Is datawarehouse considered as datalake in big data environnment?
Check out this article: http://www.kdnuggets.com/2015/09/data-lake-vs-data-warehouse-key-differences.html

Looks like the answer is yes, your DWH can be defined as datalake because you are adding unstructured data.  Here is an excerpt:


  “A data lake is a storage repository that holds a vast amount of raw data in its native format, including structured, semi-structured, and unstructured data. The data structure and requirements are not defined until the data is needed.”