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https://issues.apache.org/jira/browse/HDFS-2802?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13491060#comment-13491060
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Aaron T. Myers commented on HDFS-2802:
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bq. It would be useful to allow users to be able to set directories in their
own home dir as 'snapshottable'.
Not suggesting this is a bad idea, but if we do decide to go with this then I
think we should relax the proposed restriction that renames of
files/directories must only be within the subtree of a snapshottable root, as
described in part 1a of "Operations Supported on Snapshots" section of the most
recent design document posted by Suresh. I think users might be surprised to
find that because they've marked two directories in their home dir as
snapshottable that they cannot then rename files/dirs between those
directories. (I realize the document already says "this can be revisited" - I'm
just pointing out that this might be a good reason to revisit it.)
> Support for RW/RO snapshots in HDFS
> -----------------------------------
>
> Key: HDFS-2802
> URL: https://issues.apache.org/jira/browse/HDFS-2802
> Project: Hadoop HDFS
> Issue Type: New Feature
> Components: data-node, name-node
> Reporter: Hari Mankude
> Assignee: Hari Mankude
> Attachments: HDFS-2802.20121101.patch,
> HDFS-2802-meeting-minutes-121101.txt, HDFSSnapshotsDesign.pdf, snap.patch,
> snapshot-design.pdf, snapshot-design.tex, snapshot-one-pager.pdf,
> Snapshots20121018.pdf, Snapshots20121030.pdf
>
>
> Snapshots are point in time images of parts of the filesystem or the entire
> filesystem. Snapshots can be a read-only or a read-write point in time copy
> of the filesystem. There are several use cases for snapshots in HDFS. I will
> post a detailed write-up soon with with more information.
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