Github user jerryshao commented on the issue:
https://github.com/apache/spark/pull/14789
@tgravescs , with
[SPARK-14743](https://issues.apache.org/jira/browse/SPARK-14743),
credentials/tokens can be managed out of Spark with their own credential
provider. In that case user could update the credentials based on configuration
changes or something else. For example: we could write a dynamic HBase
credential provider which loads configuration from HDFS, once user what to
change to another HBase cluster, they could update configuration files in HDFS
and trigger credential updating manually using the API provided in this PR. It
is mainly based on how user implement their own credential provider. What here
provided is just a manual credential update mechanism, when and how to trigger
this is relying on user.
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