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https://issues.apache.org/jira/browse/HDFS-4111?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13485015#comment-13485015
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Suresh Srinivas commented on HDFS-4111:
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Todd, you might not have had time to catchup with the comment. For convenience,
the goal is not O(n) - see
[here|https://issues.apache.org/jira/browse/HDFS-2802?focusedCommentId=13481069&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13481069],
[here|https://issues.apache.org/jira/browse/HDFS-2802?focusedCommentId=13481758&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13481758]
and
[here|https://issues.apache.org/jira/browse/HDFS-2802?focusedCommentId=13481853&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13481853]
Hopefully we start getting the tests in place now with inefficient/but simple
snapshot mechanism. This will help validate the functionality as we make
optimizations to the current code for time and space efficiency. Hopefully that
turns the the right orientation :-)
> Support snapshot of subtrees
> ----------------------------
>
> Key: HDFS-4111
> URL: https://issues.apache.org/jira/browse/HDFS-4111
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: name-node
> Reporter: Tsz Wo (Nicholas), SZE
> Assignee: Tsz Wo (Nicholas), SZE
> Labels: needs-test
> Attachments: h4111_20121025.patch
>
>
> HDFS-4076 add the ability to take snapshot of single files. In this JIRA, we
> add the ability to take snapshot of subtree trees in the namesystem.
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