public static RetryPolicy fixedBackoffPolicy(int maxAttempts, int waitTimeMs) {
    return new FixedBackoffPolicy(maxAttempts, waitTimeMs);
  }
@param maxAttempts The maximum attempts.
@param waitTimeMs The wait time in milliseconds, wait time will not change with time.
@return a fixed-backoff retry policy with the provided parameters.
ambry-commons/src/main/java/com/github/ambry/commons/RetryPolicies.java