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https://issues.apache.org/jira/browse/HDFS-2802?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13480772#comment-13480772
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Suresh Srinivas commented on HDFS-2802:
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bq. In fact I think the design is based my comment on HDFS-3960
Actually we have been mulling over some of these ideas for a long time.
HDFS-3960 was just started to get the discussion going.
The design we are proposing is to let DNs send the length. The length known is
what goes into the snapshot instead of recording either zero length for block
under construction or having to initiate communication with
datanodes/implicitly getting it from DN. From what I have heard from some HBase
folks 5-10 seconds lagging should be workable for them. That is why I want to
to talk to few HBase folks in the design review.
> 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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