feat: Enable restarter-controller for history and connect server StatefulSets

CHANGELOG.md

@@ -4,6 +4,12 @@ All notable changes to this project will be documented in this file.
 
 ## [Unreleased]
 
+### Added
+
+- The history server and Spark Connect server StatefulSets now carry the
+  `restarter.stackable.tech/enabled: "true"` label, opting them into the restarter-controller so
+  that their Pods are automatically rolled when a mounted ConfigMap or Secret changes ([#754]).
+
 ### Changed
 
 - Internal operator refactoring: introduce a build() step in the history and connect
@@ -51,6 +57,7 @@ All notable changes to this project will be documented in this file.
 [#746]: https://github.com/stackabletech/spark-k8s-operator/pull/746
 [#750]: https://github.com/stackabletech/spark-k8s-operator/pull/750
 [#753]: https://github.com/stackabletech/spark-k8s-operator/pull/753
+[#754]: https://github.com/stackabletech/spark-k8s-operator/pull/754
 
 ## [26.7.0] - 2026-07-21
 

rust/operator-binary/src/connect/controller/build/server.rs

@@ -16,6 +16,7 @@ use stackable_operator::{
             },
         },
     },
+    constants::RESTART_CONTROLLER_ENABLED_LABEL,
     crd::listener,
     k8s_openapi::{
         DeepMerge,
@@ -332,6 +333,9 @@ pub(crate) fn build_stateful_set(
             object_name(&validated.name_any(), SparkConnectRole::Server),
             SparkConnectRole::Server,
         )
+        // Opt into the restarter-controller: it rolls the StatefulSet's Pods when a mounted
+        // ConfigMap or Secret changes. See stackabletech/issues#816.
+        .with_label(RESTART_CONTROLLER_ENABLED_LABEL.to_owned())
         .build(),
         spec: Some(StatefulSetSpec {
             template: pod_template,

rust/operator-binary/src/history/controller/build/resource/statefulset.rs

@@ -7,6 +7,7 @@ use stackable_operator::{
         pod::{PodBuilder, security::PodSecurityContextBuilder, volume::VolumeBuilder},
     },
     constant,
+    constants::RESTART_CONTROLLER_ENABLED_LABEL,
     k8s_openapi::{
         DeepMerge,
         api::apps::v1::{StatefulSet, StatefulSetSpec},
@@ -247,6 +248,9 @@ pub(crate) fn build_stateful_set(
         resource_names.stateful_set_name().to_string(),
         role_group_name,
     )
+    // Opt into the restarter-controller: it rolls the StatefulSet's Pods when a mounted
+    // ConfigMap or Secret changes. See stackabletech/issues#816.
+    .with_label(RESTART_CONTROLLER_ENABLED_LABEL.to_owned())
     .build();
 
     Ok(StatefulSet {

tests/templates/kuttl/spark-connect-kerberos/12-assert.yaml

@@ -7,11 +7,14 @@ apiVersion: apps/v1
 kind: StatefulSet
 metadata:
   name: spark-connect-server
+  # generation stays at 1: the restarter-controller label must not itself trigger a rollout.
+  generation: 1
   labels:
     app.kubernetes.io/component: server
     app.kubernetes.io/instance: spark-connect
     app.kubernetes.io/managed-by: spark.stackable.tech_connect
     app.kubernetes.io/name: spark-connect
+    restarter.stackable.tech/enabled: "true"
     stackable.tech/vendor: Stackable
   ownerReferences:
     - apiVersion: spark.stackable.tech/v1alpha1

tests/templates/kuttl/spark-connect/12-assert.yaml

@@ -7,11 +7,14 @@ apiVersion: apps/v1
 kind: StatefulSet
 metadata:
   name: spark-connect-server
+  # generation stays at 1: the restarter-controller label must not itself trigger a rollout.
+  generation: 1
   labels:
     app.kubernetes.io/component: server
     app.kubernetes.io/instance: spark-connect
     app.kubernetes.io/managed-by: spark.stackable.tech_connect
     app.kubernetes.io/name: spark-connect
+    restarter.stackable.tech/enabled: "true"
     stackable.tech/vendor: Stackable
   ownerReferences:
     - apiVersion: spark.stackable.tech/v1alpha1

tests/templates/kuttl/spark-history-server/06-assert.yaml

@@ -7,6 +7,10 @@ apiVersion: apps/v1
 kind: StatefulSet
 metadata:
   name: spark-history-node-default
+  # generation stays at 1: the restarter-controller label must not itself trigger a rollout.
+  generation: 1
+  labels:
+    restarter.stackable.tech/enabled: "true"
 status:
   readyReplicas: 1
 ---