curcur edited a comment on pull request #15200:
URL: https://github.com/apache/flink/pull/15200#issuecomment-810002177


   Main issues:
   
   1. Loader seems a bit too hacky, I am not sure whether we can use it this 
way, need @pnowojski to take a look
   2. Map iterators, have some uncertainties, commented in place
   3. Aggregating State, whether we want to use `update` to simulate `add`. I 
guess this is not our original intention.
   4. How to differentiate PriorityQueue changes, also commented in place.
   
   Tests are not reviewed yet, I will review tests now.
   
   Additionally, would you please move metadata changes to recovery, I have not 
reviewed that part as well.


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