Log reason for not reducing parallelism

    int desiredTaskParallelism = 
        (int)(
            (expectedTotalSourceTasksOutputSize+desiredTaskInputDataSize-1)/
            desiredTaskInputDataSize);
    if(desiredTaskParallelism < minTaskParallelism) {
      desiredTaskParallelism = minTaskParallelism;
    }
    
    if(desiredTaskParallelism >= currentParallelism) {
      return true;
    }
    
    // most shufflers will be assigned this range
    basePartitionRange = currentParallelism/desiredTaskParallelism;
    
    if (basePartitionRange <= 1) {
      // nothing to do if range is equal 1 partition. shuffler does it by default
      return true;
    }