Data Node not started in slave machine

[Dhaya007 <mg...@gmail.com>]

I am new to hadoop if any think wrong please correct me .... 
I Have configured a single/multi node cluster using following link 
http://www.michael-noll.com/wiki/Running_Hadoop_On_Ubuntu_Linux_%28Single-Node_Cluster%29. 
I have followed the link but i am not able to start the haoop in multi node
environment 
The problems i am facing are as Follows:
1.I have configured master and slave nodes with ssh less pharase if try to
run the start-dfs.sh it prompt the password for master:slave machines.(I
have copied the .ssh/id_rsa.pub key of master in to slaves autherized_key
file) 

2.After giving password datanode,namenode,jobtracker,tasktraker started
successfully in master but datanode is started in slave. 


3.Some time step 2 works and some time it says that permission denied. 

4.I have checked the log file in the slave for datanode it says that
incompatible node, then i have formated the slave, master and start the dfs
by start-dfs.sh still i am getting the error 


The host entry in etc/hosts are both master/slave
master 
slave 
conf/masters
master 
conf/slaves
master 
slave 

The hadoop-site.xml  for both master/slave 
<?xml version="1.0"?> 
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?> 

<!-- Put site-specific property overrides in this file. --> 

<configuration> 
<property> 
  <name>hadoop.tmp.dir</name> 
  <value>/home/hdusr/hadoop-${user.name}</value> 
  <description>A base for other temporary directories.</description> 
</property> 
  
<property> 
  <name>fs.default.name</name> 
  <value>hdfs://master:54310</value> 
  <description>The name of the default file system.  A URI whose 
  scheme and authority determine the FileSystem implementation.  The 
  uri's scheme determines the config property (fs.SCHEME.impl) naming 
  the FileSystem implementation class.  The uri's authority is used to 
  determine the host, port, etc. for a filesystem.</description> 
</property> 
  
<property> 
  <name>mapred.job.tracker</name> 
  <value>master:54311</value> 
  <description>The host and port that the MapReduce job tracker runs 
  at.  If "local", then jobs are run in-process as a single map 
  and reduce task. 
  </description> 
</property> 
  
<property> 
  <name>dfs.replication</name> 
  <value>2</value> 
  <description>Default block replication. 
  The actual number of replications can be specified when the file is
created. 
  The default is used if replication is not specified in create time. 
  </description> 
</property> 

<property> 
  <name>mapred.map.tasks</name> 
  <value>20</value> 
  <description>As a rule of thumb, use 10x the number of slaves (i.e.,
number of tasktrackers). 
  </description> 
</property> 

<property> 
  <name>mapred.reduce.tasks</name> 
  <value>4</value> 
  <description>As a rule of thumb, use 2x the number of slave processors
(i.e., number of tasktrackers). 
  </description> 
</property> 
</configuration> 

Please help me to reslove the same. Or else provide any other tutorial for
multi node cluster setup.I am egarly waiting for the tutorials. 


Thanks 

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