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Merge pull request #36377 from nikhiljindal/fixrace

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Automatic merge from submit-queue

Fix a data race condition in federation namespace controller

Fixes https://github.com/kubernetes/kubernetes/issues/36364

Fixing federation namespace controller to create a copy of namespace fetched from the store before editing it. Without it there is a data race condition with other readers of the store.

cc @kubernetes/sig-cluster-federation @mwielgus @madhusudancs
This commit is contained in:
Kubernetes Submit Queue 2016-11-07 13:50:52 -08:00 committed by GitHub
commit 123f995734
2 changed files with 12 additions and 2 deletions
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1
federation/pkg/federation-controller/namespace/BUILD
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@ -27,6 +27,7 @@ go_library(
"//pkg/client/clientset_generated/release_1_5:go_default_library",
"//pkg/client/record:go_default_library",
"//pkg/controller:go_default_library",
"//pkg/conversion:go_default_library",
"//pkg/runtime:go_default_library",
"//pkg/util/flowcontrol:go_default_library",
"//pkg/watch:go_default_library",

13
federation/pkg/federation-controller/namespace/namespace_controller.go
View File

@ -32,6 +32,7 @@ import (
kubeclientset "k8s.io/kubernetes/pkg/client/clientset_generated/release_1_5"
"k8s.io/kubernetes/pkg/client/record"
"k8s.io/kubernetes/pkg/controller"
"k8s.io/kubernetes/pkg/conversion"
"k8s.io/kubernetes/pkg/runtime"
"k8s.io/kubernetes/pkg/util/flowcontrol"
"k8s.io/kubernetes/pkg/watch"
@ -328,7 +329,7 @@ func (nc *NamespaceController) reconcileNamespace(namespace string) {
return
}
baseNamespaceObj, exist, err := nc.namespaceInformerStore.GetByKey(namespace)
namespaceObjFromStore, exist, err := nc.namespaceInformerStore.GetByKey(namespace)
if err != nil {
glog.Errorf("Failed to query main namespace store for %v: %v", namespace, err)
nc.deliverNamespace(namespace, 0, true)
@ -339,7 +340,15 @@ func (nc *NamespaceController) reconcileNamespace(namespace string) {
// Not federated namespace, ignoring.
return
}
baseNamespace := baseNamespaceObj.(*api_v1.Namespace)
// Create a copy before modifying the namespace to prevent race condition with
// other readers of namespace from store.
namespaceObj, err := conversion.NewCloner().DeepCopy(namespaceObjFromStore)
baseNamespace, ok := namespaceObj.(*api_v1.Namespace)
if err != nil || !ok {
glog.Errorf("Error in retrieving obj from store: %v, %v", ok, err)
nc.deliverNamespace(namespace, 0, true)
return
}
if baseNamespace.DeletionTimestamp != nil {
if err := nc.delete(baseNamespace); err != nil {
glog.Errorf("Failed to delete %s: %v", namespace, err)