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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.
55 lines
1.5 KiB
Go
55 lines
1.5 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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"github.com/livekit/protocol/livekit"
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)
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// SystemLoadSelector eliminates nodes that surpass has a per-cpu node higher than SysloadLimit
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// then selects a node from nodes that are not overloaded
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type SystemLoadSelector struct {
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SysloadLimit float32
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SortBy string
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Algorithm string
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}
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func (s *SystemLoadSelector) filterNodes(nodes []*livekit.Node) ([]*livekit.Node, error) {
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nodes = GetAvailableNodes(nodes)
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if len(nodes) == 0 {
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return nil, ErrNoAvailableNodes
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}
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nodesLowLoad := make([]*livekit.Node, 0)
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for _, node := range nodes {
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if GetNodeSysload(node) < s.SysloadLimit {
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nodesLowLoad = append(nodesLowLoad, node)
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}
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}
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if len(nodesLowLoad) > 0 {
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nodes = nodesLowLoad
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}
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return nodes, nil
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}
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func (s *SystemLoadSelector) SelectNode(nodes []*livekit.Node) (*livekit.Node, error) {
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nodes, err := s.filterNodes(nodes)
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if err != nil {
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return nil, err
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}
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return SelectSortedNode(nodes, s.SortBy, s.Algorithm)
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}
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