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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 16:17:16 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2802?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13489516#comment-13489516

Suresh Srinivas commented on HDFS-2802:

Konstantin, missed a few comments:
bq. Same with ls -r. I see Aaron proposes to skip .snapshot, which makes sense. Should we
have something like ls -rs to list snapshotable directories in the tree?
.snapshot is skipped when regular path is given. Let me go over some examples:
# <path> related operations that does not include .snapshot only operates on non snapshot
related files.
#* ls -r <path> - will only list non snapshot files
#* rm -r <path> - as already stated in the document, if there are snapshots under that
path, then deletion is not allowed, until all the snapshots are deleted.
# <path>/.snapshot applies to all the snapshots
#* ls <path>/.snapshot - lists all the snapshots under that path
#* ls -r <path>/.snapshot - I was thinking this would be same as ls <path>/.snapshot.
I was thinking recursively listing all the snapshots could be expensive and may 
not be what a user wants. I want to get your thoughts on that.
#* rm <path>/.snapshot or rm -r <path>/.snapshot - removes all the snapshots.
I want to get your thoughts on this as well.
# <path>/.snapshot/snapname
#* ls <path>/.snapshot/snapname - list files in the snapshot
#* ls -r <path>/.snapshot/snapname - recursively lists all the files in the snapshot
#* rm <path>/.snapshot/snapname or rm -r <path>/.snapshot/snapname - deletes the
#* rm <path>/.snapshot/snapname/file - fails. snapshot is read-only.

I will update the design document with these details.

> 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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