forked from tikv/pd
/
hot_write.go
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/
hot_write.go
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// Copyright 2018 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 cases
import (
"math/rand"
"github.com/pingcap/kvproto/pkg/metapb"
"github.com/pingcap/pd/server/core"
"github.com/pingcap/pd/tools/pd-simulator/simulator/simutil"
"go.uber.org/zap"
)
func newHotWrite() *Case {
var simCase Case
var id idAllocator
// Initialize the cluster
for i := 1; i <= 10; i++ {
simCase.Stores = append(simCase.Stores, &Store{
ID: id.nextID(),
Status: metapb.StoreState_Up,
Capacity: 1 * TB,
Available: 900 * GB,
Version: "2.1.0",
})
}
for i := 0; i < 500; i++ {
storeIDs := rand.Perm(10)
peers := []*metapb.Peer{
{Id: id.nextID(), StoreId: uint64(storeIDs[0] + 1)},
{Id: id.nextID(), StoreId: uint64(storeIDs[1] + 1)},
{Id: id.nextID(), StoreId: uint64(storeIDs[2] + 1)},
}
simCase.Regions = append(simCase.Regions, Region{
ID: id.nextID(),
Peers: peers,
Leader: peers[0],
Size: 96 * MB,
Keys: 960000,
})
}
simCase.MaxID = id.maxID
// Events description
// select 5 regions on store 1 as hot write regions.
writeFlow := make(map[uint64]int64, 5)
for _, r := range simCase.Regions {
if r.Leader.GetStoreId() == 1 {
writeFlow[r.ID] = 2 * MB
if len(writeFlow) == 5 {
break
}
}
}
e := &WriteFlowOnRegionInner{}
e.Step = func(tick int64) map[uint64]int64 {
return writeFlow
}
simCase.Events = []EventInner{e}
// Checker description
simCase.Checker = func(regions *core.RegionsInfo) bool {
var leaderCount, peerCount [10]int
for id := range writeFlow {
region := regions.GetRegion(id)
leaderCount[int(region.GetLeader().GetStoreId()-1)]++
for _, p := range region.GetPeers() {
peerCount[int(p.GetStoreId()-1)]++
}
}
simutil.Logger.Info("current hot region counts", zap.Reflect("leader", leaderCount), zap.Reflect("peer", peerCount))
// check count diff <= 2.
var minLeader, maxLeader, minPeer, maxPeer int
for i := range leaderCount {
if leaderCount[i] > leaderCount[maxLeader] {
maxLeader = i
}
if leaderCount[i] < leaderCount[minLeader] {
minLeader = i
}
if peerCount[i] > peerCount[maxPeer] {
maxPeer = i
}
if peerCount[i] < peerCount[minPeer] {
minPeer = i
}
}
return leaderCount[maxLeader]-leaderCount[minLeader] <= 2 && peerCount[maxPeer]-peerCount[minPeer] <= 2
}
return &simCase
}