alpreu commented on pull request #19035:
URL: https://github.com/apache/flink/pull/19035#issuecomment-1065090962


   > Also I would like to clarify one thing now that at-least-once delivery is 
default it might happen that users run the pipeline without checkpointing and 
without buffer flushing configured. I am afraid this leads to that the sink 
never flushes until it finishes. How did the old sink deal with that?
   
   It looks like the old sink always had `flushOnCheckpoint=true`, it seems 
that it was only possible to disable it when using the Table API and changing 
it's connector option
   


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