Github user yaooqinn commented on the issue:
https://github.com/apache/spark/pull/17335
with this creds provided by HiveCredentialProvider and configured by
`hive.metastore.kerberos.principal`, do we need to re-login with
`spark.yarn.principal` aiming to connect metastore?
I guess that `spark.yarn.principal` is used to auth yarn's rm to submit
apps, `hive.metastore.kerberos.principal` to metastore, and
`dfs.namenode.kerberos.principal` to namenode, all these and other principals
are used by spark driver to connect different servicesï¼ am I rightï¼
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