Hi all, I was working on hadoop-0.20.2 version, everything was going well, then I have upgraded hadoop-0.21.0 version and installed it. and tried to run all nodes, but it was failed. i have formated the namenode, and also upgraded by this command hdfs namenode -upgrade. but still its not working. then iam againg switichg to older version hadoop0.20.2 and trying to run all nodes and name nodes fails and shows this error. even i tried this command to rollback. hadoop namenode -rollback ERROR org.apache.hadoop.hdfs.server.namenode.FSNamesystem: FSNamesystem initialization failed. java.io.IOException: Unexpected version of the file system log file: -24. Current version = -18.
Please suggest Greetings Yogesh
