scwhittle opened a new pull request, #37123:
URL: https://github.com/apache/beam/pull/37123

   Clearing the side-input in finish_bundle is a balance that allows refreshing 
the input in streaming while not affecting performance as much. However this 
requires the sdk state_cache to be enabled to avoid repeated lookups to the 
runner.
    I was originally trying to optimize the code other ways but most of the 
overhead appears to be due to cython/Python interactions so the fast-path cache 
for repeated process invocations is important. 
   
   Improve the map_fn test by using common utilities.
   Add support to benchmarks to add profiling.
   ------------------------
   
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