namenode, datanode not list by using jps

Question

Environment: ubuntu 14.04, hadoop 2.6

After I type the start-all.sh and jps, DataNode doesn\'t list on the terminal

Answer 1

For this you need to give permission to you hdfc folder. Then run below commands:

1. create a group by command: sudo adgroup hadoop
2. add ur user into this: sudo usermod -a -G hadoop "ur_user" ( u can see current user by Who command)
3. Now change the owner ship of this hadoop_store directly by: sudo chown -R "ur_user":"ur_gourp" /usr/local/hadoop_store
4. then format name node again by: hdfs namenode -format

and start all services you can see the result.....now type JPS (it will work).