code: public static RetryPolicy getDefault()
  	{
  		return new RetryExponential(
  				ClientConstants.DEFAULT_RERTRY_MIN_BACKOFF, 
  				ClientConstants.DEFAULT_RERTRY_MAX_BACKOFF, 
  				ClientConstants.DEFAULT_MAX_RETRY_COUNT,
  				ClientConstants.DEFAULT_RETRY);
  	}
docs: Retry policy that provides exponentially increasing retry intervals with each successive failure. This policy is suitable for use by use most client applications and is also the default policy
  if no retry policy is specified.
  @return a retry policy that provides exponentially increasing retry intervals