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From "Alan Gates (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FALCON-96) Hive client to talk to the metastore
Date Fri, 23 Aug 2013 22:37:51 GMT

    [ https://issues.apache.org/jira/browse/FALCON-96?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13749095#comment-13749095
] 

Alan Gates commented on FALCON-96:
----------------------------------

When you say RPC using thrift are you thinking of talking to HiveServer2 or directly to the
thrift metastore server?  You don't want to talk directly to thrift metastore.  Hive tends
to view this as an internal interface and guarantees of stability are not strong.

You could do things via HS2 but you'll get back strings rather than the JSON you'd get back
via WebHCat.  Parsing those strings will be painful.
                
> Hive client to talk to the metastore
> ------------------------------------
>
>                 Key: FALCON-96
>                 URL: https://issues.apache.org/jira/browse/FALCON-96
>             Project: Falcon
>          Issue Type: Sub-task
>    Affects Versions: 0.3
>            Reporter: Venkatesh Seetharam
>
> There are 2 choices: RPC using thrift and HTTP using webhcat. HTTP of course is preferable
but there are a few issues with it:
> * Uses cli to talk to the server implying needing Hcat install and client. This is a
PITA for integration-tests.
> * Also, there is no java wrapper around the RESTful APIs which returns Map and such.
Need to roll our own. 
> * Runs as a separate daemon (which should eventually fold into metastore or HiveServer2).
However this is short-term and a minor annoyance.
> Thoughts?

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