restore: support online restore (#114)

Signed-off-by: disksing <i@disksing.com>

pkg/restore/client.go

@@ -5,21 +5,28 @@ package restore
 import (
 	"context"
 	"crypto/tls"
+	"encoding/hex"
 	"encoding/json"
+	"fmt"
 	"math"
 	"sort"
+	"strconv"
 	"sync"
 	"time"
 
 	"github.com/pingcap/errors"
 	"github.com/pingcap/kvproto/pkg/backup"
 	"github.com/pingcap/kvproto/pkg/import_sstpb"
+	"github.com/pingcap/kvproto/pkg/metapb"
 	"github.com/pingcap/log"
 	"github.com/pingcap/parser/model"
 	pd "github.com/pingcap/pd/v4/client"
+	"github.com/pingcap/pd/v4/server/schedule/placement"
 	"github.com/pingcap/tidb/domain"
 	"github.com/pingcap/tidb/kv"
 	"github.com/pingcap/tidb/store/tikv/oracle"
+	"github.com/pingcap/tidb/tablecodec"
+	"github.com/pingcap/tidb/util/codec"
 	"go.uber.org/zap"
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/backoff"
@@ -42,6 +49,7 @@ type Client struct {
 	cancel context.CancelFunc
 
 	pdClient     pd.Client
+	toolClient   SplitClient
 	fileImporter FileImporter
 	workerPool   *utils.WorkerPool
 	tlsConf      *tls.Config
@@ -53,6 +61,8 @@ type Client struct {
 	rateLimit       uint64
 	isOnline        bool
 	hasSpeedLimited bool
+
+	restoreStores []uint64
 }
 
 // NewRestoreClient returns a new RestoreClient
@@ -71,11 +81,12 @@ func NewRestoreClient(
 	}
 
 	return &Client{
-		ctx:      ctx,
-		cancel:   cancel,
-		pdClient: pdClient,
-		db:       db,
-		tlsConf:  tlsConf,
+		ctx:        ctx,
+		cancel:     cancel,
+		pdClient:   pdClient,
+		toolClient: NewSplitClient(pdClient, tlsConf),
+		db:         db,
+		tlsConf:    tlsConf,
 	}, nil
 }
 
@@ -457,6 +468,159 @@ func (rc *Client) ValidateChecksum(
 	return nil
 }
 
+const (
+	restoreLabelKey   = "exclusive"
+	restoreLabelValue = "restore"
+)
+
+// LoadRestoreStores loads the stores used to restore data.
+func (rc *Client) LoadRestoreStores(ctx context.Context) error {
+	if !rc.isOnline {
+		return nil
+	}
+
+	stores, err := rc.pdClient.GetAllStores(ctx)
+	if err != nil {
+		return err
+	}
+	for _, s := range stores {
+		if s.GetState() != metapb.StoreState_Up {
+			continue
+		}
+		for _, l := range s.GetLabels() {
+			if l.GetKey() == restoreLabelKey && l.GetValue() == restoreLabelValue {
+				rc.restoreStores = append(rc.restoreStores, s.GetId())
+				break
+			}
+		}
+	}
+	log.Info("load restore stores", zap.Uint64s("store-ids", rc.restoreStores))
+	return nil
+}
+
+// ResetRestoreLabels removes the exclusive labels of the restore stores.
+func (rc *Client) ResetRestoreLabels(ctx context.Context) error {
+	if !rc.isOnline {
+		return nil
+	}
+	log.Info("start reseting store labels")
+	return rc.toolClient.SetStoresLabel(ctx, rc.restoreStores, restoreLabelKey, "")
+}
+
+// SetupPlacementRules sets rules for the tables' regions.
+func (rc *Client) SetupPlacementRules(ctx context.Context, tables []*model.TableInfo) error {
+	if !rc.isOnline || len(rc.restoreStores) == 0 {
+		return nil
+	}
+	log.Info("start setting placement rules")
+	rule, err := rc.toolClient.GetPlacementRule(ctx, "pd", "default")
+	if err != nil {
+		return err
+	}
+	rule.Index = 100
+	rule.Override = true
+	rule.LabelConstraints = append(rule.LabelConstraints, placement.LabelConstraint{
+		Key:    restoreLabelKey,
+		Op:     "in",
+		Values: []string{restoreLabelValue},
+	})
+	for _, t := range tables {
+		rule.ID = rc.getRuleID(t.ID)
+		rule.StartKeyHex = hex.EncodeToString(codec.EncodeBytes([]byte{}, tablecodec.EncodeTablePrefix(t.ID)))
+		rule.EndKeyHex = hex.EncodeToString(codec.EncodeBytes([]byte{}, tablecodec.EncodeTablePrefix(t.ID+1)))
+		err = rc.toolClient.SetPlacementRule(ctx, rule)
+		if err != nil {
+			return err
+		}
+	}
+	log.Info("finish setting placement rules")
+	return nil
+}
+
+// WaitPlacementSchedule waits PD to move tables to restore stores.
+func (rc *Client) WaitPlacementSchedule(ctx context.Context, tables []*model.TableInfo) error {
+	if !rc.isOnline || len(rc.restoreStores) == 0 {
+		return nil
+	}
+	log.Info("start waiting placement schedule")
+	ticker := time.NewTicker(time.Second * 10)
+	defer ticker.Stop()
+	for {
+		select {
+		case <-ticker.C:
+			ok, progress, err := rc.checkRegions(ctx, tables)
+			if err != nil {
+				return err
+			}
+			if ok {
+				log.Info("finish waiting placement schedule")
+				return nil
+			}
+			log.Info("placement schedule progress: " + progress)
+		case <-ctx.Done():
+			return ctx.Err()
+		}
+	}
+}
+
+func (rc *Client) checkRegions(ctx context.Context, tables []*model.TableInfo) (bool, string, error) {
+	for i, t := range tables {
+		start := codec.EncodeBytes([]byte{}, tablecodec.EncodeTablePrefix(t.ID))
+		end := codec.EncodeBytes([]byte{}, tablecodec.EncodeTablePrefix(t.ID+1))
+		ok, regionProgress, err := rc.checkRange(ctx, start, end)
+		if err != nil {
+			return false, "", err
+		}
+		if !ok {
+			return false, fmt.Sprintf("table %v/%v, %s", i, len(tables), regionProgress), nil
+		}
+	}
+	return true, "", nil
+}
+
+func (rc *Client) checkRange(ctx context.Context, start, end []byte) (bool, string, error) {
+	regions, err := rc.toolClient.ScanRegions(ctx, start, end, -1)
+	if err != nil {
+		return false, "", err
+	}
+	for i, r := range regions {
+	NEXT_PEER:
+		for _, p := range r.Region.GetPeers() {
+			for _, storeID := range rc.restoreStores {
+				if p.GetStoreId() == storeID {
+					continue NEXT_PEER
+				}
+			}
+			return false, fmt.Sprintf("region %v/%v", i, len(regions)), nil
+		}
+	}
+	return true, "", nil
+}
+
+// ResetPlacementRules removes placement rules for tables.
+func (rc *Client) ResetPlacementRules(ctx context.Context, tables []*model.TableInfo) error {
+	if !rc.isOnline || len(rc.restoreStores) == 0 {
+		return nil
+	}
+	log.Info("start reseting placement rules")
+	var failedTables []int64
+	for _, t := range tables {
+		err := rc.toolClient.DeletePlacementRule(ctx, "pd", rc.getRuleID(t.ID))
+		if err != nil {
+			log.Info("failed to delete placement rule for table", zap.Int64("table-id", t.ID))
+			failedTables = append(failedTables, t.ID)
+		}
+	}
+	if len(failedTables) > 0 {
+		return errors.Errorf("failed to delete placement rules for tables %v", failedTables)
+	}
+	return nil
+}
+
+func (rc *Client) getRuleID(tableID int64) string {
+	return "restore-t" + strconv.FormatInt(tableID, 10)
+}
+
 // IsIncremental returns whether this backup is incremental
 func (rc *Client) IsIncremental() bool {
 	return !(rc.backupMeta.StartVersion == rc.backupMeta.EndVersion ||

pkg/task/restore.go

@@ -8,6 +8,7 @@ import (
 	"github.com/pingcap/errors"
 	"github.com/pingcap/kvproto/pkg/backup"
 	"github.com/pingcap/log"
+	"github.com/pingcap/parser/model"
 	"github.com/pingcap/tidb-tools/pkg/filter"
 	"github.com/spf13/pflag"
 	"go.uber.org/zap"
@@ -91,6 +92,10 @@ func RunRestore(c context.Context, g glue.Glue, cmdName string, cfg *RestoreConf
 	if cfg.Online {
 		client.EnableOnline()
 	}
+	err = client.LoadRestoreStores(ctx)
+	if err != nil {
+		return err
+	}
 
 	defer summary.Summary(cmdName)
 
@@ -137,6 +142,10 @@ func RunRestore(c context.Context, g glue.Glue, cmdName string, cfg *RestoreConf
 	}
 	summary.CollectInt("restore ranges", len(ranges))
 
+	if err = splitPrepareWork(ctx, client, newTables); err != nil {
+		return err
+	}
+
 	ranges = restore.AttachFilesToRanges(files, ranges)
 
 	// Redirect to log if there is no log file to avoid unreadable output.
@@ -203,6 +212,10 @@ func RunRestore(c context.Context, g glue.Glue, cmdName string, cfg *RestoreConf
 		return err
 	}
 
+	if err = splitPostWork(ctx, client, newTables); err != nil {
+		return err
+	}
+
 	// Restore has finished.
 	close(updateCh)
 
@@ -305,3 +318,31 @@ func addPDLeaderScheduler(ctx context.Context, mgr *conn.Mgr, removedSchedulers
 	}
 	return nil
 }
+
+func splitPrepareWork(ctx context.Context, client *restore.Client, tables []*model.TableInfo) error {
+	err := client.SetupPlacementRules(ctx, tables)
+	if err != nil {
+		log.Error("setup placement rules failed", zap.Error(err))
+		return errors.Trace(err)
+	}
+
+	err = client.WaitPlacementSchedule(ctx, tables)
+	if err != nil {
+		log.Error("wait placement schedule failed", zap.Error(err))
+		return errors.Trace(err)
+	}
+	return nil
+}
+
+func splitPostWork(ctx context.Context, client *restore.Client, tables []*model.TableInfo) error {
+	err := client.ResetPlacementRules(ctx, tables)
+	if err != nil {
+		return errors.Trace(err)
+	}
+
+	err = client.ResetRestoreLabels(ctx)
+	if err != nil {
+		return errors.Trace(err)
+	}
+	return nil
+}

tests/br_db_online/run.sh

@@ -0,0 +1,54 @@
+#!/bin/sh
+#
+# Copyright 2020 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.
+
+set -eu
+DB="$TEST_NAME"
+
+run_sql "CREATE DATABASE $DB;"
+
+run_sql "CREATE TABLE $DB.usertable1 ( \
+  YCSB_KEY varchar(64) NOT NULL, \
+  FIELD0 varchar(1) DEFAULT NULL, \
+  PRIMARY KEY (YCSB_KEY) \
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin;"
+
+run_sql "INSERT INTO $DB.usertable1 VALUES (\"a\", \"b\");"
+run_sql "INSERT INTO $DB.usertable1 VALUES (\"aa\", \"b\");"
+
+run_sql "CREATE TABLE $DB.usertable2 ( \
+  YCSB_KEY varchar(64) NOT NULL, \
+  FIELD0 varchar(1) DEFAULT NULL, \
+  PRIMARY KEY (YCSB_KEY) \
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin;"
+
+run_sql "INSERT INTO $DB.usertable2 VALUES (\"c\", \"d\");"
+
+# backup db
+echo "backup start..."
+run_br --pd $PD_ADDR backup db --db "$DB" -s "local://$TEST_DIR/$DB" --ratelimit 5 --concurrency 4
+
+run_sql "DROP DATABASE $DB;"
+
+# restore db
+echo "restore start..."
+run_br restore db --db $DB -s "local://$TEST_DIR/$DB" --pd $PD_ADDR --online
+
+table_count=$(run_sql "use $DB; show tables;" | grep "Tables_in" | wc -l)
+if [ "$table_count" -ne "2" ];then
+    echo "TEST: [$TEST_NAME] failed!"
+    exit 1
+fi
+
+run_sql "DROP DATABASE $DB;"