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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 Wed, 31 Oct 2012 03:29:36 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2802?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13487489#comment-13487489
] 

Aaron T. Myers commented on HDFS-2802:
--------------------------------------

Hi Suresh, thanks a lot for posting an updated design doc. From my quick look, this seems
to clarify much of the proposed design.

I do have one question for you from my quick read of this updated doc: It seems that since
every current file which is snapshotted is represented by an INodeFileWithLink, at some point
all files which are to be snapshotted under a sub-directory would need to be converted from
an INodeFile to an INodeFileWithLink. When would this conversion take place? Perhaps when
the directory is marked as being snapshottable using the `dfsadmin -allowSnapshot' command?
Or perhaps when a snapshot is first created of a snapshottable directory? (Not suggesting
this is unacceptable - just trying to understand the design.)
                
> 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-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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