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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 Thu, 01 Nov 2012 05:47:12 GMT

    [ 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:
--------------------------------------

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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