Remove partName, partETag requirement (#9044)

This is a precursor change before versioning,
removes/deprecates the requirement of remembering
partName and partETag which are not useful after
a multipart transaction has finished.

This PR reduces the overall size of the backend
JSON for large file uploads.

cmd/admin-handlers_test.go

@@ -263,6 +263,7 @@ func TestAdminServerInfo(t *testing.T) {
 	if err != nil {
 		t.Fatal("Failed to initialize a single node XL backend for admin handler tests.")
 	}
+
 	defer adminTestBed.TearDown()
 
 	// Initialize admin peers to make admin RPC calls.

cmd/encryption-v1_test.go

@@ -280,15 +280,11 @@ func TestGetDecryptedRange_Issue50(t *testing.T) {
 		Parts: []ObjectPartInfo{
 			{
 				Number:     1,
-				Name:       "part.1",
-				ETag:       "etag1",
 				Size:       297580380,
 				ActualSize: 297435132,
 			},
 			{
 				Number:     2,
-				Name:       "part.2",
-				ETag:       "etag2",
 				Size:       297580380,
 				ActualSize: 297435132,
 			},

cmd/fs-v1-multipart.go

@@ -575,7 +575,6 @@ func (fs *FSObjects) CompleteMultipartUpload(ctx context.Context, bucket string,
 
 		fsMeta.Parts[i] = ObjectPartInfo{
 			Number:     part.PartNumber,
-			ETag:       part.ETag,
 			Size:       fi.Size(),
 			ActualSize: actualSize,
 		}

cmd/gateway/s3/gateway-s3-sse.go

@@ -506,7 +506,6 @@ func (l *s3EncObjects) PutObjectPart(ctx context.Context, bucket string, object
 		Number: partID,
 		ETag:   pi.ETag,
 		Size:   pi.Size,
-		Name:   strconv.Itoa(partID),
 	}
 	gwMeta.ETag = data.MD5CurrentHexString() // encrypted ETag
 	gwMeta.Stat.Size = pi.Size

cmd/xl-v1-healing-common.go

@@ -18,6 +18,7 @@ package cmd
 
 import (
 	"context"
+	"fmt"
 	"time"
 
 	"github.com/minio/minio/cmd/logger"
@@ -181,8 +182,9 @@ func disksWithAllParts(ctx context.Context, onlineDisks []StorageAPI, partsMetad
 			// parts. This is considered an outdated disk, since
 			// it needs healing too.
 			for _, part := range partsMetadata[i].Parts {
-				checksumInfo := erasureInfo.GetChecksumInfo(part.Name)
-				err = onlineDisk.VerifyFile(bucket, pathJoin(object, part.Name), erasure.ShardFileSize(part.Size), checksumInfo.Algorithm, checksumInfo.Hash, erasure.ShardSize())
+				checksumInfo := erasureInfo.GetChecksumInfo(part.Number)
+				partPath := pathJoin(object, fmt.Sprintf("part.%d", part.Number))
+				err = onlineDisk.VerifyFile(bucket, partPath, erasure.ShardFileSize(part.Size), checksumInfo.Algorithm, checksumInfo.Hash, erasure.ShardSize())
 				if err != nil {
 					if !IsErr(err, []error{
 						errFileNotFound,
@@ -198,7 +200,8 @@ func disksWithAllParts(ctx context.Context, onlineDisks []StorageAPI, partsMetad
 			}
 		case madmin.HealNormalScan:
 			for _, part := range partsMetadata[i].Parts {
-				_, err := onlineDisk.StatFile(bucket, pathJoin(object, part.Name))
+				partPath := pathJoin(object, fmt.Sprintf("part.%d", part.Number))
+				_, err := onlineDisk.StatFile(bucket, partPath)
 				if err != nil {
 					dataErrs[i] = err
 					break

cmd/xl-v1-healing-common_test.go

@@ -19,6 +19,7 @@ package cmd
 import (
 	"bytes"
 	"context"
+	"fmt"
 	"os"
 	"path/filepath"
 	"testing"
@@ -317,8 +318,8 @@ func TestDisksWithAllParts(t *testing.T) {
 	diskFailures[15] = "part.1"
 
 	for diskIndex, partName := range diskFailures {
-		for _, info := range partsMetadata[diskIndex].Erasure.Checksums {
-			if info.Name == partName {
+		for i := range partsMetadata[diskIndex].Erasure.Checksums {
+			if fmt.Sprintf("part.%d", i+1) == partName {
 				filePath := pathJoin(xlDisks[diskIndex].String(), bucket, object, partName)
 				f, err := os.OpenFile(filePath, os.O_WRONLY|os.O_SYNC, 0)
 				if err != nil {

cmd/xl-v1-healing.go

@@ -388,26 +388,27 @@ func (xl xlObjects) healObject(ctx context.Context, bucket string, object string
 
 	erasureInfo := latestMeta.Erasure
 	for partIndex := 0; partIndex < len(latestMeta.Parts); partIndex++ {
-		partName := latestMeta.Parts[partIndex].Name
 		partSize := latestMeta.Parts[partIndex].Size
 		partActualSize := latestMeta.Parts[partIndex].ActualSize
 		partNumber := latestMeta.Parts[partIndex].Number
 		tillOffset := erasure.ShardFileTillOffset(0, partSize, partSize)
 		readers := make([]io.ReaderAt, len(latestDisks))
-		checksumAlgo := erasureInfo.GetChecksumInfo(partName).Algorithm
+		checksumAlgo := erasureInfo.GetChecksumInfo(partNumber).Algorithm
 		for i, disk := range latestDisks {
 			if disk == OfflineDisk {
 				continue
 			}
-			checksumInfo := partsMetadata[i].Erasure.GetChecksumInfo(partName)
-			readers[i] = newBitrotReader(disk, bucket, pathJoin(object, partName), tillOffset, checksumAlgo, checksumInfo.Hash, erasure.ShardSize())
+			checksumInfo := partsMetadata[i].Erasure.GetChecksumInfo(partNumber)
+			partPath := pathJoin(object, fmt.Sprintf("part.%d", partNumber))
+			readers[i] = newBitrotReader(disk, bucket, partPath, tillOffset, checksumAlgo, checksumInfo.Hash, erasure.ShardSize())
 		}
 		writers := make([]io.Writer, len(outDatedDisks))
 		for i, disk := range outDatedDisks {
 			if disk == OfflineDisk {
 				continue
 			}
-			writers[i] = newBitrotWriter(disk, minioMetaTmpBucket, pathJoin(tmpID, partName), tillOffset, checksumAlgo, erasure.ShardSize())
+			partPath := pathJoin(tmpID, fmt.Sprintf("part.%d", partNumber))
+			writers[i] = newBitrotWriter(disk, minioMetaTmpBucket, partPath, tillOffset, checksumAlgo, erasure.ShardSize())
 		}
 		hErr := erasure.Heal(ctx, readers, writers, partSize)
 		closeBitrotReaders(readers)
@@ -428,8 +429,12 @@ func (xl xlObjects) healObject(ctx context.Context, bucket string, object string
 				disksToHealCount--
 				continue
 			}
-			partsMetadata[i].AddObjectPart(partNumber, partName, "", partSize, partActualSize)
-			partsMetadata[i].Erasure.AddChecksumInfo(ChecksumInfo{partName, checksumAlgo, bitrotWriterSum(writers[i])})
+			partsMetadata[i].AddObjectPart(partNumber, "", partSize, partActualSize)
+			partsMetadata[i].Erasure.AddChecksumInfo(ChecksumInfo{
+				PartNumber: partNumber,
+				Algorithm:  checksumAlgo,
+				Hash:       bitrotWriterSum(writers[i]),
+			})
 		}
 
 		// If all disks are having errors, we give up.

cmd/xl-v1-healing_test.go

@@ -60,6 +60,10 @@ func TestUndoMakeBucket(t *testing.T) {
 }
 
 func TestHealObjectCorrupted(t *testing.T) {
+	resetGlobalHealState()
+
+	defer resetGlobalHealState()
+
 	nDisks := 16
 	fsDirs, err := getRandomDisks(nDisks)
 	if err != nil {

cmd/xl-v1-metadata.go

@@ -21,6 +21,7 @@ import (
 	"context"
 	"encoding/hex"
 	"encoding/json"
+	"fmt"
 	"net/http"
 	"path"
 	"sort"
@@ -38,9 +39,8 @@ const erasureAlgorithmKlauspost = "klauspost/reedsolomon/vandermonde"
 // ObjectPartInfo Info of each part kept in the multipart metadata
 // file after CompleteMultipartUpload() is called.
 type ObjectPartInfo struct {
-	Number     int    `json:"number"`
-	Name       string `json:"name"`
 	ETag       string `json:"etag,omitempty"`
+	Number     int    `json:"number"`
 	Size       int64  `json:"size"`
 	ActualSize int64  `json:"actualSize"`
 }
@@ -54,7 +54,7 @@ func (t byObjectPartNumber) Less(i, j int) bool { return t[i].Number < t[j].Numb
 
 // ChecksumInfo - carries checksums of individual scattered parts per disk.
 type ChecksumInfo struct {
-	Name      string
+	PartNumber int
 	Algorithm  BitrotAlgorithm
 	Hash       []byte
 }
@@ -68,7 +68,7 @@ type checksumInfoJSON struct {
 // MarshalJSON marshals the ChecksumInfo struct
 func (c ChecksumInfo) MarshalJSON() ([]byte, error) {
 	info := checksumInfoJSON{
-		Name:      c.Name,
+		Name:      fmt.Sprintf("part.%d", c.PartNumber),
 		Algorithm: c.Algorithm.String(),
 		Hash:      hex.EncodeToString(c.Hash),
 	}
@@ -86,9 +86,11 @@ func (c *ChecksumInfo) UnmarshalJSON(data []byte) error {
 	if err != nil {
 		return err
 	}
-	c.Name = info.Name
 	c.Algorithm = BitrotAlgorithmFromString(info.Algorithm)
 	c.Hash = sum
+	if _, err = fmt.Sscanf(info.Name, "part.%d", &c.PartNumber); err != nil {
+		return err
+	}
 
 	if !c.Algorithm.Available() {
 		logger.LogIf(context.Background(), errBitrotHashAlgoInvalid)
@@ -118,7 +120,7 @@ type ErasureInfo struct {
 // AddChecksumInfo adds a checksum of a part.
 func (e *ErasureInfo) AddChecksumInfo(ckSumInfo ChecksumInfo) {
 	for i, sum := range e.Checksums {
-		if sum.Name == ckSumInfo.Name {
+		if sum.PartNumber == ckSumInfo.PartNumber {
 			e.Checksums[i] = ckSumInfo
 			return
 		}
@@ -127,10 +129,10 @@ func (e *ErasureInfo) AddChecksumInfo(ckSumInfo ChecksumInfo) {
 }
 
 // GetChecksumInfo - get checksum of a part.
-func (e ErasureInfo) GetChecksumInfo(partName string) (ckSum ChecksumInfo) {
-	// Return the checksum.
+func (e ErasureInfo) GetChecksumInfo(partNumber int) (ckSum ChecksumInfo) {
 	for _, sum := range e.Checksums {
-		if sum.Name == partName {
+		if sum.PartNumber == partNumber {
+			// Return the checksum
 			return sum
 		}
 	}
@@ -279,10 +281,9 @@ func objectPartIndex(parts []ObjectPartInfo, partNumber int) int {
 }
 
 // AddObjectPart - add a new object part in order.
-func (m *xlMetaV1) AddObjectPart(partNumber int, partName string, partETag string, partSize int64, actualSize int64) {
+func (m *xlMetaV1) AddObjectPart(partNumber int, partETag string, partSize int64, actualSize int64) {
 	partInfo := ObjectPartInfo{
 		Number:     partNumber,
-		Name:       partName,
 		ETag:       partETag,
 		Size:       partSize,
 		ActualSize: actualSize,
@@ -330,8 +331,8 @@ func getXLMetaInQuorum(ctx context.Context, metaArr []xlMetaV1, modTime time.Tim
 	for i, meta := range metaArr {
 		if meta.IsValid() && meta.Stat.ModTime.Equal(modTime) {
 			h := sha256.New()
-			for _, p := range meta.Parts {
-				h.Write([]byte(p.Name))
+			for _, part := range meta.Parts {
+				h.Write([]byte(fmt.Sprintf("part.%d", part.Number)))
 			}
 			metaHashes[i] = hex.EncodeToString(h.Sum(nil))
 		}

cmd/xl-v1-metadata_test.go

@@ -21,7 +21,6 @@ import (
 	"context"
 	"os"
 	"path"
-	"strconv"
 	"testing"
 	"time"
 
@@ -218,8 +217,7 @@ func TestAddObjectPart(t *testing.T) {
 	// Test them.
 	for _, testCase := range testCases {
 		if testCase.expectedIndex > -1 {
-			partNumString := strconv.Itoa(testCase.partNum)
-			xlMeta.AddObjectPart(testCase.partNum, "part."+partNumString, "etag."+partNumString, int64(testCase.partNum+humanize.MiByte), ActualSize)
+			xlMeta.AddObjectPart(testCase.partNum, "", int64(testCase.partNum+humanize.MiByte), ActualSize)
 		}
 
 		if index := objectPartIndex(xlMeta.Parts, testCase.partNum); index != testCase.expectedIndex {
@@ -250,8 +248,7 @@ func TestObjectPartIndex(t *testing.T) {
 
 	// Add some parts for testing.
 	for _, testCase := range testCases {
-		partNumString := strconv.Itoa(testCase.partNum)
-		xlMeta.AddObjectPart(testCase.partNum, "part."+partNumString, "etag."+partNumString, int64(testCase.partNum+humanize.MiByte), ActualSize)
+		xlMeta.AddObjectPart(testCase.partNum, "", int64(testCase.partNum+humanize.MiByte), ActualSize)
 	}
 
 	// Add failure test case.
@@ -279,8 +276,7 @@ func TestObjectToPartOffset(t *testing.T) {
 	// Add some parts for testing.
 	// Total size of all parts is 5,242,899 bytes.
 	for _, partNum := range []int{1, 2, 4, 5, 7} {
-		partNumString := strconv.Itoa(partNum)
-		xlMeta.AddObjectPart(partNum, "part."+partNumString, "etag."+partNumString, int64(partNum+humanize.MiByte), ActualSize)
+		xlMeta.AddObjectPart(partNum, "", int64(partNum+humanize.MiByte), ActualSize)
 	}
 
 	testCases := []struct {

cmd/xl-v1-multipart.go

@@ -55,8 +55,8 @@ func (xl xlObjects) checkUploadIDExists(ctx context.Context, bucket, object, upl
 }
 
 // Removes part given by partName belonging to a mulitpart upload from minioMetaBucket
-func (xl xlObjects) removeObjectPart(bucket, object, uploadID, partName string) {
-	curpartPath := path.Join(bucket, object, uploadID, partName)
+func (xl xlObjects) removeObjectPart(bucket, object, uploadID string, partNumber int) {
+	curpartPath := pathJoin(bucket, object, uploadID, fmt.Sprintf("part.%d", partNumber))
 	storageDisks := xl.getDisks()
 
 	g := errgroup.WithNErrs(len(storageDisks))
@@ -391,7 +391,7 @@ func (xl xlObjects) PutObjectPart(ctx context.Context, bucket, object, uploadID
 	md5hex := r.MD5CurrentHexString()
 
 	// Add the current part.
-	xlMeta.AddObjectPart(partID, partSuffix, md5hex, n, data.ActualSize())
+	xlMeta.AddObjectPart(partID, md5hex, n, data.ActualSize())
 
 	for i, disk := range onlineDisks {
 		if disk == OfflineDisk {
@@ -399,7 +399,11 @@ func (xl xlObjects) PutObjectPart(ctx context.Context, bucket, object, uploadID
 		}
 		partsMetadata[i].Stat = xlMeta.Stat
 		partsMetadata[i].Parts = xlMeta.Parts
-		partsMetadata[i].Erasure.AddChecksumInfo(ChecksumInfo{partSuffix, DefaultBitrotAlgorithm, bitrotWriterSum(writers[i])})
+		partsMetadata[i].Erasure.AddChecksumInfo(ChecksumInfo{
+			PartNumber: partID,
+			Algorithm:  DefaultBitrotAlgorithm,
+			Hash:       bitrotWriterSum(writers[i]),
+		})
 	}
 
 	// Write all the checksum metadata.
@@ -421,8 +425,8 @@ func (xl xlObjects) PutObjectPart(ctx context.Context, bucket, object, uploadID
 	// Return success.
 	return PartInfo{
 		PartNumber:   partID,
-		LastModified: xlMeta.Stat.ModTime,
 		ETag:         md5hex,
+		LastModified: xlMeta.Stat.ModTime,
 		Size:         xlMeta.Stat.Size,
 		ActualSize:   data.ActualSize(),
 	}, nil
@@ -630,7 +634,6 @@ func (xl xlObjects) CompleteMultipartUpload(ctx context.Context, bucket string,
 		xlMeta.Parts[i] = ObjectPartInfo{
 			Number:     part.PartNumber,
 			Size:       currentXLMeta.Parts[partIdx].Size,
-			Name:       fmt.Sprintf("part.%d", part.PartNumber),
 			ActualSize: currentXLMeta.Parts[partIdx].ActualSize,
 		}
 	}
@@ -701,7 +704,7 @@ func (xl xlObjects) CompleteMultipartUpload(ctx context.Context, bucket string,
 			// Request 3: PutObjectPart 2
 			// Request 4: CompleteMultipartUpload --part 2
 			// N.B. 1st part is not present. This part should be removed from the storage.
-			xl.removeObjectPart(bucket, object, uploadID, curpart.Name)
+			xl.removeObjectPart(bucket, object, uploadID, curpart.Number)
 		}
 	}
 

cmd/xl-v1-object.go

@@ -19,6 +19,7 @@ package cmd
 import (
 	"bytes"
 	"context"
+	"fmt"
 	"io"
 	"net/http"
 	"path"
@@ -264,8 +265,10 @@ func (xl xlObjects) getObject(ctx context.Context, bucket, object string, startO
 		if length == totalBytesRead {
 			break
 		}
+
+		partNumber := xlMeta.Parts[partIndex].Number
+
 		// Save the current part name and size.
-		partName := xlMeta.Parts[partIndex].Name
 		partSize := xlMeta.Parts[partIndex].Size
 
 		partLength := partSize - partOffset
@@ -281,8 +284,10 @@ func (xl xlObjects) getObject(ctx context.Context, bucket, object string, startO
 			if disk == OfflineDisk {
 				continue
 			}
-			checksumInfo := metaArr[index].Erasure.GetChecksumInfo(partName)
-			readers[index] = newBitrotReader(disk, bucket, pathJoin(object, partName), tillOffset, checksumInfo.Algorithm, checksumInfo.Hash, erasure.ShardSize())
+			checksumInfo := metaArr[index].Erasure.GetChecksumInfo(partNumber)
+			partPath := pathJoin(object, fmt.Sprintf("part.%d", partNumber))
+			readers[index] = newBitrotReader(disk, bucket, partPath, tillOffset,
+				checksumInfo.Algorithm, checksumInfo.Hash, erasure.ShardSize())
 		}
 		err := erasure.Decode(ctx, writer, readers, partOffset, partLength, partSize)
 		// Note: we should not be defer'ing the following closeBitrotReaders() call as we are inside a for loop i.e if we use defer, we would accumulate a lot of open files by the time
@@ -596,8 +601,12 @@ func (xl xlObjects) putObject(ctx context.Context, bucket string, object string,
 			onlineDisks[i] = nil
 			continue
 		}
-		partsMetadata[i].AddObjectPart(1, partName, "", n, data.ActualSize())
-		partsMetadata[i].Erasure.AddChecksumInfo(ChecksumInfo{partName, DefaultBitrotAlgorithm, bitrotWriterSum(w)})
+		partsMetadata[i].AddObjectPart(1, "", n, data.ActualSize())
+		partsMetadata[i].Erasure.AddChecksumInfo(ChecksumInfo{
+			PartNumber: 1,
+			Algorithm:  DefaultBitrotAlgorithm,
+			Hash:       bitrotWriterSum(w),
+		})
 	}
 
 	// Save additional erasureMetadata.

cmd/xl-v1-utils_test.go

@@ -22,7 +22,6 @@ import (
 	"encoding/hex"
 	"encoding/json"
 	"reflect"
-	"strconv"
 	"testing"
 
 	humanize "github.com/dustin/go-humanize"
@@ -164,25 +163,23 @@ func newTestXLMetaV1() xlMetaV1 {
 	return xlMeta
 }
 
-func (m *xlMetaV1) AddTestObjectCheckSum(checkSumNum int, name string, algorithm BitrotAlgorithm, hash string) {
+func (m *xlMetaV1) AddTestObjectCheckSum(partNumber int, algorithm BitrotAlgorithm, hash string) {
 	checksum, err := hex.DecodeString(hash)
 	if err != nil {
 		panic(err)
 	}
-	m.Erasure.Checksums[checkSumNum] = ChecksumInfo{name, algorithm, checksum}
+	m.Erasure.Checksums[partNumber-1] = ChecksumInfo{partNumber, algorithm, checksum}
 }
 
 // AddTestObjectPart - add a new object part in order.
-func (m *xlMetaV1) AddTestObjectPart(partNumber int, partName string, partETag string, partSize int64) {
+func (m *xlMetaV1) AddTestObjectPart(partNumber int, partSize int64) {
 	partInfo := ObjectPartInfo{
 		Number: partNumber,
-		Name:   partName,
-		ETag:   partETag,
 		Size:   partSize,
 	}
 
 	// Proceed to include new part info.
-	m.Parts[partNumber] = partInfo
+	m.Parts[partNumber-1] = partInfo
 }
 
 // Constructs xlMetaV1{} for given number of parts and converts it into bytes.
@@ -203,11 +200,10 @@ func getSampleXLMeta(totalParts int) xlMetaV1 {
 	// total number of parts.
 	xlMeta.Parts = make([]ObjectPartInfo, totalParts)
 	for i := 0; i < totalParts; i++ {
-		partName := "part." + strconv.Itoa(i+1)
 		// hard coding hash and algo value for the checksum, Since we are benchmarking the parsing of xl.json the magnitude doesn't affect the test,
 		// The magnitude doesn't make a difference, only the size does.
-		xlMeta.AddTestObjectCheckSum(i, partName, BLAKE2b512, "a23f5eff248c4372badd9f3b2455a285cd4ca86c3d9a570b091d3fc5cd7ca6d9484bbea3f8c5d8d4f84daae96874419eda578fd736455334afbac2c924b3915a")
-		xlMeta.AddTestObjectPart(i, partName, "d3fdd79cc3efd5fe5c068d7be397934b", 67108864)
+		xlMeta.AddTestObjectCheckSum(i+1, BLAKE2b512, "a23f5eff248c4372badd9f3b2455a285cd4ca86c3d9a570b091d3fc5cd7ca6d9484bbea3f8c5d8d4f84daae96874419eda578fd736455334afbac2c924b3915a")
+		xlMeta.AddTestObjectPart(i+1, 67108864)
 	}
 	return xlMeta
 }
@@ -256,8 +252,8 @@ func compareXLMetaV1(t *testing.T, unMarshalXLMeta, jsoniterXLMeta xlMetaV1) {
 		t.Errorf("Expected the size of Erasure Checksums to be %d, but got %d.", len(unMarshalXLMeta.Erasure.Checksums), len(jsoniterXLMeta.Erasure.Checksums))
 	} else {
 		for i := 0; i < len(unMarshalXLMeta.Erasure.Checksums); i++ {
-			if unMarshalXLMeta.Erasure.Checksums[i].Name != jsoniterXLMeta.Erasure.Checksums[i].Name {
-				t.Errorf("Expected the Erasure Checksum Name to be \"%s\", got \"%s\".", unMarshalXLMeta.Erasure.Checksums[i].Name, jsoniterXLMeta.Erasure.Checksums[i].Name)
+			if unMarshalXLMeta.Erasure.Checksums[i].PartNumber != jsoniterXLMeta.Erasure.Checksums[i].PartNumber {
+				t.Errorf("Expected the Erasure Checksum PartNumber to be \"%d\", got \"%d\".", unMarshalXLMeta.Erasure.Checksums[i].PartNumber, jsoniterXLMeta.Erasure.Checksums[i].PartNumber)
 			}
 			if unMarshalXLMeta.Erasure.Checksums[i].Algorithm != jsoniterXLMeta.Erasure.Checksums[i].Algorithm {
 				t.Errorf("Expected the Erasure Checksum Algorithm to be \"%s\", got \"%s\".", unMarshalXLMeta.Erasure.Checksums[i].Algorithm, jsoniterXLMeta.Erasure.Checksums[i].Algorithm)
@@ -275,12 +271,6 @@ func compareXLMetaV1(t *testing.T, unMarshalXLMeta, jsoniterXLMeta xlMetaV1) {
 		t.Errorf("Expected info of  %d parts to be present, but got %d instead.", len(unMarshalXLMeta.Parts), len(jsoniterXLMeta.Parts))
 	} else {
 		for i := 0; i < len(unMarshalXLMeta.Parts); i++ {
-			if unMarshalXLMeta.Parts[i].Name != jsoniterXLMeta.Parts[i].Name {
-				t.Errorf("Expected the name of part %d to be \"%s\", got \"%s\".", i+1, unMarshalXLMeta.Parts[i].Name, jsoniterXLMeta.Parts[i].Name)
-			}
-			if unMarshalXLMeta.Parts[i].ETag != jsoniterXLMeta.Parts[i].ETag {
-				t.Errorf("Expected the ETag of part %d to be \"%s\", got \"%s\".", i+1, unMarshalXLMeta.Parts[i].ETag, jsoniterXLMeta.Parts[i].ETag)
-			}
 			if unMarshalXLMeta.Parts[i].Number != jsoniterXLMeta.Parts[i].Number {
 				t.Errorf("Expected the number of part %d to be \"%d\", got \"%d\".", i+1, unMarshalXLMeta.Parts[i].Number, jsoniterXLMeta.Parts[i].Number)
 			}