[jira] [Created] (BEAM-12573) Bounded Source Reader DoFn PR #13154 causes some pipelines to fail with a PicklingError

["Valentyn Tymofieiev (Jira)" <ji...@apache.org>]

Valentyn Tymofieiev created BEAM-12573:
------------------------------------------

             Summary: Bounded Source Reader DoFn PR #13154  causes some pipelines to fail with a PicklingError 
                 Key: BEAM-12573
                 URL: https://issues.apache.org/jira/browse/BEAM-12573
             Project: Beam
          Issue Type: New Feature
          Components: io-py-common
            Reporter: Valentyn Tymofieiev


As reported in [1], when trying to run the coders.py cookbook example [2], it raises an
exception

```
   PicklingError : _pickle.PicklingError: Can't pickle <class
'__main__.JsonCoder'>: it's not the same object as __main__.JsonCoder
[while running 'read/Read/Map(<lambda at iobase.py:899>)']
```

To reproduce the issue, run:
```
  python coders.py --input input.ndjson --output output.txt
```

Where the input file (input.ndjson) has the same values as coders_test.py:
```
{"host": ["Germany", 1], "guest": ["Italy", 0]}
{"host": ["Germany", 1], "guest": ["Brasil", 3]}
{"host": ["Brasil", 1], "guest": ["Italy", 0]}
```

I have tracked the change in behavior to[3] with git bisect. This needs further investigation to understand the issue. 

[1] https://lists.apache.org/thread.html/r45340bbee91a6caf798fe62d24388f645f8792cc7506351fd66adec3%40%3Cdev.beam.apache.org%3E
[2] https://github.com/apache/beam/blob/35bac6a62f1dc548ee908cfeff7f73ffcac38e6f/sdks/python/apache_beam/examples/cookbook/coders.py
[3]  https://github.com/apache/beam/pull/13154



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