See all drill best practice FAQs.
This is very likely an issue with permissions. Make sure the user has the appropriate column family permissions. See http://maprdocs.mapr.com/51/#MapR-DB/JSON_DB/how_to_obtain_readperm_and_writeperm.html for steps on adding permissions.
If you’re relying on column families to inherit the default permissions of the table, note that you need to set these default permissions before creating your column families.
You can use the following command to confirm what are the currently available permissions:
maprcli table cf list -path <tablepath>
Retrieving data ...