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node_choose.go
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node_choose.go
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// Licensed to LinDB under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. LinDB licenses this file to you 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 flow
import (
"math/rand"
"time"
"github.com/lindb/lindb/models"
)
//go:generate mockgen -source=./node_choose.go -destination=./node_choose_mock.go -package=flow
// NodeChoose represents node choose for data query.
type NodeChoose interface {
// Choose chooses the compute nodes then builds physical plan.
Choose(database string, numOfNodes int) ([]*models.PhysicalPlan, error)
}
// BuildPhysicalPlan returns physical plan based on live nodes and node number, need shuffle live node.
func BuildPhysicalPlan(database string, liveNodes []models.StatelessNode, numOfNodes int) *models.PhysicalPlan {
physicalPlan := &models.PhysicalPlan{
Database: database,
}
numOfLiveNodes := len(liveNodes)
if numOfLiveNodes > 0 {
// shuffle broker nodes
rand.Seed(time.Now().Unix())
rand.Shuffle(numOfLiveNodes, func(i, j int) {
liveNodes[i], liveNodes[j] = liveNodes[j], liveNodes[i]
})
for i, node := range liveNodes {
if i == numOfNodes {
break
}
receiveOnly := true
if i == 0 {
receiveOnly = false
}
physicalPlan.AddTarget(&models.Target{
Indicator: node.Indicator(),
ReceiveOnly: receiveOnly,
})
}
}
return physicalPlan
}