Q:

Multiple databases or namespace in Hbase

Is there a way to setup Hbase so we can create multiples databases inside the same cluster ?

A:

Just to refresh topic: http://hbase.apache.org/book.html#namespace
5.3.1. Namespace management
A namespace can be created, removed or altered. Namespace membership is determined during table creation by specifying a fully-qualified table name of the form:
:
Example 5.1. Examples
#Create a namespace
create_namespace 'my_ns'

#create my_table in my_ns namespace
create 'my_ns:my_table', 'fam'

#drop namespace
drop_namespace 'my_ns'

#alter namespace
alter_namespace 'my_ns', {METHOD => 'set', 'PROPERTY_NAME' => 'PROPERTY_VALUE'}

A:

No there's none. However, you can use prefixes for table names to separate a set of tables from another set.
I didn't test ACLs before, but I think you can use them in recent versions of hbase > 0.92 to allow access to some tables and prevent access to others per user.

