yaooqinn commented on pull request #33674:
URL: https://github.com/apache/spark/pull/33674#issuecomment-905152050


   IIUC, the executors get tokens from the driver periodically, and it has 
nothing to do with an actual job.
   
   > delegation token has to go through KDC
   
   IIUC, this is not true either.  Clients need to get TGT from KDC via keytabs 
but do not need to negotiate with KDC every time as long as they start use 
tokens


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