protected boolean isValidName(final String name) {
      return !blacklist.contains(name);
    }
Create a filter on the givem filesystem with the specified blacklist
@param fs                     filesystem to filter
@param directoryNameBlackList list of the names of the directories to filter. If
                              <tt>null</tt>, all directories are returned
hbase-server/src/main/java/org/apache/hadoop/hbase/util/FSUtils.java