Github user jerryshao commented on the issue:
https://github.com/apache/spark/pull/19103
@tgravescs , I think it is in `AMCredentialRenewer` we explicitly create a
new `Credential` every time when issuing new tokens.
```
// HACK:
// HDFS will not issue new delegation tokens, if the Credentials object
// passed in already has tokens for that FS even if the tokens are
expired (it really only
// checks if there are tokens for the service, and not if they are
valid). So the only real
// way to get new tokens is to make sure a different Credentials object
is used each time to
// get new tokens and then the new tokens are copied over the current
user's Credentials.
// So:
// - we login as a different user and get the UGI
// - use that UGI to get the tokens (see doAs block below)
// - copy the tokens over to the current user's credentials (this will
overwrite the tokens
// in the current user's Credentials object for this FS).
```
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