shuwang21 commented on PR #41225:
URL: https://github.com/apache/spark/pull/41225#issuecomment-1554049148

   LGTM. Thanks for your efforts!
   
   Do you think when `spark.network.crypto.saslFallback=true` and L95 from 
`AuthRpcHandler.java`. 
   ```
   saslHandler = new SaslRpcHandler(conf, channel, null, secretKeyHolder);
   ```
   which will set `delegate=null`. Will this cause potential NPE? 
   
   


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