Github user vanzin commented on a diff in the pull request:

    https://github.com/apache/spark/pull/22177#discussion_r212134537
  
    --- Diff: core/src/main/scala/org/apache/spark/ui/jobs/JobPage.scala ---
    @@ -337,7 +337,9 @@ private[ui] class JobPage(parent: JobsTab, store: 
AppStatusStore) extends WebUIP
           store.executorList(false), appStartTime)
     
         val operationGraphContent = 
store.asOption(store.operationGraphForJob(jobId)) match {
    -      case Some(operationGraph) => UIUtils.showDagVizForJob(jobId, 
operationGraph)
    +      case Some(operationGraph) => UIUtils.showDagVizForJob(jobId, 
operationGraph.sortWith(
    +        
_.rootCluster.id.replaceAll(RDDOperationGraph.STAGE_CLUSTER_PREFIX, "").toInt
    --- End diff --
    
    +1. `replaceAll` also seems like the wrong API to use, `substring` seems 
more correct.


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