Hello,
I want to do some test on my single node cluster for Speed. I know it is easy to set up the Pseudo-Distributed Mode, and Hadoop will start one Java process for each single map/reduce. My question is: is it parallel enough on multi-core CPU? I mean if I have 4 mappers at the same time while my CPU have 4 cores, will the 4 mappers be running on different cores at the same time? I know another way to simulate a Hadoop cluster with one machine is to use virtual machine software such as VMware to simulate multiple machines and set up a cluster upon these virtual machines. What's the difference between the two methods for SPEED and PARALLEL on multi-core structure? Thanks, Xuzhan
