[wip] Stateful sets

[jkremser]

Changing what operator actually deploys. Replication controllers are considered as a low-lvl detail k8s resources and don't allow for durable data (one can't assign the persistent volume to a certain replica managed by RC).

This changes replication controllers to stateful sets, it's wip, because the volumeClaimTemplates are still not there.

Description

after applying the example/cluster.yaml:

λ oc get rc
No resources found.

λ oc get statefulsets
NAME                 READY   AGE
my-spark-cluster-m   1/1     3m6s
my-spark-cluster-w   2/2     3m6s

✨ New feature (non-breaking change which adds functionality)

[todo]

transform the replication controllers into stateful sets if the PV is asked

spark-operator/src/main/java/io/radanalytics/operator/cluster/KubernetesSparkClusterDeployer.java

Lines 212 to 217 in fc2d038

	// // TODO: transform the replication controllers into stateful sets if the PV is asked
	// List<Volume> volumes = getVolumes(cluster, isMaster);
	// if (volumes != null) {
	// rcBuilder.withVolumes(volumes);
	// }

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This comment was generated by todo based on a TODO comment in fc2d038 in #262. cc @radanalyticsio.