[jira] [Created] (HADOOP-9819) FileSystem#rename is broken, deletes target when renaming link to itself

["Arpit Agarwal (JIRA)" <ji...@apache.org>]

Arpit Agarwal created HADOOP-9819:
-------------------------------------

             Summary: FileSystem#rename is broken, deletes target when renaming link to itself
                 Key: HADOOP-9819
                 URL: https://issues.apache.org/jira/browse/HADOOP-9819
             Project: Hadoop Common
          Issue Type: Bug
          Components: fs
    Affects Versions: 3.0.0
            Reporter: Arpit Agarwal


Uncovered while fixing TestSymlinkLocalFsFileSystem on Windows.

This block of code deletes the symlink, the correct behavior is to do nothing.

{code:java}
    try {
      dstStatus = getFileLinkStatus(dst);
    } catch (IOException e) {
      dstStatus = null;
    }
    if (dstStatus != null) {
      if (srcStatus.isDirectory() != dstStatus.isDirectory()) {
        throw new IOException("Source " + src + " Destination " + dst
            + " both should be either file or directory");
      }
      if (!overwrite) {
        throw new FileAlreadyExistsException("rename destination " + dst
            + " already exists.");
      }
      // Delete the destination that is a file or an empty directory
      if (dstStatus.isDirectory()) {
        FileStatus[] list = listStatus(dst);
        if (list != null && list.length != 0) {
          throw new IOException(
              "rename cannot overwrite non empty destination directory " + dst);
        }
      }
      delete(dst, false);
{code}

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