Github user yuanboliu commented on the issue:

    https://github.com/apache/spark/pull/21690
  
    @koeninger Thanks for your reply. Agree with you. there is no need to to 
use pause repeatedly. 
    This is my test without any pause, and the app master stuck for a long time 
without any process
    
    
    
    
![wechatworkscreenshot_abb443bd-97db-48f9-88a2-e45a65617f80](https://user-images.githubusercontent.com/5643344/42409693-b324d45e-8210-11e8-96eb-39fc359b1b42.png)
    
    I will update my patch shortly.



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