HeartSaVioR commented on pull request #31056:
URL: https://github.com/apache/spark/pull/31056#issuecomment-755074448


   I just fixed the smallest thing as a short-term solution (the problem will 
persist for end users using Kafka delegation token), as Spark 3.1.0 RC vote is 
happening and I don't want to drag the release too much.
   
   It would be ideal if we deal with long-term solution (making overhead of 
`HadoopDelegationTokenManager.isServiceEnabled` be minor, or reduce occurrence 
of the check heavily) in time, but just wanted to be safe.


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