Hadoop is a software platform that lets one easily write and run applications that process vast amounts of data.
This charm provides the HDFS master node (NameNode).

Overview

The Apache Hadoop software library is a framework that allows for the
distributed processing of large data sets across clusters of computers
using a simple programming model.

This charm deploys the NameNode component of the Apache Bigtop platform
to provide HDFS master resources.

Deploying

A working Juju installation is assumed to be present. If Juju is not yet set
up, please follow the getting-started instructions prior to deploying this
charm.

This charm is intended to be deployed via one of the apache bigtop bundles.
For example:

juju deploy hadoop-processing

Note: The above assumes Juju 2.0 or greater. If using an earlier version
of Juju, use juju-quickstart with the following syntax: juju quickstart hadoop-processing.

This will deploy an Apache Bigtop cluster with this charm acting as the
NameNode. More information about this deployment can be found in the
bundle readme.

Network-Restricted Environments

Charms can be deployed in environments with limited network access. To deploy
in this environment, configure a Juju model with appropriate proxy and/or
mirror options. See Configuring Models for more information.

Verifying

Status

Apache Bigtop charms provide extended status reporting to indicate when they
are ready:

juju status

This is particularly useful when combined with watch to track the on-going
progress of the deployment:

watch -n 2 juju status

The message column will provide information about a given unit's state.
This charm is ready for use once the status message indicates that it is
ready with datanodes.

Smoke Test

This charm provides a smoke-test action that can be used to verify the
application is functioning as expected. Run the action as follows:

juju run-action namenode/0 smoke-test

Note: The above assumes Juju 2.0 or greater. If using an earlier version
of Juju, the syntax is juju action do namenode/0 smoke-test.

Watch the progress of the smoke test actions with:

watch -n 2 juju show-action-status

Note: The above assumes Juju 2.0 or greater. If using an earlier version
of Juju, the syntax is juju action status.

Eventually, the action should settle to status: completed. If it
reports status: failed, the application is not working as expected. Get
more information about a specific smoke test with:

juju show-action-output <action-id>

Note: The above assumes Juju 2.0 or greater. If using an earlier version
of Juju, the syntax is juju action fetch <action-id>.

Utilities

This charm includes Hadoop command line and web utilities that can be used
to verify information about the cluster.

Show the dfsadmin report on the command line with the following:

juju run --application namenode "su hdfs -c 'hdfs dfsadmin -report'"

To access the HDFS web console, find the PUBLIC-ADDRESS of the
namenode application and expose it:

juju status namenode
juju expose namenode

The web interface will be available at the following URL:

    http://NAMENODE_PUBLIC_IP:50070

Contact Information

Resources