xinbinhuang commented on PR #17873:
URL: https://github.com/apache/flink/pull/17873#issuecomment-1131864394

   > @xinbinhuang Thanks for the update. Could you explain why you need to 
derive the total task slots required from the JSON graph?
   
   Our team wants to derive the total slots required for the job before 
redeploying. This help avoid the situation where the old job is stopped and the 
new job doesn't have enough resources to start. With this change we can make 
sure the cluster has enough resources for the new job first before stopping the 
old one. In general, I think slots sharing groups is an useful information to 
better understand the job for debugging and performance tuning. WDYT?


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