Hortonworks, spun out of Yahoo earlier this year to monetise the company’s Hadoop skills, tells Silicon Angle that “half the world’s data will be on Hadoop in 5 years.” Elsewhere, new research commissioned by Infineta concludes that big data “is expected to account for more than 50 percent of the world’s data” over the same period. Infineta, with its emphasis upon high-throughput WAN traffic between data centers, argues that competitors’ networking gear is simply not capable of handling the anticipated traffic in a timely and cost-effective fashion. But, even assuming that both Hortonworks and Infineta have got this 50% claim about right, how much of that data really has to travel back and forth between data centers in something approaching real-time? Some, for sure. But maybe not as much as the headline numbers want us to presume.