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From "Eli Collins (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2802) Support for RW/RO snapshots in HDFS
Date Mon, 05 Nov 2012 21:08:12 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2802?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13490929#comment-13490929

Eli Collins commented on HDFS-2802:

Hey Jagane,
With regard to your first comment, the goal is definitely not to have dueling proposals, the
doc ATM posted only attempts to flesh out things in the first proposal that were not covered
or left as future work. Namely, (a) snapshot creation time and memory usage should be O(1),
and (b) consistency semantics sufficient to implement HBase snapshots. We think these are
fundamental requirements that should be addressed in the initial design vs fixed up later;
which is why we started fleshing out a design that satisfies them, not to push on a separate
proposal. 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.
> 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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