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Chih-Chieh Yang 2022-07-30 00:13:48 +00:00
parent 4fc7fd25bf
commit ed74de833d
1 changed files with 10 additions and 0 deletions
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test/integration/apiserver/flowcontrol/concurrency_util_test.go
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@ -81,6 +81,16 @@ func setupWithAuthorizer(t testing.TB, maxReadonlyRequestsInFlight, maxMutatingR
return kubeConfig, tearDownFn return kubeConfig, tearDownFn
} }
// This integration test checks the client-side expected concurrency and the server-side observed concurrency
// to make sure that they are close within a small error bound and that the priority levels are isolated.
// This test differs from TestPriorityLevelIsolation since TestPriorityLevelIsolation checks throughput instead
// of concurrency. In order to mitigate the effects of system noise, authorization webhook is used to artificially
// increase request execution time to make the system noise relatively insignificant.
// This test calculates the server-side observed concurrency from average priority level seat utilization APF metric.
// It also assumes that
// (server-side request execution throughput) == (client-side request throughput) and derives a formula to
// calculate the client-side expected concurrency. The two are compared and a small error bound is determined
// from estimating the noise using 2*(standard deviation of requenst latency)/(avg request latency).
func TestConcurrencyIsolation(t *testing.T) { func TestConcurrencyIsolation(t *testing.T) {
defer featuregatetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, genericfeatures.APIPriorityAndFairness, true)() defer featuregatetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, genericfeatures.APIPriorityAndFairness, true)()
// NOTE: disabling the feature should fail the test // NOTE: disabling the feature should fail the test