[SPARK-2320] Reduce <pre> block font size.

core/src/main/resources/org/apache/spark/ui/static/webui.css

@@ -95,6 +95,10 @@ span.expand-details {
   float: right;
 }
 
+pre {
+  font-size: 0.8em;
+}
+
 .stage-details {
   max-height: 100px;
   overflow-y: auto;

core/src/main/scala/org/apache/spark/ui/jobs/UIData.scala

@@ -0,0 +1,59 @@
+/*
+ * 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.jobs
+
+import org.apache.spark.executor.TaskMetrics
+import org.apache.spark.scheduler.TaskInfo
+
+import scala.collection.mutable.HashMap
+
+private[jobs] object UIData {
+
+  class ExecutorSummary {
+    var taskTime : Long = 0
+    var failedTasks : Int = 0
+    var succeededTasks : Int = 0
+    var shuffleRead : Long = 0
+    var shuffleWrite : Long = 0
+    var memoryBytesSpilled : Long = 0
+    var diskBytesSpilled : Long = 0
+  }
+
+  class StageData {
+    var executorRunTime: Long = _
+    var shuffleReadBytes: Long = _
+    var shuffleWriteBytes: Long = _
+    var memoryBytesSpilled: Long = _
+    var diskBytesSpilled: Long = _
+
+    var numActiveTasks: Int = _
+    var numCompleteTasks: Int = _
+    var numFailedTasks: Int = _
+
+    var schedulingPool: String = _
+    var description: String = _
+
+    var taskData = new HashMap[Long, TaskUIData]
+    var executorSummary = new HashMap[String, ExecutorSummary]
+  }
+
+  case class TaskUIData(
+      taskInfo: TaskInfo,
+      taskMetrics: Option[TaskMetrics] = None,
+      errorMessage: Option[String] = None)
+}