int]()
   val executorToTasksComplete = HashMap[String, Int]()
   val executorToTasksFailed = HashMap[String, Int]()
   val executorToDuration = HashMap[String, Long]()
+  val executorToJvmGCTime = HashMap[String, Long]()
   val executorToInputBytes = HashMap[String, Long]()
   val executorToInputRecords = HashMap[String, Long]()
   val executorToOutputBytes = HashMap[String, Long]()
@@ -62,6 +65,8 @@ class ExecutorsListener(storageStatusListener: StorageStatusListener) extends Sp
   override def onExecutorAdded(executorAdded: SparkListenerExecutorAdded): Unit = synchronized {
     val eid = executorAdded.executorId
     executorToLogUrls(eid) = executorAdded.executorInfo.logUrlMap
+    executorToTasksMax(eid) =
+      executorAdded.executorInfo.totalCores / conf.getInt("spark.task.cpus", 1)
     executorIdToData(eid) = ExecutorUIData(executorAdded.time)
   }
 
@@ -131,6 +136,7 @@ class ExecutorsListener(storageStatusListener: StorageStatusListener) extends Sp
           executorToShuffleWrite(eid) =
             executorToShuffleWrite.getOrElse(eid, 0L) + shuffleWrite.shuffleBytesWritten
         }
+        executorToJvmGCTime(eid) = executorToJvmGCTime.getOrElse(eid, 0L) + metrics.jvmGCTime
       }
     }
   }
diff --git a/core/src/test/resources/HistoryServerExpectations/executor_list_json_expectation.json b/core/src/test/resources/HistoryServerExpectations/executor_list_json_expectation.json
index cb622e147249e..94f8aeac55b5d 100644
--- a/core/src/test/resources/HistoryServerExpectations/executor_list_json_expectation.json
+++ b/core/src/test/resources/HistoryServerExpectations/executor_list_json_expectation.json
@@ -4,11 +4,13 @@
   "rddBlocks" : 8,
   "memoryUsed" : 28000128,
   "diskUsed" : 0,
+  "maxTasks" : 0,
   "activeTasks" : 0,
   "failedTasks" : 1,
   "completedTasks" : 31,
   "totalTasks" : 32,
   "totalDuration" : 8820,
+  "totalGCTime" : 352,
   "totalInputBytes" : 28000288,
   "totalShuffleRead" : 0,
   "totalShuffleWrite" : 13180,
diff --git a/project/MimaExcludes.scala b/project/MimaExcludes.scala
index ccd3c34bb5c8c..0feadd17ea762 100644
--- a/project/MimaExcludes.scala
+++ b/project/MimaExcludes.scala
@@ -125,6 +125,9 @@ object MimaExcludes {
         ProblemFilters.exclude[MissingClassProblem]("org.apache.spark.storage.ExternalBlockStore$"),
         ProblemFilters.exclude[MissingClassProblem]("org.apache.spark.storage.ExternalBlockManager"),
         ProblemFilters.exclude[MissingClassProblem]("org.apache.spark.storage.ExternalBlockStore")
+      ) ++ Seq(
+        // SPARK-12149 Added new fields to ExecutorSummary
+        ProblemFilters.exclude[MissingMethodProblem]("org.apache.spark.status.api.v1.ExecutorSummary.this")
       ) ++
       // SPARK-12665 Remove deprecated and unused classes
       Seq(
@@ -283,6 +286,9 @@ object MimaExcludes {
         // SPARK-3580 Add getNumPartitions method to JavaRDD
         ProblemFilters.exclude[MissingMethodProblem](
           "org.apache.spark.api.java.JavaRDDLike.getNumPartitions")
+      ) ++ Seq(
+        // SPARK-12149 Added new fields to ExecutorSummary
+        ProblemFilters.exclude[MissingMethodProblem]("org.apache.spark.status.api.v1.ExecutorSummary.this")
       ) ++
       // SPARK-11314: YARN backend moved to yarn sub-module and MiMA complains even though it's a
       // private class.