This is an automated cherry-pick of pingcap#1458

Signed-off-by: ti-chi-bot <ti-community-prow-bot@tidb.io>

pkg/backup/schema.go

@@ -86,6 +86,11 @@ func (ss *Schemas) BackupSchemas(
 	startAll := time.Now()
 	for _, s := range ss.schemas {
 		schema := s
+		// Because schema.dbInfo is a pointer that many tables point to.
+		// Remove "add Temporary-prefix into dbName" from closure to prevent concurrent operations.
+		if utils.IsSysDB(schema.dbInfo.Name.L) {
+			schema.dbInfo.Name = utils.TemporaryDBName(schema.dbInfo.Name.O)
+		}
 		workerPool.ApplyOnErrorGroup(errg, func() error {
 			logger := log.With(
 				zap.String("db", schema.dbInfo.Name.O),

pkg/backup/schema_test.go

@@ -4,7 +4,9 @@ package backup_test
 
 import (
 	"context"
+	"fmt"
 	"math"
+	"strings"
 	"sync/atomic"
 
 	. "github.com/pingcap/check"
@@ -15,6 +17,11 @@ import (
 
 	"github.com/pingcap/br/pkg/backup"
 	"github.com/pingcap/br/pkg/mock"
+<<<<<<< HEAD
+=======
+	"github.com/pingcap/br/pkg/storage"
+	"github.com/pingcap/br/pkg/utils"
+>>>>>>> ec59c7b6 (lightning: cherry-pick some PRs  (#1458))
 )
 
 var _ = Suite(&testBackupSchemaSuite{})
@@ -184,3 +191,37 @@ func (s *testBackupSchemaSuite) TestBuildBackupRangeAndSchemaWithBrokenStats(c *
 	c.Assert(schemas2[0].Table, DeepEquals, schemas[0].Table)
 	c.Assert(schemas2[0].Db, DeepEquals, schemas[0].Db)
 }
+
+func (s *testBackupSchemaSuite) TestBackupSchemasForSystemTable(c *C) {
+	tk := testkit.NewTestKit(c, s.mock.Storage)
+	es2 := s.GetRandomStorage(c)
+
+	systemTablesCount := 32
+	tablePrefix := "systable"
+	tk.MustExec("use mysql")
+	for i := 1; i <= systemTablesCount; i++ {
+		query := fmt.Sprintf("create table %s%d (a char(1));", tablePrefix, i)
+		tk.MustExec(query)
+	}
+
+	f, err := filter.Parse([]string{"mysql.systable*"})
+	c.Assert(err, IsNil)
+	_, backupSchemas, err := backup.BuildBackupRangeAndSchema(s.mock.Storage, f, math.MaxUint64)
+	c.Assert(err, IsNil)
+	c.Assert(backupSchemas.Len(), Equals, systemTablesCount)
+
+	ctx := context.Background()
+	updateCh := new(simpleProgress)
+
+	metaWriter2 := metautil.NewMetaWriter(es2, metautil.MetaFileSize, false)
+	err = backupSchemas.BackupSchemas(ctx, metaWriter2, s.mock.Storage, nil,
+		math.MaxUint64, 1, variable.DefChecksumTableConcurrency, true, updateCh)
+	c.Assert(err, IsNil)
+
+	schemas2 := s.GetSchemasFromMeta(c, es2)
+	c.Assert(schemas2, HasLen, systemTablesCount)
+	for _, schema := range schemas2 {
+		c.Assert(schema.DB.Name, Equals, utils.TemporaryDBName("mysql"))
+		c.Assert(strings.HasPrefix(schema.Info.Name.O, tablePrefix), Equals, true)
+	}
+}

pkg/lightning/mydump/region.go

@@ -31,7 +31,11 @@ import (
 	"github.com/pingcap/br/pkg/storage"
 )
 
-const tableRegionSizeWarningThreshold int64 = 1024 * 1024 * 1024
+const (
+	tableRegionSizeWarningThreshold int64 = 1024 * 1024 * 1024
+	// the increment ratio of large CSV file size threshold by `region-split-size`
+	largeCSVLowerThresholdRation = 10
+)
 
 type TableRegion struct {
 	EngineID int32
@@ -260,7 +264,10 @@ func makeSourceFileRegion(
 	}
 	// If a csv file is overlarge, we need to split it into multiple regions.
 	// Note: We can only split a csv file whose format is strict.
-	if isCsvFile && dataFileSize > int64(cfg.Mydumper.MaxRegionSize) && cfg.Mydumper.StrictFormat {
+	// We increase the check threshold by 1/10 of the `max-region-size` because the source file size dumped by tools
+	// like dumpling might be slight exceed the threshold when it is equal `max-region-size`, so we can
+	// avoid split a lot of small chunks.
+	if isCsvFile && cfg.Mydumper.StrictFormat && dataFileSize > int64(cfg.Mydumper.MaxRegionSize+cfg.Mydumper.MaxRegionSize/largeCSVLowerThresholdRation) {
 		_, regions, subFileSizes, err := SplitLargeFile(ctx, meta, cfg, fi, divisor, 0, ioWorkers, store)
 		return regions, subFileSizes, err
 	}
@@ -351,6 +358,9 @@ func SplitLargeFile(
 		columns = parser.Columns()
 		startOffset, _ = parser.Pos()
 		endOffset = startOffset + maxRegionSize
+		if endOffset > dataFile.FileMeta.FileSize {
+			endOffset = dataFile.FileMeta.FileSize
+		}
 	}
 	for {
 		curRowsCnt := (endOffset - startOffset) / divisor

pkg/lightning/mydump/region_test.go

@@ -292,3 +292,111 @@ func (s *testMydumpRegionSuite) TestSplitLargeFileNoNewLine(c *C) {
 		c.Assert(regions[i].Chunk.Columns, DeepEquals, columns)
 	}
 }
+<<<<<<< HEAD
+=======
+
+func (s *testMydumpRegionSuite) TestSplitLargeFileWithCustomTerminator(c *C) {
+	meta := &MDTableMeta{
+		DB:   "csv",
+		Name: "large_csv_with_custom_terminator",
+	}
+	cfg := &config.Config{
+		Mydumper: config.MydumperRuntime{
+			ReadBlockSize: config.ReadBlockSize,
+			CSV: config.CSVConfig{
+				Separator:  "|+|",
+				Terminator: "|+|\n",
+			},
+			StrictFormat:  true,
+			Filter:        []string{"*.*"},
+			MaxRegionSize: 1,
+		},
+	}
+
+	dir := c.MkDir()
+
+	fileName := "test2.csv"
+	filePath := filepath.Join(dir, fileName)
+
+	content := []byte("5|+|abc\ndef\nghi|+|6|+|\n7|+|xyz|+|8|+|\n9|+||+|10")
+	err := os.WriteFile(filePath, content, 0o644)
+	c.Assert(err, IsNil)
+
+	dataFileInfo, err := os.Stat(filePath)
+	c.Assert(err, IsNil)
+	fileSize := dataFileInfo.Size()
+	fileInfo := FileInfo{FileMeta: SourceFileMeta{Path: fileName, Type: SourceTypeCSV, FileSize: fileSize}}
+	colCnt := int64(3)
+	prevRowIdxMax := int64(0)
+	ioWorker := worker.NewPool(context.Background(), 4, "io")
+
+	store, err := storage.NewLocalStorage(dir)
+	c.Assert(err, IsNil)
+
+	offsets := [][]int64{{0, 23}, {23, 38}, {38, 47}}
+
+	_, regions, _, err := SplitLargeFile(context.Background(), meta, cfg, fileInfo, colCnt, prevRowIdxMax, ioWorker, store)
+	c.Assert(err, IsNil)
+	c.Assert(regions, HasLen, len(offsets))
+	for i := range offsets {
+		c.Assert(regions[i].Chunk.Offset, Equals, offsets[i][0])
+		c.Assert(regions[i].Chunk.EndOffset, Equals, offsets[i][1])
+	}
+}
+
+func (s *testMydumpRegionSuite) TestSplitLargeFileOnlyOneChunk(c *C) {
+	meta := &MDTableMeta{
+		DB:   "csv",
+		Name: "large_csv_file",
+	}
+	cfg := &config.Config{
+		Mydumper: config.MydumperRuntime{
+			ReadBlockSize: config.ReadBlockSize,
+			CSV: config.CSVConfig{
+				Separator:       ",",
+				Delimiter:       "",
+				Header:          true,
+				TrimLastSep:     false,
+				NotNull:         false,
+				Null:            "NULL",
+				BackslashEscape: true,
+			},
+			StrictFormat:  true,
+			Filter:        []string{"*.*"},
+			MaxRegionSize: 15,
+		},
+	}
+
+	dir := c.MkDir()
+
+	fileName := "test.csv"
+	filePath := filepath.Join(dir, fileName)
+
+	content := []byte("field1,field2\r\n123,456\r\n")
+	err := os.WriteFile(filePath, content, 0o644)
+	c.Assert(err, IsNil)
+
+	dataFileInfo, err := os.Stat(filePath)
+	c.Assert(err, IsNil)
+	fileSize := dataFileInfo.Size()
+	fileInfo := FileInfo{FileMeta: SourceFileMeta{Path: fileName, Type: SourceTypeCSV, FileSize: fileSize}}
+	colCnt := int64(2)
+	columns := []string{"field1", "field2"}
+	prevRowIdxMax := int64(0)
+	ioWorker := worker.NewPool(context.Background(), 4, "io")
+
+	store, err := storage.NewLocalStorage(dir)
+	c.Assert(err, IsNil)
+
+	offsets := [][]int64{{14, 24}}
+
+	_, regions, _, err := SplitLargeFile(context.Background(), meta, cfg, fileInfo, colCnt, prevRowIdxMax, ioWorker, store)
+	c.Assert(err, IsNil)
+	c.Assert(regions, HasLen, len(offsets))
+	for i := range offsets {
+		c.Assert(regions[i].Chunk.Offset, Equals, offsets[i][0])
+		c.Assert(regions[i].Chunk.EndOffset, Equals, offsets[i][1])
+		c.Assert(regions[i].Chunk.Columns, DeepEquals, columns)
+	}
+}
+>>>>>>> ec59c7b6 (lightning: cherry-pick some PRs  (#1458))

pkg/pdutil/pd.go

@@ -123,9 +123,7 @@ var (
 		"max-merge-region-size":       20,
 		"leader-schedule-limit":       4,
 		"region-schedule-limit":       2048,
-		"max-snapshot-count":          3,
 		"enable-location-replacement": "true",
-		"max-pending-peer-count":      16,
 	}
 )
 

pkg/storage/gcs.go

@@ -153,8 +153,41 @@ func (s *gcsStorage) Open(ctx context.Context, path string) (ExternalFileReader,
 // function; the second argument is the size in byte of the file determined
 // by path.
 func (s *gcsStorage) WalkDir(ctx context.Context, opt *WalkOption, fn func(string, int64) error) error {
+<<<<<<< HEAD
 	// TODO, implement this if needed
 	panic("Unsupported Operation")
+=======
+	if opt == nil {
+		opt = &WalkOption{}
+	}
+
+	prefix := path.Join(s.gcs.Prefix, opt.SubDir)
+	if len(prefix) > 0 && !strings.HasSuffix(prefix, "/") {
+		prefix += "/"
+	}
+
+	query := &storage.Query{Prefix: prefix}
+	// only need each object's name and size
+	query.SetAttrSelection([]string{"Name", "Size"})
+	iter := s.bucket.Objects(ctx, query)
+	for {
+		attrs, err := iter.Next()
+		if err == iterator.Done {
+			break
+		}
+		if err != nil {
+			return errors.Trace(err)
+		}
+		// when walk on specify directory, the result include storage.Prefix,
+		// which can not be reuse in other API(Open/Read) directly.
+		// so we use TrimPrefix to filter Prefix for next Open/Read.
+		path := strings.TrimPrefix(attrs.Name, s.gcs.Prefix)
+		if err = fn(path, attrs.Size); err != nil {
+			return errors.Trace(err)
+		}
+	}
+	return nil
+>>>>>>> ec59c7b6 (lightning: cherry-pick some PRs  (#1458))
 }
 
 func (s *gcsStorage) URI() string {

pkg/storage/gcs_test.go

@@ -4,7 +4,12 @@ package storage
 
 import (
 	"context"
+<<<<<<< HEAD
 	"io/ioutil"
+=======
+	"fmt"
+	"io"
+>>>>>>> ec59c7b6 (lightning: cherry-pick some PRs  (#1458))
 	"os"
 
 	"github.com/fsouza/fake-gcs-server/fakestorage"
@@ -59,6 +64,95 @@ func (r *testStorageSuite) TestGCS(c *C) {
 	c.Assert(err, IsNil)
 	c.Assert(exist, IsFalse)
 
+<<<<<<< HEAD
+=======
+	list := ""
+	var totalSize int64 = 0
+	err = stg.WalkDir(ctx, nil, func(name string, size int64) error {
+		list += name
+		totalSize += size
+		return nil
+	})
+	c.Assert(err, IsNil)
+	c.Assert(list, Equals, "keykey1key2")
+	c.Assert(totalSize, Equals, int64(42))
+
+	// test 1003 files
+	totalSize = 0
+	for i := 0; i < 1000; i += 1 {
+		err = stg.WriteFile(ctx, fmt.Sprintf("f%d", i), []byte("data"))
+		c.Assert(err, IsNil)
+	}
+	filesSet := make(map[string]struct{}, 1003)
+	err = stg.WalkDir(ctx, nil, func(name string, size int64) error {
+		filesSet[name] = struct{}{}
+		totalSize += size
+		return nil
+	})
+	c.Assert(err, IsNil)
+	c.Assert(totalSize, Equals, int64(42+4000))
+	_, ok := filesSet["key"]
+	c.Assert(ok, IsTrue)
+	_, ok = filesSet["key1"]
+	c.Assert(ok, IsTrue)
+	_, ok = filesSet["key2"]
+	c.Assert(ok, IsTrue)
+	for i := 0; i < 1000; i += 1 {
+		_, ok = filesSet[fmt.Sprintf("f%d", i)]
+		c.Assert(ok, IsTrue)
+	}
+
+	efr, err := stg.Open(ctx, "key2")
+	c.Assert(err, IsNil)
+
+	p := make([]byte, 10)
+	n, err := efr.Read(p)
+	c.Assert(err, IsNil)
+	c.Assert(n, Equals, 10)
+	c.Assert(string(p), Equals, "data222233")
+
+	p = make([]byte, 40)
+	n, err = efr.Read(p)
+	c.Assert(err, IsNil)
+	c.Assert(n, Equals, 23)
+	c.Assert(string(p[:23]), Equals, "46757222222222289722222")
+
+	p = make([]byte, 5)
+	offs, err := efr.Seek(3, io.SeekStart)
+	c.Assert(err, IsNil)
+	c.Assert(offs, Equals, int64(3))
+
+	n, err = efr.Read(p)
+	c.Assert(err, IsNil)
+	c.Assert(n, Equals, 5)
+	c.Assert(string(p), Equals, "a2222")
+
+	p = make([]byte, 5)
+	offs, err = efr.Seek(3, io.SeekCurrent)
+	c.Assert(err, IsNil)
+	c.Assert(offs, Equals, int64(11))
+
+	n, err = efr.Read(p)
+	c.Assert(err, IsNil)
+	c.Assert(n, Equals, 5)
+	c.Assert(string(p), Equals, "67572")
+
+	/* Since fake_gcs_server hasn't support for negative offset yet.
+	p = make([]byte, 5)
+	offs, err = efr.Seek(int64(-7), io.SeekEnd)
+	c.Assert(err, IsNil)
+	c.Assert(offs, Equals, int64(-7))
+
+	n, err = efr.Read(p)
+	c.Assert(err, IsNil)
+	c.Assert(n, Equals, 5)
+	c.Assert(string(p), Equals, "97222")
+	*/
+
+	err = efr.Close()
+	c.Assert(err, IsNil)
+
+>>>>>>> ec59c7b6 (lightning: cherry-pick some PRs  (#1458))
 	c.Assert(stg.URI(), Equals, "gcs://testbucket/a/b/")
 }