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https://issues.apache.org/jira/browse/HDFS-2802?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13480836#comment-13480836
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Colin Patrick McCabe commented on HDFS-2802:
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Suresh said:
bq. How do [other filesystems] handle disk quota use when the original file is
deleted and only snapshots exists? That is the reason why counting the disk
quota makes sense.
ZFS has "quotas" and "refquotas". The former includes snapshot overhead; the
latter does not. Based on some Googling, I think that on NetApp devices,
quotas do not include snapshot overhead. (at least by default). I think it
makes sense to offer both kinds of quota, although we don't have to implement
them both right away, of course.
> 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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