You can do the following method, copy to clipboard datanode clusterID for your example, CID-8bf63244-0510-4db6-a949-8f74b50f2be9 and run following command under HADOOP_HOME/bin directory then this code formatted the namenode with datanode cluster ids. OR ou must do as follow : bin/ rm -Rf /home/prassanna/usr/local/hadoop/yarn_data/hdfs/* bin/hadoop namenode -format I had the same… Continue Reading Datanode not starts correctly