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https://issues.apache.org/jira/browse/HDFS-3370?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13405228#comment-13405228
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Andy Isaacson commented on HDFS-3370:
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The Windows ".lnk" file scheme is a pretty awful disaster, I hope that we don't
implement a similar scheme in HDFS. I don't know of an example of a
client-side shortcut scheme that worked out well (though I'd be interested to
hear of any examples).
Is there any reason to allow cross-namespace hardlinks? Why not just return
EXDEV or equivalent? As an even more restrictive example, AFS only permits
hardlinks within a single directory (not even between subdirectories).
So long as failures are clearly communicated, it seems to me that it's OK to
have a pretty restrictive implementation.
> HDFS hardlink
> -------------
>
> Key: HDFS-3370
> URL: https://issues.apache.org/jira/browse/HDFS-3370
> Project: Hadoop HDFS
> Issue Type: New Feature
> Reporter: Hairong Kuang
> Assignee: Liyin Tang
> Attachments: HDFS-HardLink.pdf
>
>
> We'd like to add a new feature hardlink to HDFS that allows harlinked files
> to share data without copying. Currently we will support hardlinking only
> closed files, but it could be extended to unclosed files as well.
> Among many potential use cases of the feature, the following two are
> primarily used in facebook:
> 1. This provides a lightweight way for applications like hbase to create a
> snapshot;
> 2. This also allows an application like Hive to move a table to a different
> directory without breaking current running hive queries.
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