HBase chart

A chart to deploy Hbase with Hadoop using Kubernetes. Heavily inspired by the Hadoop chart.

How-to contribute

This chart was developed without former k8s experience, please help us improve the chart by contributing to it!

You need:

helm install --name myzk incubator/zookeeper --set servers=1,heap="1G"
helm del --purge hbase;helm install . --name hbase

This chart is using several functionalities from Kubernetes.

ConfigMap: at first, it is used as key-value to store elements. Here, we are using it to store config files. Furthermore, we are using it to inject a boostrap.sh to start our container.
- For every container, we are mouting a container in /tmp based on the content of the ConfigMap (one entry == one file).
- Entrypoint for every component is the bash called bootstrap.sh, which is hold by the ConfigMap.
- bootstrap.sh is copying the files in the ConfigMap to the right location, starting the daemon and tail the logs
Headless Service: In Kubernetes, every request to a pod a loadbalanced through a proxy by default. But Hbase is directly trying to connect to the RS, so by enabling headless mode, we can directly access the RS container.
StatefulSet: it is used to deploy stateful applications to Kubernetes.
PodDisruptionBudget: Allow user to define policy on pod failure.
PersistentVolumClaim: allows pod to have volumes for data. Used for HDFS.

There's a YAML per role and per functionality. Binding is done through Selectors.