Add topologySpreadConstraints to worker deployment

Author: tadeha

charts/trino/README.md

@@ -712,6 +712,27 @@ Fast distributed SQL query engine for big data analytics that helps you explore
 * `worker.nodeSelector` - object, default: `{}`
 * `worker.tolerations` - list, default: `[]`
 * `worker.affinity` - object, default: `{}`
+* `worker.topologySpreadConstraints` - list, default: `[]`  
+
+  Configure [topology spread constraints](https://kubernetes.io/docs/concepts/scheduling-eviction/topology-spread-constraints/) to control how worker pods are spread across your cluster among failure-domains such as nodes, zones, and regions. This is a best practice for achieving high availability and preventing resource hotspots.
+  Example of spreading workers across hostnames and zones:
+  ```yaml
+  topologySpreadConstraints:
+    - maxSkew: 1
+      topologyKey: "kubernetes.io/hostname"
+      whenUnsatisfiable: "ScheduleAnyway"
+      labelSelector:
+        matchLabels:
+          app.kubernetes.io/name: trino
+          app.kubernetes.io/component: worker
+    - maxSkew: 1
+      topologyKey: "topology.kubernetes.io/zone"
+      whenUnsatisfiable: "DoNotSchedule"
+      labelSelector:
+        matchLabels:
+          app.kubernetes.io/name: trino
+          app.kubernetes.io/component: worker
+  ```
 * `worker.additionalConfigFiles` - object, default: `{}`  
 
   Additional config files placed in the default configuration directory. Supports templating the files' contents with `tpl`.

charts/trino/templates/deployment-worker.yaml

@@ -256,6 +256,10 @@ spec:
       nodeSelector:
         {{- toYaml . | nindent 8 }}
       {{- end }}
+      {{- with .Values.worker.topologySpreadConstraints }}
+      topologySpreadConstraints:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
       {{- with .Values.worker.affinity }}
       affinity:
         {{- toYaml . | nindent 8 }}

charts/trino/values.yaml

@@ -862,6 +862,33 @@ worker:
 
   affinity: {}
 
+  topologySpreadConstraints: []
+  # worker.topologySpreadConstraints -- Configure [topology spread
+  # constraints](https://kubernetes.io/docs/concepts/scheduling-eviction/topology-spread-constraints/)
+  # to control how worker pods are spread across your cluster among failure-domains
+  # such as nodes, zones, and regions. This is a best practice for achieving high
+  # availability and preventing resource hotspots.
+  #
+  # @raw
+  # Example of spreading workers across hostnames and zones:
+  # ```yaml
+  # topologySpreadConstraints:
+  #   - maxSkew: 1
+  #     topologyKey: "kubernetes.io/hostname"
+  #     whenUnsatisfiable: "ScheduleAnyway"
+  #     labelSelector:
+  #       matchLabels:
+  #         app.kubernetes.io/name: trino
+  #         app.kubernetes.io/component: worker
+  #   - maxSkew: 1
+  #     topologyKey: "topology.kubernetes.io/zone"
+  #     whenUnsatisfiable: "DoNotSchedule"
+  #     labelSelector:
+  #       matchLabels:
+  #         app.kubernetes.io/name: trino
+  #         app.kubernetes.io/component: worker
+  # ```
+
   additionalConfigFiles: {}
   # worker.additionalConfigFiles -- Additional config files placed in the default configuration directory.
   # Supports templating the files' contents with `tpl`.

tests/trino/test-values.yaml

@@ -137,6 +137,22 @@ worker:
   annotations:
     custom/name: value
 
+  topologySpreadConstraints:
+    - maxSkew: 1
+      topologyKey: "kubernetes.io/hostname"
+      whenUnsatisfiable: "ScheduleAnyway"
+      labelSelector:
+        matchLabels:
+          app.kubernetes.io/name: trino
+          app.kubernetes.io/component: worker
+    - maxSkew: 1
+      topologyKey: "topology.kubernetes.io/zone"
+      whenUnsatisfiable: "ScheduleAnyway"
+      labelSelector:
+        matchLabels:
+          app.kubernetes.io/name: trino
+          app.kubernetes.io/component: worker
+
 commonLabels:
   extra-label: extra-value