[GitHub] spark issue #17238: getRackForHost returns None if host is unknown by driver

[morenn520]

Github user morenn520 commented on the issue:

    https://github.com/apache/spark/pull/17238
  
    Thanks @tgravescs , we has used a dynamic topology discovery script to 
avoid this problem. Since tez and mr don‘t do this, maybe spark could not fix 
this problem.


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