@feng-tao Not sure about what's our timeline for 1.10.1 but there are two other 
PRs about the same topic coming in the next week and they are less mature( in 
terms of time they've been running in our cluster). I would hope if we make 
this into 1.10.1 we make three of them in together. ( With three of them 
together, conservatively Airflow should be able to handle 30k concurrent 
running tasks and 4k DAG files while meeting 5 mins, even in extreme cases like 
30k tasks need to be scheduled at the same time)

@aoen @Fokko @bolkedebruin @mistercrunch @afernandez @saguziel @YingboWang PTAL

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