@Override
    public long getBackoffTime(RetryConfig config, int attempts) {
      long backoffTime = super.getBackoffTime(config, attempts);
      return config.getMaxSleepTime() > 0
        ? Math.min(backoffTime, config.getMaxSleepTime())
        : backoffTime;
    }
Policy for calculating sleeping intervals between retry attempts
hbase-common/src/main/java/org/apache/hadoop/hbase/util/RetryCounter.java