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From "Aaron T. Myers (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-2802) Support for RW/RO snapshots in HDFS
Date Thu, 01 Nov 2012 05:43:32 GMT

     [ https://issues.apache.org/jira/browse/HDFS-2802?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Aaron T. Myers updated HDFS-2802:

    Attachment: snapshot-design.tex

Hello all, attached please find an updated design proposal which attempts to merge the two
designs as I previously described in [this comment|https://issues.apache.org/jira/browse/HDFS-2802?focusedCommentId=13485761&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13485761].
This hybrid design merges the concepts of a snapshottable directory and user-initiated snapshots
from the designs posted by Nicholas and Suresh, with the NN snapshot representation and client
materialization of snapshots from the earlier design I posted. This document also expands
upon the CLI commands/API that would be supported, as well as provide more details on how
users would be able to access the snapshots available to them.

Please have a look and review. I'd appreciate any feedback you have.

I'm also uploading the .tex file used to produce this document and have removed the author
listing. I hope this facilitates collaborating on a single design that we can eventually all
agree to.
> 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-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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