diff --git a/executor/cleanup.go b/executor/cleanup.go
index 558e4d91..6eb2f0b0 100644
--- a/executor/cleanup.go
+++ b/executor/cleanup.go
@@ -202,6 +202,14 @@ func cleanupDeployments(client *kubernetes.Clientset, namespace string, instance
 			logErr("cleaning up deployment", err)
 			// ignore err
 		}
+		// Backward compatibility with older label name
+		pid, pok := dep.ObjectMeta.Labels[fission.POOLMGR_INSTANCEID_LABEL]
+		if pok && pid != instanceId {
+			log.Printf("Cleaning up deployment %v", dep.ObjectMeta.Name)
+			err := client.ExtensionsV1beta1().Deployments(namespace).Delete(dep.ObjectMeta.Name, nil)
+			logErr("cleaning up deployment", err)
+			// ignore err
+		}
 	}
 	return nil
 }
@@ -218,6 +226,13 @@ func cleanupReplicaSets(client *kubernetes.Clientset, namespace string, instance
 			err := client.ExtensionsV1beta1().ReplicaSets(namespace).Delete(rs.ObjectMeta.Name, nil)
 			logErr("cleaning up replicaset", err)
 		}
+		// Backward compatibility with older label name
+		pid, pok := rs.ObjectMeta.Labels[fission.POOLMGR_INSTANCEID_LABEL]
+		if pok && pid != instanceId {
+			log.Printf("Cleaning up replicaset %v", rs.ObjectMeta.Name)
+			err := client.ExtensionsV1beta1().ReplicaSets(namespace).Delete(rs.ObjectMeta.Name, nil)
+			logErr("cleaning up replicaset", err)
+		}
 	}
 	return nil
 }
@@ -235,6 +250,15 @@ func cleanupPods(client *kubernetes.Clientset, namespace string, instanceId stri
 			logErr("cleaning up pod", err)
 			// ignore err
 		}
+		// Backward compatibility with older label name
+		pid, pok := pod.ObjectMeta.Labels[fission.POOLMGR_INSTANCEID_LABEL]
+		if pok && pid != instanceId {
+			log.Printf("Cleaning up pod %v", pod.ObjectMeta.Name)
+			err := client.CoreV1().Pods(namespace).Delete(pod.ObjectMeta.Name, nil)
+			logErr("cleaning up pod", err)
+			// ignore err
+		}
+
 	}
 	return nil
 }
diff --git a/executor/poolmgr/gpm.go b/executor/poolmgr/gpm.go
index a3f2f7c4..9bbc62d1 100644
--- a/executor/poolmgr/gpm.go
+++ b/executor/poolmgr/gpm.go
@@ -89,14 +89,14 @@ func (gpm *GenericPoolManager) service() {
 			var err error
 			pool, ok := gpm.pools[crd.CacheKey(&req.env.Metadata)]
 			if !ok {
-				var poolSize = int32(req.env.Spec.Poolsize)
+				poolsize := gpm.getEnvPoolsize(req.env)
 				switch req.env.Spec.AllowedFunctionsPerContainer {
 				case fission.AllowedFunctionsPerContainerInfinite:
-					poolSize = 1
+					poolsize = 1
 				}
 
 				pool, err = MakeGenericPool(
-					gpm.fissionClient, gpm.kubernetesClient, req.env, poolSize,
+					gpm.fissionClient, gpm.kubernetesClient, req.env, poolsize,
 					gpm.namespace, gpm.fsCache, gpm.instanceId)
 				if err != nil {
 					req.responseChannel <- &response{error: err}
@@ -110,7 +110,7 @@ func (gpm *GenericPoolManager) service() {
 			latestEnvPoolsize := make(map[string]int)
 			for _, env := range req.envList {
 				latestEnvSet[crd.CacheKey(&env.Metadata)] = true
-				latestEnvPoolsize[crd.CacheKey(&env.Metadata)] = env.Spec.Poolsize
+				latestEnvPoolsize[crd.CacheKey(&env.Metadata)] = int(gpm.getEnvPoolsize(&env))
 			}
 			for key, pool := range gpm.pools {
 				_, ok := latestEnvSet[key]
@@ -166,7 +166,7 @@ func (gpm *GenericPoolManager) eagerPoolCreator() {
 		for i := range envs.Items {
 			env := envs.Items[i]
 			// Create pool only if poolsize greater than zero
-			if env.Spec.Poolsize > 0 {
+			if gpm.getEnvPoolsize(&env) > 0 {
 				_, err := gpm.GetPool(&envs.Items[i])
 				if err != nil {
 					log.Printf("eager-create pool failed: %v", err)
@@ -178,3 +178,13 @@ func (gpm *GenericPoolManager) eagerPoolCreator() {
 		gpm.CleanupPools(envs.Items)
 	}
 }
+
+func (gpm *GenericPoolManager) getEnvPoolsize(env *crd.Environment) int32 {
+	var poolsize int32
+	if env.Spec.Version < 3 {
+		poolsize = 3
+	} else {
+		poolsize = int32(env.Spec.Poolsize)
+	}
+	return poolsize
+}
diff --git a/types.go b/types.go
index c76f10ef..e627d363 100644
--- a/types.go
+++ b/types.go
@@ -314,6 +314,7 @@ type (
 )
 
 const EXECUTOR_INSTANCEID_LABEL string = "executorInstanceId"
+const POOLMGR_INSTANCEID_LABEL string = "poolmgrInstanceId"
 
 const (
 	ChecksumTypeSHA256 ChecksumType = "sha256"