Github user jerryshao commented on the issue:

    https://github.com/apache/spark/pull/18230
  
    From my understanding this two configurations will also point to expired 
timestamp, since each started application will reset it, so no need to 
checkpoint them.
    
    I think all the Spark on YARN internal configurations used for internal 
state tracking and passing needn't to checkpoint, they will always be updated 
in yarn client's launching.


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