HBase is the Hadoop database. Think of it as a distributed, scalable Big Data store.
Use HBase when you need random, realtime read/write access to your Big Data. This project's goal is the hosting of very large tables -- billions of rows X millions of columns -- atop clusters of commodity hardware. Learn more at hbase.apache.org.
This charm deploys version 1.1.9 of the HBase master, regionserver, and thrift components 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.
An HBase deployment consists of HBase Masters and HBase RegionServers. In a distributed HBase environment, one master and one regionserver are deployed on each unit. HBase ensures that only one master is active with the rest in standby mode in case the active master fails.
Because HBase requires HDFS, this charm is recommended to be deployed as part of the hadoop-hbase bundle:
juju deploy hadoop-hbase
This will deploy an Apache Bigtop Hadoop cluster with 3 HBase units colocated on 3 Hadoop DataNodes. More information about this deployment can be found in the bundle readme.
This charm also supports the Thrift client API for HBase. Thrift is both cross-platform and more lightweight than REST for many operations.
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.
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 hbase/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>
The HBase Master service provides a web console that can be used to verify information about the cluster. To access it, find the PUBLIC-ADDRESS of any hbase unit and expose the application:
juju status hbase juju expose hbase
The HBase Master web interface will be available at the following URL:
http://HBASE_PUBLIC_IP:16010
The HBase RegionServer and Thrift services also provide web interfaces that are accessible at the following URLs:
http://HBASE_PUBLIC_IP:16030 http://HBASE_PUBLIC_IP:9095
Once HBase is ready, there are a number of actions available in this charm.
Run a performance test (as described in the Benchmarking section):
juju run-action hbase/0 perf-test juju show-action-output <id> # <-- id from above command
Run a smoke test (as described in the Verifying section):
juju run-action hbase/0 smoke-test juju show-action-output <id> # <-- id from above command
Start/Stop/Restart all HBase services on a unit:
juju run-action hbase/0 [start|stop|restart] juju show-action-output <id> # <-- id from above command
Start/Stop the HBase Master service on a unit:
juju run-action hbase/0 [start|stop]-hbase-master juju show-action-output <id> # <-- id from above command
Start/Stop the HBase RegionServer and Thrift services on a unit:
juju run-action hbase/0 [start|stop]-hbase-regionserver juju show-action-output <id> # <-- id from above command
HBase includes a shell that can be used to interact with the cluster. Access it from any hbase unit (e.g. hbase/0) as follows:
$ juju ssh hbase/0 $ hbase shell HBase Shell; enter 'help<RETURN>' for list of supported commands. Type "exit<RETURN>" to leave the HBase Shell Version 1.1.3, rUnknown, Wed Mar 29 07:39:44 UTC 2017 hbase(main):002:0> exit
Charm configuration can be changed at runtime with juju config. This charm supports the following config parameters.
The default heap size for the the HBase master JVM is 1024MB. Set a different value (in MB) with the following:
juju config hbase heap=4096
This charm provides a perf-test action to gauge the performance of the HBase cluster:
$ juju run-action hbase/0 perf-test
Action queued with id: 339cec1f-e903-4ee7-85ca-876fb0c3d28e
$ juju show-action-output 339cec1f-e903-4ee7-85ca-876fb0c3d28e
results:
meta:
composite:
direction: asc
units: secs
value: "90"
raw: /opt/hbase-perf-results/1495562300.log
start: 2017-05-23T17:58:20Z
stop: 2017-05-23T17:59:50Z
outcome: success
status: completed
timing:
completed: 2017-05-23 17:59:51 +0000 UTC
enqueued: 2017-05-23 17:58:16 +0000 UTC
started: 2017-05-23 17:58:20 +0000 UTC
Restarting an HBase cluster is potentially disruptive. Be aware that the following events will cause a restart of all HBase services:
juju configApache 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.