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utils.go
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utils.go
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// Copyright 2017 PingCAP, Inc.
//
// 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,
// See the License for the specific language governing permissions and
// limitations under the License.
package schedulers
import (
"time"
"github.com/montanaflynn/stats"
"github.com/pingcap/pd/server/cache"
"github.com/pingcap/pd/server/core"
"github.com/pingcap/pd/server/schedule"
)
func minUint64(a, b uint64) uint64 {
if a < b {
return a
}
return b
}
func maxUint64(a, b uint64) uint64 {
if a > b {
return a
}
return b
}
func minDuration(a, b time.Duration) time.Duration {
if a < b {
return a
}
return b
}
func shouldBalance(cluster schedule.Cluster, source, target *core.StoreInfo, region *core.RegionInfo, kind core.ResourceKind, opInfluence schedule.OpInfluence) bool {
// The reason we use max(regionSize, averageRegionSize) to check is:
// 1. prevent moving small regions between stores with close scores, leading to unnecessary balance.
// 2. prevent moving huge regions, leading to over balance.
regionSize := region.GetApproximateSize()
if regionSize < cluster.GetAverageRegionSize() {
regionSize = cluster.GetAverageRegionSize()
}
regionSize = int64(float64(regionSize) * cluster.GetTolerantSizeRatio())
sourceDelta := opInfluence.GetStoreInfluence(source.GetId()).ResourceSize(kind) - regionSize
targetDelta := opInfluence.GetStoreInfluence(target.GetId()).ResourceSize(kind) + regionSize
// Make sure after move, source score is still greater than target score.
return source.ResourceScore(kind, cluster.GetHighSpaceRatio(), cluster.GetLowSpaceRatio(), sourceDelta) >
target.ResourceScore(kind, cluster.GetHighSpaceRatio(), cluster.GetLowSpaceRatio(), targetDelta)
}
func adjustBalanceLimit(cluster schedule.Cluster, kind core.ResourceKind) uint64 {
stores := cluster.GetStores()
counts := make([]float64, 0, len(stores))
for _, s := range stores {
if s.IsUp() {
counts = append(counts, float64(s.ResourceCount(kind)))
}
}
limit, _ := stats.StandardDeviation(stats.Float64Data(counts))
return maxUint64(1, uint64(limit))
}
const (
taintCacheGCInterval = time.Second * 5
taintCacheTTL = time.Minute * 5
)
// newTaintCache creates a TTL cache to hold stores that are not able to
// schedule operators.
func newTaintCache() *cache.TTLUint64 {
return cache.NewIDTTL(taintCacheGCInterval, taintCacheTTL)
}