[incubator/cassandra] Fix chart not being upgradable by removing mutable label from volumeClaimTemplate (#12402)

* [incubator/cassandra] rename backup.image.repository, update default value, add support for google credentials as a secret

Signed-off-by: Simon Hardy <sha@taktik.com>

* [incubator/cassandra] cleanup

Signed-off-by: Simon Hardy <sha@taktik.com>

* [incubator/cassandra] comment

Signed-off-by: Simon Hardy <sha@taktik.com>

* [incubator/cassandra] Fix chart not being upgradable by removing mutable label from VolumeClaimTemplate

Signed-off-by: Simon Hardy <sha@taktik.com>

* [incubator/cassandra] Update readme regarding chart not being upgradable

Signed-off-by: Simon Hardy <sha@taktik.com>

* [incubator/cassandra] readme small update

Signed-off-by: Simon Hardy <sha@taktik.com>

* [incubator/cassandra] remove heritage from volumeClaimTemplates labels

Signed-off-by: Simon Hardy <sha@taktik.com>

incubator/cassandra/Chart.yaml

@@ -1,5 +1,5 @@
 name: cassandra
-version: 0.11.1
+version: 0.12.0
 appVersion: 3.11.3
 description: Apache Cassandra is a free and open-source distributed database management
   system designed to handle large amounts of data across many commodity servers, providing

incubator/cassandra/README.md

@@ -19,6 +19,24 @@ If you want to delete your Chart, use this command
 helm delete  --purge "cassandra"
 ```
 
+## Upgrading
+
+To upgrade your Cassandra release, simply run
+
+```bash
+helm upgrade "cassandra" incubator/cassandra
+```
+
+### 0.12.0
+
+This version fixes https://github.com/helm/charts/issues/7803 by removing mutable labels in `spec.VolumeClaimTemplate.metadata.labels` so that it is upgradable.
+
+Until this version, in order to upgrade, you have to delete the Cassandra StatefulSet before upgrading: 
+```bash
+$ kubectl delete statefulset --cascade=false my-cassandra-release
+```
+
+
 ## Persist data
 You need to create `StorageClass` before able to persist data in persistent volume.
 To create a `StorageClass` on Google Cloud, run the following

incubator/cassandra/templates/statefulset.yaml

@@ -183,9 +183,7 @@ spec:
       name: data
       labels:
         app: {{ template "cassandra.name" . }}
-        chart: {{ template "cassandra.chart" . }}
         release: {{ .Release.Name }}
-        heritage: {{ .Release.Service }}
     spec:
       accessModes:
         - {{ .Values.persistence.accessMode | quote }}