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 Apache Bigtop.
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. For example:
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 bundle readme.
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 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.
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:
http://NAMENODE_PUBLIC_IP:50070
Apache Bigtop tracks issues using JIRA (Apache account required). File an issue for this charm at:
https://issues.apache.org/jira/secure/CreateIssue!default.jspa
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.