[Hadoop-common-dev] Running up DataNode service in Master!

Regards,

I'm configuring my own HDFS:

etc/hosts

192.168.46.242 master.com
192.168.46.244 slave3.com


///MASTER MACHINE - master and slave...

1) masters

master.com

2) slaves

master.com
slave3.com

3) hadoop-site.xml

<property>
<name>fs.default.name</name>
<value>hdfs://master.com:9527</value>
</property>
...
<property>
<name>mapred.job.tracker</name>
<value>master.com:9528</value>
</property>
...
<property>
<name>dfs.replication</name>
<value>2</value>
</property>


///SLAVE MACHINE ... only slave
1) masters

---- EMPTY ---- (someone advice me!, it's truth?)

2) slaves

---- EMPTY ---- (and it?)

3) hadoop-site.xml

<property>
<name>fs.default.name</name>
<value>hdfs://slave3.com:9527</value>
</property>
...
<property>
<name>mapred.job.tracker</name>
<value>slave3.com:9528</value>
</property>
...
<property>
<name>dfs.replication</name>
<value>2</value>
</property>


THE PROBLEM...

In slave machine all services are on!
In master machine, DATANODE service apparently doesn't run up! but, all
service: namenode, secondarynode, jobtracker and tasktracker run up!

Thanks for ur help.