Github user vanzin commented on the issue:

    https://github.com/apache/spark/pull/18253
  
    To illustrate what I'm trying to say, here's what `top` says for an *idle* 
spark-shell with your code:
    
    ```
      PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND 
                                            
    24247 vanzin    20   0 6778304 766336  31836 S 201.0  2.3   1:34.06 java  
    ```
    
    I hope you see why that's an issue.


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