code: public static int computeDefaultMaxParallelism(int operatorParallelism) {
  
  		checkParallelismPreconditions(operatorParallelism);
  
  		return Math.min(
  				Math.max(
  						MathUtils.roundUpToPowerOfTwo(operatorParallelism + (operatorParallelism / 2)),
  						DEFAULT_LOWER_BOUND_MAX_PARALLELISM),
  				UPPER_BOUND_MAX_PARALLELISM);
  	}
docs: Computes a default maximum parallelism from the operator parallelism. This is used in case the user has not
  explicitly configured a maximum parallelism to still allow a certain degree of scale-up.
  
  @param operatorParallelism the operator parallelism as basis for computation.
  @return the computed default maximum parallelism.