vanzin commented on issue #24785: [SPARK-27937][CORE] Revert partial logic for 
auto namespace discovery
URL: https://github.com/apache/spark/pull/24785#issuecomment-505213002
 
 
   > Technically a federation config doesn’t even belong in a client config and 
as such should never be used by a client.
   
   Well, technically you have similar configuration on the client so that the 
viewfs mount points can reference the appropriate namespaces... but that's 
nitpicking.
   
   But in general I agree that it feels weird for the client to be looking at 
random HDFS configurations (in fact I made a similar comment on the original 
review and requested to special-case viewfs if the config scraping code was 
going to be added).
   
   Given that I'm ok with removing the config scraping code. Viewfs users 
(which in my view should be all users accessing a federated HDFS) shouldn't see 
any difference. Those using the Spark config should not see any difference 
either. Only those relying on a weird HDFS config that had multiple configured 
namespaces but not viewfs should see a difference... but well, it's the price 
to pay if this causes problems for people.
   
   (I haven't looked at the code yet.)

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