claudevdm opened a new pull request, #32571:
URL: https://github.com/apache/beam/pull/32571

   Make parent thread state sampler available in child thread when running 
ParDo#with_exception_handling(timeout).
   
   - ParDo#with_exception_handling(timeout) executes the DoFn in a new thread 
[1]
   - Incrimenting a counter invokes tries to access the state sampler that was 
declared in the main thread local storage from the child thread [2]
   - Since the child thread does not have access to the state sampler from the 
main thread the get_current_tracker method fails silently [3] and the counter 
isnt actually incremented
   
   This change 
   
   [1] 
https://github.com/apache/beam/blob/1eddbdca4c5efe4bfccc11af29624f9689ea2997/sdks/python/apache_beam/transforms/core.py#L2599
   [2] 
https://github.com/apache/beam/blob/1eddbdca4c5efe4bfccc11af29624f9689ea2997/sdks/python/apache_beam/runners/worker/statesampler.py#L43
   [3] 
https://github.com/apache/beam/blob/1eddbdca4c5efe4bfccc11af29624f9689ea2997/sdks/python/apache_beam/runners/worker/statesampler.py#L54
 
   
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