Multi Node Ozone Cluster

Multi-Node Ozone Cluster

Pre-requisites

Ensure you have password-less ssh setup between your hosts.

Configuration

ozone-site.xml

Save the following snippet to etc/hadoop/ozone-site.xml in the compiled Ozone distribution.

<configuration>
<properties>
<property><name>ozone.scm.block.client.address</name><value>SCM-HOSTNAME</value></property>
<property><name>ozone.scm.names</name><value>SCM-HOSTNAME</value></property>
<property><name>ozone.scm.client.address</name><value>SCM-HOSTNAME</value></property>
<property><name>ozone.om.address</name><value>OM-HOSTNAME</value></property>
<property><name>ozone.handler.type</name><value>distributed</value></property>
<property><name>ozone.enabled</name><value>True</value></property>
<property><name>ozone.scm.datanode.id</name><value>/tmp/ozone/data/datanode.id</value></property>
<property><name>ozone.replication</name><value>3</value></property>
<property><name>ozone.metadata.dirs</name><value>/tmp/ozone/data/metadata</value></property>
</properties>
</configuration>

Replace SCM-HOSTNAME and OM-HOSTNAME with the names of the machines where you want to start the SCM and OM services respectively. It is okay to start these services on the same host. If you are unsure then just use any machine from your cluster.

hadoop-env.sh

The only mandatory setting in hadoop-env.sh is JAVA_HOME. E.g.

# The java implementation to use. By default, this environment
# variable is REQUIRED on ALL platforms except OS X!
export JAVA_HOME=/usr/java/latest

workers

The workers file should contain a list of hostnames in your cluster where DataNode service will be started. E.g.

n001.example.com
n002.example.com
n003.example.com
n004.example.com

Start Services

Initialize the SCM

Run the following commands on the SCM host

bin/ozone scm --init
bin/ozone --daemon start scm

Format the OM

Run the following commands on the OM host

bin/ozone om --init
bin/ozone --daemon start om

Start DataNodes

Run the following command on any cluster host.

  su hdfs -c '/var/lib/hadoop-ozone/bin/ozone --config /etc/ozone/conf --daemon start datanode'

Stop Services

Run the following command on any cluster host.

su hdfs -c '/var/lib/hadoop-ozone/bin/ozone --config /etc/ozone/conf --daemon stop datanode'

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