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.
Hadoop is designed to scale from a few servers to thousands of machines, each offering local computation and storage. Rather than rely on hardware to deliver high-availability, Hadoop can detect and handle failures at the application layer. This provides a highly-available service on top of a cluster of machines, each of which may be prone to failure.
Apache Flume is a distributed, reliable, and highly available service for collecting, aggregating, and moving large amounts of log data. It has a simple and flexible architecture based on streaming data flows. Learn more at flume.apache.org.
Apache Zeppelin is a web-based notebook that enables interactive data analytics. It allows for beautiful data-driven, interactive, and collaborative documents with SQL, Scala and more. Learn more at zeppelin.apache.org.
This bundle provides a complete deployment of Hadoop and Zeppelin components from Apache Bigtop. By leveraging these components along with Rsyslog and Flume, this bundle provides a robust environment for analysing syslog events.
The applications that comprise this bundle are spread across 6 units as follows:
- NameNode v2.7.3
- ResourceManager v2.7.3
- Colocated on the NameNode unit
- Slave (DataNode and NodeManager) v2.7.3
- 3 separate units
- Client (Hadoop endpoint)
- Plugin (Facilitates communication with the Hadoop cluster)
- Colocated on the Client unit
- Zeppelin v0.7.2
- Colocated on the Client unit
- Flume-HDFS v1.6.0
- Colocated on the Client unit
- Flume-Syslog v1.6.0
Syslog events generated on the Client unit are forwarded to the
apache-flume-syslog charm. These events are serialized and sent to the
apache-flume-hdfs charm to be stored in HDFS. A sample web notebook
is included to analyze these events using the Zeppelin spark interpreter.
Deploying this bundle results in a fully configured Apache Bigtop cluster on any supported cloud, which can be scaled to meet workload demands.
This bundle requires Juju 2.0 or greater. If Juju is not yet set up, please follow the getting-started instructions prior to deploying this bundle.
Note: This bundle requires hardware resources that may exceed limits of Free-tier or Trial accounts on some clouds. To deploy to these environments, modify a local copy of bundle.yaml to set
services: 'X': num_units: 1andmachines: 'X': constraints: mem=3Gas needed to satisfy account limits.
Deploy this bundle from the Juju charm store with the juju deploy command:
juju deploy realtime-syslog-analytics
Alternatively, deploy a locally modified bundle.yaml with:
juju deploy /path/to/bundle.yaml
The charms in this bundle can also be built from their source layers in the Bigtop charm repository. See the Bigtop charm README for instructions on building and deploying these charms locally.
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 Working offline for more information.
The applications that make up this bundle provide status messages 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 for each unit will provide information about that unit's state. Once they all indicate that they are ready, perform application smoke tests to verify that the bundle is working as expected.
The charms for each core component (namenode, resourcemanager, slave, and
zeppelin) provide a smoke-test action that can be used to verify the
application is functioning as expected. Note that the 'slave' component runs
extensive tests provided by Apache Bigtop and may take up to 30 minutes to
complete. Run the smoke-test actions as follows:
juju run-action namenode/0 smoke-test
juju run-action resourcemanager/0 smoke-test
juju run-action slave/0 smoke-test
juju run-action zeppelin/0 smoke-test
Watch the progress of the smoke test actions with:
watch -n 2 juju show-action-status
Eventually, all of the actions should settle to status: completed. If
any report status: failed, that application is not working as expected. Get
more information about a specific smoke test with:
juju show-action-output <action-id>
Applications in this bundle include command line and web utilities that can be used to verify information about the cluster.
From the command line, show the HDFS dfsadmin report and view the current list of YARN NodeManager units with the following:
juju run --application namenode "su hdfs -c 'hdfs dfsadmin -report'"
juju run --application resourcemanager "su yarn -c 'yarn node -list'"
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
To access the Resource Manager web consoles, find the Public address of the
resourcemanager application and expose it:
juju status resourcemanager
juju expose resourcemanager
The YARN and Job History web interfaces will be available at the following URLs:
http://RESOURCEMANAGER_PUBLIC_IP:8088
http://RESOURCEMANAGER_PUBLIC_IP:19888
To access the Zeppelin web console, find the Public address of the
zeppelin application and expose it:
juju status zeppelin
juju expose zeppelin
The Zeppelin web interface will be available at the following URL:
http://ZEPPELIN_PUBLIC_IP:9080
By default, three Hadoop slave units are deployed with this bundle. Scaling this application is as simple as adding more 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
File an issue for this bundle at:
https://github.com/juju-solutions/bundle-realtime-syslog-analytics/issues
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