Github user IgorBerman commented on the issue:

    https://github.com/apache/spark/pull/17619
  
    +1 here, we are running spark core jobs but with long running driver on 
Mesos. Sometimes executors fail which is normal(one of the reasons is temp port 
conflict). With time - less and less executors are valid for the driver, so it 
creates situation where Mesos cluster has free resource but no-one uses them


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