new Configuration() always logs IOException in debug mode

[pi song]

Dear people in Hadoop mailing-list

Just out of curiosity. The Configuration class has a constructor which looks
like this:-

  /** A new configuration. */
  public Configuration() {
    if (LOG.isDebugEnabled()) {
      LOG.debug(StringUtils.stringifyException(new
IOException("config()")));
    }
    resources.add("hadoop-default.xml");
    resources.add("hadoop-site.xml");
  }

So, the IOException will always appear in my log file in debug mode. What is
the reason behind this?

Pi