Could you please give us more information about "Hadoop configuration overriding"? What does your scenario look like?
This query is more related to a certification question which I faced. I am curious to know the exact answer. Options were as below (As far as I remember):
1) We can't override configuration.
2) By adding a row to Hadoop properties table in HDFS connection component.
3) By defining a context group with variable named HADOOP_VARS
4) By runnng the job using switch - 'override-enabled'