[GitHub] [beam] kennknowles opened a new issue, #18934: Pickler enters infinite recursion with self-referential classes

[GitBox <gi...@apache.org>]

kennknowles opened a new issue, #18934:
URL: https://github.com/apache/beam/issues/18934

   The pickler recurses infinitely and dies with maximum recursion limit exceeded when a module contains a self-referential class (or any class which is part of a cycle).
   
   Here's a minimal example: 
   ```
   
   class RecursiveClass(object):
    SELF_TYPE = None
   
    def __init__(self, datum)
      self.datum = 'RecursiveClass:%s'
   % datum
   
   RecursiveClass.SELF_TYPE = RecursiveClass
   
   ```
   
   If this is in a module, then the pickler will enter the infinite recursion when trying to pickle any nested class in that module.
     
   
   An actual example is with typing.Type, which is part of a cycle typing.Type -\> type -\> object -\> typing.Type. If a module contains an attribute that refers to typing.Type, such as a type alias, it will trigger this bug.
   
   Imported from Jira [BEAM-4036](https://issues.apache.org/jira/browse/BEAM-4036). Original Jira may contain additional context.
   Reported by: chuanyu.


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