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From "Colin Patrick McCabe (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-9417) Support for symlink resolution in LocalFileSystem / RawLocalFileSystem
Date Tue, 09 Jul 2013 00:23:49 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-9417?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13702679#comment-13702679

Colin Patrick McCabe commented on HADOOP-9417:

looks good overall.

+  private String readLink(Path p) {
+    /* NB: Use readSymbolicLink in java.nio.file.Path once available. Could
+     * use getCanonicalPath in File to get the target of the symlink but that
+     * does not indicate if the given path refers to a symlink.
+     */
+    try {
+      final String path = p.toUri().getPath();
+      return Shell.execCommand(Shell.READ_LINK_COMMAND, path).trim();
+    } catch (IOException x) {
+      return "";
+    }
+  }

Silent failure seems like a bad idea here.  We should at least be doing what we do in the
"FileNotFound" section of getFileLinkStatusInternal.  Currently you just pretend it isn't
a symlink at all when an error happens... seems wrong.

from FileSystemTestWrapper.java:
  public void mkdir(Path dir, FsPermission permission, boolean createParent)
      throws AccessControlException, FileAlreadyExistsException,
      FileNotFoundException, ParentNotDirectoryException,
      UnsupportedFileSystemException, IOException {
    // Note that there is no "mkdir" in FileSystem, it always does
    // "mkdir -p" (creating parent directories).
    fs.mkdirs(dir, permission);

Sorry, I guess I missed this in a previous review, but this should throw an exception if createParent
= false, no?

It bothers me that symlinks on the local filesystem can't link to other filesystems.  It seems
inconsistent that I can't link, to, say hdfs://foo/bar from file:///baz.  But I will open
another JIRA to discuss that.
> Support for symlink resolution in LocalFileSystem / RawLocalFileSystem
> ----------------------------------------------------------------------
>                 Key: HADOOP-9417
>                 URL: https://issues.apache.org/jira/browse/HADOOP-9417
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs
>    Affects Versions: 3.0.0
>            Reporter: Andrew Wang
>            Assignee: Andrew Wang
>         Attachments: hadoop-9417-1.patch, hadoop-9417-2.patch, hadoop-9417-3.patch, hadoop-9417-4.patch,
> Add symlink resolution support to LocalFileSystem/RawLocalFileSystem as well as tests.

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