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From "Suresh Srinivas (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2802) Support for RW/RO snapshots in HDFS
Date Mon, 05 Nov 2012 21:38:17 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2802?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13490951#comment-13490951

Suresh Srinivas commented on HDFS-2802:

bq. It would be useful to allow users to be able to set directories in their own home dir
as 'snapshottable'.
Jagane. This is really a good idea. This makes the administration simpler. Will add it to
the next iteration of design doc.

bq. We think these are fundamental requirements that should be addressed in the initial design
vs fixed up later;
Eli, please read the comments. While this is how the discussions started, I disagree in this
case we could not have incrementally improved it. Anyway discussing this is a moot point now,
because we reorganized our work and have addressed the issues brought up and the efficient
implementation is now almost done.

bq. If Suresh and Nicholas now agree, which I think they do, correct me if I'm wrong, that
we should come up with a design that handles these requirements first, rather than go with
the original approach and modify it later then I think we should merge these two design documents,
which is what ATM was attempting to do.
I am not sure if you are on top of all the discussions and design udpates. The design has
already addressed the concerns here. Please read why this design is superior as well [here|https://issues.apache.org/jira/browse/HDFS-2802?focusedCommentId=13487447&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13487447]
> 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: 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 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

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