Hadoop: datanode not starting on slave - hadoop

Question

I have two VMs setup with Ubuntu 12.04. I am trying to setup Hadoop multinode, but after executing hadoop/sbin/start-dfs.shI see following process on my master:
20612 DataNode
20404 NameNode
20889 SecondaryNameNode
21372 Jps
However, there is nothing in the slave. Also when I do hdfs dfsadmin -report, I only see:
Live datanodes (1):
Name: 10.222.208.221:9866 (master)
Hostname: master
I checked logs, my start-dfs.sh does not even try to start datanode on my slave.
I am using following configuration:
#/etc/hosts
127.0.0.1 localhost
10.222.208.221 master
10.222.208.68 slave-1
changed hostanme in /etc/hostname in respective systems
Also, I am able to ping slave-1 from master system and vice-versa using ping.
/hadoop/etc/hadoop/core-site.xml
<configuration>
<property>
<name>fs.defaultFS</name>
<value>hdfs://master:9000</value>
</property>
</configuration>
#hadoop/etc/hdfs-site.xml
<configuration>
<property>
<name>dfs.namenode.name.dir</name>
<value>file:///hadoop/data/namenode</value>
<description>NameNode directory</description>
</property>
<property>
<name>dfs.datanode.data.dir</name>
<value>file:///hadoop/data/datanode</value>
<description>DataNode directory</description>
</property>
<property>
<name>dfs.replication</name>
<value>3</value>
</property>
</configuration>
/hadoop/etc/hadoop/mapred-site.xml
<configuration>
<property>
<name>mapred.job.tracker</name>
<value>master:9001</value>
</property>
</configuration>
I have also added master and slave-1 in /hadoop/etc/master and /hadoop/etc/slaveson both my master and slave system.
I have also tried cleaning data/* and then hdfs namenode -format before start-dfs.sh, still the problem persists.
Also, I have Network adapter setting marked as Bridged adapter.
Any possible reason datanode not starting on slave?

Answer 1

Can't claim to have the answer, but I found this "start-all.sh" and "start-dfs.sh" from master node do not start the slave node services?
Changed my slaves file to workers file and everything clicked in.

Answer 2

It seems you are using hadoop-2.x.x or above, so, try this configuration. And by default masters file( hadoop-2.x.x/etc/hadoop/masters) won't available on hadoop-2.x.x onwards.
hadoop-2.x.x/etc/hadoop/core-site.xml:
<configuration>
<property>
<name>fs.default.name</name>
<value>hdfs://master:9000</value>
</property>
</configuration>
~/etc/hadoop/hdfs-site.xml:
<configuration>
<property>
<name>dfs.namenode.name.dir</name>
<value>file:///hadoop/data/namenode</value>
<description>NameNode directory</description>
</property>
<property>
<name>dfs.datanode.data.dir</name>
<value>file:///hadoop/data/datanode</value>
<description>DataNode directory</description>
</property>
<property>
<name>dfs.replication</name>
<value>2</value>
</property>
</configuration>
~/etc/hadoop/mapred-site.xml:
<property>
<name>mapreduce.framework.name</name>
<value>yarn</value>
</property>
~/etc/hadoop/yarn-site.xml:
<property>
<name>yarn.resourcemanager.hostname</name>
<value>master</value>
</property>
<property>
<name>yarn.nodemanager.aux-services</name>
<value>mapreduce_shuffle</value>
</property>
<property>
<name>yarn.nodemanager.aux-services.mapreduce.shuffle.class</name>
<value>org.apache.hadoop.mapred.ShuffleHandler</value>
</property>
~/etc/hadoop/slaves
slave-1
copy all the above configured file from master and replace it on slave on this path hadoop-2.x.x/etc/hadoop/.