DataNode failing to Start in Hadoop

Question

I trying setup Hadoop install on Ubuntu 11.04 and Java 6 sun. I was working with hadoop 0.20.203 rc1 build. I am repeatedly running into an issue on Ubuntu 11.04 with java-6

Answer 1

Yes I formatted the namenode , the problem was in of the rogue templates for hdfs-site.xml that i copy pasted , the dfs.data.dir and dfs.name.dir pointed to the same directory location resulting Locked storage error. They should be different directories. Unfortunately, the hadoop documentation is not clear enough in this subtle details.