Hadoop is a software platform that lets one easily write and run applications that process vast amounts of data.
This charm provides version 2.7.3 of the HDFS NameNode application from Apache Bigtop.
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 version 2.7.3 of the NameNode component from
This charm requires Juju 2.0 or greater. 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.
juju deploy 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
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.
Apache Bigtop charms provide extended status reporting to indicate when they
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.
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
Watch the progress of the smoke test actions with:
watch -n 2 juju show-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>
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:
Apache Bigtop tracks issues using JIRA (Apache account required). File an
issue for this charm at:
Ensure Bigtop is selected as the project. Typically, charm issues are filed
in the deployment component with the latest stable release selected as the
affected version. Any uncertain fields may be left blank.