Alan Gates commented on HIVE-18685:

I haven't worked through how having one Hive instance attach to another would 
work.  I don't want to tie catalog and Thrift server 1-1, but we may find it 
useful to scale the system by adding different metastore instances serving 
distinct catalogs.  When get to this part we'll need to look closely at the use 
cases and then figure out the best way to do it.

> Add catalogs to metastore
> -------------------------
>                 Key: HIVE-18685
>                 URL: https://issues.apache.org/jira/browse/HIVE-18685
>             Project: Hive
>          Issue Type: New Feature
>          Components: Metastore
>    Affects Versions: 3.0.0
>            Reporter: Alan Gates
>            Assignee: Alan Gates
>            Priority: Major
>         Attachments: HMS Catalog Design Doc.pdf
> SQL supports two levels of namespaces, called in the spec catalogs and 
> schemas (with schema being equivalent to Hive's database).  I propose to add 
> the upper level of catalog.  The attached design doc covers the use cases, 
> requirements, and brief discussion of how it will be implemented in a 
> backwards compatible way.

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