srowen commented on a change in pull request #26467: [SPARK-29477]Improve 
tooltip for Streaming tab
URL: https://github.com/apache/spark/pull/26467#discussion_r349800287
 
 

 ##########
 File path: 
streaming/src/main/scala/org/apache/spark/streaming/ui/BatchPage.scala
 ##########
 @@ -37,10 +37,14 @@ private[ui] class BatchPage(parent: StreamingTab) extends 
WebUIPage("batch") {
   private def columns: Seq[Node] = {
     <th>Output Op Id</th>
       <th>Description</th>
-      <th>Output Op Duration</th>
+      <th>Output Op Duration {SparkUIUtils.tooltip("Time taken for all the 
jobs of this batch to" +
 
 Review comment:
   I'm not sure users would know what those delays are. It's hard to describe 
it succinctly. I think the key point is that it is "Time from job submission 
until all are completed" This clarifies it isn't just since the time they 
started processing.
   
   But, that kind of sounds like what Job Duration is. How is Output Op 
duration different? the description sounds the same.

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