Github user kiszk commented on a diff in the pull request:

    https://github.com/apache/spark/pull/19998#discussion_r157332103
  
    --- Diff: dev/run-tests.py ---
    @@ -253,9 +253,14 @@ def kill_zinc_on_port(zinc_port):
         """
         Kill the Zinc process running on the given port, if one exists.
         """
    -    cmd = ("/usr/sbin/lsof -P |grep %s | grep LISTEN "
    -           "| awk '{ print $2; }' | xargs kill") % zinc_port
    -    subprocess.check_call(cmd, shell=True)
    +    try:
    +        cmd = ("lsof -P |grep %s | grep LISTEN "
    +               "| awk '{ print $2; }' | xargs kill") % zinc_port
    +        subprocess.check_call(cmd, shell=True)
    +    except:
    --- End diff --
    
    Yes, if the command does not exist, an exception occurs. Thus, we can 
execute one of the two cases.
    
    Yea, to use `cmd` is fine.


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