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https://issues.apache.org/jira/browse/HDFS-2802?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13669528#comment-13669528
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Jing Zhao commented on HDFS-2802:
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Suresh, I keep running tests for snapshots these days. In general the tests run
well with more than 1.2 million files/directories in my testing cluster. But we
did find some issues which are mainly caused by taking snapshots directly on
root. I filed HDFS-4842, HDFS-4857, and HDF-4863 for fix. Also HDFS-4846,
HDFS-4848, and HDFS-4850 are filed by [~schu] for further improvement. I think
the branch-2 merge will be ready after these jiras are committed.
> 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: datanode, namenode
> Reporter: Hari Mankude
> Assignee: Tsz Wo (Nicholas), SZE
> Attachments: 2802.diff, 2802.patch, 2802.patch, h2802_20130417.patch,
> h2802_20130422.patch, h2802_20130423.patch, h2802_20130425.patch,
> h2802_20130426.patch, h2802_20130430b.patch, h2802_20130430.patch,
> h2802_20130508.patch, h2802_20130509.patch, HDFS-2802.20121101.patch,
> HDFS-2802.branch-2.0510.patch, HDFS-2802-meeting-minutes-121101.txt,
> HDFSSnapshotsDesign.pdf, snap.patch, snapshot-design.pdf,
> snapshot-design.tex, snapshot-one-pager.pdf, Snapshots20120429.pdf,
> Snapshots20121018.pdf, Snapshots20121030.pdf, Snapshots.pdf,
> snapshot-testplan.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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