Github user LantaoJin commented on the issue:
https://github.com/apache/spark/pull/21396
@jerryshao
Simply speaking, in a security environment, if we use JDBC to connect to
mysql directly instead of accessing hive metastore, current implementation
blocks job execution.
And why **not** access metastore is tricky, that's because the firewall
issue between spark and metastore. It should be resolved in our side. But in
the code path, we still can chose whether or not enable metastore, and after
#20784 , the approach of DB direct-connect will be blocked.
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