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cluster.go
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cluster.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 faketikv
import (
"context"
"fmt"
"math/rand"
"sort"
"github.com/juju/errors"
"github.com/pingcap/kvproto/pkg/metapb"
"github.com/pingcap/pd/pkg/faketikv/cases"
"github.com/pingcap/pd/pkg/faketikv/simutil"
"github.com/pingcap/pd/server/core"
)
// ClusterInfo records all cluster information.
type ClusterInfo struct {
conf *cases.Conf
*core.RegionsInfo
Nodes map[uint64]*Node
}
// NewClusterInfo creates the initialized cluster with config.
func NewClusterInfo(pdAddr string, conf *cases.Conf) (*ClusterInfo, error) {
cluster := &ClusterInfo{
conf: conf,
RegionsInfo: core.NewRegionsInfo(),
Nodes: make(map[uint64]*Node),
}
for _, store := range conf.Stores {
node, err := NewNode(store.ID, fmt.Sprintf("mock:://tikv-%d", store.ID), pdAddr)
if err != nil {
return nil, errors.Trace(err)
}
node.clusterInfo = cluster
cluster.Nodes[store.ID] = node
}
splitKeys := generateKeys(len(conf.Regions) - 1)
for i, region := range conf.Regions {
meta := &metapb.Region{
Id: region.ID,
Peers: region.Peers,
RegionEpoch: &metapb.RegionEpoch{ConfVer: 1, Version: 1},
}
if i > 0 {
meta.StartKey = []byte(splitKeys[i-1])
}
if i < len(conf.Regions)-1 {
meta.EndKey = []byte(splitKeys[i])
}
regionInfo := core.NewRegionInfo(meta, region.Leader)
regionInfo.ApproximateSize = region.Size
cluster.RegionsInfo.SetRegion(regionInfo)
}
return cluster, nil
}
// GetBootstrapInfo returns a valid bootstrap store and region.
func (c *ClusterInfo) GetBootstrapInfo() (*metapb.Store, *metapb.Region, error) {
region := c.RegionsInfo.RandRegion()
if region == nil {
return nil, nil, errors.New("no region found for bootstrap")
}
if region.Leader == nil {
return nil, nil, errors.New("bootstrap region has no leader")
}
store := c.Nodes[region.Leader.GetStoreId()]
if store == nil {
return nil, nil, errors.Errorf("bootstrap store %v not found", region.Leader.GetStoreId())
}
region.StartKey, region.EndKey = []byte(""), []byte("")
region.RegionEpoch = &metapb.RegionEpoch{}
region.Peers = []*metapb.Peer{region.Leader}
return store.Store, region.Region, nil
}
func (c *ClusterInfo) nodeHealth(storeID uint64) bool {
n, ok := c.Nodes[storeID]
if !ok {
return false
}
return n.GetState() == Up
}
func (c *ClusterInfo) electNewLeader(region *core.RegionInfo) *metapb.Peer {
var (
unhealth int
newLeaderStoreID uint64
)
ids := region.GetStoreIds()
for id := range ids {
if c.nodeHealth(id) {
newLeaderStoreID = id
} else {
unhealth++
}
}
if unhealth > len(ids)/2 {
return nil
}
for _, peer := range region.Peers {
if peer.GetStoreId() == newLeaderStoreID {
return peer
}
}
return nil
}
func (c *ClusterInfo) stepLeader(region *core.RegionInfo) {
if region.Leader != nil && c.nodeHealth(region.Leader.GetStoreId()) {
return
}
newLeader := c.electNewLeader(region)
region.Leader = newLeader
if newLeader == nil {
c.SetRegion(region)
simutil.Logger.Infof("[region %d] no leader", region.GetId())
return
}
simutil.Logger.Infof("[region %d] elect new leader: %+v,old leader: %+v", region.GetId(), newLeader, region.Leader)
c.SetRegion(region)
c.reportRegionChange(region.GetId())
}
func (c *ClusterInfo) stepSplit(region *core.RegionInfo) {
if region.Leader == nil {
return
}
if c.conf.RegionSplitSize == 0 || region.ApproximateSize < c.conf.RegionSplitSize {
return
}
ids := make([]uint64, 1+len(region.Peers))
for i := range ids {
var err error
ids[i], err = c.allocID(region.Leader.GetStoreId())
if err != nil {
simutil.Logger.Infof("alloc id failed: %s", err)
return
}
}
region.RegionEpoch.Version++
region.ApproximateSize /= 2
newRegion := region.Clone()
newRegion.PendingPeers, newRegion.DownPeers = nil, nil
for i, peer := range newRegion.Peers {
peer.Id = ids[i]
}
newRegion.Id = ids[len(ids)-1]
splitKey := generateSplitKey(region.StartKey, region.EndKey)
newRegion.EndKey, region.StartKey = splitKey, splitKey
c.SetRegion(region)
c.SetRegion(newRegion)
c.reportRegionChange(region.Id)
c.reportRegionChange(newRegion.Id)
}
func (c *ClusterInfo) reportRegionChange(regionID uint64) {
region := c.GetRegion(regionID)
if n, ok := c.Nodes[region.Leader.GetStoreId()]; ok {
n.reportRegionChange(region.GetId())
}
}
func (c *ClusterInfo) stepRegions() {
regions := c.GetRegions()
for _, region := range regions {
c.stepLeader(region)
c.stepSplit(region)
}
}
func (c *ClusterInfo) updateRegionSize(writtenBytes map[string]int64) {
for key, size := range writtenBytes {
region := c.SearchRegion([]byte(key))
if region == nil {
simutil.Logger.Errorf("region not found for key %q", key)
continue
}
region.ApproximateSize += size
c.SetRegion(region)
}
}
func (c *ClusterInfo) updateRegionWriteBytes(writeBytes map[uint64]int64) {
for id, bytes := range writeBytes {
region := c.GetRegion(id)
if region == nil {
simutil.Logger.Errorf("region %d not found", id)
continue
}
region.WrittenBytes = uint64(bytes)
c.SetRegion(region)
}
}
func (c *ClusterInfo) updateRegionReadBytes(readBytes map[uint64]int64) {
for id, bytes := range readBytes {
region := c.GetRegion(id)
if region == nil {
simutil.Logger.Errorf("region %d not found", id)
continue
}
region.ReadBytes = uint64(bytes)
c.SetRegion(region)
}
}
// AddTask adds task in specify node.
func (c *ClusterInfo) AddTask(task Task) {
storeID := task.TargetStoreID()
if n, ok := c.Nodes[storeID]; ok {
n.AddTask(task)
}
}
func (c *ClusterInfo) allocID(storeID uint64) (uint64, error) {
node, ok := c.Nodes[storeID]
if !ok {
return 0, errors.Errorf("node %d not found", storeID)
}
id, err := node.client.AllocID(context.Background())
return id, errors.Trace(err)
}
const (
// 26^10 ~= 1.4e+14, should be enough.
keyChars = "abcdefghijklmnopqrstuvwxyz"
keyLen = 10
)
// generate ordered, unique strings.
func generateKeys(size int) []string {
m := make(map[string]struct{}, size)
for len(m) < size {
k := make([]byte, keyLen)
for i := range k {
k[i] = keyChars[rand.Intn(len(keyChars))]
}
m[string(k)] = struct{}{}
}
v := make([]string, 0, size)
for k := range m {
v = append(v, k)
}
sort.Sort(sort.StringSlice(v))
return v
}
func generateSplitKey(start, end []byte) []byte {
var key []byte
// lessThanEnd is set as true when the key is already less than end key.
lessThanEnd := len(end) == 0
for i, s := range start {
e := byte('z')
if !lessThanEnd {
e = end[i]
}
c := (s + e) / 2
key = append(key, c)
// case1: s = c < e. Continue with lessThanEnd=true.
// case2: s < c < e. return key.
// case3: s = c = e. Continue with lessThanEnd=false.
lessThanEnd = c < e
if c > s && c < e {
return key
}
}
key = append(key, ('a'+'z')/2)
return key
}