fix random pod spread

Signed-off-by: Areeb Ahmed <areebahmed0709@gmail.com>

build/build.go

@@ -1030,7 +1030,11 @@ func detectSharedMounts(ctx context.Context, reqs map[string][]*reqForNode) (_ m
 	m := map[string]map[fsKey]*fsTracker{}
 	for _, reqs := range reqs {
 		for _, req := range reqs {
-			nodeName := req.ResolvedNode.Node().Name
+			nodeName := req.Node().Name
+			// skip shared-session optimisation: targets may connect to different replicas.
+			if req.Node().Driver != nil && req.Node().Driver.RequiresUncachedClient() {
+				continue
+			}
 			if _, ok := m[nodeName]; !ok {
 				m[nodeName] = map[fsKey]*fsTracker{}
 			}

build/resolver/driver.go

@@ -57,6 +57,14 @@ func (dp ResolvedNode) Platforms() []ocispecs.Platform {
 }
 
 func (dp ResolvedNode) Client(ctx context.Context) (*client.Client, error) {
+	node := dp.resolver.nodes[dp.driverIndex]
+	// loadbalance=random requires a fresh connection per call so each target lands on a different pod.
+	if node.Driver != nil && node.Driver.RequiresUncachedClient() {
+		if _, err := dp.resolver.boot(ctx, []int{dp.driverIndex}, nil); err != nil {
+			return nil, err
+		}
+		return node.Driver.UncachedClient(ctx)
+	}
 	clients, err := dp.resolver.boot(ctx, []int{dp.driverIndex}, nil)
 	if err != nil {
 		return nil, err