🐛 Fixed a bug in newGVKFixupWatcher which caused the metadata informer to hang #1790

wallrj · 2022-02-03T17:16:22Z

I copied some tests from client-go and observed that the original implementation of gvkFixupWatcher fails those tests:

go test ./pkg/cache/internal/... -timeout 2s
panic: test timed out after 2s

goroutine 34 [running]:
testing.(*M).startAlarm.func1()
	/home/richard/sdk/go1.17/src/testing/testing.go:1788 +0x8e
created by time.goFunc
	/home/richard/sdk/go1.17/src/time/sleep.go:180 +0x31

goroutine 1 [chan receive]:
testing.(*T).Run(0xc0003f49c0, {0x128a598, 0x46c533}, 0x1327bb0)
	/home/richard/sdk/go1.17/src/testing/testing.go:1307 +0x375
testing.runTests.func1(0xc0003f49c0)
	/home/richard/sdk/go1.17/src/testing/testing.go:1598 +0x6e
testing.tRunner(0xc0003f49c0, 0xc000187d18)
	/home/richard/sdk/go1.17/src/testing/testing.go:1259 +0x102
testing.runTests(0xc0003a9980, {0x1d4e810, 0x1, 0x1}, {0x48986d, 0x1285e22, 0x1d6a3c0})
	/home/richard/sdk/go1.17/src/testing/testing.go:1596 +0x43f
testing.(*M).Run(0xc0003a9980)
	/home/richard/sdk/go1.17/src/testing/testing.go:1504 +0x51d
main.main()
	_testmain.go:43 +0x14b

goroutine 19 [chan receive]:
k8s.io/klog/v2.(*loggingT).flushDaemon(0x0)
	/home/richard/go/pkg/mod/k8s.io/klog/[email protected]/klog.go:1181 +0x6a
created by k8s.io/klog/v2.init.0
	/home/richard/go/pkg/mod/k8s.io/klog/[email protected]/klog.go:420 +0xfb

goroutine 20 [sleep]:
time.Sleep(0x6fc23ac00)
	/home/richard/sdk/go1.17/src/runtime/time.go:193 +0x12e
sigs.k8s.io/controller-runtime/pkg/log.init.0.func1()
	/home/richard/projects/kubernetes-sigs/controller-runtime/pkg/log/log.go:63 +0x38
created by sigs.k8s.io/controller-runtime/pkg/log.init.0
	/home/richard/projects/kubernetes-sigs/controller-runtime/pkg/log/log.go:62 +0x25

goroutine 21 [chan receive]:
sigs.k8s.io/controller-runtime/pkg/cache/internal.TestGVKFixupWatcher.func1({0x141ab60, 0xc00045ad80})
	/home/richard/projects/kubernetes-sigs/controller-runtime/pkg/cache/internal/informers_map_test.go:105 +0x85
sigs.k8s.io/controller-runtime/pkg/cache/internal.TestGVKFixupWatcher(0xc0003f4b60)
	/home/richard/projects/kubernetes-sigs/controller-runtime/pkg/cache/internal/informers_map_test.go:121 +0x52b
testing.tRunner(0xc0003f4b60, 0x1327bb0)
	/home/richard/sdk/go1.17/src/testing/testing.go:1259 +0x102
created by testing.(*T).Run
	/home/richard/sdk/go1.17/src/testing/testing.go:1306 +0x35a
FAIL	sigs.k8s.io/controller-runtime/pkg/cache/internal	2.026s
FAIL

I've now re-implemented the gvkFixupWatcher as a watch.FilterFunc along with watch.Filter which seems to have the desired behaviour.

go test ./pkg/cache/internal/... -timeout 2s
ok  	sigs.k8s.io/controller-runtime/pkg/cache/internal	0.023s

This change allows the reflector to know when the ResultChannel is closed at which point it breaks from its watch loop and establishes a new watch:

https://github.com/kubernetes/kubernetes/blob/adbda068c1808fcc8a64a94269e0766b5c46ec41/staging/src/k8s.io/client-go/tools/cache/reflector.go#L474

k8s-ci-robot · 2022-02-03T17:16:36Z

Hi @wallrj. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

I understand the commands that are listed here.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

joelanford · 2022-02-03T20:54:34Z

pkg/cache/internal/informers_map.go

@@ -434,12 +434,12 @@ func (w *gvkFixupWatcher) run() {
 		w.ch <- e
 	}
 	w.wg.Done()
+	close(w.ch)


Should this be moved above w.wg.Done() so that there's a guarantee that w.ch is closed by the time w.Stop() returns?

I found watch.Filter which has the correct channel closing behaviour so I've re-implemented. See what you think.

Nice! TIL about watch.Filter.

wallrj · 2022-02-03T21:26:29Z

pkg/cache/internal/informers_map.go

+		watcher,
+		func(in watch.Event) (out watch.Event, keep bool) {
+			in.DeepCopyInto(&out)
+			out.Object.GetObjectKind().SetGroupVersionKind(gvk)


The original implementation mutated the watch event.
I've used DeepCopy here, but I'm not sure if it's necessary.

I don't think DeepCopy is necessary.

The in watch.Event is passed in by value, but it has a pointer to a runtime.Object (e.g. &metav1.PartialObjectMetadata ) which might be mutated elsewhere, so I thought it was safest to DeepCopy.

Yeah, no strong objections to DeepCopy from me!

Don't think it is necessary, but no strong objections from me too :)

+1 to remove deepcopy

pkg/cache/internal/informers_map_test.go

wallrj · 2022-02-03T21:28:57Z

pkg/cache/internal/informers_map_test.go

+		f.Modify(newTestType("bar"))
+		f.Delete(newTestType("bar"))
+		f.Error(newTestType("error: blah"))
+		f.Stop()


Note: The test sends events to the wrapped watcher and then checks the results that come from the wrapper.

joelanford · 2022-02-04T01:41:23Z

/ok-to-test

joelanford · 2022-02-04T02:01:57Z

pkg/cache/internal/informers_map_test.go

+// TestGVKFixupWatcher tests that gvkFixupWatcher behaves like the watch that it
+// wraps and that it overrides the GVK.
+// Adapted from https://github.com/kubernetes/kubernetes/blob/adbda068c1808fcc8a64a94269e0766b5c46ec41/staging/src/k8s.io/apimachinery/pkg/watch/watch_test.go#L33-L78
+func TestGVKFixupWatcher(t *testing.T) {


AFAIK, the rest of controller-runtime's tests use Ginkgo/Gomega. Would you mind refactoring this test to be consistent with the rest of the repo?

I've re-implemented the tests using Gomega Expect , but tried to retain the spirit of the original tests so that they can be easily compared to the original.

Also replaced the convoluted fake type with actual metav1.PartialObjectMetadata

Signed-off-by: Richard Wall <[email protected]>

wallrj · 2022-02-04T11:58:18Z

Some evidence that the problem has been fixed:

Test fails with the old implementation

 richard   0fbdc4b  ~  projects  kubernetes-sigs  controller-runtime  1  go test ./pkg/cache/internal/... -v --ginkgo.v
=== RUN   TestSource
Running Suite: Cache Internal Suite
===================================
Random Seed: 1643975186
Will run 1 of 1 specs

gvkFixupWatcher 
  behaves like watch.FakeWatcher
  /home/richard/projects/kubernetes-sigs/controller-runtime/pkg/cache/internal/informers_map_test.go:35
STEP: Fixing up watch.EventType: ADDED and passing it on
STEP: Fixing up watch.EventType: MODIFIED and passing it on
STEP: Fixing up watch.EventType: MODIFIED and passing it on
STEP: Fixing up watch.EventType: DELETED and passing it on
STEP: Fixing up watch.EventType: ERROR and passing it on

• Failure [1.002 seconds]
gvkFixupWatcher
/home/richard/projects/kubernetes-sigs/controller-runtime/pkg/cache/internal/informers_map_test.go:34
  behaves like watch.FakeWatcher [It]
  /home/richard/projects/kubernetes-sigs/controller-runtime/pkg/cache/internal/informers_map_test.go:35

  Timed out after 1.001s.
  Expected
      <<-chan watch.Event | len:0, cap:0>: 0xc0000be540
  to be closed

  /home/richard/projects/kubernetes-sigs/controller-runtime/pkg/cache/internal/informers_map_test.go:79
------------------------------



Summarizing 1 Failure:

[Fail] gvkFixupWatcher [It] behaves like watch.FakeWatcher 
/home/richard/projects/kubernetes-sigs/controller-runtime/pkg/cache/internal/informers_map_test.go:79

Ran 1 of 1 Specs in 1.002 seconds
FAIL! -- 0 Passed | 1 Failed | 0 Pending | 0 Skipped
--- FAIL: TestSource (1.00s)
FAIL
FAIL	sigs.k8s.io/controller-runtime/pkg/cache/internal	1.039s
FAIL

Test succeeds with the new implementation

richard   1789-close-metadata-watch-result-channel  ~  projects  kubernetes-sigs  controller-runtime  1  go test ./pkg/cache/internal/... -v --ginkgo.v
=== RUN   TestSource
Running Suite: Cache Internal Suite
===================================
Random Seed: 1643975277
Will run 1 of 1 specs

gvkFixupWatcher 
  behaves like watch.FakeWatcher
  /home/richard/projects/kubernetes-sigs/controller-runtime/pkg/cache/internal/informers_map_test.go:35
STEP: Fixing up watch.EventType: ADDED and passing it on
STEP: Fixing up watch.EventType: MODIFIED and passing it on
STEP: Fixing up watch.EventType: MODIFIED and passing it on
STEP: Fixing up watch.EventType: DELETED and passing it on
STEP: Fixing up watch.EventType: ERROR and passing it on
•

Ran 1 of 1 Specs in 0.010 seconds
SUCCESS! -- 1 Passed | 0 Failed | 0 Pending | 0 Skipped
--- PASS: TestSource (0.01s)
PASS
ok  	sigs.k8s.io/controller-runtime/pkg/cache/internal	0.027s

A sample informer now closes and re-establishes watches regularly

https://github.com/wallrj/tmp-controller-runtime-partial-object-experiment/blob/44e2c5d088d891252edf36056d9297bd66a17d7d/cmd/ctrl-metadata-informer/main.go

diff --git a/go.mod b/go.mod
index fb929dc..99e989c 100644
--- a/go.mod
+++ b/go.mod
@@ -14,6 +14,8 @@ require (
        sigs.k8s.io/controller-runtime v0.11.0
 )
 
+replace sigs.k8s.io/controller-runtime => ../../kubernetes-sigs/controller-runtime
+
 require (
        cloud.google.com/go v0.81.0 // indirect
        github.com/Azure/go-autorest v14.2.0+incompatible // indirect

richard   master  ~  projects  wallrj  partial-object-watch  1  go run ./cmd/ctrl-metadata-informer --zap-log-level 8 --zap-time-encoding iso8601 --namespace test1

2022-02-04T10:21:54.413Z        LEVEL(-6)       Config loaded from file:  /home/richard/.kube/config
...


2022-02-04T11:38:59.523Z        INFO    add     {"name": "test1/foo-9673"}
2022-02-04T11:39:23.998Z        LEVEL(-4)       pkg/mod/k8s.io/[email protected]/tools/cache/reflector.go:167: Watch close - *v1.PartialObjectMetadata total 15 items received

2022-02-04T11:39:23.998Z        INFO    GET https://127.0.0.1:46255/api/v1/namespaces/test1/secrets?allowWatchBookmarks=true&resourceVersion=78217&timeout=8m3s&timeoutSeconds=483&watch=true

2022-02-04T11:39:23.998Z        INFO    Request Headers:

2022-02-04T11:39:23.998Z        INFO        Accept: application/vnd.kubernetes.protobuf;as=PartialObjectMetadata;g=meta.k8s.io;v=v1,application/json;as=PartialObjectMetadata;g=meta.k8s.io;v=v1,application/json

2022-02-04T11:39:23.998Z        INFO        User-Agent: ctrl-metadata-informer/v0.0.0 (linux/amd64) kubernetes/$Format

2022-02-04T11:39:24.000Z        INFO    Response Status: 200 OK in 1 milliseconds

2022-02-04T11:39:24.000Z        INFO    Response Headers:

2022-02-04T11:39:24.000Z        INFO        Content-Type: application/vnd.kubernetes.protobuf;stream=watch

2022-02-04T11:39:24.000Z        INFO        Date: Fri, 04 Feb 2022 11:39:24 GMT

2022-02-04T11:39:24.000Z        INFO        Cache-Control: no-cache, private

2022-02-04T11:39:59.621Z        INFO    add     {"name": "test1/foo-25053"}
2022-02-04T11:40:59.744Z        INFO    add     {"name": "test1/foo-10768"}
2022-02-04T11:41:59.849Z        INFO    add     {"name": "test1/foo-7385"}
2022-02-04T11:42:59.958Z        INFO    add     {"name": "test1/foo-24315"}
2022-02-04T11:44:00.062Z        INFO    add     {"name": "test1/foo-26661"}
2022-02-04T11:45:00.151Z        INFO    add     {"name": "test1/foo-21396"}
2022-02-04T11:46:00.299Z        INFO    add     {"name": "test1/foo-23017"}
2022-02-04T11:47:00.451Z        INFO    add     {"name": "test1/foo-21648"}
2022-02-04T11:47:27.000Z        LEVEL(-4)       pkg/mod/k8s.io/[email protected]/tools/cache/reflector.go:167: Watch close - *v1.PartialObjectMetadata total 17 items received

2022-02-04T11:47:27.001Z        INFO    GET https://127.0.0.1:46255/api/v1/namespaces/test1/secrets?allowWatchBookmarks=true&resourceVersion=79033&timeout=8m2s&timeoutSeconds=482&watch=true

2022-02-04T11:47:27.001Z        INFO    Request Headers:

2022-02-04T11:47:27.001Z        INFO        Accept: application/vnd.kubernetes.protobuf;as=PartialObjectMetadata;g=meta.k8s.io;v=v1,application/json;as=PartialObjectMetadata;g=meta.k8s.io;v=v1,application/json

2022-02-04T11:47:27.001Z        INFO        User-Agent: ctrl-metadata-informer/v0.0.0 (linux/amd64) kubernetes/$Format

2022-02-04T11:47:27.004Z        INFO    Response Status: 200 OK in 2 milliseconds

2022-02-04T11:47:27.004Z        INFO    Response Headers:

2022-02-04T11:47:27.004Z        INFO        Cache-Control: no-cache, private

2022-02-04T11:47:27.004Z        INFO        Content-Type: application/vnd.kubernetes.protobuf;stream=watch

2022-02-04T11:47:27.004Z        INFO        Date: Fri, 04 Feb 2022 11:47:27 GMT

2022-02-04T11:48:00.596Z        INFO    add     {"name": "test1/foo-207"}
2022-02-04T11:49:00.692Z        INFO    add     {"name": "test1/foo-5199"}

joelanford

/approve

Thanks for all the help on this!

joelanford · 2022-02-04T15:30:18Z

pkg/cache/internal/informers_map.go

+// newGVKFixupWatcher adds a wrapper that preserves the GVK information when
+// events come in.
+//
+// This works around a bug where GVK information is not passed into mapping
+// functions when using the OnlyMetadata option in the builder.
+// This issue is most likely caused by kubernetes/kubernetes#80609.
+// See kubernetes-sigs/controller-runtime#1484.
+//
+// This was originally implemented as a cache.ResourceEventHandler wrapper but
+// that contained a data race which was resolved by setting the GVK in a watch
+// wrapper, before the objects are written to the cache.
+// See kubernetes-sigs/controller-runtime#1650.
+//
+// The original watch wrapper was found to be incompatible with
+// k8s.io/client-go/tools/cache.Reflector so it has been re-implemented as a
+// watch.Filter which is compatible.
+// See kubernetes-sigs/controller-runtime#1789.


🎉 Thanks for capturing all of that history!

joelanford · 2022-02-04T15:31:04Z

pkg/cache/internal/informers_map.go

+		watcher,
+		func(in watch.Event) (out watch.Event, keep bool) {
+			in.DeepCopyInto(&out)
+			out.Object.GetObjectKind().SetGroupVersionKind(gvk)


Yeah, no strong objections to DeepCopy from me!

k8s-ci-robot · 2022-02-04T15:32:51Z

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: joelanford, wallrj

The full list of commands accepted by this bot can be found here.

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Needs approval from an approver in each of these files:

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wallrj · 2022-02-05T18:19:52Z

/cc @vincepri because I see that you introduced the metadata only watches in ClusterAPI and which may have been affected by this bug since upgrading to controller-runtime v0.10.1 in kubernetes-sigs/cluster-api#5249

FillZpp

Mostly LG. Copyright should be 2022.

FillZpp · 2022-02-07T02:38:00Z

pkg/cache/internal/informers_map_test.go

@@ -0,0 +1,94 @@
+/*
+Copyright 2018 The Kubernetes Authors.


s/2018/2022/

FillZpp · 2022-02-07T02:38:20Z

pkg/cache/internal/internal_suite_test.go

@@ -0,0 +1,31 @@
+/*
+Copyright 2018 The Kubernetes Authors.


s/2018/2022/

FillZpp · 2022-02-07T02:40:34Z

pkg/cache/internal/informers_map.go

+		watcher,
+		func(in watch.Event) (out watch.Event, keep bool) {
+			in.DeepCopyInto(&out)
+			out.Object.GetObjectKind().SetGroupVersionKind(gvk)


Don't think it is necessary, but no strong objections from me too :)

Signed-off-by: Richard Wall <[email protected]>

FillZpp · 2022-02-08T02:30:09Z

/lgtm

Thanks for all the help on this!

joelanford · 2022-02-10T17:22:09Z

Let's see if this works:

/cherry-pick release-0.11

k8s-infra-cherrypick-robot · 2022-02-10T17:22:48Z

@joelanford: new pull request created: #1801

In response to this:

Let's see if this works:

/cherry-pick release-0.11

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wallrj force-pushed the 1789-close-metadata-watch-result-channel branch from 0359498 to cab8dd1 Compare February 3, 2022 21:17

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wallrj changed the title ~~🐛 WIP: Close the metadata watch result channel earlier~~ 🐛 Close the metadata watch result channel earlier Feb 3, 2022

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wallrj added 2 commits February 4, 2022 09:54

Test that gvkFixupWatcher matches the behaviour of watch.FakeWatcher

0fbdc4b

Signed-off-by: Richard Wall <[email protected]>

Re-implement gvkFixupWatcher as a watch.FilterFunc

5f4904e

Signed-off-by: Richard Wall <[email protected]>

wallrj force-pushed the 1789-close-metadata-watch-result-channel branch from cab8dd1 to 5f4904e Compare February 4, 2022 09:54

wallrj requested a review from joelanford February 4, 2022 10:03

wallrj changed the title ~~🐛 Close the metadata watch result channel earlier~~ 🐛 Fixed a bug in newGVKFixupWatcher which caused the metadata informer to hang Feb 4, 2022

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Update copyright headers

7ab04d5

Signed-off-by: Richard Wall <[email protected]>

wallrj requested a review from FillZpp February 7, 2022 18:39

Remove DeepCopy, as suggested during code review

a4e0eee

Signed-off-by: Richard Wall <[email protected]>

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🐛 [release-0.11] Fixed a bug in newGVKFixupWatcher which caused the metadata informer to hang #1801

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🐛 Fixed a bug in newGVKFixupWatcher which caused the metadata informer to hang #1790

🐛 Fixed a bug in newGVKFixupWatcher which caused the metadata informer to hang #1790

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🐛 Fixed a bug in newGVKFixupWatcher which caused the metadata informer to hang #1790

🐛 Fixed a bug in newGVKFixupWatcher which caused the metadata informer to hang #1790

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