Github user rconline commented on the issue:
https://github.com/apache/zeppelin/pull/1315
@jongyoul this work is currently solving for AD, but is not limited to it.
Going forward users may choose to store their Hive, Hbase and other data system
passwords. These passwords as conventions get stored on HDFS, where we will
need a simplified, credential API, and therefore the choice is to use the
credential API. Also this is pretty standard implementation in the Big Data
world.
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