Restarting NameNode in Hadoop Cluster without format -

due reasons had shut down master node in cluster, if start cluster again namenode wont run unless format again, solution start name-node without formatting... tried everything.. start-all.sh or starting namenode/datanodes individually namenode wont start untill format again, how can start name-node without formatting.

thanks in advance

please post log information.

in fact, needn't format when restart hadoop. because hdfs meta information storage in disk, if format namenode, meta information lost.

you can try whether there namenode process still exist when stop cluster, use commond ps -e|grep java. if yes, kill , start namenode again.