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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 Tue, 30 Oct 2012 07:12:24 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2802?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13486701#comment-13486701
] 

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

Hi Konstantin, if I correctly understand what you're suggesting, it sounds very similar to
what is described in the "Representing Snapshots at the NameNode" section of the design proposal
I posted. Under this scheme, each file and directory is tagged with its start and end version
numbers. The start version number represents the point in the file system history when this
file/directory came into existence, and the end version number represents the point in the
file system history where the file/directory either was modified or was deleted. Taking a
snapshot is, as you described, as simple as incrementing the current version number of the
file system (or a subtree) as you described. Would you mind taking a look at that portion
of the design document to see if it is inline with what you're thinking about?
                
> 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
>
>
> 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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