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[Regression] Fleet scale down didn't adhere to Packed Scheduling
The new Fleet scale up/scale down performance enhancements removed the functionality that the `Packed` strategy is documented to provide -- when scaling down, removing GameServers from least used Nodes first. This change implements a library for GameServer sorting that doesn't use reflection, unlike sort.Slice (much faster), and can be used with any Comparator, as I expect we'll likely need this again. To maintain performance as well, the set of GameServers only get sorted when scaling down, and only for Packed strategy.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,50 @@ | ||
| // Copyright 2019 Google Inc. All Rights Reserved. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
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| package v1alpha1 | ||
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| import "sort" | ||
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| // GameServerSort sorts gameservers, based on a comparator | ||
| type GameServerSort struct { | ||
| // List is the GameServer list to sort | ||
| List []*GameServer | ||
| // Less is the comparator function to use as a sorting function. | ||
| // returns true if a < b | ||
| Comparator func(a, b *GameServer) bool | ||
| } | ||
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| // Sort sorts the underlying Array and returns it | ||
| func (g *GameServerSort) Sort() []*GameServer { | ||
| sort.Sort(g) | ||
| return g.List | ||
| } | ||
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| // Len is the Len function for sort.Interface | ||
| func (g *GameServerSort) Len() int { | ||
| return len(g.List) | ||
| } | ||
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| // Less is the Less function for sort.Interface | ||
| func (g *GameServerSort) Less(i, j int) bool { | ||
| a := g.List[i] | ||
| b := g.List[j] | ||
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| return g.Comparator(a, b) | ||
| } | ||
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| // Swap is the swap function for sort.Interface | ||
| func (g *GameServerSort) Swap(i, j int) { | ||
| g.List[j], g.List[i] = g.List[i], g.List[j] | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,37 @@ | ||
| // Copyright 2019 Google Inc. All Rights Reserved. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
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| package v1alpha1 | ||
|
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| import ( | ||
| "testing" | ||
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| "github.com/stretchr/testify/assert" | ||
| metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" | ||
| ) | ||
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| func TestGameServerSortSort(t *testing.T) { | ||
| list := []*GameServer{{ObjectMeta: metav1.ObjectMeta{Name: "c"}}, | ||
| {ObjectMeta: metav1.ObjectMeta{Name: "b"}}, {ObjectMeta: metav1.ObjectMeta{Name: "a"}}} | ||
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| sort := GameServerSort{list, func(a, b *GameServer) bool { | ||
| return a.ObjectMeta.Name < b.ObjectMeta.Name | ||
| }} | ||
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| result := sort.Sort() | ||
| assert.Len(t, result, len(list)) | ||
| assert.Equal(t, "a", result[0].ObjectMeta.Name) | ||
| assert.Equal(t, "b", result[1].ObjectMeta.Name) | ||
| assert.Equal(t, "c", result[2].ObjectMeta.Name) | ||
| } |
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