Where does datawarehousing concepts fit in big data?


Hy, i am having question please answer of some one can.
In datwarehouse we make dimensional model consist of star or snowflake schema with fact table aka transactional table. My question is in big data/ data lake do we need to follow same practice with structured data?
Now where does structured data stands i mean its usage and importance in analytical world?

We are building our own datalake with open source tool for end to end advanced analytics.