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https://issues.apache.org/jira/browse/HIVE-316?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12677605#action_12677605
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Richard Lee commented on HIVE-316:
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If you specify a file:// URI for the external table definition, it eventually
gets passed to Warehouse.mkdirs(). That explicitly calls fs.mkdirs() which
will throw an exception if the URI is outside of the FileSystem specified in
the hive configuration. If i had specified a file:// URI in the hive
configuration that'd work, but i don't want ALL of my hive operations to be
done on my external storage.
> 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
>
> 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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