hi Pavan,

Looks like your are re-executing the "format" commands again. Namenode needs to be formatted only once. If you want to do it , remove the location " /var/lib/hadoop-0.20/cache/hadoop/dfs/name/current" and execute "format" option.

Thanks

hi pavan ,

1 case is discussed above ,if it dosent work check with jps, your namenode might not be working.You can check the namenodes.out.log and rectify the exception there, or just stop all the process and start again.