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Slow-start batch pod creation of rs, rc, ds, jobs

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Prevent too-large replicas from generating enormous numbers
of events by creating only a few pods at a time, then increasing
the batch size when pod creations succeed. Stop creating batches
of pods when any pod creation errors are encountered.
This commit is contained in:
Joel Smith
2017-07-10 22:04:35 -06:00
parent 6a845c67f0
commit 1889a6ef52
13 changed files with 354 additions and 131 deletions
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22
pkg/controller/daemon/daemon_controller_test.go
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@@ -412,6 +412,28 @@ func TestSimpleDaemonSetLaunchesPods(t *testing.T) {
}
}
// Simulate a cluster with 100 nodes, but simulate a limit (like a quota limit)
// of 10 pods, and verify that the ds doesn't make 100 create calls per sync pass
func TestSimpleDaemonSetPodCreateErrors(t *testing.T) {
for _, strategy := range updateStrategies() {
ds := newDaemonSet("foo")
ds.Spec.UpdateStrategy = *strategy
manager, podControl, _ := newTestController(ds)
podControl.FakePodControl.CreateLimit = 10
addNodes(manager.nodeStore, 0, podControl.FakePodControl.CreateLimit*10, nil)
manager.dsStore.Add(ds)
syncAndValidateDaemonSets(t, manager, ds, podControl, podControl.FakePodControl.CreateLimit, 0, 0)
expectedLimit := 0
for pass := uint8(0); expectedLimit <= podControl.FakePodControl.CreateLimit; pass++ {
expectedLimit += controller.SlowStartInitialBatchSize << pass
}
if podControl.FakePodControl.CreateCallCount > expectedLimit {
t.Errorf("Unexpected number of create calls. Expected <= %d, saw %d\n", podControl.FakePodControl.CreateLimit*2, podControl.FakePodControl.CreateCallCount)
}
}
}
func TestSimpleDaemonSetUpdatesStatusAfterLaunchingPods(t *testing.T) {
for _, strategy := range updateStrategies() {
ds := newDaemonSet("foo")