Hostnames and DNS
Every node in Aster Database must have access to all Hadoop nodes.
First, find out how the network is configured for Hadoop. This will determine whether the
network setup between Aster and Hadoop is public or private.
1 To find out how the Hadoop cluster is configured, look in the Hadoop configuration files
in /etc/hadoop/conf on the master node.
2 Make a note of all the hostnames in the files in that directory.
3 Ping each hostname from the Hadoop master node to determine the IP address of each
Hadoop node. Make a note of these.
4 See if these IP addresses are reachable from the Aster cluster by pinging from one of the
# ping <hadoop_master_node_IP>
• If the ping is successful, then the Aster cluster and the Hadoop cluster are on the same
network. This is known as a "private" setup.
• If the Aster node cannot reach the IP address on the Hadoop cluster, but there is
another public IP address configured on Hadoop which Aster node can reach, then you
need a "public" setup.
5 Set up Host/DNS entries for Hadoop on all Aster Database nodes through the , as
described in “Configure Hosts” on page 543AMC the. The entries you must make depend
on whether your setup is public or private:
• If public, add a Host entry for each Hadoop node (Hive server, Hadoop namenode and
all Hadoop datanodes).
• If private, add a Host entry for the Hive server and the Hadoop namenode.