Configurable Tolerations and TopologySpreadConstraints. Fixes infinis…

…pan#1803 and infinispan#1844

api/v1/infinispan_types.go

@@ -470,6 +470,10 @@ type SchedulingSpec struct {
 	Affinity *corev1.Affinity `json:"affinity,omitempty"`
 	// +optional
 	PriorityClassName string `json:"PriorityClassName,omitempty"`
+	// +optional
+	Tolerations []corev1.Toleration `json:"tolerations,omitempty"`
+	// +optional
+	TopologySpreadConstraints []corev1.TopologySpreadConstraint `json:"topologySpreadConstraints,omitempty"`
 }
 
 // InfinispanSpec defines the desired state of Infinispan

api/v1/types_util.go

@@ -964,6 +964,14 @@ func (ispn *Infinispan) PriorityClassName() string {
 	return ""
 }
 
+func (ispn *Infinispan) Tolerations() []corev1.Toleration {
+	return ispn.Spec.Scheduling.Tolerations
+}
+
+func (ispn *Infinispan) TopologySpreadConstraints() []corev1.TopologySpreadConstraint {
+	return ispn.Spec.Scheduling.TopologySpreadConstraints
+}
+
 func (c *ContainerProbeSpec) AssignDefaults(failureThreshold, initialDelay, period, successThreshold, timeout int32) {
 	if c.FailureThreshold == nil {
 		c.FailureThreshold = pointer.Int32(failureThreshold)

config/crd/bases/infinispan.org_infinispans.yaml

@@ -1905,6 +1905,184 @@ spec:
                             type: array
                         type: object
                     type: object
+                  tolerations:
+                    items:
+                      description: The pod this Toleration is attached to tolerates
+                        any taint that matches the triple <key,value,effect> using
+                        the matching operator <operator>.
+                      properties:
+                        effect:
+                          description: Effect indicates the taint effect to match.
+                            Empty means match all taint effects. When specified, allowed
+                            values are NoSchedule, PreferNoSchedule and NoExecute.
+                          type: string
+                        key:
+                          description: Key is the taint key that the toleration applies
+                            to. Empty means match all taint keys. If the key is empty,
+                            operator must be Exists; this combination means to match
+                            all values and all keys.
+                          type: string
+                        operator:
+                          description: Operator represents a key's relationship to
+                            the value. Valid operators are Exists and Equal. Defaults
+                            to Equal. Exists is equivalent to wildcard for value,
+                            so that a pod can tolerate all taints of a particular
+                            category.
+                          type: string
+                        tolerationSeconds:
+                          description: TolerationSeconds represents the period of
+                            time the toleration (which must be of effect NoExecute,
+                            otherwise this field is ignored) tolerates the taint.
+                            By default, it is not set, which means tolerate the taint
+                            forever (do not evict). Zero and negative values will
+                            be treated as 0 (evict immediately) by the system.
+                          format: int64
+                          type: integer
+                        value:
+                          description: Value is the taint value the toleration matches
+                            to. If the operator is Exists, the value should be empty,
+                            otherwise just a regular string.
+                          type: string
+                      type: object
+                    type: array
+                  topologySpreadConstraints:
+                    items:
+                      description: TopologySpreadConstraint specifies how to spread
+                        matching pods among the given topology.
+                      properties:
+                        labelSelector:
+                          description: LabelSelector is used to find matching pods.
+                            Pods that match this label selector are counted to determine
+                            the number of pods in their corresponding topology domain.
+                          properties:
+                            matchExpressions:
+                              description: matchExpressions is a list of label selector
+                                requirements. The requirements are ANDed.
+                              items:
+                                description: A label selector requirement is a selector
+                                  that contains values, a key, and an operator that
+                                  relates the key and values.
+                                properties:
+                                  key:
+                                    description: key is the label key that the selector
+                                      applies to.
+                                    type: string
+                                  operator:
+                                    description: operator represents a key's relationship
+                                      to a set of values. Valid operators are In,
+                                      NotIn, Exists and DoesNotExist.
+                                    type: string
+                                  values:
+                                    description: values is an array of string values.
+                                      If the operator is In or NotIn, the values array
+                                      must be non-empty. If the operator is Exists
+                                      or DoesNotExist, the values array must be empty.
+                                      This array is replaced during a strategic merge
+                                      patch.
+                                    items:
+                                      type: string
+                                    type: array
+                                required:
+                                - key
+                                - operator
+                                type: object
+                              type: array
+                            matchLabels:
+                              additionalProperties:
+                                type: string
+                              description: matchLabels is a map of {key,value} pairs.
+                                A single {key,value} in the matchLabels map is equivalent
+                                to an element of matchExpressions, whose key field
+                                is "key", the operator is "In", and the values array
+                                contains only "value". The requirements are ANDed.
+                              type: object
+                          type: object
+                          x-kubernetes-map-type: atomic
+                        maxSkew:
+                          description: 'MaxSkew describes the degree to which pods
+                            may be unevenly distributed. When `whenUnsatisfiable=DoNotSchedule`,
+                            it is the maximum permitted difference between the number
+                            of matching pods in the target topology and the global
+                            minimum. The global minimum is the minimum number of matching
+                            pods in an eligible domain or zero if the number of eligible
+                            domains is less than MinDomains. For example, in a 3-zone
+                            cluster, MaxSkew is set to 1, and pods with the same labelSelector
+                            spread as 2/2/1: In this case, the global minimum is 1.
+                            | zone1 | zone2 | zone3 | |  P P  |  P P  |   P   | -
+                            if MaxSkew is 1, incoming pod can only be scheduled to
+                            zone3 to become 2/2/2; scheduling it onto zone1(zone2)
+                            would make the ActualSkew(3-1) on zone1(zone2) violate
+                            MaxSkew(1). - if MaxSkew is 2, incoming pod can be scheduled
+                            onto any zone. When `whenUnsatisfiable=ScheduleAnyway`,
+                            it is used to give higher precedence to topologies that
+                            satisfy it. It''s a required field. Default value is 1
+                            and 0 is not allowed.'
+                          format: int32
+                          type: integer
+                        minDomains:
+                          description: "MinDomains indicates a minimum number of eligible
+                            domains. When the number of eligible domains with matching
+                            topology keys is less than minDomains, Pod Topology Spread
+                            treats \"global minimum\" as 0, and then the calculation
+                            of Skew is performed. And when the number of eligible
+                            domains with matching topology keys equals or greater
+                            than minDomains, this value has no effect on scheduling.
+                            As a result, when the number of eligible domains is less
+                            than minDomains, scheduler won't schedule more than maxSkew
+                            Pods to those domains. If value is nil, the constraint
+                            behaves as if MinDomains is equal to 1. Valid values are
+                            integers greater than 0. When value is not nil, WhenUnsatisfiable
+                            must be DoNotSchedule. \n For example, in a 3-zone cluster,
+                            MaxSkew is set to 2, MinDomains is set to 5 and pods with
+                            the same labelSelector spread as 2/2/2: | zone1 | zone2
+                            | zone3 | |  P P  |  P P  |  P P  | The number of domains
+                            is less than 5(MinDomains), so \"global minimum\" is treated
+                            as 0. In this situation, new pod with the same labelSelector
+                            cannot be scheduled, because computed skew will be 3(3
+                            - 0) if new Pod is scheduled to any of the three zones,
+                            it will violate MaxSkew. \n This is an alpha field and
+                            requires enabling MinDomainsInPodTopologySpread feature
+                            gate."
+                          format: int32
+                          type: integer
+                        topologyKey:
+                          description: TopologyKey is the key of node labels. Nodes
+                            that have a label with this key and identical values are
+                            considered to be in the same topology. We consider each
+                            <key, value> as a "bucket", and try to put balanced number
+                            of pods into each bucket. We define a domain as a particular
+                            instance of a topology. Also, we define an eligible domain
+                            as a domain whose nodes match the node selector. e.g.
+                            If TopologyKey is "kubernetes.io/hostname", each Node
+                            is a domain of that topology. And, if TopologyKey is "topology.kubernetes.io/zone",
+                            each zone is a domain of that topology. It's a required
+                            field.
+                          type: string
+                        whenUnsatisfiable:
+                          description: 'WhenUnsatisfiable indicates how to deal with
+                            a pod if it doesn''t satisfy the spread constraint. -
+                            DoNotSchedule (default) tells the scheduler not to schedule
+                            it. - ScheduleAnyway tells the scheduler to schedule the
+                            pod in any location, but giving higher precedence to topologies
+                            that would help reduce the skew. A constraint is considered
+                            "Unsatisfiable" for an incoming pod if and only if every
+                            possible node assignment for that pod would violate "MaxSkew"
+                            on some topology. For example, in a 3-zone cluster, MaxSkew
+                            is set to 1, and pods with the same labelSelector spread
+                            as 3/1/1: | zone1 | zone2 | zone3 | | P P P |   P   |   P   |
+                            If WhenUnsatisfiable is set to DoNotSchedule, incoming
+                            pod can only be scheduled to zone2(zone3) to become 3/2/1(3/1/2)
+                            as ActualSkew(2-1) on zone2(zone3) satisfies MaxSkew(1).
+                            In other words, the cluster can still be imbalanced, but
+                            scheduler won''t make it *more* imbalanced. It''s a required
+                            field.'
+                          type: string
+                      required:
+                      - maxSkew
+                      - topologyKey
+                      - whenUnsatisfiable
+                      type: object
+                    type: array
                 type: object
               security:
                 description: InfinispanSecurity info for the user application connection

pkg/reconcile/pipeline/infinispan/handler/manage/statefulset_updates.go

@@ -117,6 +117,16 @@ func StatefulSetRollingUpgrade(i *ispnv1.Infinispan, ctx pipeline.Context) {
 		updateNeeded = true
 	}
 
+	if !reflect.DeepEqual(spec.Tolerations, i.Tolerations()) {
+		spec.Tolerations = i.Tolerations()
+		updateNeeded = true
+	}
+
+	if !reflect.DeepEqual(spec.TopologySpreadConstraints, i.TopologySpreadConstraints()) {
+		spec.TopologySpreadConstraints = i.TopologySpreadConstraints()
+		updateNeeded = true
+	}
+
 	if spec.PriorityClassName != i.PriorityClassName() {
 		spec.PriorityClassName = i.PriorityClassName()
 		updateNeeded = true

pkg/reconcile/pipeline/infinispan/handler/provision/statefulsets.go

@@ -105,7 +105,9 @@ func ClusterStatefulSetSpec(statefulSetName string, i *ispnv1.Infinispan, ctx pi
 					Annotations: annotationsForPod,
 				},
 				Spec: corev1.PodSpec{
-					Affinity: i.Affinity(),
+					Affinity:                  i.Affinity(),
+					Tolerations:               i.Tolerations(),
+					TopologySpreadConstraints: i.TopologySpreadConstraints(),
 					Containers: []corev1.Container{{
 						Image:          i.ImageName(),
 						Args:           BuildServerContainerArgs(ctx.ConfigFiles()),