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https://issues.apache.org/jira/browse/HDFS-3370?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13405142#comment-13405142
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Konstantin Shvachko commented on HDFS-3370:
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Jesse, thanks for the detailed proposal. It totally addresses the complexity of
issues related to hard links implementation in distributed environment.
Do I understand correctly that your hidden inodes can be regular HDFS files,
and that then the whole implementation can be done on top of existing HDFS, as
a stand alone library supporting calls, like createHardLink(),
deleteHardLink(). The applications then will use this methods if they want the
functionality.
Just trying to answer Sanjay's questions using your design as an example.
> 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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