add case for scale in and out

Signed-off-by: bufferflies <1045931706@qq.com>

tools/pd-simulator/README.md

@@ -43,3 +43,14 @@ Run a specific case with an external PD:
 ```shell
 ./pd-simulator -pd="http://127.0.0.1:2379" -case="casename"
 ```
+
+Run with tiup playgroudn :
+```shell
+tiup playground nightly --host 127.0.0.1 --kv.binpath ./pd-simulator --kv=1 --db=0 --kv.config=./tikv.conf
+```
+tikv conf
+```
+case-name="redundant-balance-region"
+sim-tick-interval="1s"
+store-io-per-second=100
+```

tools/pd-simulator/simulator/cases/scale_tikv.go

@@ -19,7 +19,6 @@ import (
 	"github.com/tikv/pd/pkg/core"
 	"github.com/tikv/pd/tools/pd-simulator/simulator/info"
 	"github.com/tikv/pd/tools/pd-simulator/simulator/simutil"
-	"go.uber.org/zap"
 )
 
 func newScaleInOut() *Case {
@@ -58,31 +57,22 @@ func newScaleInOut() *Case {
 	scaleInTick := int64(regionNum * 3 / storeNum)
 	addEvent := &AddNodesDescriptor{}
 	addEvent.Step = func(tick int64) uint64 {
-		if tick > scaleInTick {
-			storeNum++
-			return uint64(storeNum)
+		if tick == scaleInTick {
+			return uint64(storeNum + 1)
 		}
 		return 0
 	}
 
 	removeEvent := &DeleteNodesDescriptor{}
 	removeEvent.Step = func(tick int64) uint64 {
-		if tick > scaleInTick*2 {
-			return uint64(storeNum)
+		if tick == scaleInTick*2 {
+			return uint64(storeNum + 1)
 		}
 		return 0
 	}
-
 	simCase.Events = []EventDescriptor{addEvent, removeEvent}
 
-	// storesLastUpdateTime := make([]int64, storeNum+1)
-	// storeLastAvailable := make([]uint64, storeNum+1)
-
 	simCase.Checker = func(regions *core.RegionsInfo, stats []info.StoreStats) bool {
-		newStore := stats[storeNum-1]
-		simutil.Logger.Info("current counts",
-			zap.Uint32("peer-count", newStore.GetRegionCount()),
-		)
 		return false
 	}
 	return &simCase

tools/pd-simulator/simulator/node.go

@@ -70,6 +70,7 @@ func NewNode(s *cases.Store, pdAddr string, config *SimConfig) (*Node, error) {
 		StoreStats: pdpb.StoreStats{
 			StoreId:   s.ID,
 			Capacity:  uint64(config.RaftStore.Capacity),
+			Available: uint64(config.RaftStore.Capacity),
 			StartTime: uint32(time.Now().Unix()),
 		},
 	}