Changes needed for CDH4 HA - Quorum based

core-site.xml

<property>
  <name>fs.default.name/name>
  <value>hdfs://example-cluster</value>
</property>

hdfs-site.xml

<!-- common server name -->
<property>
  <name>dfs.nameservices</name>
  <value>example-cluster</value>
</property>

<!-- HA configuration -->
<property>
  <name>dfs.ha.namenodes.example-cluster</name>
  <value>nn1,nn2</value>
</property>
<property>
  <name>dfs.namenode.rpc-address.example-cluster.nn1</name>
  <value>master1:8020</value>
</property>
<property>
  <name>dfs.namenode.rpc-address.example-cluster.nn2</name>
  <value>master2:8020</value>
</property>
<property>
  <name>dfs.namenode.http-address.example-cluster.nn1</name>
  <value>0.0.0.0:50070</value>
</property>
<property>
  <name>dfs.namenode.http-address.example-cluster.nn2</name>
  <value>0.0.0.0:50070</value>
</property>

<!-- Storage for edits' files -->
<property>
  <name>dfs.namenode.shared.edits.dir</name>
  <value>qjournal://node1:8485;node2:8485;node3:8485/example-cluster</value>
</property>

<!-- Client failover -->
<property>
  <name>dfs.client.failover.proxy.provider.example-cluster</name>
  <value>org.apache.hadoop.hdfs.server.namenode.ha.ConfiguredFailoverProxyProvider</value>
</property>

<!-- Fencing configuration -->
<property>
  <name>dfs.ha.fencing.methods</name>
  <value>sshfence</value>
</property>
 <property>
  <name>dfs.ha.fencing.ssh.private-key-files</name>
  <value>/home/user/.ssh/id_dsa</value>
</property>


<!-- Automatic failover configuration -->
<property>
  <name>dfs.ha.automatic-failover.enabled</name>
  <value>true</value>
</property>
<property>
  <name>ha.zookeeper.quorum</name>
  <value>zk1:2181,zk2:2181,zk3:2181</value>
</property>