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https://issues.apache.org/jira/browse/HDFS-2802?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13488489#comment-13488489
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Aaron T. Myers commented on HDFS-2802:
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Hi Konstantin,
bq. I like the idea of generating globally unique version ids, and assigning
them to snapshots internally rather than letting people invent their own. One
can always list available versions and read the desired one. So the
-createSnapshot command does not need to pass <snapname>, but will instead get
it in return.
Please take a look at the updated design document I just uploaded. It goes into
a lot more detail about how snapshots would be named and accessed by users.
From my understanding of you're suggestion, I think it describes pretty much
exactly what you propose with regard to this.
> 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: 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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