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https://issues.apache.org/jira/browse/HDFS-2802?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13480269#comment-13480269
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Tsz Wo (Nicholas), SZE commented on HDFS-2802:
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> In some of the most commercially popular systems which implement snapshots,
> snapshots do not count against the disk quotas. ...
Thanks for the comment. I think the systems you mentioned probably only
support RO snapshot. In the design, we also consider RW snapshot so that disk
quotas have to be counted. Your suggestion on two kinds of quotas could be a
good alternative.
> 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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