zentol edited a comment on pull request #16681:
URL: https://github.com/apache/flink/pull/16681#issuecomment-891736196


   > I can imagine having some kind of listener on the invokable, that would 
let you know about addition or removal of a sub-task to avoid busy waiting
   
   That's what we had before, but it's unreliable if you don't know how often 
the job restarts, when during the deployment process it happens, and which 
parallelism it uses.


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