public static void sleep(Configuration conf, long time) {
    try {
      Thread.sleep((long) (getWaitForRatio(conf) * time));
    } catch (InterruptedException ex) {
      LOG.warn(MessageFormat.format("Sleep interrupted, {0}", ex.toString()));
    }
  }
Makes the current thread sleep for the duration equal to the specified time in milliseconds
multiplied by the {@link #getWaitForRatio(Configuration)}.
@param conf the configuration
@param time the number of milliseconds to sleep.
hbase-common/src/test/java/org/apache/hadoop/hbase/Waiter.java