You suspect that your NameNode is incorrectly configured, and is swapping memory to disk.
Which Linux commands help you to identify whether swapping is occurring?
A.
free
B.
df
C.
memcat
D.
top
E.
jps
F.
vmstat
G.
swapinfo
Explanation:
http://www.cyberciti.biz/faq/linux-check-swap-usage-command/