Affects Version/s: None
Fix Version/s: None
Test scenarios :
1) Put a healthy slave task tracker in the dfs.exclude file.
2) As a valid user, decommission a node in the cluster by issuing the command "hadoop mradmin -refreshNodes"
3) Make sure that the node is decommissioned.
4) Now take the task tracker out of the file.
5) As a valid user, again issue the command "hadoop mradmin -refreshNodes"
6) Make sure that the node is not in the decommiossion list.
7) Bring back that node.