*: add region read/write bytes info and approximate size/keys in show table regions result.

executor/executor_test.go

@@ -4145,7 +4145,7 @@ func (s *testSuite) TestShowTableRegion(c *C) {
 	// 4 regions to store record data.
 	// 1 region to store index data.
 	c.Assert(len(rows), Equals, 5)
-	c.Assert(len(rows[0]), Equals, 7)
+	c.Assert(len(rows[0]), Equals, 11)
 	tbl := testGetTableByName(c, tk.Se, "test", "t_regions")
 	// Check the region start key.
 	c.Assert(rows[0][1], Equals, fmt.Sprintf("t_%d_r", tbl.Meta().ID))

executor/show.go

@@ -1288,5 +1288,10 @@ func (e *ShowExec) fillRegionsToChunk(regions []regionMeta) {
 		} else {
 			e.result.AppendInt64(6, 0)
 		}
+
+		e.result.AppendInt64(7, regions[i].writtenBytes)
+		e.result.AppendInt64(8, regions[i].readBytes)
+		e.result.AppendInt64(9, regions[i].approximateSize)
+		e.result.AppendInt64(10, regions[i].approximateKeys)
 	}
 }

executor/split.go

@@ -29,6 +29,7 @@ import (
 	"github.com/pingcap/parser/mysql"
 	"github.com/pingcap/tidb/kv"
 	"github.com/pingcap/tidb/sessionctx"
+	"github.com/pingcap/tidb/store/helper"
 	"github.com/pingcap/tidb/store/tikv"
 	"github.com/pingcap/tidb/table/tables"
 	"github.com/pingcap/tidb/tablecodec"
@@ -439,12 +440,16 @@ func (e *SplitTableRegionExec) getSplitTableKeys() ([][]byte, error) {
 
 // RegionMeta contains a region's peer detail
 type regionMeta struct {
-	region     *metapb.Region
-	leaderID   uint64
-	storeID    uint64 // storeID is the store ID of the leader region.
-	start      string
-	end        string
-	scattering bool
+	region          *metapb.Region
+	leaderID        uint64
+	storeID         uint64 // storeID is the store ID of the leader region.
+	start           string
+	end             string
+	scattering      bool
+	writtenBytes    int64
+	readBytes       int64
+	approximateSize int64
+	approximateKeys int64
 }
 
 func getPhysicalTableRegions(physicalTableID int64, tableInfo *model.TableInfo, tikvStore tikv.Storage, s kv.SplitableStore, uniqueRegionMap map[uint64]struct{}) ([]regionMeta, error) {
@@ -460,7 +465,7 @@ func getPhysicalTableRegions(physicalTableID int64, tableInfo *model.TableInfo,
 	}
 	recordPrefix := tablecodec.GenTableRecordPrefix(physicalTableID)
 	tablePrefix := tablecodec.GenTablePrefix(physicalTableID)
-	recordRegions, err := getRegionMeta(recordRegionMetas, uniqueRegionMap, tablePrefix, recordPrefix, nil, physicalTableID, 0)
+	recordRegions, err := getRegionMeta(tikvStore, recordRegionMetas, uniqueRegionMap, tablePrefix, recordPrefix, nil, physicalTableID, 0)
 	if err != nil {
 		return nil, err
 	}
@@ -477,7 +482,7 @@ func getPhysicalTableRegions(physicalTableID int64, tableInfo *model.TableInfo,
 			return nil, err
 		}
 		indexPrefix := tablecodec.EncodeTableIndexPrefix(physicalTableID, index.ID)
-		indexRegions, err := getRegionMeta(regionMetas, uniqueRegionMap, tablePrefix, recordPrefix, indexPrefix, physicalTableID, index.ID)
+		indexRegions, err := getRegionMeta(tikvStore, regionMetas, uniqueRegionMap, tablePrefix, recordPrefix, indexPrefix, physicalTableID, index.ID)
 		if err != nil {
 			return nil, err
 		}
@@ -504,7 +509,7 @@ func getPhysicalIndexRegions(physicalTableID int64, indexInfo *model.IndexInfo,
 	recordPrefix := tablecodec.GenTableRecordPrefix(physicalTableID)
 	tablePrefix := tablecodec.GenTablePrefix(physicalTableID)
 	indexPrefix := tablecodec.EncodeTableIndexPrefix(physicalTableID, indexInfo.ID)
-	indexRegions, err := getRegionMeta(regions, uniqueRegionMap, tablePrefix, recordPrefix, indexPrefix, physicalTableID, indexInfo.ID)
+	indexRegions, err := getRegionMeta(tikvStore, regions, uniqueRegionMap, tablePrefix, recordPrefix, indexPrefix, physicalTableID, indexInfo.ID)
 	if err != nil {
 		return nil, err
 	}
@@ -585,7 +590,7 @@ func (d *regionKeyDecoder) decodeRegionKey(key []byte) string {
 	return fmt.Sprintf("%x", key)
 }
 
-func getRegionMeta(regionMetas []*tikv.Region, uniqueRegionMap map[uint64]struct{}, tablePrefix, recordPrefix, indexPrefix []byte, physicalTableID, indexID int64) ([]regionMeta, error) {
+func getRegionMeta(tikvStore tikv.Storage, regionMetas []*tikv.Region, uniqueRegionMap map[uint64]struct{}, tablePrefix, recordPrefix, indexPrefix []byte, physicalTableID, indexID int64) ([]regionMeta, error) {
 	regions := make([]regionMeta, 0, len(regionMetas))
 	for _, r := range regionMetas {
 		if _, ok := uniqueRegionMap[r.GetID()]; ok {
@@ -598,6 +603,37 @@ func getRegionMeta(regionMetas []*tikv.Region, uniqueRegionMap map[uint64]struct
 			storeID:  r.GetLeaderStoreID(),
 		})
 	}
+	regions, err := getRegionInfo(tikvStore, regions)
+	if err != nil {
+		return regions, err
+	}
 	decodeRegionsKey(regions, tablePrefix, recordPrefix, indexPrefix, physicalTableID, indexID)
 	return regions, nil
 }
+
+func getRegionInfo(store tikv.Storage, regions []regionMeta) ([]regionMeta, error) {
+	// check pd server exists.
+	etcd, ok := store.(tikv.EtcdBackend)
+	if !ok {
+		return regions, nil
+	}
+	pdHosts := etcd.EtcdAddrs()
+	if len(pdHosts) == 0 {
+		return regions, nil
+	}
+	tikvHelper := &helper.Helper{
+		Store:       store,
+		RegionCache: store.GetRegionCache(),
+	}
+	for i := range regions {
+		regionInfo, err := tikvHelper.GetRegionInfoByID(regions[i].region.Id)
+		if err != nil {
+			return nil, err
+		}
+		regions[i].writtenBytes = regionInfo.WrittenBytes
+		regions[i].readBytes = regionInfo.ReadBytes
+		regions[i].approximateSize = regionInfo.ApproximateSize
+		regions[i].approximateKeys = regionInfo.ApproximateKeys
+	}
+	return regions, nil
+}

planner/core/planbuilder.go

@@ -1230,14 +1230,18 @@ func buildShowDDLJobsFields() *expression.Schema {
 }
 
 func buildTableRegionsSchema() *expression.Schema {
-	schema := expression.NewSchema(make([]*expression.Column, 0, 10)...)
+	schema := expression.NewSchema(make([]*expression.Column, 0, 11)...)
 	schema.Append(buildColumn("", "REGION_ID", mysql.TypeLonglong, 4))
 	schema.Append(buildColumn("", "START_KEY", mysql.TypeVarchar, 64))
 	schema.Append(buildColumn("", "END_KEY", mysql.TypeVarchar, 64))
 	schema.Append(buildColumn("", "LEADER_ID", mysql.TypeLonglong, 4))
 	schema.Append(buildColumn("", "LEADER_STORE_ID", mysql.TypeLonglong, 4))
 	schema.Append(buildColumn("", "PEERS", mysql.TypeVarchar, 64))
 	schema.Append(buildColumn("", "SCATTERING", mysql.TypeTiny, 1))
+	schema.Append(buildColumn("", "WRITTEN_BYTES", mysql.TypeLonglong, 4))
+	schema.Append(buildColumn("", "READ_BYTES", mysql.TypeLonglong, 4))
+	schema.Append(buildColumn("", "APPROXIMATE_SIZE(MB)", mysql.TypeLonglong, 4))
+	schema.Append(buildColumn("", "APPROXIMATE_KEYS", mysql.TypeLonglong, 4))
 	return schema
 }
 

store/helper/helper.go

@@ -22,6 +22,7 @@ import (
 	"math"
 	"net/http"
 	"sort"
+	"strconv"
 	"strings"
 	"time"
 
@@ -580,6 +581,13 @@ func (h *Helper) GetRegionsInfo() (*RegionsInfo, error) {
 	return &regionsInfo, err
 }
 
+// GetRegionInfoByID gets the region information of the region ID by using PD's api.
+func (h *Helper) GetRegionInfoByID(regionID uint64) (*RegionInfo, error) {
+	var regionInfo RegionInfo
+	err := h.requestPD("GET", pdapi.RegionByID+strconv.FormatUint(regionID, 10), nil, &regionInfo)
+	return &regionInfo, err
+}
+
 // request PD API, decode the response body into res
 func (h *Helper) requestPD(method, uri string, body io.Reader, res interface{}) error {
 	etcd, ok := h.Store.(tikv.EtcdBackend)

util/pdapi/const.go

@@ -15,8 +15,9 @@ package pdapi
 
 // The following constants are the APIs of PD server.
 const (
-	HotRead  = "/pd/api/v1/hotspot/regions/read"
-	HotWrite = "/pd/api/v1/hotspot/regions/write"
-	Regions  = "/pd/api/v1/regions"
-	Stores   = "/pd/api/v1/stores"
+	HotRead    = "/pd/api/v1/hotspot/regions/read"
+	HotWrite   = "/pd/api/v1/hotspot/regions/write"
+	Regions    = "/pd/api/v1/regions"
+	RegionByID = "/pd/api/v1//region/id/"
+	Stores     = "/pd/api/v1/stores"
 )