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Implementing a star schema (facts & dimension model)

I am new to data warehousing in hadoop. This might be a trivial question
but I was unable to find any answers in the mailing list.
My questions are:
A person has an existing data warehouse that uses a star schema
(implemented in a mysql database).How to migrate it to Hadoop?
I can use sqoop to copy my tables to hive, that much I know.

But what happens to referential integrity? since there are no primary key /
foreign key concepts.
I have seen that I can use Hive & Hbase together. Is there a method for
storing facts and dimension tables in hadoop using Hive & Hbase together?
Does putting dimensions in Hbase & facts in Hive make any sense? or should
it be the other way around?

Consider de-normalization is not an option.
What is the best practice to port an existing data warehouse to hadoop,
with minimum changes to the database model?

Please let me know with whatever views you have on this.

Bejoy KS 2012-10-22, 11:29
Shreepadma Venugopalan 2012-10-22, 18:01
Manish Bhoge 2012-10-22, 11:34