potiuk commented on pull request #10768:
URL: https://github.com/apache/airflow/pull/10768#issuecomment-687858419


   > Given it's test-related, I would tend to be more "picky": one check is 
failing
   
   Absolutely @XD-DENG . I am also using this PR to test the behaviour of some 
tests in/out of isolation. 
   
   It seems that we are hitting the (in)famous  Heisenbugs: 
https://en.wikipedia.org/wiki/Heisenbug
   
    If we observe them in isolation, they run just fine. but when you run them 
together with other tests, they start to fail randomly (most likely on memory 
problems). I will try to isolate those that are the Heiisnebugs and depending 
how many of those we have, I will  try to find some way to handle those (or 
maybe indeed change them permanently to run in isolation) :D.


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