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https://issues.apache.org/jira/browse/BEAM-4036?focusedWorklogId=89207&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-89207
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ASF GitHub Bot logged work on BEAM-4036:
----------------------------------------

                Author: ASF GitHub Bot
            Created on: 10/Apr/18 00:54
            Start Date: 10/Apr/18 00:54
    Worklog Time Spent: 10m 
      Work Description: aaltay commented on a change in pull request #5072: 
[BEAM-4036] Fix pickling for "recursive" classes.
URL: https://github.com/apache/beam/pull/5072#discussion_r180271017
 
 

 ##########
 File path: sdks/python/apache_beam/internal/pickler.py
 ##########
 @@ -48,7 +48,12 @@ def _is_nested_class(cls):
 def _find_containing_class(nested_class):
   """Finds containing class of a nestec class passed as argument."""
 
 Review comment:
   Could you also fix the typo here: `nestec class` -> `nested class`

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Issue Time Tracking
-------------------

    Worklog Id:     (was: 89207)
    Time Spent: 20m  (was: 10m)

> Pickler enters infinite recursion with self-referential classes
> ---------------------------------------------------------------
>
>                 Key: BEAM-4036
>                 URL: https://issues.apache.org/jira/browse/BEAM-4036
>             Project: Beam
>          Issue Type: Bug
>          Components: sdk-py-core
>            Reporter: Chuan Yu Foo
>            Assignee: Ahmet Altay
>            Priority: Major
>          Time Spent: 20m
>  Remaining Estimate: 0h
>
> 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: 
> {code}
> class RecursiveClass(object):
>  SELF_TYPE = None
>  def __init__(self, datum)
>    self.datum = 'RecursiveClass:%s' % datum
> RecursiveClass.SELF_TYPE = RecursiveClass
> {code}
> 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.



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