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https://issues.apache.org/jira/browse/HDFS-12873?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16273470#comment-16273470
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Raeanne J Marks commented on HDFS-12873:
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Oops, not very descriptive. I meant if you try to get the file status of a file
using a path containing {{..}} after the 4th index, but I was recalling
something different and was incorrect. Please disregard that comment.
What I mentioned about ignoring anything after the {{..}} in the 4th index is
true though. For example, {{'/.reserved/.inodes/<y's inode
number>/../I/don't/exist}} would return y's parent's inode number (x) - it just
throws away {{I/don't/exist}}.
> Creating a '..' directory is possible using inode paths
> -------------------------------------------------------
>
> Key: HDFS-12873
> URL: https://issues.apache.org/jira/browse/HDFS-12873
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: hdfs, namenode
> Affects Versions: 2.8.0
> Environment: Apache NameNode running in a Docker container on a
> Fedora 25 workstation.
> Reporter: Raeanne J Marks
>
> Start with a fresh deployment of HDFS.
> 1. Mkdirs '/x/y/z'
> 2. use GetFileInfo to get y's inode number
> 3. Mkdirs '/.reserved/.inodes/<y's inode number>/z/../foo'
> Expectation: The path in step 3 is rejected as invalid (exception thrown) OR
> foo would be created under y.
> Observation: This created a directory called '..' under z and 'foo' under
> that '..' directory instead of consolidating the path to '/x/y/foo' or
> throwing an exception. GetListing on '/.reserved/.inodes/<z's inode number>'
> shows '..', while GetListing on '/x/y' does not.
> Mkdirs INotify events were reported with the following paths, in order:
> /x
> /x/y
> /x/y/z
> /x/y/z/..
> /x/y/z/../foo
> I can also chain these dotdot directories and make them as deep as I want.
> Mkdirs works with the following paths appended to the inode path for
> directory y: '/z/../../../foo', '/z/../../../../../',
> '/z/../../../foo/bar/../..' etc, and it constructs all the '..' directories
> as if they weren't special names.
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