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From "Jinho Kim (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (TAJO-433) Improve integration with Hive
Date Fri, 20 Dec 2013 06:57:08 GMT

    [ https://issues.apache.org/jira/browse/TAJO-433?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13853738#comment-13853738

Jinho Kim commented on TAJO-433:

I think we don't need hive metaserver. please refer to https://cwiki.apache.org/confluence/display/Hive/AdminManual+MetastoreAdmin

> Improve integration with Hive
> -----------------------------
>                 Key: TAJO-433
>                 URL: https://issues.apache.org/jira/browse/TAJO-433
>             Project: Tajo
>          Issue Type: Improvement
>          Components: catalog
>    Affects Versions: 0.8-incubating
>            Reporter: JaeHwa Jung
>            Assignee: JaeHwa Jung
>             Fix For: 0.8-incubating
> Hi, guys~ 
> I wish to discuss about HCatalogStore. current Tajo uses HCatalog to integrate catalog
with hive. So, users must run HiveMetaStoreServer because HCatalog connect HiveMetaStoreServer.

> But at this point, it needs to make improvements.
> - First is HiveMetaStoreServer. if it can fall down or it performance bottlenecks, it
will be a fatal problem for Tajo.
> - Second is HCatalog API. It doesn't provide API for DDL. So, Tajo use HCatalog API and
HiveMetaStoreClient API. 
> So, I wish to remove HiveMetaStoreServer dependency and integrate catalog with Hive using
HiveMetaStoreClient.  And I wish to use HiveMetaStoreClient API instead of HCatalog API. 
I already checked HiveMetaStoreClient to connect HiveMetaStore without HiveMetaStoreServer.
> if HiveMetaStoreClient can't connect HiveMetaStore, Tajo try to connect HiveMetaStoreServer
as backup policy.
> What do you think about this suggestion? :)

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