Don't recreate Kubernetes namespaces if they exist

Instead of attempting to create or update a Kubernetes
namespace on every deploy, only do so when we know it
doesn't exist yet.

2 files changed, 9 insertions, 7 deletions

diff --git a/lib/gitlab/ci/build/prerequisite/base.rb b/lib/gitlab/ci/build/prerequisite/base.rb
index d3c37a3e02e..156aa22d95b 100644
--- a/lib/gitlab/ci/build/prerequisite/base.rb
+++ b/lib/gitlab/ci/build/prerequisite/base.rb
@@ -5,6 +5,8 @@ module Gitlab
     module Build
       module Prerequisite
         class Base
+          include Utils::StrongMemoize
+
           attr_reader :build
 
           def initialize(build)
diff --git a/lib/gitlab/ci/build/prerequisite/kubernetes_namespace.rb b/lib/gitlab/ci/build/prerequisite/kubernetes_namespace.rb
index 3d66b13caa6..41135ae62bb 100644
--- a/lib/gitlab/ci/build/prerequisite/kubernetes_namespace.rb
+++ b/lib/gitlab/ci/build/prerequisite/kubernetes_namespace.rb
@@ -5,12 +5,8 @@ module Gitlab
     module Build
       module Prerequisite
         class KubernetesNamespace < Base
-          ##
-          # Cluster settings may have changed since the last deploy,
-          # so we must always ensure the namespace is up to date.
-          #
           def unmet?
-            deployment_cluster.present?
+            deployment_cluster.present? && kubernetes_namespace.new_record?
           end
 
           def complete!
@@ -25,9 +21,13 @@ module Gitlab
             build.deployment&.cluster
           end
 
-          def create_or_update_namespace
-            kubernetes_namespace = deployment_cluster.find_or_initialize_kubernetes_namespace_for_project(build.project)
+          def kubernetes_namespace
+            strong_memoize(:kubernetes_namespace) do
+              deployment_cluster.find_or_initialize_kubernetes_namespace_for_project(build.project)
+            end
+          end
 
+          def create_or_update_namespace
             Clusters::Gcp::Kubernetes::CreateOrUpdateNamespaceService.new(
               cluster: deployment_cluster,
               kubernetes_namespace: kubernetes_namespace