Github user tnachen commented on the pull request:

    https://github.com/apache/spark/pull/3861#issuecomment-74216800
  
    @andrewor14 Mesos slave doesn't have the concept of Auxilary service as 
YARN, that launches a service as part of the Slave. It requires a task to be 
running to launch anything.
    
    Therefore to have a long running service that lives longer than the task 
lifetime, I went the route to create a custom Mesos executor that launches the 
Coarse grained spark executor, and continue to run when the spark executor 
finishes. The custom executor also launches the external shuffle service.
    
    I agree I didn't really like the diverging path, but I felt like the 
original method is much simpler as it directly launches the coarse grain 
executor, and don't want to increase the complexity by making it also have to 
launch this custom executor.


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