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From "Prasad Chakka (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HIVE-316) External table definitions should be allowed outside of Warehouse Filesystem
Date Tue, 10 Mar 2009 18:18:50 GMT

    [ https://issues.apache.org/jira/browse/HIVE-316?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12680567#action_12680567

Prasad Chakka commented on HIVE-316:

Warehouse.java: 86, 94
you should guard against null return from getFs() or make getFs throw an exception. I would
prefer an exception since it is an error if Hive doesn't know what is the file system of a

otherwise it looks good, but adding the test that Namit suggested would be great.

> External table definitions should be allowed outside of Warehouse Filesystem
> ----------------------------------------------------------------------------
>                 Key: HIVE-316
>                 URL: https://issues.apache.org/jira/browse/HIVE-316
>             Project: Hadoop Hive
>          Issue Type: Improvement
>          Components: Metastore
>            Reporter: Richard Lee
>         Attachments: hive-external-filesystems.diff
> I have a situation where I have hive's datastore pointed at an hdfs, but would like to
create an external table on data accessable from an outside data storage solution exported
via nfs.  
> Presently, Warehouse.java aggregates only a single FileSystem object which limits all
tables, both internal and external to being relative to the URl specified in the hive configuration.
 I feel like the Warehouse code should prefer to use the configured warehouse URI for non-absolute
Paths, but honor paths outside of the Warehouse; particularly when they are defined in external
> I was going to implement this by adding a Map of FileSystem objects to the Warehouse
object.  This map gets populated with FileSystem objects when operations cannot be performed
by either the warehouse FS, or any other FS object in the map.  I am not sure what impact
this change would have on hive overall... or if this is the only place that this change would
need to be made.
> Please advise.

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