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https://issues.apache.org/jira/browse/HDFS-2802?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13600266#comment-13600266
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Eli Collins commented on HDFS-2802:
-----------------------------------

Hey guys,

Are you hoping to try to get this into branch-2 for 2.0.4 beta? The target 
version is currently v3. Since this is an invasive change and requires a 
metadata upgrade it's IMO something that would be hard to put in post v2 GA, 
and since we're only planning one v2 beta it seems like we'd need to target 
that release if we want this in branch-2.

Thanks,
Eli
                
> 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: datanode, namenode
>            Reporter: Hari Mankude
>            Assignee: Tsz Wo (Nicholas), SZE
>         Attachments: 2802.patch, 2802.patch, 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.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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