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Change l4 healthcheck timeout
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According to l4 healthcheck constants
the default set up has timeout = 8 seconds
and threshold = 3 times. As result it can
lead to 24 (8*3) seconds of lost requests.
This change is supposed to decrease this
time to only 6 seconds for sharedHc=false.

Signed-off-by: Elina Akhmanova <elinka@google.com>
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@code-elinka
code-elinka committed Oct 3, 2022
1 parent 0d703c9 commit 0367e93
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Showing 2 changed files with 85 additions and 32 deletions.
29 changes: 22 additions & 7 deletions pkg/healthchecksl4/healthchecksl4.go
View file
Original file line number Diff line number Diff line change
Expand Up @@ -38,12 +38,13 @@ import (

const (
// L4 Load Balancer parameters
gceHcCheckIntervalSeconds = int64(8)
gceHcTimeoutSeconds = int64(1)
gceSharedHcCheckIntervalSeconds = int64(8) // Shared Health check Interval
gceLocalHcCheckIntervalSeconds = int64(3) // Local Health check Interval
gceHcTimeoutSeconds = int64(1)
// Start sending requests as soon as one healthcheck succeeds.
gceHcHealthyThreshold = int64(1)
// Defaults to 3 * 8 = 24 seconds before the LB will steer traffic away.
gceHcUnhealthyThreshold = int64(3)
gceHcHealthyThreshold = int64(1)
gceSharedHcUnhealthyThreshold = int64(3) // 3 * 8 = 24 seconds before the LB will steer traffic away
gceLocalHcUnhealthyThreshold = int64(2) // 2 * 3 = 6 seconds before the LB will steer traffic away
)

var (
Expand Down Expand Up @@ -302,12 +303,26 @@ func newL4HealthCheck(name string, svcName types.NamespacedName, shared bool, pa
if err != nil {
klog.Warningf("Failed to generate description for L4HealthCheck %s, err %v", name, err)
}

// Default time for LB to move the traffic differs for shared/local external traffic policies
var (
hcCheckIntervalSeconds int64
hcUnhealthyThreshold int64
)
if shared {
hcCheckIntervalSeconds = gceSharedHcCheckIntervalSeconds
hcUnhealthyThreshold = gceSharedHcUnhealthyThreshold
} else {
hcCheckIntervalSeconds = gceLocalHcCheckIntervalSeconds
hcUnhealthyThreshold = gceLocalHcUnhealthyThreshold
}

return &composite.HealthCheck{
Name: name,
CheckIntervalSec: gceHcCheckIntervalSeconds,
CheckIntervalSec: hcCheckIntervalSeconds,
TimeoutSec: gceHcTimeoutSeconds,
HealthyThreshold: gceHcHealthyThreshold,
UnhealthyThreshold: gceHcUnhealthyThreshold,
UnhealthyThreshold: hcUnhealthyThreshold,
HttpHealthCheck: &httpSettings,
Type: "HTTP",
Description: desc,
Expand Down
88 changes: 63 additions & 25 deletions pkg/healthchecksl4/healthchecksl4_test.go
View file
Original file line number Diff line number Diff line change
Expand Up @@ -29,6 +29,7 @@ func TestMergeHealthChecks(t *testing.T) {
t.Parallel()
for _, tc := range []struct {
desc string
shared bool
checkIntervalSec int64
timeoutSec int64
healthyThreshold int64
Expand All @@ -38,19 +39,24 @@ func TestMergeHealthChecks(t *testing.T) {
wantHealthyThreshold int64
wantUnhealthyThreshold int64
}{
{"unchanged", gceHcCheckIntervalSeconds, gceHcTimeoutSeconds, gceHcHealthyThreshold, gceHcUnhealthyThreshold, gceHcCheckIntervalSeconds, gceHcTimeoutSeconds, gceHcHealthyThreshold, gceHcUnhealthyThreshold},
{"interval - too small - should reconcile", gceHcCheckIntervalSeconds - 1, gceHcTimeoutSeconds, gceHcHealthyThreshold, gceHcUnhealthyThreshold, gceHcCheckIntervalSeconds, gceHcTimeoutSeconds, gceHcHealthyThreshold, gceHcUnhealthyThreshold},
{"timeout - too small - should reconcile", gceHcCheckIntervalSeconds, gceHcTimeoutSeconds - 1, gceHcHealthyThreshold, gceHcUnhealthyThreshold, gceHcCheckIntervalSeconds, gceHcTimeoutSeconds, gceHcHealthyThreshold, gceHcUnhealthyThreshold},
{"healthy threshold - too small - should reconcile", gceHcCheckIntervalSeconds, gceHcTimeoutSeconds, gceHcHealthyThreshold - 1, gceHcUnhealthyThreshold, gceHcCheckIntervalSeconds, gceHcTimeoutSeconds, gceHcHealthyThreshold, gceHcUnhealthyThreshold},
{"unhealthy threshold - too small - should reconcile", gceHcCheckIntervalSeconds, gceHcTimeoutSeconds, gceHcHealthyThreshold, gceHcUnhealthyThreshold - 1, gceHcCheckIntervalSeconds, gceHcTimeoutSeconds, gceHcHealthyThreshold, gceHcUnhealthyThreshold},
{"interval - user configured - should keep", gceHcCheckIntervalSeconds + 1, gceHcTimeoutSeconds, gceHcHealthyThreshold, gceHcUnhealthyThreshold, gceHcCheckIntervalSeconds + 1, gceHcTimeoutSeconds, gceHcHealthyThreshold, gceHcUnhealthyThreshold},
{"timeout - user configured - should keep", gceHcCheckIntervalSeconds, gceHcTimeoutSeconds + 1, gceHcHealthyThreshold, gceHcUnhealthyThreshold, gceHcCheckIntervalSeconds, gceHcTimeoutSeconds + 1, gceHcHealthyThreshold, gceHcUnhealthyThreshold},
{"healthy threshold - user configured - should keep", gceHcCheckIntervalSeconds, gceHcTimeoutSeconds, gceHcHealthyThreshold + 1, gceHcUnhealthyThreshold, gceHcCheckIntervalSeconds, gceHcTimeoutSeconds, gceHcHealthyThreshold + 1, gceHcUnhealthyThreshold},
{"unhealthy threshold - user configured - should keep", gceHcCheckIntervalSeconds, gceHcTimeoutSeconds, gceHcHealthyThreshold, gceHcUnhealthyThreshold + 1, gceHcCheckIntervalSeconds, gceHcTimeoutSeconds, gceHcHealthyThreshold, gceHcUnhealthyThreshold + 1},
{"unchanged (sharedHc)", true, gceSharedHcCheckIntervalSeconds, gceHcTimeoutSeconds, gceHcHealthyThreshold, gceSharedHcUnhealthyThreshold, gceSharedHcCheckIntervalSeconds, gceHcTimeoutSeconds, gceHcHealthyThreshold, gceSharedHcUnhealthyThreshold},
{"unchanged (localHc)", false, gceLocalHcCheckIntervalSeconds, gceHcTimeoutSeconds, gceHcHealthyThreshold, gceLocalHcUnhealthyThreshold, gceLocalHcCheckIntervalSeconds, gceHcTimeoutSeconds, gceHcHealthyThreshold, gceLocalHcUnhealthyThreshold},
{"interval - too small - should reconcile (sharedHc)", true, gceSharedHcCheckIntervalSeconds - 1, gceHcTimeoutSeconds, gceHcHealthyThreshold, gceSharedHcUnhealthyThreshold, gceSharedHcCheckIntervalSeconds, gceHcTimeoutSeconds, gceHcHealthyThreshold, gceSharedHcUnhealthyThreshold},
{"interval - too small - should reconcile (localHc)", false, gceLocalHcCheckIntervalSeconds - 1, gceHcTimeoutSeconds, gceHcHealthyThreshold, gceLocalHcUnhealthyThreshold, gceLocalHcCheckIntervalSeconds, gceHcTimeoutSeconds, gceHcHealthyThreshold, gceLocalHcUnhealthyThreshold},
{"timeout - too small - should reconcile (sharedHc)", true, gceSharedHcCheckIntervalSeconds, gceHcTimeoutSeconds - 1, gceHcHealthyThreshold, gceSharedHcUnhealthyThreshold, gceSharedHcCheckIntervalSeconds, gceHcTimeoutSeconds, gceHcHealthyThreshold, gceSharedHcUnhealthyThreshold},
{"healthy threshold - too small - should reconcile (sharedHc)", true, gceSharedHcCheckIntervalSeconds, gceHcTimeoutSeconds, gceHcHealthyThreshold - 1, gceSharedHcUnhealthyThreshold, gceSharedHcCheckIntervalSeconds, gceHcTimeoutSeconds, gceHcHealthyThreshold, gceSharedHcUnhealthyThreshold},
{"unhealthy threshold - too small - should reconcile (sharedHc)", true, gceSharedHcCheckIntervalSeconds, gceHcTimeoutSeconds, gceHcHealthyThreshold, gceSharedHcUnhealthyThreshold - 1, gceSharedHcCheckIntervalSeconds, gceHcTimeoutSeconds, gceHcHealthyThreshold, gceSharedHcUnhealthyThreshold},
{"unhealthy threshold - too small - should reconcile (localHc)", false, gceLocalHcCheckIntervalSeconds, gceHcTimeoutSeconds, gceHcHealthyThreshold, gceLocalHcUnhealthyThreshold - 1, gceLocalHcCheckIntervalSeconds, gceHcTimeoutSeconds, gceHcHealthyThreshold, gceLocalHcUnhealthyThreshold},
{"interval - user configured - should keep (sharedHc)", true, gceSharedHcCheckIntervalSeconds + 1, gceHcTimeoutSeconds, gceHcHealthyThreshold, gceSharedHcUnhealthyThreshold, gceSharedHcCheckIntervalSeconds + 1, gceHcTimeoutSeconds, gceHcHealthyThreshold, gceSharedHcUnhealthyThreshold},
{"interval - user configured - should keep (localHc)", false, gceLocalHcCheckIntervalSeconds + 1, gceHcTimeoutSeconds, gceHcHealthyThreshold, gceLocalHcUnhealthyThreshold, gceLocalHcCheckIntervalSeconds + 1, gceHcTimeoutSeconds, gceHcHealthyThreshold, gceLocalHcUnhealthyThreshold},
{"timeout - user configured - should keep", true, gceSharedHcCheckIntervalSeconds, gceHcTimeoutSeconds + 1, gceHcHealthyThreshold, gceSharedHcUnhealthyThreshold, gceSharedHcCheckIntervalSeconds, gceHcTimeoutSeconds + 1, gceHcHealthyThreshold, gceSharedHcUnhealthyThreshold},
{"healthy threshold - user configured - should keep (sharedHc)", true, gceSharedHcCheckIntervalSeconds, gceHcTimeoutSeconds, gceHcHealthyThreshold + 1, gceSharedHcUnhealthyThreshold, gceSharedHcCheckIntervalSeconds, gceHcTimeoutSeconds, gceHcHealthyThreshold + 1, gceSharedHcUnhealthyThreshold},
{"unhealthy threshold - user configured - should keep (sharedHc)", true, gceSharedHcCheckIntervalSeconds, gceHcTimeoutSeconds, gceHcHealthyThreshold, gceSharedHcUnhealthyThreshold + 1, gceSharedHcCheckIntervalSeconds, gceHcTimeoutSeconds, gceHcHealthyThreshold, gceSharedHcUnhealthyThreshold + 1},
{"unhealthy threshold - user configured - should keep (localHc)", false, gceLocalHcCheckIntervalSeconds, gceHcTimeoutSeconds, gceHcHealthyThreshold, gceLocalHcUnhealthyThreshold + 1, gceLocalHcCheckIntervalSeconds, gceHcTimeoutSeconds, gceHcHealthyThreshold, gceLocalHcUnhealthyThreshold + 1},
} {
t.Run(tc.desc, func(t *testing.T) {
// healthcheck intervals and thresholds are common for Global and Regional healthchecks. Hence testing only Global case.
wantHC := newL4HealthCheck("hc", types.NamespacedName{Name: "svc", Namespace: "default"}, false, "/", 12345, utils.ILB, meta.Global, "")
wantHC := newL4HealthCheck("hc", types.NamespacedName{Name: "svc", Namespace: "default"}, tc.shared, "/", 12345, utils.ILB, meta.Global, "")
hc := &composite.HealthCheck{
CheckIntervalSec: tc.checkIntervalSec,
TimeoutSec: tc.timeoutSec,
Expand Down Expand Up @@ -78,27 +84,33 @@ func TestCompareHealthChecks(t *testing.T) {
t.Parallel()
for _, tc := range []struct {
desc string
shared bool
modifier func(*composite.HealthCheck)
wantChanged bool
}{
{"unchanged", nil, false},
{"nil HttpHealthCheck", func(hc *composite.HealthCheck) { hc.HttpHealthCheck = nil }, true},
{"desc does not match", func(hc *composite.HealthCheck) { hc.Description = "bad-desc" }, true},
{"port does not match", func(hc *composite.HealthCheck) { hc.HttpHealthCheck.Port = 54321 }, true},
{"requestPath does not match", func(hc *composite.HealthCheck) { hc.HttpHealthCheck.RequestPath = "/anotherone" }, true},
{"interval needs update", func(hc *composite.HealthCheck) { hc.CheckIntervalSec = gceHcCheckIntervalSeconds - 1 }, true},
{"timeout needs update", func(hc *composite.HealthCheck) { hc.TimeoutSec = gceHcTimeoutSeconds - 1 }, true},
{"healthy threshold needs update", func(hc *composite.HealthCheck) { hc.HealthyThreshold = gceHcHealthyThreshold - 1 }, true},
{"unhealthy threshold needs update", func(hc *composite.HealthCheck) { hc.UnhealthyThreshold = gceHcUnhealthyThreshold - 1 }, true},
{"interval does not need update", func(hc *composite.HealthCheck) { hc.CheckIntervalSec = gceHcCheckIntervalSeconds + 1 }, false},
{"timeout does not need update", func(hc *composite.HealthCheck) { hc.TimeoutSec = gceHcTimeoutSeconds + 1 }, false},
{"healthy threshold does not need update", func(hc *composite.HealthCheck) { hc.HealthyThreshold = gceHcHealthyThreshold + 1 }, false},
{"unhealthy threshold does not need update", func(hc *composite.HealthCheck) { hc.UnhealthyThreshold = gceHcUnhealthyThreshold + 1 }, false},
{"unchanged (sharedHc)", true, nil, false},
{"unchanged (localHc)", false, nil, false},
{"nil HttpHealthCheck (sharedHc)", true, func(hc *composite.HealthCheck) { hc.HttpHealthCheck = nil }, true},
{"desc does not match (sharedHc)", true, func(hc *composite.HealthCheck) { hc.Description = "bad-desc" }, true},
{"port does not match (sharedHc)", true, func(hc *composite.HealthCheck) { hc.HttpHealthCheck.Port = 54321 }, true},
{"requestPath does not match (sharedHc)", true, func(hc *composite.HealthCheck) { hc.HttpHealthCheck.RequestPath = "/anotherone" }, true},
{"interval needs update (sharedHc)", true, func(hc *composite.HealthCheck) { hc.CheckIntervalSec = gceSharedHcCheckIntervalSeconds - 1 }, true},
{"interval needs update (localHc)", false, func(hc *composite.HealthCheck) { hc.CheckIntervalSec = gceLocalHcCheckIntervalSeconds - 1 }, true},
{"timeout needs update (sharedHc)", true, func(hc *composite.HealthCheck) { hc.TimeoutSec = gceHcTimeoutSeconds - 1 }, true},
{"healthy threshold needs update (sharedHc)", true, func(hc *composite.HealthCheck) { hc.HealthyThreshold = gceHcHealthyThreshold - 1 }, true},
{"unhealthy threshold needs update (sharedHc)", true, func(hc *composite.HealthCheck) { hc.UnhealthyThreshold = gceSharedHcUnhealthyThreshold - 1 }, true},
{"unhealthy threshold needs update (localHc)", false, func(hc *composite.HealthCheck) { hc.UnhealthyThreshold = gceLocalHcUnhealthyThreshold - 1 }, true},
{"interval does not need update (sharedHc)", true, func(hc *composite.HealthCheck) { hc.CheckIntervalSec = gceSharedHcCheckIntervalSeconds + 1 }, false},
{"interval does not need update (localHc)", false, func(hc *composite.HealthCheck) { hc.CheckIntervalSec = gceLocalHcCheckIntervalSeconds + 1 }, false},
{"timeout does not need update (sharedHc)", true, func(hc *composite.HealthCheck) { hc.TimeoutSec = gceHcTimeoutSeconds + 1 }, false},
{"healthy threshold does not need update (sharedHc)", true, func(hc *composite.HealthCheck) { hc.HealthyThreshold = gceHcHealthyThreshold + 1 }, false},
{"unhealthy threshold does not need update (sharedHc)", true, func(hc *composite.HealthCheck) { hc.UnhealthyThreshold = gceSharedHcUnhealthyThreshold + 1 }, false},
{"unhealthy threshold does not need update (localHc)", false, func(hc *composite.HealthCheck) { hc.UnhealthyThreshold = gceLocalHcUnhealthyThreshold + 1 }, false},
} {
t.Run(tc.desc, func(t *testing.T) {
// healthcheck intervals and thresholds are common for Global and Regional healthchecks. Hence testing only Global case.
hc := newL4HealthCheck("hc", types.NamespacedName{Name: "svc", Namespace: "default"}, false, "/", 12345, utils.ILB, meta.Global, "")
wantHC := newL4HealthCheck("hc", types.NamespacedName{Name: "svc", Namespace: "default"}, false, "/", 12345, utils.ILB, meta.Global, "")
hc := newL4HealthCheck("hc", types.NamespacedName{Name: "svc", Namespace: "default"}, tc.shared, "/", 12345, utils.ILB, meta.Global, "")
wantHC := newL4HealthCheck("hc", types.NamespacedName{Name: "svc", Namespace: "default"}, tc.shared, "/", 12345, utils.ILB, meta.Global, "")
if tc.modifier != nil {
tc.modifier(hc)
}
Expand All @@ -109,6 +121,32 @@ func TestCompareHealthChecks(t *testing.T) {
}
}

// Checks that correct health check constants used for different traffic policies types (local/shared)
func TestSharedHealthChecks(t *testing.T) {
t.Parallel()
for _, tc := range []struct {
desc string
shared bool
wantCheckIntervalSec int64
wantUnhealthyThreshold int64
}{
{"shared", true, gceSharedHcCheckIntervalSeconds, gceSharedHcUnhealthyThreshold},
{"local", false, gceLocalHcCheckIntervalSeconds, gceLocalHcUnhealthyThreshold},
} {
t.Run(tc.desc, func(t *testing.T) {
// healthcheck intervals and thresholds are common for Global and Regional healthchecks. Hence testing only Global case.
gotHC := newL4HealthCheck("hc", types.NamespacedName{Name: "svc", Namespace: "default"}, tc.shared, "/", 12345, utils.ILB, meta.Global, "")

if gotHC.CheckIntervalSec != tc.wantCheckIntervalSec {
t.Errorf("gotHC.CheckIntervalSec = %d; want %d", gotHC.CheckIntervalSec, tc.wantCheckIntervalSec)
}
if gotHC.UnhealthyThreshold != tc.wantUnhealthyThreshold {
t.Errorf("gotHC.UnhealthyThreshold = %d; want %d", gotHC.UnhealthyThreshold, tc.wantUnhealthyThreshold)
}
})
}
}

func TestNewHealthCheck(t *testing.T) {
t.Parallel()
namespaceName := types.NamespacedName{Name: "svc", Namespace: "default"}
Expand Down

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