You want a node to only swap Hadoop daemon data from RAM to disk when absolutely
necessary. What should you do?
A.
Set vm.swappiness to o in /etc/sysctl.conf
B.
Delete the /dev/vmswap file on the node
C.
Set the ram.swap parameter to o in core-site.xml
D.
Delete the /swapfile file on the node
E.
Delete the /etc/swap file on the node