FeatherCast

This presentation will describe the initial experience building and using CassKop, an operator developed for running Cassandra on top of Kubernetes. CassKop works as a usual K8S controller (reconcile the real state with a desired state) and automates the Cassandra operations through JMX. All the operations are launched by calling standard K8S APIs (kubectl apply …) or by using a K8S plugin (kubectl casskop …). CassKop is developed in GO, based on CoreOS operator-sdk framework.nAmong the main features :n- deploying a rack aware cluster (or AZ aware cluster)n- scaling up & down (including cleanups)n- setting and modifying configuration parameters (C* and JVM parameters)n- adding / removing a datacenter in Cassandran- rebuilding nodesn- removing node or replacing node (in case of hardware failure)n- upgrading C* or Java versions (including upgradesstables)n- monitoring (using Prometheus/Grafana)n- … By using local and persistent volumes, it is possible to handle failures or stop/start nodes for maintenance operations with no transfer of data between nodes. Moreover, cassandra-reaper is deployed in K8S and used for scheduling repair sessions (Thanks to Spotify and TheLastPickle teams)nThe Cassandra exporter for Prometheus and backup/restore developed by Instaclustr are also used (Thanks to Instaclustr team) During this session, we will delve into the architecture and implementation of this operator, and share our learnings.