zentol commented on PR #20003:
URL: https://github.com/apache/flink/pull/20003#issuecomment-1162750463

   I'm pretty sure you are correct.
   
   We never actually had the case where we had a tree of classloaders with 
different order settings between nodes.
   It's always been either all child-first or all parent-first.
   
   We'd have to change directions several times (from a call to the child CL, 
go up to default jars and try loading the class, _then_ drill down to other 
user jars and try loading the class, then jump up to the Flink CL and try 
loading the class).
   That's just not supported. (And really we shouldn't because good look 
wrapping your head around that).
   
   So let's discard _that_ idea.


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