The document discusses virtualizing Hadoop and provides details on:
1) Current and projected usage of Hadoop shows a trend toward more virtualized deployments on-premises and in the public cloud.
2) Different virtualization platform scenarios for Hadoop including using shared storage, storage appliances, or local disks. Common virtualization platforms that can be used are VMware vSphere and OpenStack.
3) Example virtualization architectures showing how Hadoop could be deployed with shared NAS storage or using direct-attached storage on each virtual machine.