diff --git a/balancer/go.mod b/balancer/go.mod new file mode 100644 index 000000000000..53f721c80917 --- /dev/null +++ b/balancer/go.mod @@ -0,0 +1,55 @@ +module k8s.io/autoscaling/balancer + +go 1.19 + +require ( + github.com/stretchr/testify v1.8.0 + k8s.io/api v0.25.2 + k8s.io/apimachinery v0.25.2 + k8s.io/client-go v0.25.2 + k8s.io/klog/v2 v2.70.1 +) + +require ( + github.com/PuerkitoBio/purell v1.1.1 // indirect + github.com/PuerkitoBio/urlesc v0.0.0-20170810143723-de5bf2ad4578 // indirect + github.com/davecgh/go-spew v1.1.1 // indirect + github.com/emicklei/go-restful/v3 v3.8.0 // indirect + github.com/evanphx/json-patch v4.12.0+incompatible // indirect + github.com/go-logr/logr v1.2.3 // indirect + github.com/go-openapi/jsonpointer v0.19.5 // indirect + github.com/go-openapi/jsonreference v0.19.5 // indirect + github.com/go-openapi/swag v0.19.14 // indirect + github.com/gogo/protobuf v1.3.2 // indirect + github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da // indirect + github.com/golang/protobuf v1.5.2 // indirect + github.com/google/gnostic v0.5.7-v3refs // indirect + github.com/google/go-cmp v0.5.8 // indirect + github.com/google/gofuzz v1.2.0 // indirect + github.com/imdario/mergo v0.3.6 // indirect + github.com/josharian/intern v1.0.0 // indirect + github.com/json-iterator/go v1.1.12 // indirect + github.com/mailru/easyjson v0.7.6 // indirect + github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect + github.com/modern-go/reflect2 v1.0.2 // indirect + github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect + github.com/pkg/errors v0.9.1 // indirect + github.com/pmezard/go-difflib v1.0.0 // indirect + github.com/spf13/pflag v1.0.5 // indirect + golang.org/x/net v0.0.0-20220722155237-a158d28d115b // indirect + golang.org/x/oauth2 v0.0.0-20211104180415-d3ed0bb246c8 // indirect + golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f // indirect + golang.org/x/term v0.0.0-20210927222741-03fcf44c2211 // indirect + golang.org/x/text v0.3.7 // indirect + golang.org/x/time v0.0.0-20220210224613-90d013bbcef8 // indirect + google.golang.org/appengine v1.6.7 // indirect + google.golang.org/protobuf v1.28.0 // indirect + gopkg.in/inf.v0 v0.9.1 // indirect + gopkg.in/yaml.v2 v2.4.0 // indirect + gopkg.in/yaml.v3 v3.0.1 // indirect + k8s.io/kube-openapi v0.0.0-20220803162953-67bda5d908f1 // indirect + k8s.io/utils v0.0.0-20220823124924-e9cbc92d1a73 // indirect + sigs.k8s.io/json v0.0.0-20220713155537-f223a00ba0e2 // indirect + sigs.k8s.io/structured-merge-diff/v4 v4.2.3 // indirect + sigs.k8s.io/yaml v1.3.0 // indirect +) diff --git a/balancer/go.sum b/balancer/go.sum new file mode 100644 index 000000000000..3d492bb9e886 --- /dev/null +++ b/balancer/go.sum @@ -0,0 +1,490 @@ +cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU= +cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU= +cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY= +cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc= +cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0= +cloud.google.com/go v0.50.0/go.mod h1:r9sluTvynVuxRIOHXQEHMFffphuXHOMZMycpNR5e6To= +cloud.google.com/go v0.52.0/go.mod h1:pXajvRH/6o3+F9jDHZWQ5PbGhn+o8w9qiu/CffaVdO4= +cloud.google.com/go v0.53.0/go.mod h1:fp/UouUEsRkN6ryDKNW/Upv/JBKnv6WDthjR6+vze6M= +cloud.google.com/go v0.54.0/go.mod h1:1rq2OEkV3YMf6n/9ZvGWI3GWw0VoqH/1x2nd8Is/bPc= +cloud.google.com/go v0.56.0/go.mod h1:jr7tqZxxKOVYizybht9+26Z/gUq7tiRzu+ACVAMbKVk= +cloud.google.com/go v0.57.0/go.mod h1:oXiQ6Rzq3RAkkY7N6t3TcE6jE+CIBBbA36lwQ1JyzZs= +cloud.google.com/go v0.62.0/go.mod h1:jmCYTdRCQuc1PHIIJ/maLInMho30T/Y0M4hTdTShOYc= +cloud.google.com/go v0.65.0/go.mod h1:O5N8zS7uWy9vkA9vayVHs65eM1ubvY4h553ofrNHObY= +cloud.google.com/go/bigquery v1.0.1/go.mod h1:i/xbL2UlR5RvWAURpBYZTtm/cXjCha9lbfbpx4poX+o= +cloud.google.com/go/bigquery v1.3.0/go.mod h1:PjpwJnslEMmckchkHFfq+HTD2DmtT67aNFKH1/VBDHE= +cloud.google.com/go/bigquery v1.4.0/go.mod h1:S8dzgnTigyfTmLBfrtrhyYhwRxG72rYxvftPBK2Dvzc= +cloud.google.com/go/bigquery v1.5.0/go.mod h1:snEHRnqQbz117VIFhE8bmtwIDY80NLUZUMb4Nv6dBIg= +cloud.google.com/go/bigquery v1.7.0/go.mod h1://okPTzCYNXSlb24MZs83e2Do+h+VXtc4gLoIoXIAPc= +cloud.google.com/go/bigquery v1.8.0/go.mod h1:J5hqkt3O0uAFnINi6JXValWIb1v0goeZM77hZzJN/fQ= +cloud.google.com/go/datastore v1.0.0/go.mod h1:LXYbyblFSglQ5pkeyhO+Qmw7ukd3C+pD7TKLgZqpHYE= +cloud.google.com/go/datastore v1.1.0/go.mod h1:umbIZjpQpHh4hmRpGhH4tLFup+FVzqBi1b3c64qFpCk= +cloud.google.com/go/pubsub v1.0.1/go.mod h1:R0Gpsv3s54REJCy4fxDixWD93lHJMoZTyQ2kNxGRt3I= +cloud.google.com/go/pubsub v1.1.0/go.mod h1:EwwdRX2sKPjnvnqCa270oGRyludottCI76h+R3AArQw= +cloud.google.com/go/pubsub v1.2.0/go.mod h1:jhfEVHT8odbXTkndysNHCcx0awwzvfOlguIAii9o8iA= +cloud.google.com/go/pubsub v1.3.1/go.mod h1:i+ucay31+CNRpDW4Lu78I4xXG+O1r/MAHgjpRVR+TSU= +cloud.google.com/go/storage v1.0.0/go.mod h1:IhtSnM/ZTZV8YYJWCY8RULGVqBDmpoyjwiyrjsg+URw= +cloud.google.com/go/storage v1.5.0/go.mod h1:tpKbwo567HUNpVclU5sGELwQWBDZ8gh0ZeosJ0Rtdos= +cloud.google.com/go/storage v1.6.0/go.mod h1:N7U0C8pVQ/+NIKOBQyamJIeKQKkZ+mxpohlUTyfDhBk= +cloud.google.com/go/storage v1.8.0/go.mod h1:Wv1Oy7z6Yz3DshWRJFhqM/UCfaWIRTdp0RXyy7KQOVs= +cloud.google.com/go/storage v1.10.0/go.mod h1:FLPqc6j+Ki4BU591ie1oL6qBQGu2Bl/tZ9ullr3+Kg0= +dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU= +github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU= +github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo= +github.com/PuerkitoBio/purell v1.1.1 h1:WEQqlqaGbrPkxLJWfBwQmfEAE1Z7ONdDLqrN38tNFfI= +github.com/PuerkitoBio/purell v1.1.1/go.mod h1:c11w/QuzBsJSee3cPx9rAFu61PvFxuPbtSwDGJws/X0= +github.com/PuerkitoBio/urlesc v0.0.0-20170810143723-de5bf2ad4578 h1:d+Bc7a5rLufV/sSk/8dngufqelfh6jnri85riMAaF/M= +github.com/PuerkitoBio/urlesc v0.0.0-20170810143723-de5bf2ad4578/go.mod h1:uGdkoq3SwY9Y+13GIhn11/XLaGBb4BfwItxLd5jeuXE= +github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU= +github.com/chzyer/logex v1.1.10/go.mod h1:+Ywpsq7O8HXn0nuIou7OrIPyXbp3wmkHB+jjWRnGsAI= +github.com/chzyer/readline v0.0.0-20180603132655-2972be24d48e/go.mod h1:nSuG5e5PlCu98SY8svDHJxuZscDgtXS6KTTbou5AhLI= +github.com/chzyer/test v0.0.0-20180213035817-a1ea475d72b1/go.mod h1:Q3SI9o4m/ZMnBNeIyt5eFwwo7qiLfzFZmjNmxjkiQlU= +github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw= +github.com/cncf/udpa/go v0.0.0-20191209042840-269d4d468f6f/go.mod h1:M8M6+tZqaGXZJjfX53e64911xZQV5JYwmTeXPW+k8Sc= +github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E= +github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= +github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c= +github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= +github.com/docopt/docopt-go v0.0.0-20180111231733-ee0de3bc6815/go.mod h1:WwZ+bS3ebgob9U8Nd0kOddGdZWjyMGR8Wziv+TBNwSE= +github.com/emicklei/go-restful/v3 v3.8.0 h1:eCZ8ulSerjdAiaNpF7GxXIE7ZCMo1moN1qX+S609eVw= +github.com/emicklei/go-restful/v3 v3.8.0/go.mod h1:6n3XBCmQQb25CM2LCACGz8ukIrRry+4bhvbpWn3mrbc= +github.com/envoyproxy/go-control-plane v0.9.0/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4= +github.com/envoyproxy/go-control-plane v0.9.1-0.20191026205805-5f8ba28d4473/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4= +github.com/envoyproxy/go-control-plane v0.9.4/go.mod h1:6rpuAdCZL397s3pYoYcLgu1mIlRU8Am5FuJP05cCM98= +github.com/envoyproxy/protoc-gen-validate v0.1.0/go.mod h1:iSmxcyjqTsJpI2R4NaDN7+kN2VEUnK/pcBlmesArF7c= +github.com/evanphx/json-patch v4.12.0+incompatible h1:4onqiflcdA9EOZ4RxV643DvftH5pOlLGNtQ5lPWQu84= +github.com/evanphx/json-patch v4.12.0+incompatible/go.mod h1:50XU6AFN0ol/bzJsmQLiYLvXMP4fmwYFNcr97nuDLSk= +github.com/go-gl/glfw v0.0.0-20190409004039-e6da0acd62b1/go.mod h1:vR7hzQXu2zJy9AVAgeJqvqgH9Q5CA+iKCZ2gyEVpxRU= +github.com/go-gl/glfw/v3.3/glfw v0.0.0-20191125211704-12ad95a8df72/go.mod h1:tQ2UAYgL5IevRw8kRxooKSPJfGvJ9fJQFa0TUsXzTg8= +github.com/go-gl/glfw/v3.3/glfw v0.0.0-20200222043503-6f7a984d4dc4/go.mod h1:tQ2UAYgL5IevRw8kRxooKSPJfGvJ9fJQFa0TUsXzTg8= +github.com/go-logr/logr v0.1.0/go.mod h1:ixOQHD9gLJUVQQ2ZOR7zLEifBX6tGkNJF4QyIY7sIas= +github.com/go-logr/logr v1.2.0/go.mod h1:jdQByPbusPIv2/zmleS9BjJVeZ6kBagPoEUsqbVz/1A= +github.com/go-logr/logr v1.2.3 h1:2DntVwHkVopvECVRSlL5PSo9eG+cAkDCuckLubN+rq0= +github.com/go-logr/logr v1.2.3/go.mod h1:jdQByPbusPIv2/zmleS9BjJVeZ6kBagPoEUsqbVz/1A= +github.com/go-openapi/jsonpointer v0.19.3/go.mod h1:Pl9vOtqEWErmShwVjC8pYs9cog34VGT37dQOVbmoatg= +github.com/go-openapi/jsonpointer v0.19.5 h1:gZr+CIYByUqjcgeLXnQu2gHYQC9o73G2XUeOFYEICuY= +github.com/go-openapi/jsonpointer v0.19.5/go.mod h1:Pl9vOtqEWErmShwVjC8pYs9cog34VGT37dQOVbmoatg= +github.com/go-openapi/jsonreference v0.19.5 h1:1WJP/wi4OjB4iV8KVbH73rQaoialJrqv8gitZLxGLtM= +github.com/go-openapi/jsonreference v0.19.5/go.mod h1:RdybgQwPxbL4UEjuAruzK1x3nE69AqPYEJeo/TWfEeg= +github.com/go-openapi/swag v0.19.5/go.mod h1:POnQmlKehdgb5mhVOsnJFsivZCEZ/vjK9gh66Z9tfKk= +github.com/go-openapi/swag v0.19.14 h1:gm3vOOXfiuw5i9p5N9xJvfjvuofpyvLA9Wr6QfK5Fng= +github.com/go-openapi/swag v0.19.14/go.mod h1:QYRuS/SOXUCsnplDa677K7+DxSOj6IPNl/eQntq43wQ= +github.com/gogo/protobuf v1.3.2 h1:Ov1cvc58UF3b5XjBnZv7+opcTcQFZebYjWzi34vdm4Q= +github.com/gogo/protobuf v1.3.2/go.mod h1:P1XiOD3dCwIKUDQYPy72D8LYyHL2YPYrpS2s69NZV8Q= +github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfUlaOkMMuAQtPIUF8ecWP5IEl/CR7VP2Q= +github.com/golang/groupcache v0.0.0-20190702054246-869f871628b6/go.mod h1:cIg4eruTrX1D+g88fzRXU5OdNfaM+9IcxsU14FzY7Hc= +github.com/golang/groupcache v0.0.0-20191227052852-215e87163ea7/go.mod h1:cIg4eruTrX1D+g88fzRXU5OdNfaM+9IcxsU14FzY7Hc= +github.com/golang/groupcache v0.0.0-20200121045136-8c9f03a8e57e/go.mod h1:cIg4eruTrX1D+g88fzRXU5OdNfaM+9IcxsU14FzY7Hc= +github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da h1:oI5xCqsCo564l8iNU+DwB5epxmsaqB+rhGL0m5jtYqE= +github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da/go.mod h1:cIg4eruTrX1D+g88fzRXU5OdNfaM+9IcxsU14FzY7Hc= +github.com/golang/mock v1.1.1/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A= +github.com/golang/mock v1.2.0/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A= +github.com/golang/mock v1.3.1/go.mod h1:sBzyDLLjw3U8JLTeZvSv8jJB+tU5PVekmnlKIyFUx0Y= +github.com/golang/mock v1.4.0/go.mod h1:UOMv5ysSaYNkG+OFQykRIcU/QvvxJf3p21QfJ2Bt3cw= +github.com/golang/mock v1.4.1/go.mod h1:UOMv5ysSaYNkG+OFQykRIcU/QvvxJf3p21QfJ2Bt3cw= +github.com/golang/mock v1.4.3/go.mod h1:UOMv5ysSaYNkG+OFQykRIcU/QvvxJf3p21QfJ2Bt3cw= +github.com/golang/mock v1.4.4/go.mod h1:l3mdAwkq5BuhzHwde/uurv3sEJeZMXNpwsxVWU71h+4= +github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U= +github.com/golang/protobuf v1.3.1/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U= +github.com/golang/protobuf v1.3.2/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U= +github.com/golang/protobuf v1.3.3/go.mod h1:vzj43D7+SQXF/4pzW/hwtAqwc6iTitCiVSaWz5lYuqw= +github.com/golang/protobuf v1.3.4/go.mod h1:vzj43D7+SQXF/4pzW/hwtAqwc6iTitCiVSaWz5lYuqw= +github.com/golang/protobuf v1.3.5/go.mod h1:6O5/vntMXwX2lRkT1hjjk0nAC1IDOTvTlVgjlRvqsdk= +github.com/golang/protobuf v1.4.0-rc.1/go.mod h1:ceaxUfeHdC40wWswd/P6IGgMaK3YpKi5j83Wpe3EHw8= +github.com/golang/protobuf 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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. +*/ + +package pods + +import ( + "time" + + v1 "k8s.io/api/core/v1" +) + +// Summary contains information about the total observed number of pods within a +// group, number of running, as well as the count of those who failed to +// start within the deadline. +type Summary struct { + // Total is the total observed number of pods that are either running or + // about to be started. + Total int32 + // Running is the number of running pods. + Running int32 + // NotStartedWithinDeadline is the number of pods that not only has not + // fully stared (not scheduled or not fully started, in phase PodPending) + // but also has been in the not started phase for a while. + NotStartedWithinDeadline int32 +} + +// CalculateSummary calculates the Summary structure for the given set of pod +// and startup constraint. +func CalculateSummary(podList []*v1.Pod, now time.Time, startupTimeout time.Duration) Summary { + result := Summary{} + for _, p := range podList { + switch p.Status.Phase { + case v1.PodRunning: + result.Total++ + result.Running++ + break + case v1.PodPending: + result.Total++ + if p.CreationTimestamp.Add(startupTimeout).Before(now) { + result.NotStartedWithinDeadline++ + } + break + } + } + return result +} diff --git a/balancer/pkg/pods/summary_test.go b/balancer/pkg/pods/summary_test.go new file mode 100644 index 000000000000..8e3c34883fb3 --- /dev/null +++ b/balancer/pkg/pods/summary_test.go @@ -0,0 +1,105 @@ +/* +Copyright 2023 The Kubernetes Authors. + +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. +*/ + +package pods + +import ( + "fmt" + "testing" + "time" + + "github.com/stretchr/testify/assert" + v1 "k8s.io/api/core/v1" + metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" +) + +func newPod(name string, phase v1.PodPhase, createTime time.Time) *v1.Pod { + return &v1.Pod{ + ObjectMeta: metav1.ObjectMeta{ + Name: name, + Namespace: "default", + CreationTimestamp: metav1.NewTime(createTime), + }, + Status: v1.PodStatus{ + Phase: phase, + }, + } +} + +func TestCalculateSummary(t *testing.T) { + now := time.Now() + timeout := time.Minute * 5 + + tests := []struct { + name string + pods []*v1.Pod + expected Summary + }{ + { + name: "basic running/pending", + pods: []*v1.Pod{ + newPod("a", v1.PodRunning, now.Add(-time.Hour)), + newPod("a2", v1.PodRunning, now.Add(-time.Hour)), + newPod("b", v1.PodPending, now.Add(-time.Minute)), + }, + expected: Summary{ + Total: 3, + Running: 2, + }, + }, + { + name: "skip completed", + pods: []*v1.Pod{ + newPod("a", v1.PodSucceeded, now.Add(-time.Hour)), + newPod("c", v1.PodFailed, now.Add(-time.Hour)), + }, + expected: Summary{ + Total: 0, + }, + }, + { + name: "deadline", + pods: []*v1.Pod{ + newPod("a", v1.PodPending, now.Add(-time.Hour)), + }, + expected: Summary{ + Total: 1, + NotStartedWithinDeadline: 1, + }, + }, + { + name: "mix", + pods: []*v1.Pod{ + newPod("problem", v1.PodPending, now.Add(-time.Hour)), + newPod("b", v1.PodRunning, now.Add(-time.Hour)), + newPod("b2", v1.PodRunning, now.Add(-time.Hour)), + newPod("c", v1.PodFailed, now.Add(-time.Hour)), + }, + expected: Summary{ + Total: 3, + Running: 2, + NotStartedWithinDeadline: 1, + }, + }, + } + + for i, tc := range tests { + t.Run(fmt.Sprintf("%d: %s", i, tc.name), func(t *testing.T) { + result := CalculateSummary(tc.pods, now, timeout) + assert.Equal(t, tc.expected, result) + }) + } +} diff --git a/balancer/pkg/policy/policy.go b/balancer/pkg/policy/policy.go new file mode 100644 index 000000000000..4c5699473dc0 --- /dev/null +++ b/balancer/pkg/policy/policy.go @@ -0,0 +1,55 @@ +/* +Copyright 2023 The Kubernetes Authors. + +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. +*/ + +package policy + +import ( + "fmt" + "k8s.io/autoscaling/balancer/pkg/apis/balancer.x-k8s.io/v1alpha1" + "k8s.io/autoscaling/balancer/pkg/pods" +) + +// GetPlacement calculates the placement for the given balancer and pod summary +// information for individual balancer targets. +func GetPlacement(balancer *v1alpha1.Balancer, summaries map[string]pods.Summary) (ReplicaPlacement, PlacementProblems, error) { + targetMap := buildTargetMap(balancer.Spec.Targets) + switch balancer.Spec.Policy.PolicyName { + case v1alpha1.PriorityPolicyName: + if balancer.Spec.Policy.Priorities == nil { + return nil, PlacementProblems{}, fmt.Errorf("incomplete policy definition: missing priorities") + } + if balancer.Spec.Policy.Priorities.TargetOrder == nil { + return nil, PlacementProblems{}, fmt.Errorf("incomplete policy definition: missing targetOrder") + } + infos := buildTargetInfoMapForPriority(targetMap, summaries) + placement, problems := distributeByPriority(balancer.Spec.Replicas, balancer.Spec.Policy.Priorities.TargetOrder, infos) + return placement, problems, nil + + case v1alpha1.ProportionalPolicyName: + if balancer.Spec.Policy.Proportions == nil { + return nil, PlacementProblems{}, fmt.Errorf("incomplete policy definition: missing proportions") + } + if balancer.Spec.Policy.Proportions.TargetProportions == nil { + return nil, PlacementProblems{}, fmt.Errorf("incomplete policy definition: missing targetProportions") + } + infos := buildTargetInfoMapForProportional(targetMap, summaries, balancer.Spec.Policy.Proportions.TargetProportions) + placement, problems := distributeByProportions(balancer.Spec.Replicas, infos) + return placement, problems, nil + + default: + return nil, PlacementProblems{}, fmt.Errorf("policy not supported: %v", balancer.Spec.Policy.PolicyName) + } +} diff --git a/balancer/pkg/policy/priority.go b/balancer/pkg/policy/priority.go new file mode 100644 index 000000000000..a331a4e7258d --- /dev/null +++ b/balancer/pkg/policy/priority.go @@ -0,0 +1,62 @@ +/* +Copyright 2023 The Kubernetes Authors. + +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. +*/ + +package policy + +// Main algorithm of the priority policy. The function returns the +// desired replica placement and information about problems that +// possibly happened during placement. +func distributeByPriority(replicas int32, + priorities []string, infos map[string]*targetInfo) (ReplicaPlacement, PlacementProblems) { + + placement := make(ReplicaPlacement) + problems := PlacementProblems{} + + // Place target minimums + for k, info := range infos { + placement[k] = info.min + replicas -= placement[k] + } + // continue computations as there still may be fallbacks. + if replicas < 0 { + problems.MissingReplicas = -replicas + replicas = 0 + } + + for _, key := range priorities { + info := infos[key] + free := info.max - placement[key] + if replicas < free { + placement[key] += replicas + replicas = 0 + } else { + placement[key] += free + replicas -= free + } + // calculate how many may need to fall back to the other target = all new plus + // and those that are past deadline. + if infos[key].summary.NotStartedWithinDeadline > 0 { + fallback := info.summary.NotStartedWithinDeadline + placement[key] - info.summary.Total + if fallback > 0 { + replicas += fallback + } + } + } + if replicas > 0 { + problems.OverflowReplicas = replicas + } + return placement, problems +} diff --git a/balancer/pkg/policy/priority_test.go b/balancer/pkg/policy/priority_test.go new file mode 100644 index 000000000000..3f45e2b26abe --- /dev/null +++ b/balancer/pkg/policy/priority_test.go @@ -0,0 +1,192 @@ +/* +Copyright 2023 The Kubernetes Authors. + +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. +*/ + +package policy + +import ( + "fmt" + "testing" + + "github.com/stretchr/testify/assert" + "k8s.io/autoscaling/balancer/pkg/pods" +) + +func TestDistributeByPriority(t *testing.T) { + tests := []struct { + name string + replicas int32 + infos map[string]*targetInfo + priorities []string + expected ReplicaPlacement + problems PlacementProblems + }{ + { + name: "10 replicas, no max", + replicas: 10, + infos: map[string]*targetInfo{ + "a": {max: maxReplicas}, + "b": {max: maxReplicas}, + }, + priorities: []string{"a", "b"}, + expected: ReplicaPlacement{"a": 10, "b": 0}, + }, + { + name: "10 replicas, one max", + replicas: 10, + infos: map[string]*targetInfo{ + "a": {max: 3}, + "b": {max: maxReplicas}, + }, + priorities: []string{"a", "b"}, + expected: ReplicaPlacement{"a": 3, "b": 7}, + }, + { + name: "10 replicas, two max", + replicas: 10, + infos: map[string]*targetInfo{ + "a": {max: 3}, + "b": {max: 4}, + }, + priorities: []string{"a", "b"}, + expected: ReplicaPlacement{"a": 3, "b": 4}, + problems: PlacementProblems{OverflowReplicas: 3}, + }, + { + name: "10 replicas, two mins", + replicas: 10, + infos: map[string]*targetInfo{ + "a": {min: 2, max: maxReplicas}, + "b": {min: 3, max: maxReplicas}, + }, + priorities: []string{"a", "b"}, + expected: ReplicaPlacement{"a": 7, "b": 3}, + }, + { + name: "1 replica, missing 4", + replicas: 1, + infos: map[string]*targetInfo{ + "a": {min: 2, max: maxReplicas}, + "b": {min: 3, max: maxReplicas}, + }, + priorities: []string{"a", "b"}, + expected: ReplicaPlacement{"a": 2, "b": 3}, + problems: PlacementProblems{MissingReplicas: 4}, + }, + { + name: "10 replicas, two mins, two max", + replicas: 10, + infos: map[string]*targetInfo{ + "a": {min: 2, max: 4}, + "b": {min: 3, max: 5}, + }, + priorities: []string{"a", "b"}, + expected: ReplicaPlacement{"a": 4, "b": 5}, + problems: PlacementProblems{OverflowReplicas: 1}, + }, + { + name: "10 replicas, fallback", + replicas: 10, + infos: map[string]*targetInfo{ + "a": {max: maxReplicas, + summary: pods.Summary{ + Total: 3, NotStartedWithinDeadline: 2}}, + "b": {max: maxReplicas}, + }, + priorities: []string{"a", "b"}, + expected: ReplicaPlacement{"a": 10, "b": 9}, + }, + { + name: "6 replica, fallback in min", + replicas: 6, + infos: map[string]*targetInfo{ + "a": {min: 3, max: maxReplicas, + summary: pods.Summary{ + Total: 3, NotStartedWithinDeadline: 3}}, + "b": {min: 3, max: maxReplicas}, + }, + priorities: []string{"a", "b"}, + expected: ReplicaPlacement{"a": 3, "b": 6}, + }, + { + name: "10 replicas, double fallback", + replicas: 10, + infos: map[string]*targetInfo{ + "a": {max: maxReplicas, + summary: pods.Summary{ + Total: 3, NotStartedWithinDeadline: 2}}, + "b": {max: maxReplicas, + summary: pods.Summary{ + Total: 3, NotStartedWithinDeadline: 2}}, + }, + priorities: []string{"a", "b"}, + expected: ReplicaPlacement{"a": 10, "b": 9}, + // one is running in both "a" and "b", rest is problematic. + problems: PlacementProblems{OverflowReplicas: 8}, + }, + { + name: "20 replica, double fallback hitting max", + replicas: 20, + infos: map[string]*targetInfo{ + "a": {max: 10, + summary: pods.Summary{ + Total: 3, NotStartedWithinDeadline: 2}}, + "b": {max: 10, + summary: pods.Summary{ + Total: 3, NotStartedWithinDeadline: 2}}, + }, + priorities: []string{"a", "b"}, + expected: ReplicaPlacement{"a": 10, "b": 10}, + // one is running in both "a" and "b", rest is problematic. + problems: PlacementProblems{OverflowReplicas: 18}, + }, + { + name: "10 replicas, double problems (policy change) but hopefully problematic pods are dropped first", + replicas: 10, + infos: map[string]*targetInfo{ + "a": {max: 10, + summary: pods.Summary{ + Total: 15, NotStartedWithinDeadline: 2}}, + "b": {max: 10, + summary: pods.Summary{ + Total: 15, NotStartedWithinDeadline: 2}}, + }, + priorities: []string{"a", "b"}, + expected: ReplicaPlacement{"a": 10, "b": 0}, + }, + { + name: "10 replicas, single fallback", + replicas: 10, + infos: map[string]*targetInfo{ + "a": {max: maxReplicas, + summary: pods.Summary{ + Total: 3, NotStartedWithinDeadline: 2}}, + "b": {max: maxReplicas, + summary: pods.Summary{ + Total: 3, NotStartedWithinDeadline: 0}}, + }, + priorities: []string{"a", "b"}, + expected: ReplicaPlacement{"a": 10, "b": 9}, + }, + } + + for i, tc := range tests { + t.Run(fmt.Sprintf("%d: %s", i, tc.name), func(t *testing.T) { + result, problems := distributeByPriority(tc.replicas, tc.priorities, tc.infos) + assert.Equal(t, tc.expected, result) + assert.Equal(t, tc.problems, problems) + }) + } +} diff --git a/balancer/pkg/policy/proportional.go b/balancer/pkg/policy/proportional.go new file mode 100644 index 000000000000..89f87e6c6611 --- /dev/null +++ b/balancer/pkg/policy/proportional.go @@ -0,0 +1,127 @@ +/* +Copyright 2023 The Kubernetes Authors. + +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. +*/ + +package policy + +import ( + "sort" +) + +// Returns a sorted subset of the given keys that has some available +// capacity (placement < max). Sorting is required for the stability +// of the algorithm - every time we should process targets in the same +// order so replicas are not flapping between targets. +func sortedKeysWithCapacity(keys []string, placement ReplicaPlacement, + infos map[string]*targetInfo) []string { + + result := make([]string, 0) + for _, k := range keys { + allocated := placement[k] + if infos[k].max <= allocated { + continue + } + result = append(result, k) + } + sort.Strings(result) + return result +} + +// Main algorithm of the proportional policy. The function returns the +// desired replica placement and information about problems. +func distributeByProportions(replicas int32, + infos map[string]*targetInfo) (ReplicaPlacement, PlacementProblems) { + + placement := make(ReplicaPlacement) + problems := PlacementProblems{} + keys := make([]string, 0) + for k := range infos { + keys = append(keys, k) + } + + // Place target minimums. + for _, k := range keys { + info := infos[k] + placement[k] = info.min + replicas -= placement[k] + } + // continue computations as there still may be fallbacks. + if replicas < 0 { + problems.MissingReplicas = -replicas + replicas = 0 + } + + // Do the fist pass with proportions, ignoring not started replicas. + replicas = distributeGroupProportionally(replicas, keys, infos, placement) + + // All targets are full. Not possible to place more, so no fallback. + if replicas > 0 { + problems.OverflowReplicas = replicas + return placement, problems + } + + // Checks which targets have troubles and calculates the number + // of replicas that need to be duplicated in other targets until + // the base targets recover. + notBlockedKeys := make([]string, 0) + for _, key := range keys { + info := infos[key] + if info.summary.NotStartedWithinDeadline > 0 { + fallback := info.summary.NotStartedWithinDeadline + placement[key] - info.summary.Total + if fallback > 0 { + replicas += fallback + } + } else { + notBlockedKeys = append(notBlockedKeys, key) + } + } + + // If there are some replicas that need to be duplicated, distribute them, + // but only among non-problematic targets. + if replicas > 0 { + replicas = distributeGroupProportionally(replicas, notBlockedKeys, infos, placement) + } + problems.OverflowReplicas = replicas + return placement, problems +} + +// Distributes replicas among the given target keys, using the provided proportions. +// The passed replicaPlacement is updated and the return value is the number +// of replicas that could not be placed. It uses D'Hondt method for distributing +// replicas. See https://en.wikipedia.org/wiki/D%27Hondt_method. +func distributeGroupProportionally(replicas int32, keys []string, + infos map[string]*targetInfo, placement ReplicaPlacement) int32 { + okKeys := sortedKeysWithCapacity(keys, placement, infos) + + for ; replicas > 0; replicas-- { + bestKey := "" + bestValue := 0.0 + for _, k := range okKeys { + if placement[k] >= infos[k].max { + continue + } + rank := float64(infos[k].proportion) / float64((1 + placement[k])) + if rank > bestValue { + bestKey = k + bestValue = rank + } + } + if bestKey == "" { + break + } + placement[bestKey] += 1 + } + return replicas +} diff --git a/balancer/pkg/policy/proportional_test.go b/balancer/pkg/policy/proportional_test.go new file mode 100644 index 000000000000..b0138c804bc0 --- /dev/null +++ b/balancer/pkg/policy/proportional_test.go @@ -0,0 +1,277 @@ +/* +Copyright 2023 The Kubernetes Authors. + +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. +*/ + +package policy + +import ( + "fmt" + "testing" + + "github.com/stretchr/testify/assert" + "k8s.io/autoscaling/balancer/pkg/pods" +) + +func TestDistributeByProportions(t *testing.T) { + tests := []struct { + name string + replicas int32 + infos map[string]*targetInfo + expected ReplicaPlacement + problems PlacementProblems + }{ + { + name: "1 replica, 50/50", + replicas: 1, + infos: map[string]*targetInfo{ + "a": {proportion: 50, max: maxReplicas}, + "b": {proportion: 50, max: maxReplicas}, + }, + expected: ReplicaPlacement{"a": 1, "b": 0}, + }, + { + name: "1 replica, 33/33/33", + replicas: 1, + infos: map[string]*targetInfo{ + "a": {proportion: 50, max: maxReplicas}, + "b": {proportion: 50, max: maxReplicas}, + "c": {proportion: 50, max: maxReplicas}, + }, + expected: ReplicaPlacement{"a": 1, "b": 0, "c": 0}, + }, + { + name: "2 replica, 33/33/33", + replicas: 2, + infos: map[string]*targetInfo{ + "a": {proportion: 50, max: maxReplicas}, + "b": {proportion: 50, max: maxReplicas}, + "c": {proportion: 50, max: maxReplicas}, + }, + expected: ReplicaPlacement{"a": 1, "b": 1, "c": 0}, + }, + { + name: "10 replicas, 50/50", + replicas: 10, + infos: map[string]*targetInfo{ + "a": {proportion: 50, max: maxReplicas}, + "b": {proportion: 50, max: maxReplicas}, + }, + expected: ReplicaPlacement{"a": 5, "b": 5}, + }, + { + name: "10 replicas, 70/30", + replicas: 10, + infos: map[string]*targetInfo{ + "a": {proportion: 70, max: maxReplicas}, + "b": {proportion: 30, max: maxReplicas}, + }, + expected: ReplicaPlacement{"a": 7, "b": 3}, + }, + { + name: "100 replicas, 70/30", + replicas: 100, + infos: map[string]*targetInfo{ + "a": {proportion: 70, max: maxReplicas}, + "b": {proportion: 30, max: maxReplicas}, + }, + expected: ReplicaPlacement{"a": 70, "b": 30}, + }, + { + name: "11 replicas, 50/50, stability test", + replicas: 11, + infos: map[string]*targetInfo{ + "a": {proportion: 50, max: maxReplicas}, + "b": {proportion: 50, max: maxReplicas}, + }, + expected: ReplicaPlacement{"a": 6, "b": 5}, + }, + { + name: "10 replicas, 50/50, one max", + replicas: 10, + infos: map[string]*targetInfo{ + "a": {proportion: 50, max: 3}, + "b": {proportion: 50, max: maxReplicas}, + }, + expected: ReplicaPlacement{"a": 3, "b": 7}, + }, + { + name: "10 replicas, 50/50, two max", + replicas: 10, + infos: map[string]*targetInfo{ + "a": {proportion: 50, max: 3}, + "b": {proportion: 50, max: 2}, + }, + expected: ReplicaPlacement{"a": 3, "b": 2}, + problems: PlacementProblems{OverflowReplicas: 5}, + }, + { + name: "10 replicas, 50/50, one small min", + replicas: 10, + infos: map[string]*targetInfo{ + "a": {proportion: 50, min: 3, max: maxReplicas}, + "b": {proportion: 50, max: maxReplicas}, + }, + expected: ReplicaPlacement{"a": 5, "b": 5}, + }, + { + name: "10 replicas, 50/50, one big min", + replicas: 10, + infos: map[string]*targetInfo{ + "a": {proportion: 50, min: 7, max: maxReplicas}, + "b": {proportion: 50, max: maxReplicas}, + }, + expected: ReplicaPlacement{"a": 7, "b": 3}, + }, + { + name: "10 replicas, 50/50, one huge min", + replicas: 10, + infos: map[string]*targetInfo{ + "a": {proportion: 50, min: 20, max: maxReplicas}, + "b": {proportion: 50, max: maxReplicas}, + }, + expected: ReplicaPlacement{"a": 20, "b": 0}, + problems: PlacementProblems{MissingReplicas: 10}, + }, + { + name: "10 replicas, 50/50, two small min", + replicas: 10, + infos: map[string]*targetInfo{ + "a": {proportion: 50, min: 3, max: maxReplicas}, + "b": {proportion: 50, min: 4, max: maxReplicas}, + }, + expected: ReplicaPlacement{"a": 5, "b": 5}, + }, + { + name: "10 replicas, 50/50, two small min, one max", + replicas: 10, + infos: map[string]*targetInfo{ + "a": {proportion: 50, min: 3, max: 3}, + "b": {proportion: 50, min: 4, max: maxReplicas}, + }, + expected: ReplicaPlacement{"a": 3, "b": 7}, + }, + { + name: "10 replicas, 50/50, two small min, two max", + replicas: 10, + infos: map[string]*targetInfo{ + "a": {proportion: 50, min: 3, max: 3}, + "b": {proportion: 50, min: 4, max: 6}, + }, + expected: ReplicaPlacement{"a": 3, "b": 6}, + problems: PlacementProblems{OverflowReplicas: 1}, + }, + { + name: "20 replicas, 70/20/10, one max", + replicas: 20, + infos: map[string]*targetInfo{ + "a": {proportion: 70, max: 5}, + "b": {proportion: 20, max: maxReplicas}, + "c": {proportion: 10, max: maxReplicas}, + }, + expected: ReplicaPlacement{"a": 5, "b": 10, "c": 5}, + }, + { + name: "20 replicas, 48/48/4, two small min, two max", + replicas: 20, + infos: map[string]*targetInfo{ + "a": {proportion: 48, min: 2, max: 5}, + "b": {proportion: 48, min: 2, max: 5}, + "c": {proportion: 4, min: 2, max: maxReplicas}, + }, + expected: ReplicaPlacement{"a": 5, "b": 5, "c": 10}, + }, + { + name: "10 replicas, 50/50, fallback of 2/5 ", + replicas: 10, + infos: map[string]*targetInfo{ + "a": {proportion: 50, min: 0, max: maxReplicas, summary: pods.Summary{ + Total: 5, + NotStartedWithinDeadline: 2, + }}, + "b": {proportion: 50, min: 0, max: maxReplicas}, + }, + expected: ReplicaPlacement{"a": 5, "b": 7}, + }, + { + name: "6 replicas, 50/50, fallback in min ", + replicas: 6, + infos: map[string]*targetInfo{ + "a": {proportion: 50, min: 3, max: maxReplicas, summary: pods.Summary{ + Total: 3, + NotStartedWithinDeadline: 3, + }}, + "b": {proportion: 50, min: 3, max: maxReplicas}, + }, + expected: ReplicaPlacement{"a": 3, "b": 6}, + }, + { + name: "10 replicas, 50/50, fallback of 2/3 + 2 that are likely to fail ", + replicas: 10, + infos: map[string]*targetInfo{ + "a": {proportion: 50, min: 0, max: maxReplicas, summary: pods.Summary{ + Total: 3, + NotStartedWithinDeadline: 2, + }}, + "b": {proportion: 50, min: 0, max: maxReplicas}, + }, + expected: ReplicaPlacement{"a": 5, "b": 9}, + }, + { + name: "18 replicas, 50/50, with max, fallback of 2/9", + replicas: 18, + infos: map[string]*targetInfo{ + "a": {proportion: 50, min: 0, max: 10, summary: pods.Summary{ + Total: 9, + NotStartedWithinDeadline: 2, + }}, + "b": {proportion: 50, min: 0, max: 10}, + }, + expected: ReplicaPlacement{"a": 9, "b": 10}, + problems: PlacementProblems{OverflowReplicas: 1}, + }, + { + name: "20 replicas, 50/50, with imbalance and fallback", + replicas: 20, + infos: map[string]*targetInfo{ + "a": {proportion: 50, min: 0, max: maxReplicas, summary: pods.Summary{ + Total: 15, + NotStartedWithinDeadline: 3, + }}, + "b": {proportion: 50, min: 0, max: maxReplicas}, + }, + expected: ReplicaPlacement{"a": 10, "b": 10}, + }, + { + name: "20 replicas, 50/50, with too few and fallback", + replicas: 20, + infos: map[string]*targetInfo{ + "a": {proportion: 50, min: 0, max: maxReplicas, summary: pods.Summary{ + Total: 3, + NotStartedWithinDeadline: 3, + }}, + "b": {proportion: 50, min: 0, max: maxReplicas}, + }, + expected: ReplicaPlacement{"a": 10, "b": 20}, + }, + } + + for i, tc := range tests { + t.Run(fmt.Sprintf("%d: %s", i, tc.name), func(t *testing.T) { + result, problems := distributeByProportions(tc.replicas, tc.infos) + assert.Equal(t, tc.expected, result) + assert.Equal(t, tc.problems, problems) + }) + } +} diff --git a/balancer/pkg/policy/utils.go b/balancer/pkg/policy/utils.go new file mode 100644 index 000000000000..41a7441b860b --- /dev/null +++ b/balancer/pkg/policy/utils.go @@ -0,0 +1,102 @@ +/* +Copyright 2023 The Kubernetes Authors. + +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. +*/ + +package policy + +import ( + "k8s.io/autoscaling/balancer/pkg/apis/balancer.x-k8s.io/v1alpha1" + "k8s.io/autoscaling/balancer/pkg/pods" +) + +const ( + // maxReplicas is the maximum number of replicas supported by the algorithm. + // It is used as a sentinel value to simplify the code. + maxReplicas = 1000000000 +) + +// buildTargetMap build map of BalancerTargets, keyed with target's name. +func buildTargetMap(targets []v1alpha1.BalancerTarget) map[string]v1alpha1.BalancerTarget { + result := make(map[string]v1alpha1.BalancerTarget) + for _, target := range targets { + result[target.Name] = target + } + return result +} + +// ReplicaPlacement defines the number of replicas for each of the BalancerTargets. +type ReplicaPlacement map[string]int32 + +// targetInfo is the aggregated information about a Balancer target. +type targetInfo struct { + // min replica count taken from BalancerTarget. + min int32 + // max replica count taken from BalancerTarget. + max int32 + // count of pods of given type based on pod listener data. + summary pods.Summary + + // proportion taken from ProportionalPolicy. 0 for other policies. + proportion int32 +} + +// PlacementProblems contains information about replicas that were problematic +// when applying placement policy and constraints. +type PlacementProblems struct { + // MissingReplicas is the number of replicas that had to be added + // on top of the desired count to match the constraint and policy. + MissingReplicas int32 + // OverflowReplicas is the number of replicas that could not be placed + // due to constraints and policy. + OverflowReplicas int32 +} + +// buildTargetInfoMap aggregates information scattered across multiple +// maps into a single one. It assumes that all inputs are already validated +// and consistent. +func buildTargetInfoMapForProportional( + targetMap map[string]v1alpha1.BalancerTarget, + summaryMap map[string]pods.Summary, + proportions map[string]int32) map[string]*targetInfo { + + result := make(map[string]*targetInfo) + for name, target := range targetMap { + summary := summaryMap[name] + prop := proportions[name] + result[name] = &targetInfo{ + proportion: prop, + summary: summary, + min: 0, + max: maxReplicas, + } + if target.MinReplicas != nil { + result[name].min = *target.MinReplicas + } + if target.MaxReplicas != nil { + result[name].max = *target.MaxReplicas + } + } + return result +} + +// buildTargetInfoMap aggregates information scattered across multiple +// maps into a single one. It assumes that all inputs are already validated +// and consistent. +func buildTargetInfoMapForPriority( + targetMap map[string]v1alpha1.BalancerTarget, + summaryMap map[string]pods.Summary) map[string]*targetInfo { + + return buildTargetInfoMapForProportional(targetMap, summaryMap, map[string]int32{}) +}