Github user IngoSchuster commented on the issue:

    https://github.com/apache/spark/pull/18499
  
    Can we pull that also into 2.1.1? The original code in JettyUtils to limit 
the number of selector threads is actually wrong.
    
    Instead of
    `  val numSelectors = math.max(1, math.min(8, 
Runtime.getRuntime().availableProcessors() / 2))`
    it should have been
    `  val numSelectors = math.min(1, math.max(8, 
Runtime.getRuntime().availableProcessors() / 2))`
    
    With this PR, a fix for the bug above is no longer needed.


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