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https://issues.apache.org/jira/browse/HDFS-4111?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13485763#comment-13485763
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Tsz Wo (Nicholas), SZE commented on HDFS-4111:
----------------------------------------------
Just have finished some code to verify this.
- Original tree
{noformat}
(INodeDirectoryWithQuota)
\- TestSnapshot (INodeDirectory)
\- sub1 (INodeDirectorySnapshottable)
+- file1 (INodeFile)
+- file2 (INodeFile)
+- sub11 (INodeDirectory)
\- file3 (INodeFile)
\- z_file4 (INodeFile)
0 snapshot of sub1
{noformat}
- Take a snapshot of /TestSnapshot/sub1
{noformat}
(INodeDirectoryWithQuota)
\- TestSnapshot (INodeDirectory)
\- sub1 (INodeDirectorySnapshottable)
+- file1 (INodeFileWithLink)
+- file2 (INodeFileWithLink)
+- sub11 (INodeDirectory)
\- file3 (INodeFileWithLink)
\- z_file4 (INodeFileWithLink)
1 snapshot of sub1
\- s1 (INodeDirectorySnapshotRoot)
+- file1 (INodeFileSnapshot)
+- file2 (INodeFileSnapshot)
+- sub11 (INodeDirectory)
\- file3 (INodeFileSnapshot)
\- z_file4 (INodeFileSnapshot)
{noformat}
- Create a new file /TestSnapshot/sub1/z_file5
{noformat}
(INodeDirectoryWithQuota)
\- TestSnapshot (INodeDirectory)
\- sub1 (INodeDirectorySnapshottable)
+- file1 (INodeFileWithLink)
+- file2 (INodeFileWithLink)
+- sub11 (INodeDirectory)
\- file3 (INodeFileWithLink)
z_file4 (INodeFileWithLink)
\- z_file5 (INodeFile)
1 snapshot of sub1
\- s1 (INodeDirectorySnapshotRoot)
+- file1 (INodeFileSnapshot)
+- file2 (INodeFileSnapshot)
+- sub11 (INodeDirectory)
\- file3 (INodeFileSnapshot)
\- z_file4 (INodeFileSnapshot)
{noformat}
- Take another snapshot of /TestSnapshot/sub1
{noformat}
(INodeDirectoryWithQuota)
\- TestSnapshot (INodeDirectory)
\- sub1 (INodeDirectorySnapshottable)
+- file1 (INodeFileWithLink)
+- file2 (INodeFileWithLink)
+- sub11 (INodeDirectory)
\- file3 (INodeFileWithLink)
z_file4 (INodeFileWithLink)
\- z_file5 (INodeFileWithLink)
2 snapshots of sub1
+- s1 (INodeDirectorySnapshotRoot)
+- file1 (INodeFileSnapshot)
+- file2 (INodeFileSnapshot)
+- sub11 (INodeDirectory)
\- file3 (INodeFileSnapshot)
\- z_file4 (INodeFileSnapshot)
\- s2 (INodeDirectorySnapshotRoot)
+- file1 (INodeFileSnapshot)
+- file2 (INodeFileSnapshot)
+- sub11 (INodeDirectory)
\- file3 (INodeFileSnapshot)
z_file4 (INodeFileSnapshot)
\- z_file5 (INodeFileSnapshot)
{noformat}
> 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
> Fix For: Snapshot (HDFS-2802)
>
> Attachments: h4111_20121025.patch, h4111_20121026.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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