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https://issues.apache.org/jira/browse/HDFS-2802?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13480562#comment-13480562
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Suresh Srinivas commented on HDFS-2802:
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bq. My concern is that we're going about this wrong if the plan is to implement
a O(# of files + # of directories) solution and then optimize this via
multi-threading, offloading to disk, etc., as the design document suggests.
May be the design document is fairly early and might have misled you. That is
not the goal. The goal is to have efficient implementation. Will post and
updated design to address your concerns.
> 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: 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 information.
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