public void sleepUntilNextRetry() throws InterruptedException {
    int attempts = getAttemptTimes();
    long sleepTime = getBackoffTime();
    LOG.trace("Sleeping {} ms before retry #{}...", sleepTime, attempts);
    retryConfig.getTimeUnit().sleep(sleepTime);
    useRetry();
  }
Sleep for a back off time as supplied by the backoff policy, and increases the attempts
hbase-common/src/main/java/org/apache/hadoop/hbase/util/RetryCounter.java