True, but you can have more nodes with modern 'traditional' databases, replicate your data and add redundancy. Hadoop and other big data tools should be used be

True, but you can have more nodes with modern 'traditional' databases, replicate your data and add redundancy. Hadoop and other big data tools should be used because we have a huge amount of data, not to add redundancy or resiliency. The characteristic you listed were well know way before 'big data' became a thing.