rohdesamuel opened a new pull request #13335:
URL: https://github.com/apache/beam/pull/13335


   Worst issue of BEAM-10921 was clearing the InteractiveEnvironment when other 
tests were running. This caused the flakiness. Fixing this, it was shown that 
getting the user_pipeline was broken due to an incorrect assumption that 
PCollection proto IDs were unique across all pipelines. After fixing this, I 
found that the pipeline.py clobbers the pipeline reference when doing a run() 
with different a new pipeline reference given to the run_pipeline() method. 
Other places also had non-idempotent testing, and a new limiter interface was 
added to the BackgroundCachingJob.
   
   The fixes are, unfortunately, interlinked with each other and a single PR 
must be made to fix all at once.
   
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