Github user manku-timma commented on the pull request:
https://github.com/apache/spark/pull/8186#issuecomment-132618967
Say the metastore DB admin has created a place to save the data of all
tables by default. This applies to all spark (and other) jobs that use the
metastore.
Now if a particular spark job wants to save data to another location for
all its tables, it can override only that param via hive-site.xml (or SET
command) and get the data stored elsewhere. So the spark app writer gets
flexibility in choosing the data location.
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