Hi Srini,
do you solved your issue ?
I have the same issue and when I have it, it is linked with an error message in the Active (or Standby) NameNode
log (hadoop-hdfs-namenode-ServerXXXX.log) like :
"2017-12-23 07:47:01,761 INFO util.JvmPauseMonitor (JvmPauseMonitor.java:run(196)) - Detected pause in JVM or host machine (eg GC): pause of approximately 4572ms
No GCs detected"
Now, I need to understand which process causes the process load issue.
I hope it can help you.
Best Regards
Gérald