Github user Ngone51 commented on a diff in the pull request: https://github.com/apache/spark/pull/22001#discussion_r209658945 --- Diff: core/src/main/scala/org/apache/spark/scheduler/DAGScheduler.scala --- @@ -929,6 +955,28 @@ class DAGScheduler( // HadoopRDD whose underlying HDFS files have been deleted. finalStage = createResultStage(finalRDD, func, partitions, jobId, callSite) } catch { + case e: Exception if e.getMessage == + DAGScheduler.ERROR_MESSAGE_BARRIER_REQUIRE_MORE_SLOTS_THAN_CURRENT_TOTAL_NUMBER => + logWarning("The job requires to run a barrier stage that requires more slots than the " + + "total number of slots in the cluster currently.") + jobIdToNumTasksCheckFailures.putIfAbsent(jobId, 0) + val numCheckFailures = jobIdToNumTasksCheckFailures.get(jobId) + 1 --- End diff -- @kiszk IIUC, there's exactly only one thread in `eventLoop`, so, the scenario mentioned above will not happen. And I even feel it is no need to use `ConcurrentHashMap` for `jobIdToNumTasksCheckFailures` at all. @jiangxb1987
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