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From "Ashish Thusoo (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HIVE-1788) Add more calls to the metastore thrift interface
Date Wed, 16 Feb 2011 23:48:29 GMT

    [ https://issues.apache.org/jira/browse/HIVE-1788?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12995586#comment-12995586
] 

Ashish Thusoo commented on HIVE-1788:
-------------------------------------

In my particular application I need to get the entire table object. If I get only the names
and then call back to the metastore to get a table object at a time, it will be very slow.
I have not measured the speed of the call with many tables, however, the hope is that with
the offset and limit fields the application can stream those tables across multiple calls
as opposed to getting them in one single gigantic batch. I will do the measurement though
to find out how bad this is.

The offsets would not be consistent if new tables are created in between, however, this level
of consistency is not needed by the application. Think of an application displaying all the
tables and their associated columns for a particular user and does that in a paginated way.
During pagination if new tables appear or disappear is not critical from the application point
of view. The only other way of ensuring that things are consistent would be to run the whole
query without offsets and limits or do all this in a long transaction. The later would be
bad because it will hold locks on tables while pagination is happening and that would be really
bad for other clients. Thoughts?

> Add more calls to the metastore thrift interface
> ------------------------------------------------
>
>                 Key: HIVE-1788
>                 URL: https://issues.apache.org/jira/browse/HIVE-1788
>             Project: Hive
>          Issue Type: New Feature
>            Reporter: Ashish Thusoo
>            Assignee: Ashish Thusoo
>         Attachments: HIVE-1788.txt
>
>
> For administrative purposes the following calls to the metastore thrift interface would
be very useful:
> 1. Get the table metadata for all the tables owned by a particular users
> 2. Ability to iterate over this set of tables
> 3. Ability to change a particular key value property of the table

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