diff --git a/ddl/ddl.go b/ddl/ddl.go
index ebec94019105b..2277e35ac4b0b 100644
--- a/ddl/ddl.go
+++ b/ddl/ddl.go
@@ -47,6 +47,7 @@ import (
 	"github.com/pingcap/tidb/table"
 	goutil "github.com/pingcap/tidb/util"
 	"github.com/pingcap/tidb/util/admin"
+	"github.com/pingcap/tidb/util/gcutil"
 	"github.com/pingcap/tidb/util/logutil"
 	"go.etcd.io/etcd/clientv3"
 	"go.uber.org/zap"
@@ -731,3 +732,39 @@ func init() {
 		RunInGoTest = true
 	}
 }
+
+// GetDropOrTruncateTableInfoFromJobsByStore implements GetDropOrTruncateTableInfoFromJobs
+func GetDropOrTruncateTableInfoFromJobsByStore(jobs []*model.Job, gcSafePoint uint64, getTable func(uint64, int64, int64) (*model.TableInfo, error), fn func(*model.Job, *model.TableInfo) (bool, error)) (bool, error) {
+	for _, job := range jobs {
+		// Check GC safe point for getting snapshot infoSchema.
+		err := gcutil.ValidateSnapshotWithGCSafePoint(job.StartTS, gcSafePoint)
+		if err != nil {
+			return false, err
+		}
+		if job.Type != model.ActionDropTable && job.Type != model.ActionTruncateTable {
+			continue
+		}
+
+		tbl, err := getTable(job.StartTS, job.SchemaID, job.TableID)
+		if err != nil {
+			if meta.ErrDBNotExists.Equal(err) {
+				// The dropped/truncated DDL maybe execute failed that caused by the parallel DDL execution,
+				// then can't find the table from the snapshot info-schema. Should just ignore error here,
+				// see more in TestParallelDropSchemaAndDropTable.
+				continue
+			}
+			return false, err
+		}
+		if tbl == nil {
+			// The dropped/truncated DDL maybe execute failed that caused by the parallel DDL execution,
+			// then can't find the table from the snapshot info-schema. Should just ignore error here,
+			// see more in TestParallelDropSchemaAndDropTable.
+			continue
+		}
+		finish, err := fn(job, tbl)
+		if err != nil || finish {
+			return finish, err
+		}
+	}
+	return false, nil
+}
diff --git a/executor/ddl.go b/executor/ddl.go
index 255580c04d93b..ac97d95d2fa5a 100644
--- a/executor/ddl.go
+++ b/executor/ddl.go
@@ -710,42 +710,15 @@ func (e *DDLExec) getRecoverTableByJobID(s *ast.RecoverTableStmt, t *meta.Meta,
 // GetDropOrTruncateTableInfoFromJobs gets the dropped/truncated table information from DDL jobs,
 // it will use the `start_ts` of DDL job as snapshot to get the dropped/truncated table information.
 func GetDropOrTruncateTableInfoFromJobs(jobs []*model.Job, gcSafePoint uint64, dom *domain.Domain, fn func(*model.Job, *model.TableInfo) (bool, error)) (bool, error) {
-	for _, job := range jobs {
-		// Check GC safe point for getting snapshot infoSchema.
-		err := gcutil.ValidateSnapshotWithGCSafePoint(job.StartTS, gcSafePoint)
+	getTable := func(StartTS uint64, SchemaID int64, TableID int64) (*model.TableInfo, error) {
+		snapMeta, err := dom.GetSnapshotMeta(StartTS)
 		if err != nil {
-			return false, err
-		}
-		if job.Type != model.ActionDropTable && job.Type != model.ActionTruncateTable {
-			continue
-		}
-
-		snapMeta, err := dom.GetSnapshotMeta(job.StartTS)
-		if err != nil {
-			return false, err
-		}
-		tbl, err := snapMeta.GetTable(job.SchemaID, job.TableID)
-		if err != nil {
-			if meta.ErrDBNotExists.Equal(err) {
-				// The dropped/truncated DDL maybe execute failed that caused by the parallel DDL execution,
-				// then can't find the table from the snapshot info-schema. Should just ignore error here,
-				// see more in TestParallelDropSchemaAndDropTable.
-				continue
-			}
-			return false, err
-		}
-		if tbl == nil {
-			// The dropped/truncated DDL maybe execute failed that caused by the parallel DDL execution,
-			// then can't find the table from the snapshot info-schema. Should just ignore error here,
-			// see more in TestParallelDropSchemaAndDropTable.
-			continue
-		}
-		finish, err := fn(job, tbl)
-		if err != nil || finish {
-			return finish, err
+			return nil, err
 		}
+		tbl, err := snapMeta.GetTable(SchemaID, TableID)
+		return tbl, err
 	}
-	return false, nil
+	return ddl.GetDropOrTruncateTableInfoFromJobsByStore(jobs, gcSafePoint, getTable, fn)
 }
 
 func (e *DDLExec) getRecoverTableByTableName(tableName *ast.TableName) (*model.Job, *model.TableInfo, error) {
diff --git a/store/helper/helper.go b/store/helper/helper.go
index 125052d10cd75..00706047eb145 100644
--- a/store/helper/helper.go
+++ b/store/helper/helper.go
@@ -15,6 +15,7 @@
 package helper
 
 import (
+	"bufio"
 	"bytes"
 	"context"
 	"encoding/hex"
@@ -32,7 +33,7 @@ import (
 	"github.com/pingcap/errors"
 	deadlockpb "github.com/pingcap/kvproto/pkg/deadlock"
 	"github.com/pingcap/kvproto/pkg/kvrpcpb"
-	"github.com/pingcap/log"
+	"github.com/pingcap/tidb/ddl/placement"
 	"github.com/pingcap/tidb/kv"
 	"github.com/pingcap/tidb/metrics"
 	"github.com/pingcap/tidb/parser/model"
@@ -875,7 +876,7 @@ type PDRegionStats struct {
 func (h *Helper) GetPDRegionStats(tableID int64, stats *PDRegionStats) error {
 	pdAddrs, err := h.GetPDAddr()
 	if err != nil {
-		return err
+		return errors.Trace(err)
 	}
 
 	startKey := tablecodec.EncodeTablePrefix(tableID)
@@ -891,12 +892,183 @@ func (h *Helper) GetPDRegionStats(tableID int64, stats *PDRegionStats) error {
 
 	resp, err := util.InternalHTTPClient().Get(statURL)
 	if err != nil {
-		return err
+		return errors.Trace(err)
+	}
+	defer func() {
+		if err = resp.Body.Close(); err != nil {
+			logutil.BgLogger().Error("err", zap.Error(err))
+		}
+	}()
+
+	dec := json.NewDecoder(resp.Body)
+
+	return dec.Decode(stats)
+}
+
+// DeletePlacementRule is to delete placement rule for certain group.
+func (h *Helper) DeletePlacementRule(group string, ruleID string) error {
+	pdAddrs, err := h.GetPDAddr()
+	if err != nil {
+		return errors.Trace(err)
+	}
+
+	deleteURL := fmt.Sprintf("%s://%s/pd/api/v1/config/rule/%v/%v",
+		util.InternalHTTPSchema(),
+		pdAddrs[0],
+		group,
+		ruleID,
+	)
+
+	req, err := http.NewRequest("DELETE", deleteURL, nil)
+	if err != nil {
+		return errors.Trace(err)
+	}
+
+	resp, err := util.InternalHTTPClient().Do(req)
+	if err != nil {
+		return errors.Trace(err)
+	}
+	defer func() {
+		if err = resp.Body.Close(); err != nil {
+			logutil.BgLogger().Error("err", zap.Error(err))
+		}
+	}()
+	if resp.StatusCode != http.StatusOK {
+		return errors.New("DeletePlacementRule returns error")
+	}
+	return nil
+}
+
+// SetPlacementRule is a helper function to set placement rule.
+func (h *Helper) SetPlacementRule(rule placement.Rule) error {
+	pdAddrs, err := h.GetPDAddr()
+	if err != nil {
+		return errors.Trace(err)
+	}
+	m, _ := json.Marshal(rule)
+
+	postURL := fmt.Sprintf("%s://%s/pd/api/v1/config/rule",
+		util.InternalHTTPSchema(),
+		pdAddrs[0],
+	)
+	buf := bytes.NewBuffer(m)
+	resp, err := util.InternalHTTPClient().Post(postURL, "application/json", buf)
+	if err != nil {
+		return errors.Trace(err)
+	}
+	defer func() {
+		if err = resp.Body.Close(); err != nil {
+			logutil.BgLogger().Error("err", zap.Error(err))
+		}
+	}()
+	if resp.StatusCode != http.StatusOK {
+		return errors.New("SetPlacementRule returns error")
+	}
+	return nil
+}
+
+// GetGroupRules to get all placement rule in a certain group.
+func (h *Helper) GetGroupRules(group string) ([]placement.Rule, error) {
+	pdAddrs, err := h.GetPDAddr()
+	if err != nil {
+		return nil, errors.Trace(err)
+	}
+
+	getURL := fmt.Sprintf("%s://%s/pd/api/v1/config/rules/group/%s",
+		util.InternalHTTPSchema(),
+		pdAddrs[0],
+		group,
+	)
+
+	resp, err := util.InternalHTTPClient().Get(getURL)
+	if err != nil {
+		return nil, errors.Trace(err)
+	}
+	defer func() {
+		if err = resp.Body.Close(); err != nil {
+			logutil.BgLogger().Error("err", zap.Error(err))
+		}
+	}()
+
+	if resp.StatusCode != http.StatusOK {
+		return nil, errors.New("GetGroupRules returns error")
+	}
+
+	buf := new(bytes.Buffer)
+	_, err = buf.ReadFrom(resp.Body)
+	if err != nil {
+		return nil, errors.Trace(err)
+	}
+
+	var rules []placement.Rule
+	err = json.Unmarshal(buf.Bytes(), &rules)
+	if err != nil {
+		return nil, errors.Trace(err)
+	}
+
+	return rules, nil
+}
+
+// PostAccelerateSchedule sends `regions/accelerate-schedule` request.
+func (h *Helper) PostAccelerateSchedule(tableID int64) error {
+	pdAddrs, err := h.GetPDAddr()
+	if err != nil {
+		return errors.Trace(err)
 	}
+	startKey := tablecodec.GenTableRecordPrefix(tableID)
+	endKey := tablecodec.EncodeTablePrefix(tableID + 1)
+	startKey = codec.EncodeBytes([]byte{}, startKey)
+	endKey = codec.EncodeBytes([]byte{}, endKey)
 
+	postURL := fmt.Sprintf("%s://%s/pd/api/v1/regions/accelerate-schedule",
+		util.InternalHTTPSchema(),
+		pdAddrs[0])
+
+	input := map[string]string{
+		"start_key": url.QueryEscape(string(startKey)),
+		"end_key":   url.QueryEscape(string(endKey)),
+	}
+	v, err := json.Marshal(input)
+	if err != nil {
+		return errors.Trace(err)
+	}
+	resp, err := util.InternalHTTPClient().Post(postURL, "application/json", bytes.NewBuffer(v))
+	if err != nil {
+		return errors.Trace(err)
+	}
 	defer func() {
 		if err = resp.Body.Close(); err != nil {
-			log.Error("err", zap.Error(err))
+			logutil.BgLogger().Error("err", zap.Error(err))
+		}
+	}()
+	return nil
+}
+
+// GetPDRegionRecordStats is a helper function calling `/stats/region`.
+func (h *Helper) GetPDRegionRecordStats(tableID int64, stats *PDRegionStats) error {
+	pdAddrs, err := h.GetPDAddr()
+	if err != nil {
+		return errors.Trace(err)
+	}
+
+	startKey := tablecodec.GenTableRecordPrefix(tableID)
+	endKey := tablecodec.EncodeTablePrefix(tableID + 1)
+	startKey = codec.EncodeBytes([]byte{}, startKey)
+	endKey = codec.EncodeBytes([]byte{}, endKey)
+
+	statURL := fmt.Sprintf("%s://%s/pd/api/v1/stats/region?start_key=%s&end_key=%s",
+		util.InternalHTTPSchema(),
+		pdAddrs[0],
+		url.QueryEscape(string(startKey)),
+		url.QueryEscape(string(endKey)))
+
+	resp, err := util.InternalHTTPClient().Get(statURL)
+	if err != nil {
+		return errors.Trace(err)
+	}
+	defer func() {
+		if err = resp.Body.Close(); err != nil {
+			logutil.BgLogger().Error("err", zap.Error(err))
 		}
 	}()
 
@@ -904,3 +1076,62 @@ func (h *Helper) GetPDRegionStats(tableID int64, stats *PDRegionStats) error {
 
 	return dec.Decode(stats)
 }
+
+// GetTiFlashTableIDFromEndKey computes tableID from pd rule's endKey.
+func GetTiFlashTableIDFromEndKey(endKey string) int64 {
+	endKey, _ = url.QueryUnescape(endKey)
+	_, decodedEndKey, _ := codec.DecodeBytes([]byte(endKey), []byte{})
+	tableID := tablecodec.DecodeTableID(decodedEndKey)
+	tableID -= 1
+	return tableID
+}
+
+// ComputeTiFlashStatus is helper function for CollectTiFlashStatus.
+func ComputeTiFlashStatus(reader *bufio.Reader, regionReplica *map[int64]int) error {
+	ns, _, _ := reader.ReadLine()
+	n, err := strconv.ParseInt(string(ns), 10, 64)
+	if err != nil {
+		return errors.Trace(err)
+	}
+	for i := int64(0); i < n; i++ {
+		rs, _, _ := reader.ReadLine()
+		// For (`table`, `store`), has region `r`
+		r, err := strconv.ParseInt(strings.Trim(string(rs), "\r\n \t"), 10, 32)
+		if err != nil {
+			return errors.Trace(err)
+		}
+		if i, ok := (*regionReplica)[r]; ok {
+			(*regionReplica)[r] = i + 1
+		} else {
+			(*regionReplica)[r] = 1
+		}
+	}
+	return nil
+}
+
+// CollectTiFlashStatus query sync status of one table from TiFlash store.
+// `regionReplica` is a map from RegionID to count of TiFlash Replicas in this region.
+func CollectTiFlashStatus(statusAddress string, tableID int64, regionReplica *map[int64]int) error {
+	statURL := fmt.Sprintf("%s://%s/tiflash/sync-status/%d",
+		util.InternalHTTPSchema(),
+		statusAddress,
+		tableID,
+	)
+	resp, err := util.InternalHTTPClient().Get(statURL)
+	if err != nil {
+		return errors.Trace(err)
+	}
+
+	defer func() {
+		err = resp.Body.Close()
+		if err != nil {
+			logutil.BgLogger().Error("close body failed", zap.Error(err))
+		}
+	}()
+
+	reader := bufio.NewReader(resp.Body)
+	if err = ComputeTiFlashStatus(reader, regionReplica); err != nil {
+		return errors.Trace(err)
+	}
+	return nil
+}
diff --git a/store/helper/helper_test.go b/store/helper/helper_test.go
index 3640b4f479cef..c29873fd81c74 100644
--- a/store/helper/helper_test.go
+++ b/store/helper/helper_test.go
@@ -15,10 +15,12 @@
 package helper_test
 
 import (
+	"bufio"
 	"crypto/tls"
 	"encoding/json"
 	"net/http"
 	"net/http/httptest"
+	"strings"
 	"testing"
 	"time"
 
@@ -430,3 +432,21 @@ func mockStoreStatResponse(w http.ResponseWriter, _ *http.Request) {
 		log.Panic("write http response failed", zap.Error(err))
 	}
 }
+
+func TestComputeTiFlashStatus(t *testing.T) {
+	regionReplica := make(map[int64]int)
+	// There are no region in this TiFlash store.
+	resp1 := "0\n\n"
+	// There are one region 1009 in this TiFlash store.
+	resp2 := "1\n1009\n"
+	br1 := bufio.NewReader(strings.NewReader(resp1))
+	br2 := bufio.NewReader(strings.NewReader(resp2))
+	err := helper.ComputeTiFlashStatus(br1, &regionReplica)
+	require.NoError(t, err)
+	err = helper.ComputeTiFlashStatus(br2, &regionReplica)
+	require.NoError(t, err)
+	require.Equal(t, len(regionReplica), 1)
+	v, ok := regionReplica[1009]
+	require.Equal(t, v, 1)
+	require.Equal(t, ok, true)
+}