[Bugfix] [GT-537] Fix Replaced Member Zone during Replace operation

CHANGELOG.md

@@ -11,6 +11,7 @@
 - (Feature) License ArangoDeployment Fetcher
 - (Feature) K8S Resources Compare Generic
 - (Feature) Add support for CRD validation schemas
+- (Bugfix) Fix Replaced Member Zone during Replace operation
 
 ## [1.2.35](https://github.com/arangodb/kube-arangodb/tree/1.2.35) (2023-11-06)
 - (Maintenance) Update go-driver to v1.6.0, update IsNotFound() checks

pkg/apis/deployment/v1/topology_status.go

@@ -27,6 +27,20 @@ import (
 	"k8s.io/apimachinery/pkg/util/uuid"
 )
 
+type TopologyZoneFilter func(g ServerGroup, id string) bool
+
+func TopologyZoneFilterMerge(functions ...TopologyZoneFilter) TopologyZoneFilter {
+	return func(g ServerGroup, id string) bool {
+		for _, f := range functions {
+			if !f(g, id) {
+				return false
+			}
+		}
+
+		return true
+	}
+}
+
 type TopologyStatus struct {
 	ID types.UID `json:"id"`
 
@@ -53,25 +67,42 @@ func (t *TopologyStatus) Equal(b *TopologyStatus) bool {
 }
 
 func (t *TopologyStatus) GetLeastUsedZone(group ServerGroup) int {
+	return t.GetLeastUsedZoneWithFilter(group)
+}
+
+func (t *TopologyStatus) GetLeastUsedZoneWithFilter(group ServerGroup, filters ...TopologyZoneFilter) int {
 	if t == nil {
 		return -1
 	}
 
-	r, m := -1, math.MaxInt64
+	// If no zones are found
+	if len(t.Zones) == 0 {
+		return -1
+	}
 
-	for i, z := range t.Zones {
-		if n, ok := z.Members[group.AsRoleAbbreviated()]; ok {
-			if v := len(n); v < m {
-				r, m = i, v
-			}
-		} else {
-			if v := 0; v < m {
-				r, m = i, v
+	counts := make([]int, len(t.Zones))
+
+	for id, zone := range t.Zones {
+		c := 0
+
+		for _, member := range zone.Members[group.AsRoleAbbreviated()] {
+			if TopologyZoneFilterMerge(filters...)(group, member) {
+				c++
 			}
 		}
+
+		counts[id] = c
+	}
+
+	max := 0
+
+	for id := 1; id < len(counts); id++ {
+		if counts[id] < counts[max] {
+			max = id
+		}
 	}
 
-	return r
+	return max
 }
 
 func (t *TopologyStatus) RegisterTopologyLabel(zone int, label string) bool {

pkg/apis/deployment/v2alpha1/topology_status.go

@@ -27,6 +27,20 @@ import (
 	"k8s.io/apimachinery/pkg/util/uuid"
 )
 
+type TopologyZoneFilter func(g ServerGroup, id string) bool
+
+func TopologyZoneFilterMerge(functions ...TopologyZoneFilter) TopologyZoneFilter {
+	return func(g ServerGroup, id string) bool {
+		for _, f := range functions {
+			if !f(g, id) {
+				return false
+			}
+		}
+
+		return true
+	}
+}
+
 type TopologyStatus struct {
 	ID types.UID `json:"id"`
 
@@ -53,25 +67,42 @@ func (t *TopologyStatus) Equal(b *TopologyStatus) bool {
 }
 
 func (t *TopologyStatus) GetLeastUsedZone(group ServerGroup) int {
+	return t.GetLeastUsedZoneWithFilter(group)
+}
+
+func (t *TopologyStatus) GetLeastUsedZoneWithFilter(group ServerGroup, filters ...TopologyZoneFilter) int {
 	if t == nil {
 		return -1
 	}
 
-	r, m := -1, math.MaxInt64
+	// If no zones are found
+	if len(t.Zones) == 0 {
+		return -1
+	}
 
-	for i, z := range t.Zones {
-		if n, ok := z.Members[group.AsRoleAbbreviated()]; ok {
-			if v := len(n); v < m {
-				r, m = i, v
-			}
-		} else {
-			if v := 0; v < m {
-				r, m = i, v
+	counts := make([]int, len(t.Zones))
+
+	for id, zone := range t.Zones {
+		c := 0
+
+		for _, member := range zone.Members[group.AsRoleAbbreviated()] {
+			if TopologyZoneFilterMerge(filters...)(group, member) {
+				c++
 			}
 		}
+
+		counts[id] = c
+	}
+
+	max := 0
+
+	for id := 1; id < len(counts); id++ {
+		if counts[id] < counts[max] {
+			max = id
+		}
 	}
 
-	return r
+	return max
 }
 
 func (t *TopologyStatus) RegisterTopologyLabel(zone int, label string) bool {