squito opened a new pull request #23441: [SPARK-26349][PYSPARK] Forbid insecure 
py4j gateways
URL: https://github.com/apache/spark/pull/23441
 
 
   Spark always creates secure py4j connections between java and python,
   but it also allows users to pass in their own connection. This ensures
   that even passed in connections are secure.
   
   Added test cases verifying the failure without the extra configuration.
   
   For the tests, I added ways to create insecure gateways, but I tried to put 
in protections to make sure that wouldn't get used incorrectly.
   
   This is closely related to SPARK-26019, but this entirely forbids the
   insecure connection, rather than creating the "escape-hatch".

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