pabloem commented on pull request #16863:
URL: https://github.com/apache/beam/pull/16863#issuecomment-1076800139


   I've run an experiment where the work distribution is not even, and dynamic 
partitioning helps achieve faster runtime and even work distribution.
   
   The current implementation, with some work items being significantly longer 
than others (runtime ~2h):
   
   
![image](https://user-images.githubusercontent.com/1301740/159787269-8a401e2e-fc2f-464e-9b82-fe8ec1799675.png)
   
   
   The implementation that I propose (runtime ~1h):
   
   
![image](https://user-images.githubusercontent.com/1301740/159787410-8eec07f5-9ab1-44a5-889d-c8b7f70b706d.png)
   
   Pending is to check effects on the database, but I'd like to start reviewing 
the code while we do that.


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