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54 lines
1.6 KiB
Go
54 lines
1.6 KiB
Go
// Licensed to the LF AI & Data foundation under one
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// or more contributor license agreements. See the NOTICE file
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// distributed with this work for additional information
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// regarding copyright ownership. The ASF licenses this file
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// to you under the Apache License, Version 2.0 (the
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// "License"); you may not use this file except in compliance
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// with the License. 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 proxy
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import (
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"sync"
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"github.com/milvus-io/milvus/pkg/util/merr"
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)
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type RoundRobinBalancer struct {
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// request num send to each node
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mutex sync.RWMutex
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nodeWorkload map[int64]int64
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}
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func NewRoundRobinBalancer() *RoundRobinBalancer {
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return &RoundRobinBalancer{
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nodeWorkload: make(map[int64]int64),
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}
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}
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func (b *RoundRobinBalancer) SelectNode(availableNodes []int64, workload int64) (int64, error) {
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if len(availableNodes) == 0 {
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return -1, merr.ErrNoAvailableNode
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}
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b.mutex.Lock()
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defer b.mutex.Unlock()
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targetNode := int64(-1)
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targetNodeWorkload := int64(-1)
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for _, node := range availableNodes {
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if targetNodeWorkload == -1 || b.nodeWorkload[node] < targetNodeWorkload {
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targetNode = node
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targetNodeWorkload = b.nodeWorkload[node]
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}
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}
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b.nodeWorkload[targetNode] += workload
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return targetNode, nil
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}
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