private static Method getMethod(String methodName, Class<?>... args) {
    try {
      Class<?> clazz = Class.forName(INTERNAL_UTILS_CLASS_NAME);
      return clazz.getDeclaredMethod(methodName, args);
    } catch (ClassNotFoundException | NoSuchMethodException e) {
      throw new AssertionError("should not happen", e);
    }
  }
A bridge class for operating on log4j, such as changing log level, etc.
<p/>
Will call the methods in {@link InternalLog4jUtils} to actually operate on the log4j stuff.
hbase-logging/src/main/java/org/apache/hadoop/hbase/logging/Log4jUtils.java