nfsv4-svc consuming highest 99% CPU in RHEL 5.8 64Bit

Guys,

We have a production machine where nfsv4-svc process consuming highest memory. Below output is for your reference.

top - 07:51:03 up 448 days, 20:33, 1 user, load average: 1.25, 1.21, 1.24
Tasks: 200 total, 2 running, 198 sleeping, 0 stopped, 0 zombie
Cpu(s): 10.1%us, 37.4%sy, 0.0%ni, 51.9%id, 0.1%wa, 0.0%hi, 0.4%si, 0.0%st
Mem: 8043460k total, 7984052k used, 59408k free, 566984k buffers
Swap: 10485752k total, 406744k used, 10079008k free, 2626456k cached

PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
5591 root 25 0 0 0 0 R 91.3 0.0 81125:16 nfsv4-svc
7131 jxadmin 18 0 4016m 1.8g 8488 S 1.5 23.8 404:08.82 java
27035 root 15 0 12760 1100 756 R 1.5 0.0 0:00.01 top
30371 jxadmin 19 0 1624m 450m 45m S 1.5 5.7 84:48.09 java

Could anyone out there had the same issue earlier, if yes then could you all please advise how to get this sorted. Many thanks!

Regards,
Amit Saha