satybald commented on pull request #15185:
URL: https://github.com/apache/beam/pull/15185#issuecomment-895579998


   While running the pipeline with runner V2, I found that pipeline logs 
significant amount of error i.e. 5K log lines per 5min in the end of the job. 
   
   ```
   apache_beam.runners.common.PerWindowInvoker.try_split File 
"apache_beam/runners/common.py", line 1036,
    in apache_beam.runners.common.PerWindowInvoker._try_split 
   File 
"/usr/local/lib/python3.7/site-packages/apache_beam/runners/sdf_utils.py", line 
124, 
   in try_split return 
self._restriction_tracker.try_split(fraction_of_remainder) 
   File "/usr/local/lib/python3.7/site-packages/apache_beam/io/iobase.py", line 
1519, 
   in try_split return self.restriction.try_split(fraction_of_remainder) 
   File "/usr/local/lib/python3.7/site-packages/apache_beam/io/iobase.py", line 
1459, in 
   try_split position = self.range_tracker().position_at_fraction(fraction) 
   File 
"/usr/local/lib/python3.7/site-packages/apache_beam/io/range_trackers.py", line 
325, in position_at_fraction return 
self._range_tracker.position_at_fraction(fraction) 
   File 
"/usr/local/lib/python3.7/site-packages/apache_beam/io/range_trackers.py", line 
199, 
   in position_at_fraction 'get_position_for_fraction_consumed is not 
applicable for an 
   ' Exception: get_position_for_fraction_consumed is not applicable for an 
unbounded range
   ```
   ![Screenshot from 2021-08-09 
14-53-40](https://user-images.githubusercontent.com/2764630/128779855-08878cc1-77d9-4e0b-a515-562ddaa730ea.png)
   


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