[SPARK-12739][STREAMING] Details of batch in Streaming tab uses two Duration columns

I have clearly prefix the two 'Duration' columns in 'Details of Batch' Streaming tab as 'Output Op Duration' and 'Job Duration'

Author: Mario Briggs <[email protected]>
Author: mariobriggs <[email protected]>

Closes #11022 from mariobriggs/spark-12739.

Author: mariobriggs

streaming/src/main/scala/org/apache/spark/streaming/ui/BatchPage.scala

@@ -37,10 +37,10 @@ private[ui] class BatchPage(parent: StreamingTab) extends WebUIPage("batch") {
   private def columns: Seq[Node] = {
     <th>Output Op Id</th>
       <th>Description</th>
-      <th>Duration</th>
+      <th>Output Op Duration</th>
       <th>Status</th>
       <th>Job Id</th>
-      <th>Duration</th>
+      <th>Job Duration</th>
       <th class="sorttable_nosort">Stages: Succeeded/Total</th>
       <th class="sorttable_nosort">Tasks (for all stages): Succeeded/Total</th>
       <th>Error</th>

streaming/src/test/scala/org/apache/spark/streaming/UISeleniumSuite.scala

@@ -143,8 +143,9 @@ class UISeleniumSuite
         summaryText should contain ("Total delay:")
 
         findAll(cssSelector("""#batch-job-table th""")).map(_.text).toSeq should be {
-          List("Output Op Id", "Description", "Duration", "Status", "Job Id", "Duration",
-            "Stages: Succeeded/Total", "Tasks (for all stages): Succeeded/Total", "Error")
+          List("Output Op Id", "Description", "Output Op Duration", "Status", "Job Id",
+            "Job Duration", "Stages: Succeeded/Total", "Tasks (for all stages): Succeeded/Total",
+            "Error")
         }
 
         // Check we have 2 output op ids