Github user vanzin commented on the issue:

    https://github.com/apache/spark/pull/21558
  
    Actually I didn't mean speculation but something like this:
    
    ```
    sc.parallelize(1 to 10).foreach { i => if 
(TaskContext.get().attemptNumber() == 0) throw new Exception("Fail") else 
println(i) }
    ```
    
    Anyway I ran that and the behavior is the same (different attempt = 
different task ID) so it's all good.


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