lightning: cherry-pick some PRs

pkg/lightning/mydump/region.go

@@ -30,7 +30,11 @@ import (
 	"github.com/pingcap/br/pkg/utils"
 )
 
-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
@@ -268,7 +272,10 @@ 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
 	}
@@ -359,6 +366,9 @@ 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

@@ -332,3 +332,59 @@ func (s *testMydumpRegionSuite) TestSplitLargeFileWithCustomTerminator(c *C) {
 		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)
+	}
+}

pkg/storage/gcs.go

@@ -174,11 +174,6 @@ func (s *gcsStorage) WalkDir(ctx context.Context, opt *WalkOption, fn func(strin
 		opt = &WalkOption{}
 	}
 
-	maxKeys := int64(1000)
-	if opt.ListCount > 0 {
-		maxKeys = opt.ListCount
-	}
-
 	prefix := path.Join(s.gcs.Prefix, opt.SubDir)
 	if len(prefix) > 0 && !strings.HasSuffix(prefix, "/") {
 		prefix += "/"
@@ -188,7 +183,7 @@ func (s *gcsStorage) WalkDir(ctx context.Context, opt *WalkOption, fn func(strin
 	// only need each object's name and size
 	query.SetAttrSelection([]string{"Name", "Size"})
 	iter := s.bucket.Objects(ctx, query)
-	for i := int64(0); i != maxKeys; i++ {
+	for {
 		attrs, err := iter.Next()
 		if err == iterator.Done {
 			break

pkg/storage/gcs_test.go

@@ -4,6 +4,7 @@ package storage
 
 import (
 	"context"
+	"fmt"
 	"io"
 	"os"
 
@@ -76,6 +77,31 @@ func (r *testStorageSuite) TestGCS(c *C) {
 	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)
 

pkg/storage/s3.go

@@ -29,6 +29,7 @@ import (
 	"go.uber.org/zap"
 
 	berrors "github.com/pingcap/br/pkg/errors"
+	"github.com/pingcap/br/pkg/logutil"
 )
 
 const (
@@ -654,6 +655,19 @@ func (r *s3ObjectReader) Seek(offset int64, whence int) (int64, error) {
 
 	if realOffset == r.pos {
 		return realOffset, nil
+	} else if realOffset >= r.rangeInfo.Size {
+		// See: https://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.35
+		// because s3's GetObject interface doesn't allow get a range that matches zero length data,
+		// so if the position is out of range, we need to always return io.EOF after the seek operation.
+
+		// close current read and open a new one which target offset
+		if err := r.reader.Close(); err != nil {
+			log.L().Warn("close s3 reader failed, will ignore this error", logutil.ShortError(err))
+		}
+
+		r.reader = io.NopCloser(bytes.NewReader(nil))
+		r.pos = r.rangeInfo.Size
+		return r.pos, nil
 	}
 
 	// if seek ahead no more than 64k, we discard these data

pkg/storage/s3_test.go

@@ -694,6 +694,15 @@ func (s *s3Suite) TestOpenSeek(c *C) {
 	c.Assert(err, IsNil)
 	c.Assert(n, Equals, 100)
 	c.Assert(slice, DeepEquals, someRandomBytes[990100:990200])
+
+	// test seek to the file end or bigger positions
+	for _, p := range []int64{1000000, 1000001, 2000000} {
+		offset, err = reader.Seek(p, io.SeekStart)
+		c.Assert(offset, Equals, int64(1000000))
+		c.Assert(err, IsNil)
+		_, err := reader.Read(slice)
+		c.Assert(err, Equals, io.EOF)
+	}
 }
 
 type limitedBytesReader struct {