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a8d4df66f4
* Added optional "Power of Two Random Choices" algorithm for the node selector sort_by feature. The current, default behavior of picking the lowest-valued node remains.
67 lines
2.1 KiB
Go
67 lines
2.1 KiB
Go
// Copyright 2023 LiveKit, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package selector
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import (
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"errors"
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"github.com/livekit/protocol/livekit"
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"github.com/livekit/protocol/logger"
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"github.com/livekit/livekit-server/pkg/config"
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)
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var ErrUnsupportedSelector = errors.New("unsupported node selector")
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// NodeSelector selects an appropriate node to run the current session
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type NodeSelector interface {
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SelectNode(nodes []*livekit.Node) (*livekit.Node, error)
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}
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func CreateNodeSelector(conf *config.Config) (NodeSelector, error) {
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kind := conf.NodeSelector.Kind
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if kind == "" {
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kind = "any"
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}
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switch kind {
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case "any":
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return &AnySelector{conf.NodeSelector.SortBy, conf.NodeSelector.Algorithm}, nil
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case "cpuload":
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return &CPULoadSelector{
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CPULoadLimit: conf.NodeSelector.CPULoadLimit,
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SortBy: conf.NodeSelector.SortBy,
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Algorithm: conf.NodeSelector.Algorithm,
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}, nil
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case "sysload":
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return &SystemLoadSelector{
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SysloadLimit: conf.NodeSelector.SysloadLimit,
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SortBy: conf.NodeSelector.SortBy,
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Algorithm: conf.NodeSelector.Algorithm,
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}, nil
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case "regionaware":
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s, err := NewRegionAwareSelector(conf.Region, conf.NodeSelector.Regions, conf.NodeSelector.SortBy, conf.NodeSelector.Algorithm)
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if err != nil {
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return nil, err
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}
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s.SysloadLimit = conf.NodeSelector.SysloadLimit
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return s, nil
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case "random":
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logger.Warnw("random node selector is deprecated, please switch to \"any\" or another selector", nil)
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return &AnySelector{conf.NodeSelector.SortBy, conf.NodeSelector.Algorithm}, nil
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default:
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return nil, ErrUnsupportedSelector
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}
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}
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