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