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From "Suresh Srinivas (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2802) Support for RW/RO snapshots in HDFS
Date Fri, 02 Nov 2012 16:01:16 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2802?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13489508#comment-13489508
] 

Suresh Srinivas commented on HDFS-2802:
---------------------------------------

Konstantin, thanks for the comments.

bq. I would make the snapshot name optional in -createSnapshot (choosing names is such a hastle).
Should be easy since you already have internal unique ids.
This is a good idea. Typically the snapshot names are date+timestamp. Should we choose that
as the snapshot name when no name is provided?

bq. Suresh, do I understand correctly that files under .snapshot are read-only, so rm -r will
not remove it. You need to clarify how regular rm -r works in the design.
Yes all the contents below <path>/.snapshot/snapshotname is read-only. rm works only
at the level <path>/.snapshot/snapshotname and not below it. I will add more details
to the design doc.
                
> 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
information.

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