More information on ATLAS-491, can be found in the HDP documentation. Please note Business Taxonomy is still Tech Preview, not GA.
RANGER-1100: is related to row filter/column level masking in hive. Please go through the below wiki - which has all the details on this feature.
Dinesh Das Ranger-1100 is about blocking all the update operations (insert, insert_overwrite, update, delete, truncate) if there is a row filter and column masking policy. so eg. there is row filter or column masking policy on resource:
users : user1,user2
then user1 & user2 will be not be allowed to perform any update operations (insert, insert_overwrite, update, delete, truncate).