Solving the issue of Namenode not starting during Single Node Hadoop installation

On firing jps command, if you see that name node is not running during single node hadoop installation , then here are the steps to get Name Node running

Problem: namenode not getting started

Solution: - Please follow the following steps

STEP 1: stop hadoop

hduser@skillmentorz-virtualbox : $ /usr/local/hadoop/sbin/stop-dfs.sh

STEP 2: remove tmp folder

hduser@skillmentorz-virtualbox :$ sudo rm -rf /app/hadoop/tmp/

STEP 3:  create /app/hadoop/tmp/

hduser@skillmentorz-virtualbox : $ sudo mkdir -p /app/hadoop/tmp

hduser@skillmentorz-virtualbox : $ sudo chown hduser:hadoop /app/hadoop/tmp

hduser@skillmentorz-virtualbox : $ sudo chmod 750 /app/hadoop/tmp

STEP 4:  format namenode

hduser@skillmentorz-virtualbox : $ hdfs namenode -format

STEP 5 : start dfs

hduser@skillmentorz-virtualbox : $ /usr/local/hadoop/sbin/start-dfs.sh

STEP 6:  check jps

hduser@skillmentorz-virtualbox : $ jps

You will find all the daemons including Namenode running properly

Namenode

Secondary Namenode

Resource Manager

Data node

Node Manager

Thank you for your time.