private static boolean deleteRegionWithoutArchiving(FileSystem fs, Path regionDir)
    throws IOException {
    if (fs.delete(regionDir, true)) {
      LOG.debug("Deleted {}", regionDir);
      return true;
    }
    LOG.debug("Failed to delete directory {}", regionDir);
    return false;
  }
Without regard for backup, delete a region. Should be used with caution.
@param regionDir {@link Path} to the region to be deleted.
@param fs        FileSystem from which to delete the region
@return <tt>true</tt> on successful deletion, <tt>false</tt> otherwise
@throws IOException on filesystem operation failure
hbase-server/src/main/java/org/apache/hadoop/hbase/backup/HFileArchiver.java