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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