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https://issues.apache.org/jira/browse/HDFS-2802?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13481906#comment-13481906
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Tsz Wo (Nicholas), SZE commented on HDFS-2802:
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{quote}
> I don't think that a solution which copies all of the files/directories
> that are being snapshotted should be merged to trunk.
I disagree. But we may just end up doing optimization prior to merge.
{quote}
I understand that O(1) snapshot creation is desirable but I don't think it is a
requirement. Currently, the snapshot feature is missing in HDFS. Having
snapshot with O(N) snapshot creation already opens the door of opportunity to
many applications. Only the applications requiring O(1) snapshot creation
should wait for the improvement but not everyone has to wait for 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: 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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