no namenode error in pseudo-mode

Question

I\'m new to hadoop and is in learning phase. As per Hadoop Definitve guide, i have set up my hadoop in pseudo distributed mode and everything was working fine. I was even able t

Answer 1

I have the similar problem, but slightly different.

Running start-all.sh seams quite well, but jps shows that there is no namenodes and I could not see the list when I run hdfs dfs -ls /.

My first attempt is to run hadoop namenode -format, then namenode appears but datanode disappears.

After googling the solution, I run rm -rf /usr/local/hadoop_store/hdfs/datanode/* and restart hadoop, jps shows:

    12912 ResourceManager  
    13391 FsShell  
    13420 Jps  
    13038 NodeManager  
    12733 SecondaryNameNode  
    12432 NameNode  
    12556 DataNode  

Now I can use hadoop commands as usual.

HTH!

Answer 2

I had similar issue and this helped

chown -R hdfs:hadoop /path/to/namenode/date/dir