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From "Aaron T. Myers (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2802) Support for RW/RO snapshots in HDFS
Date Tue, 06 Nov 2012 00:04:16 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2802?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13491060#comment-13491060

Aaron T. Myers commented on HDFS-2802:

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

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