NFS not working on some nodes

NFS not working

The nodes were not working and issuing the command
showed that there was an NFS mounting problem
jimp@compute-2:~$ rpcinfo -p
program vers proto port
100000 2 tcp 111 portmapper
100000 2 udp 111 portmapper
100024 1 udp 52121 status
100024 1 tcp 59769 status

The /etc/hosts file was changed to match the other nodes
the rpcinfo command now gives the following.

jimp@compute-5:~$ rpcinfo -p hadoop
program vers proto port
100000 2 tcp 111 portmapper
100000 2 udp 111 portmapper
100024 1 udp 56797 status
100024 1 tcp 54606 status
100021 1 udp 53628 nlockmgr
100021 3 udp 53628 nlockmgr
100021 4 udp 53628 nlockmgr
100021 1 tcp 53694 nlockmgr
100021 3 tcp 53694 nlockmgr
100021 4 tcp 53694 nlockmgr
100003 2 udp 2049 nfs
100003 3 udp 2049 nfs
100003 4 udp 2049 nfs
100003 2 tcp 2049 nfs
100003 3 tcp 2049 nfs
100003 4 tcp 2049 nfs
100005 1 udp 40126 mountd
100005 1 tcp 37582 mountd
100005 2 udp 40126 mountd
100005 2 tcp 37582 mountd
100005 3 udp 40126 mountd
100005 3 tcp 37582 mountd