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https://issues.apache.org/jira/browse/HDFS-2802?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13491307#comment-13491307
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Konstantin Shvachko commented on HDFS-2802:
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We still need to solve 2 API problems, mentioned in my previous
[comment|https://issues.apache.org/jira/browse/HDFS-2802?focusedCommentId=13489599&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13489599].
# rm (with or without -r) should be banned on snapshots, which will make them
read-only.
We should use a different option (rm -snapshot ?) that will actually delete the
snapshot.
# We should have a way to discover snapshots in the namespace tree. Using ls
-snapshot may be the answer.
> 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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