Move ActiveDeadlineSeconds to use lifecycle observers

pkg/kubelet/active_deadline.go

+/*
+Copyright 2016 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package kubelet
+
+import (
+	"fmt"
+	"time"
+
+	"k8s.io/kubernetes/pkg/api"
+	"k8s.io/kubernetes/pkg/client/record"
+	"k8s.io/kubernetes/pkg/kubelet/lifecycle"
+	"k8s.io/kubernetes/pkg/kubelet/status"
+	"k8s.io/kubernetes/pkg/util"
+)
+
+const (
+	reason  = "DeadlineExceeded"
+	message = "Pod was active on the node longer than the specified deadline"
+)
+
+// activeDeadlineHandler knows how to enforce active deadlines on pods.
+type activeDeadlineHandler struct {
+	// the clock to use for deadline enforcement
+	clock util.Clock
+	// the provider of pod status
+	podStatusProvider status.PodStatusProvider
+	// the recorder to dispatch events when we identify a pod has exceeded active deadline
+	recorder record.EventRecorder
+}
+
+// newActiveDeadlineHandler returns an active deadline handler that can enforce pod active deadline
+func newActiveDeadlineHandler(
+	podStatusProvider status.PodStatusProvider,
+	recorder record.EventRecorder,
+	clock util.Clock,
+) (*activeDeadlineHandler, error) {
+
+	// check for all required fields
+	if clock == nil || podStatusProvider == nil || recorder == nil {
+		return nil, fmt.Errorf("Required arguments must not be nil: %v, %v, %v", clock, podStatusProvider, recorder)
+	}
+	return &activeDeadlineHandler{
+		clock:             clock,
+		podStatusProvider: podStatusProvider,
+		recorder:          recorder,
+	}, nil
+}
+
+// ShouldSync returns true if the pod is past its active deadline.
+func (m *activeDeadlineHandler) ShouldSync(pod *api.Pod) bool {
+	return m.pastActiveDeadline(pod)
+}
+
+// ShouldEvict returns true if the pod is past its active deadline.
+// It dispatches an event that the pod should be evicted if it is past its deadline.
+func (m *activeDeadlineHandler) ShouldEvict(pod *api.Pod) lifecycle.ShouldEvictResponse {
+	if !m.pastActiveDeadline(pod) {
+		return lifecycle.ShouldEvictResponse{Evict: false}
+	}
+	m.recorder.Eventf(pod, api.EventTypeNormal, reason, message)
+	return lifecycle.ShouldEvictResponse{Evict: true, Reason: reason, Message: message}
+}
+
+// pastActiveDeadline returns true if the pod has been active for more than its ActiveDeadlineSeconds
+func (m *activeDeadlineHandler) pastActiveDeadline(pod *api.Pod) bool {
+	// no active deadline was specified
+	if pod.Spec.ActiveDeadlineSeconds == nil {
+		return false
+	}
+	// get the latest status to determine if it was started
+	podStatus, ok := m.podStatusProvider.GetPodStatus(pod.UID)
+	if !ok {
+		podStatus = pod.Status
+	}
+	// we have no start time so just return
+	if podStatus.StartTime.IsZero() {
+		return false
+	}
+	// determine if the deadline was exceeded
+	start := podStatus.StartTime.Time
+	duration := m.clock.Since(start)
+	allowedDuration := time.Duration(*pod.Spec.ActiveDeadlineSeconds) * time.Second
+	return duration >= allowedDuration
+}

pkg/kubelet/active_deadline_test.go

+/*
+Copyright 2016 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package kubelet
+
+import (
+	"testing"
+	"time"
+
+	"k8s.io/kubernetes/pkg/api"
+	"k8s.io/kubernetes/pkg/api/unversioned"
+	"k8s.io/kubernetes/pkg/client/record"
+	"k8s.io/kubernetes/pkg/types"
+	"k8s.io/kubernetes/pkg/util"
+)
+
+// mockPodStatusProvider returns the status on the specified pod
+type mockPodStatusProvider struct {
+	pods []*api.Pod
+}
+
+// GetPodStatus returns the status on the associated pod with matching uid (if found)
+func (m *mockPodStatusProvider) GetPodStatus(uid types.UID) (api.PodStatus, bool) {
+	for _, pod := range m.pods {
+		if pod.UID == uid {
+			return pod.Status, true
+		}
+	}
+	return api.PodStatus{}, false
+}
+
+// TestActiveDeadlineHandler verifies the active deadline handler functions as expected.
+func TestActiveDeadlineHandler(t *testing.T) {
+	pods := newTestPods(4)
+	fakeClock := util.NewFakeClock(time.Now())
+	podStatusProvider := &mockPodStatusProvider{pods: pods}
+	fakeRecorder := &record.FakeRecorder{}
+	handler, err := newActiveDeadlineHandler(podStatusProvider, fakeRecorder, fakeClock)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+
+	now := unversioned.Now()
+	startTime := unversioned.NewTime(now.Time.Add(-1 * time.Minute))
+
+	// this pod has exceeded its active deadline
+	exceededActiveDeadlineSeconds := int64(30)
+	pods[0].Status.StartTime = &startTime
+	pods[0].Spec.ActiveDeadlineSeconds = &exceededActiveDeadlineSeconds
+
+	// this pod has not exceeded its active deadline
+	notYetActiveDeadlineSeconds := int64(120)
+	pods[1].Status.StartTime = &startTime
+	pods[1].Spec.ActiveDeadlineSeconds = &notYetActiveDeadlineSeconds
+
+	// this pod has no deadline
+	pods[2].Status.StartTime = &startTime
+	pods[2].Spec.ActiveDeadlineSeconds = nil
+
+	testCases := []struct {
+		pod      *api.Pod
+		expected bool
+	}{{pods[0], true}, {pods[1], false}, {pods[2], false}, {pods[3], false}}
+
+	for i, testCase := range testCases {
+		if actual := handler.ShouldSync(testCase.pod); actual != testCase.expected {
+			t.Errorf("[%d] ShouldSync expected %#v, got %#v", i, testCase.expected, actual)
+		}
+		actual := handler.ShouldEvict(testCase.pod)
+		if actual.Evict != testCase.expected {
+			t.Errorf("[%d] ShouldEvict.Evict expected %#v, got %#v", i, testCase.expected, actual.Evict)
+		}
+		if testCase.expected {
+			if actual.Reason != reason {
+				t.Errorf("[%d] ShouldEvict.Reason expected %#v, got %#v", i, message, actual.Reason)
+			}
+			if actual.Message != message {
+				t.Errorf("[%d] ShouldEvict.Message expected %#v, got %#v", i, message, actual.Message)
+			}
+		}
+	}
+}

pkg/kubelet/kubelet.go

@@ -530,6 +530,14 @@ func NewMainKubelet(
 	klet.evictionManager = evictionManager
 	klet.AddPodAdmitHandler(evictionAdmitHandler)
 
+	// enable active deadline handler
+	activeDeadlineHandler, err := newActiveDeadlineHandler(klet.statusManager, klet.recorder, klet.clock)
+	if err != nil {
+		return nil, err
+	}
+	klet.AddPodSyncLoopHandler(activeDeadlineHandler)
+	klet.AddPodSyncHandler(activeDeadlineHandler)
+
 	// apply functional Option's
 	for _, opt := range kubeOptions {
 		opt(klet)
@@ -2076,29 +2084,8 @@ func (kl *Kubelet) cleanupBandwidthLimits(allPods []*api.Pod) error {
 	return nil
 }
 
-// pastActiveDeadline returns true if the pod has been active for more than
-// ActiveDeadlineSeconds.
-func (kl *Kubelet) pastActiveDeadline(pod *api.Pod) bool {
-	if pod.Spec.ActiveDeadlineSeconds != nil {
-		podStatus, ok := kl.statusManager.GetPodStatus(pod.UID)
-		if !ok {
-			podStatus = pod.Status
-		}
-		if !podStatus.StartTime.IsZero() {
-			startTime := podStatus.StartTime.Time
-			duration := kl.clock.Since(startTime)
-			allowedDuration := time.Duration(*pod.Spec.ActiveDeadlineSeconds) * time.Second
-			if duration >= allowedDuration {
-				return true
-			}
-		}
-	}
-	return false
-}
-
 // Get pods which should be resynchronized. Currently, the following pod should be resynchronized:
 //   * pod whose work is ready.
-//   * pod past the active deadline.
 //   * internal modules that request sync of a pod.
 func (kl *Kubelet) getPodsToSync() []*api.Pod {
 	allPods := kl.podManager.GetPods()
@@ -2109,12 +2096,6 @@ func (kl *Kubelet) getPodsToSync() []*api.Pod {
 	}
 	var podsToSync []*api.Pod
 	for _, pod := range allPods {
-		// TODO: move active deadline code into a sync/evict pattern
-		if kl.pastActiveDeadline(pod) {
-			// The pod has passed the active deadline
-			podsToSync = append(podsToSync, pod)
-			continue
-		}
 		if podUIDSet.Has(string(pod.UID)) {
 			// The work of the pod is ready
 			podsToSync = append(podsToSync, pod)
@@ -3546,17 +3527,6 @@ func (kl *Kubelet) generateAPIPodStatus(pod *api.Pod, podStatus *kubecontainer.P
 		}
 	}
 
-	// TODO: Consider include the container information.
-	// TODO: move this into a sync/evictor
-	if kl.pastActiveDeadline(pod) {
-		reason := "DeadlineExceeded"
-		kl.recorder.Eventf(pod, api.EventTypeNormal, reason, "Pod was active on the node longer than specified deadline")
-		return api.PodStatus{
-			Phase:   api.PodFailed,
-			Reason:  reason,
-			Message: "Pod was active on the node longer than specified deadline"}
-	}
-
 	s := kl.convertStatusToAPIStatus(pod, podStatus)
 
 	// Assume info is ready to process

pkg/kubelet/kubelet_test.go

@@ -188,6 +188,7 @@ func newTestKubeletWithImageList(
 	fakeRecorder := &record.FakeRecorder{}
 	fakeKubeClient := &fake.Clientset{}
 	kubelet := &Kubelet{}
+	kubelet.recorder = fakeRecorder
 	kubelet.kubeClient = fakeKubeClient
 	kubelet.os = &containertest.FakeOS{}
 
@@ -305,6 +306,14 @@ func newTestKubeletWithImageList(
 		t.Fatalf("failed to initialize volume manager: %v", err)
 	}
 
+	// enable active deadline handler
+	activeDeadlineHandler, err := newActiveDeadlineHandler(kubelet.statusManager, kubelet.recorder, kubelet.clock)
+	if err != nil {
+		t.Fatalf("can't initialize active deadline handler: %v", err)
+	}
+	kubelet.AddPodSyncLoopHandler(activeDeadlineHandler)
+	kubelet.AddPodSyncHandler(activeDeadlineHandler)
+
 	return &TestKubelet{kubelet, fakeRuntime, mockCadvisor, fakeKubeClient, fakeMirrorClient, fakeClock, nil, plug}
 }
 
@@ -3891,33 +3900,6 @@ func TestMakePortMappings(t *testing.T) {
 	}
 }
 
-func TestIsPodPastActiveDeadline(t *testing.T) {
-	testKubelet := newTestKubelet(t, false /* controllerAttachDetachEnabled */)
-	kubelet := testKubelet.kubelet
-	pods := newTestPods(5)
-
-	exceededActiveDeadlineSeconds := int64(30)
-	notYetActiveDeadlineSeconds := int64(120)
-	now := unversioned.Now()
-	startTime := unversioned.NewTime(now.Time.Add(-1 * time.Minute))
-	pods[0].Status.StartTime = &startTime
-	pods[0].Spec.ActiveDeadlineSeconds = &exceededActiveDeadlineSeconds
-	pods[1].Status.StartTime = &startTime
-	pods[1].Spec.ActiveDeadlineSeconds = &notYetActiveDeadlineSeconds
-	tests := []struct {
-		pod      *api.Pod
-		expected bool
-	}{{pods[0], true}, {pods[1], false}, {pods[2], false}, {pods[3], false}, {pods[4], false}}
-
-	kubelet.podManager.SetPods(pods)
-	for i, tt := range tests {
-		actual := kubelet.pastActiveDeadline(tt.pod)
-		if actual != tt.expected {
-			t.Errorf("[%d] expected %#v, got %#v", i, tt.expected, actual)
-		}
-	}
-}
-
 func TestSyncPodsSetStatusToFailedForPodsThatRunTooLong(t *testing.T) {
 	testKubelet := newTestKubelet(t, false /* controllerAttachDetachEnabled */)
 	fakeRuntime := testKubelet.fakeRuntime
@@ -3965,7 +3947,7 @@ func TestSyncPodsSetStatusToFailedForPodsThatRunTooLong(t *testing.T) {
 		t.Errorf("expected to found status for pod %q", pods[0].UID)
 	}
 	if status.Phase != api.PodFailed {
-		t.Fatalf("expected pod status %q, ot %q.", api.PodFailed, status.Phase)
+		t.Fatalf("expected pod status %q, got %q.", api.PodFailed, status.Phase)
 	}
 }
 

pkg/kubelet/status/status_manager.go

@@ -66,16 +66,22 @@ type manager struct {
 	apiStatusVersions map[types.UID]uint64
 }
 
-// status.Manager is the Source of truth for kubelet pod status, and should be kept up-to-date with
+// PodStatusProvider knows how to provide status for a pod.  It's intended to be used by other components
+// that need to introspect status.
+type PodStatusProvider interface {
+	// GetPodStatus returns the cached status for the provided pod UID, as well as whether it
+	// was a cache hit.
+	GetPodStatus(uid types.UID) (api.PodStatus, bool)
+}
+
+// Manager is the Source of truth for kubelet pod status, and should be kept up-to-date with
 // the latest api.PodStatus. It also syncs updates back to the API server.
 type Manager interface {
+	PodStatusProvider
+
 	// Start the API server status sync loop.
 	Start()
 
-	// GetPodStatus returns the cached status for the provided pod UID, as well as whether it
-	// was a cache hit.
-	GetPodStatus(uid types.UID) (api.PodStatus, bool)
-
 	// SetPodStatus caches updates the cached status for the given pod, and triggers a status update.
 	SetPodStatus(pod *api.Pod, status api.PodStatus)