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

    https://github.com/apache/spark/pull/22001#discussion_r209460309
  
    --- Diff: core/src/main/scala/org/apache/spark/scheduler/DAGScheduler.scala 
---
    @@ -929,11 +963,38 @@ class DAGScheduler(
           // HadoopRDD whose underlying HDFS files have been deleted.
           finalStage = createResultStage(finalRDD, func, partitions, jobId, 
callSite)
         } catch {
    +      case e: Exception if e.getMessage.contains(
    +          
DAGScheduler.ERROR_MESSAGE_BARRIER_REQUIRE_MORE_SLOTS_THAN_CURRENT_TOTAL_NUMBER)
 =>
    +        logWarning(s"The job $jobId requires to run a barrier stage that 
requires more slots " +
    +          "than the total number of slots in the cluster currently.")
    +        jobIdToNumTasksCheckFailures.compute(jobId, new BiFunction[Int, 
Int, Int] {
    +          override def apply(key: Int, value: Int): Int = value + 1
    +        })
    +        val numCheckFailures = jobIdToNumTasksCheckFailures.get(jobId)
    --- End diff --
    
    minor: this is the return value from `compute`. we don't need `get`.


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