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From "Richard Lee (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HIVE-316) External table definitions should be allowed outside of Warehouse Filesystem
Date Fri, 20 Mar 2009 17:14:50 GMT

    [ https://issues.apache.org/jira/browse/HIVE-316?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12683947#action_12683947
] 

Richard Lee commented on HIVE-316:
----------------------------------

Namit, I re-checked out trunk and applied my patch to it so that i have a clean tree... i
then ran the test 4 times in a row with the following:

ant test -Dtest.include=TestCliDriver -Dqfile=external_table_join.q

Could not reproduce the error to debug. Were you merging multiple changes?  Let me know if
there are any other steps that I can try to reproduce the issue.

> 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
>            Assignee: Richard Lee
>         Attachments: external_table1.q, external_table1.q.out, external_table_join.q,
hive-external-filesystems.diff, hive-external-filesystems2.diff, hive-external-filesystems3.diff,
hive-external-filesystems5.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
tables.
> 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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