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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, 29 Oct 2012 01:53:12 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2802?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13485779#comment-13485779

Suresh Srinivas commented on HDFS-2802:

Aaron, I have not looked at your design. Will do so when I get a chance.

bq. Efficient of snapshot and materialization of snapshots
Many of the things you are repeating again, about space and creation efficiency etc. I have
addressed them in many comments. Please do not comment as if the current work is not considering
it. Our solutions will be based on well known solution in the literature for this problem.
Please see on HDFS-4125.

Some of the differences around administrative can be made configurable, if need be. These
are surround aspect of the feature.

Given repeated feedback about optimizations we are working on updating the implementation
and design. Earlier the goal was to get the inefficient but correct first implementation with
tests and have design review, followed by optimization. Given the feedback so far, we will
post updated design next week. Possibly hold a design review in around two weeks.

BTW if this design/implementation needs changes later we can have a discussion. At this point
in time, I would like to focus on getting parts of the implementation we have had in our prototype
out in this branch. I am fine if we need to throw away parts of it.
> 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-one-pager.pdf, Snapshots20121018.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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