Hadoop Slave

juju deploy hadoop-slave

16.04 LTS

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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 a combined slave node running version 2.7.3 of both the NodeManager and DataNode components from Apache Bigtop.

Deploying

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 3 units of this charm acting as the combined DataNode/NodeManager application. 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 as a datanode/nodemanager.

Smoke Test

This charm provides a smoke-test action that can be used to verify the application is functioning as expected. This action executes the 'hdfs' and 'mapreduce' smoke tests provided by Apache Bigtop and may take up to 30 minutes to complete. Run the action as follows:

juju run-action slave/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>

Scaling

To scale the cluster compute and storage capabilities, simply add more slave units. To add one unit:

juju add-unit slave

Multiple units may be added at once. For example, add four more slave units:

juju add-unit -n4 slave

Issues

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.

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