Alan Gates commented on HIVE-18685:

{quote}bq. How would this work with notifications? DO you envision a single 
stream of notifications which just includes catalog in the message or separate 
streams per catalog? Note that notifications are currently strictly serialized 
using DB lock.{quote}

I hadn't planned on splitting out the notifications per catalog, as I assume 
whoever is following the notification stream will want to see it for all the 
catalogs. If we start seeing lock contention issues here we can work on how to 
reduce those.


> 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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