question How can i start Namenode service of Hadoop without formating it every time want to start it ? in Support Questions

question How can i start Namenode service of Hadoop without formating it every time want to start it ? in Support Questions https://community.cloudera.com/t5/Support-Questions/How-can-i-start-Namenode-service-of-Hadoop-without-formating/m-p/239524#M201333 When i want to start Namenode of Hadoop i'm forced to format it or i'll got the error connection to localhost:9000, so for this reason i will lose all my data storaged in HDFS after formating the Namenode. Because the dir of namenode and datanode were in tmp folder which will be cleaned after every reboot the machine, So how i can resolve this problem in order to start the Namenode service without formating to keep my data on HDFS ? Fri, 28 Dec 2018 07:25:34 GMT slimani_ibr 2018-12-28T07:25:34Z