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https://issues.apache.org/jira/browse/HADOOP-12092?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14587768#comment-14587768
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Steve Loughran commented on HADOOP-12092:
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There is already a JIRA for this, with a patch, its not something anyone has
sat down to work with yet. I did see that it didn't make the feature optional,
which is critical to maintain backwards compatibility.
> Issues with sub-directories in Swift
> ------------------------------------
>
> Key: HADOOP-12092
> URL: https://issues.apache.org/jira/browse/HADOOP-12092
> Project: Hadoop Common
> Issue Type: Improvement
> Components: fs/swift
> Reporter: Gil Vernik
> Assignee: Gil Vernik
>
> OpenStack swift doesn't have notion of directories or sub-directories. In
> Swift everything is object, stored in container, that belongs to account.
> Openstack Swift allows objects to have delimiters and than users can access
> and filter those objects using delimiter.
> Very good explanation appear here
> http://docs.rackspace.com/files/api/v1/cf-devguide/content/Pseudo-Hierarchical_Folders_Directories-d1e1580.html
> Current driver has many code that create nested directories as zero length
> objects. While it might be needed for some cases, in general this
> is wrong when working with Swift and highly affects performance of the driver.
> The goal of this Jira is too make "sub-directories" generation as a
> configurable option. There will be option that will allow to disable
> sub-directories generation and this will highly improve the performance.
> Example: client perform PUT account/container/a/b/c/d/e/f/g.txt and driver is
> configured not to use sub-directories in Swift, than only one object
> "a/b/c/d/e/f/g.txt" will be generated in the container.
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