Hadoop datanode services is not starting in the slaves in hadoop

Question

I am trying to configure hadoop-1.0.3 multinode cluster with one master and two slave in my laptop using vmware workstation.

when I ran the start-all.sh from master all daemon process running in master node (namenode,datanode,tasktracker,jobtracker,secondarynamenode) but Datanode and tasktracker is not starting on slave node. Password less ssh is enabled and I can do ssh for both master and slave from my masternode without pwd.

Please help me resolve this.

Answer 1

Stop the cluster.

If you have specifically defined tmp directory location in core-site.xml, then remove all files under those directory.

If you have specifically defined data node and namenode directory in hdfs-site.xml, then delete all the files under those directories.

If you have not defined anything in core-site.xml or hdfs-site.xml, then please remove all the files under /tmp/hadoop-*nameofyourhadoopuser.

Format the namenode.

It should work!