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From "Mark Grover (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-2837) insert into external tables should not be allowed
Date Thu, 31 May 2012 20:36:23 GMT

    [ https://issues.apache.org/jira/browse/HIVE-2837?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13286907#comment-13286907
] 

Mark Grover commented on HIVE-2837:
-----------------------------------

>From looking at this, it seems like it applies to external tables on HDFS as well. Can
you please confirm this is correct?
Technically, insert into should be ok for external tables on HDFS (and S3) as well. Seems
like a storage file system level thing to specify whether insert into is applied and implement
it.

Some context for you:
Historically, there hasn't been any real difference between creating an external table on
HDFS vs creating a managed one. However, if we disallow insert into on external tables, that
would mean that folks with external tables on HDFS wouldn't be able to make use of insert
into functionality even though they should be able to. This would make new tables to be biased
towards managed tables but what about the people who already have their entire Hive warehouses
based on external tables?
                
> insert into external tables should not be allowed
> -------------------------------------------------
>
>                 Key: HIVE-2837
>                 URL: https://issues.apache.org/jira/browse/HIVE-2837
>             Project: Hive
>          Issue Type: Bug
>            Reporter: Namit Jain
>            Assignee: Namit Jain
>             Fix For: 0.9.0
>
>         Attachments: HIVE-2837.D2211.1.patch, HIVE-2837.D2211.2.patch
>
>
> This is a very risky thing to allow. 
> Since, the external tables can point to any user location, which can potentially corrupt
some other tables.

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