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

    https://github.com/apache/spark/pull/8269#discussion_r37840352
  
    --- Diff: core/src/main/scala/org/apache/spark/scheduler/DAGScheduler.scala 
---
    @@ -732,7 +732,8 @@ class DAGScheduler(
             job.jobId, callSite.shortForm, partitions.length))
           logInfo("Final stage: " + finalStage + "(" + finalStage.name + ")")
           logInfo("Parents of final stage: " + finalStage.parents)
    -      logInfo("Missing parents: " + getMissingParentStages(finalStage))
    +      val missingStages = getMissingParentStages(finalStage)
    +      logInfo("Missing parents: " + missingStages)
    --- End diff --
    
    Super minor but should this use string interpolation? as a general 
principle for speed and conciseness, though it won't matter here.


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