Github user witgo commented on the issue:

    https://github.com/apache/spark/pull/15505
  
    @kayousterhout 
    
    Here are my thoughts:
    move the serialization out of the `TaskSetManager.resourceOffer` method. 
Split resourceOffer and serialization process, So that we can make the 
serialization task operation multi-threaded execution.
    See eb58988948341340432cf9cdde0d11842930ec57 .  It can can reduce the 
scheduling time by three times



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