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FleetAutoscaler can be targeted at Non Existent Fleets
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This removes some previous restrictions with the FleetAutoscaler,
as well as cleaning up a couple of items.

- FleetAutoscalers can now have a Fleet target that doesn't exit.
  - If the target doesn't exist, this will be recorded as a warning event
    of type `FailedGetFleet`, rather than `ScalingLimited` status item,
    as it allows a human readable message, as well as give us data on how
    often this occurs, and it is readable by stat/alerting packages.
- FleetAutoscalers can now have their Fleet target edited. This
  means that FleetAutoscalers can be transitioned from one Fleet
  to another. This may be useful in scenarios like red-green deployments, or
  if you wish to temporarily disable an Autoscaler, but not delete it.
- `FleetAutoscaler.Status.ScalingLimited` was also replaced by a `ScalingLimited`
  Event, as it allows a human readable message, as well as give us data on how
  often this occurs, and it is readable by stat/alerting packages.

Closes #406
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@markmandel
markmandel committed Nov 15, 2018
1 parent 88adba4 commit 75f01bd
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Showing 7 changed files with 125 additions and 362 deletions.
1 change: 0 additions & 1 deletion install/helm/agones/templates/admissionregistration.yaml
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Original file line number Diff line number Diff line change
Expand Up @@ -86,7 +86,6 @@ webhooks:
- "gameservers"
- "fleets"
- "fleetallocations"
- "fleetautoscalers"
apiVersions:
- "v1alpha1"
operations:
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1 change: 0 additions & 1 deletion install/yaml/install.yaml
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Original file line number Diff line number Diff line change
Expand Up @@ -925,7 +925,6 @@ webhooks:
- "gameservers"
- "fleets"
- "fleetallocations"
- "fleetautoscalers"
apiVersions:
- "v1alpha1"
operations:
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24 changes: 2 additions & 22 deletions pkg/apis/stable/v1alpha1/fleetautoscaler.go
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Original file line number Diff line number Diff line change
Expand Up @@ -105,30 +105,10 @@ type FleetAutoscalerStatus struct {
// lastScaleTime is the last time the FleetAutoscaler scaled the attached fleet,
// +optional
LastScaleTime *metav1.Time `json:"lastScaleTime"`

// AbleToScale indicates that we can access the target fleet
AbleToScale bool `json:"ableToScale"`

// ScalingLimited indicates that the calculated scale would be above or below the range
// defined by MinReplicas and MaxReplicas, and has thus been capped.
ScalingLimited bool `json:"scalingLimited"`
}

// ValidateUpdate validates when an update occurs
func (fas *FleetAutoscaler) ValidateUpdate(new *FleetAutoscaler, causes []metav1.StatusCause) []metav1.StatusCause {
if fas.Spec.FleetName != new.Spec.FleetName {
causes = append(causes, metav1.StatusCause{
Type: metav1.CauseTypeFieldValueInvalid,
Field: "fleetName",
Message: "fleetName cannot be updated",
})
}

return new.ValidateAutoScalingSettings(causes)
}

// ValidateAutoScalingSettings validates the FleetAutoscaler scaling settings
func (fas *FleetAutoscaler) ValidateAutoScalingSettings(causes []metav1.StatusCause) []metav1.StatusCause {
// Validate validates the FleetAutoscaler scaling settings
func (fas *FleetAutoscaler) Validate(causes []metav1.StatusCause) []metav1.StatusCause {
if fas.Spec.Policy.Type == BufferPolicyType {
causes = fas.Spec.Policy.Buffer.ValidateAutoScalingBufferPolicy(causes)
}
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188 changes: 36 additions & 152 deletions pkg/apis/stable/v1alpha1/fleetautoscaler_test.go
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Expand Up @@ -25,209 +25,93 @@ import (
func TestFleetAutoscalerValidateUpdate(t *testing.T) {
t.Parallel()

t.Run("same fleet name", func(t *testing.T) {

fas := &FleetAutoscaler{
ObjectMeta: metav1.ObjectMeta{Name: "test"},
Spec: FleetAutoscalerSpec{
FleetName: "testing",
Policy: FleetAutoscalerPolicy{
Type: BufferPolicyType,
Buffer: &BufferPolicy{
BufferSize: intstr.FromInt(1),
MaxReplicas: 10,
},
},
},
}

causes := fas.ValidateUpdate(fas.DeepCopy(), nil)
assert.Len(t, causes, 0)
})

t.Run("different fleet name", func(t *testing.T) {

fas := &FleetAutoscaler{
ObjectMeta: metav1.ObjectMeta{Name: "test"},
Spec: FleetAutoscalerSpec{
FleetName: "testing",
Policy: FleetAutoscalerPolicy{
Type: BufferPolicyType,
Buffer: &BufferPolicy{
BufferSize: intstr.FromInt(1),
MaxReplicas: 10,
},
},
},
}
fasCopy := fas.DeepCopy()
fasCopy.Spec.FleetName = "notthesame"

causes := fas.ValidateUpdate(fasCopy, nil)

assert.Len(t, causes, 1)
assert.Equal(t, "fleetName", causes[0].Field)
})

t.Run("bad buffer size", func(t *testing.T) {

fas := &FleetAutoscaler{
ObjectMeta: metav1.ObjectMeta{Name: "test"},
Spec: FleetAutoscalerSpec{
FleetName: "testing",
Policy: FleetAutoscalerPolicy{
Type: BufferPolicyType,
Buffer: &BufferPolicy{
BufferSize: intstr.FromInt(1),
MaxReplicas: 10,
},
},
},
}

fasCopy := fas.DeepCopy()
fasCopy.Spec.Policy.Buffer.BufferSize = intstr.FromInt(0)

causes := fas.ValidateUpdate(fasCopy, nil)
fas := defaultFixture()
fas.Spec.Policy.Buffer.BufferSize = intstr.FromInt(0)
causes := fas.Validate(nil)

assert.Len(t, causes, 1)
assert.Equal(t, "bufferSize", causes[0].Field)
})

t.Run("bad min replicas", func(t *testing.T) {

fas := &FleetAutoscaler{
ObjectMeta: metav1.ObjectMeta{Name: "test"},
Spec: FleetAutoscalerSpec{
FleetName: "testing",
Policy: FleetAutoscalerPolicy{
Type: BufferPolicyType,
Buffer: &BufferPolicy{
BufferSize: intstr.FromInt(5),
MaxReplicas: 10,
},
},
},
}

fasCopy := fas.DeepCopy()
fasCopy.Spec.Policy.Buffer.MinReplicas = 2
fas := defaultFixture()
fas.Spec.Policy.Buffer.MinReplicas = 2

causes := fas.ValidateUpdate(fasCopy, nil)
causes := fas.Validate(nil)

assert.Len(t, causes, 1)
assert.Equal(t, "minReplicas", causes[0].Field)
})

t.Run("bad max replicas", func(t *testing.T) {

fas := &FleetAutoscaler{
ObjectMeta: metav1.ObjectMeta{Name: "test"},
Spec: FleetAutoscalerSpec{
FleetName: "testing",
Policy: FleetAutoscalerPolicy{
Type: BufferPolicyType,
Buffer: &BufferPolicy{
BufferSize: intstr.FromInt(5),
MaxReplicas: 10,
},
},
},
}

fasCopy := fas.DeepCopy()
fasCopy.Spec.Policy.Buffer.MaxReplicas = 2
causes := fas.ValidateUpdate(fasCopy, nil)
fas := defaultFixture()
fas.Spec.Policy.Buffer.MaxReplicas = 2
causes := fas.Validate(nil)

assert.Len(t, causes, 1)
assert.Equal(t, "maxReplicas", causes[0].Field)
})

t.Run("minReplicas > maxReplicas", func(t *testing.T) {

fas := &FleetAutoscaler{
ObjectMeta: metav1.ObjectMeta{Name: "test"},
Spec: FleetAutoscalerSpec{
FleetName: "testing",
Policy: FleetAutoscalerPolicy{
Type: BufferPolicyType,
Buffer: &BufferPolicy{
BufferSize: intstr.FromInt(5),
MaxReplicas: 10,
},
},
},
}

fasCopy := fas.DeepCopy()
fasCopy.Spec.Policy.Buffer.MinReplicas = 20
causes := fas.ValidateUpdate(fasCopy, nil)
fas := defaultFixture()
fas.Spec.Policy.Buffer.MinReplicas = 20
causes := fas.Validate(nil)

assert.Len(t, causes, 1)
assert.Equal(t, "minReplicas", causes[0].Field)
})

t.Run("bufferSize good percent", func(t *testing.T) {

fas := &FleetAutoscaler{
ObjectMeta: metav1.ObjectMeta{Name: "test"},
Spec: FleetAutoscalerSpec{
FleetName: "testing",
Policy: FleetAutoscalerPolicy{
Type: BufferPolicyType,
Buffer: &BufferPolicy{
BufferSize: intstr.FromInt(5),
MaxReplicas: 10,
},
},
},
}

fasCopy := fas.DeepCopy()
fasCopy.Spec.Policy.Buffer.BufferSize = intstr.FromString("20%")
causes := fas.ValidateUpdate(fasCopy, nil)
fas := defaultFixture()
fas.Spec.Policy.Buffer.BufferSize = intstr.FromString("20%")
causes := fas.Validate(nil)

assert.Len(t, causes, 0)
})

t.Run("bufferSize bad percent", func(t *testing.T) {

fas := &FleetAutoscaler{
ObjectMeta: metav1.ObjectMeta{Name: "test"},
Spec: FleetAutoscalerSpec{
FleetName: "testing",
Policy: FleetAutoscalerPolicy{
Type: BufferPolicyType,
Buffer: &BufferPolicy{
BufferSize: intstr.FromInt(5),
MaxReplicas: 10,
},
},
},
}
fas := defaultFixture()

fasCopy := fas.DeepCopy()
fasCopy.Spec.Policy.Buffer.BufferSize = intstr.FromString("120%")
causes := fas.ValidateUpdate(fasCopy, nil)
causes := fasCopy.Validate(nil)
assert.Len(t, causes, 1)
assert.Equal(t, "bufferSize", causes[0].Field)

fasCopy = fas.DeepCopy()
fasCopy.Spec.Policy.Buffer.BufferSize = intstr.FromString("0%")
causes = fas.ValidateUpdate(fasCopy, nil)
causes = fasCopy.Validate(nil)
assert.Len(t, causes, 1)
assert.Equal(t, "bufferSize", causes[0].Field)

fasCopy = fas.DeepCopy()
fasCopy.Spec.Policy.Buffer.BufferSize = intstr.FromString("-10%")
causes = fas.ValidateUpdate(fasCopy, nil)
causes = fasCopy.Validate(nil)
assert.Len(t, causes, 1)
assert.Equal(t, "bufferSize", causes[0].Field)
fasCopy = fas.DeepCopy()

fasCopy.Spec.Policy.Buffer.BufferSize = intstr.FromString("notgood")
causes = fas.ValidateUpdate(fasCopy, nil)
causes = fasCopy.Validate(nil)
assert.Len(t, causes, 1)
assert.Equal(t, "bufferSize", causes[0].Field)
})
}

func defaultFixture() *FleetAutoscaler {
return &FleetAutoscaler{
ObjectMeta: metav1.ObjectMeta{Name: "test"},
Spec: FleetAutoscalerSpec{
FleetName: "testing",
Policy: FleetAutoscalerPolicy{
Type: BufferPolicyType,
Buffer: &BufferPolicy{
BufferSize: intstr.FromInt(5),
MaxReplicas: 10,
},
},
},
}
}
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