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 facilitates communication between Hadoop components of an Apache Bigtop cluster and workload applications.
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 a client unit preconfigured to work with the cluster. 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 hdfs and/or yarn.
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 plugin/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 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 plugin "su hdfs -c 'hdfs dfsadmin -report'"
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.