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https://issues.apache.org/jira/browse/HADOOP-9984?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13780411#comment-13780411
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Colin Patrick McCabe commented on HADOOP-9984:
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bq. Both listStatus and listLinkStatus must return file stats with the exact
same paths. Those paths must be constructed from the "unresolved" paths. The
only difference is whether the stat is for the symlink itself, or the stat of
the resolved path.
Here's an illustration. If you have inodes like this:
{code}
a symlink: /a -> /b
a directory: /b
a file: /b/c
{code}
You get:
{code}
getFileStatus("/a/b/c") returns FileStatus(path="/b/c", type:file)
getFileLinkStatus("/a/b/c") returns FileStatus(path="/b/c", type:file)
getFileStatus("/a") returns FileStatus(path="/b", type:dir)
getFileLinkStatus("/a") returns FileStatus(path="/a", type:symlink)
{code}
{{getFileStatus}} and {{listStatus}} have *always* resolved intermediate path
components. What we're discussing here is whether {{listStatus}} should
resolve the final path component, like {{getFileStatus}} does.
Basically, {{listLinkStatus}} is *exactly* like {{getFileLinkStatus}}, but for
directory listing.
> FileSystem#globStatus and FileSystem#listStatus should resolve symlinks by
> default
> ----------------------------------------------------------------------------------
>
> Key: HADOOP-9984
> URL: https://issues.apache.org/jira/browse/HADOOP-9984
> Project: Hadoop Common
> Issue Type: Bug
> Components: fs
> Affects Versions: 2.1.0-beta
> Reporter: Colin Patrick McCabe
> Assignee: Colin Patrick McCabe
> Priority: Blocker
> Attachments: HADOOP-9984.001.patch, HADOOP-9984.003.patch,
> HADOOP-9984.005.patch
>
>
> During the process of adding symlink support to FileSystem, we realized that
> many existing HDFS clients would be broken by listStatus and globStatus
> returning symlinks. One example is applications that assume that
> !FileStatus#isFile implies that the inode is a directory. As we discussed in
> HADOOP-9972 and HADOOP-9912, we should default these APIs to returning
> resolved paths.
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