preserve metadata multipart restore (#12139)

avoid re-read of xl.meta instead just use
the success criteria from PutObjectPart()
and check the ETag matches per Part, if
they match then the parts have been
successfully restored as is.

Signed-off-by: Harshavardhana <harsha@minio.io>

cmd/erasure-multipart.go

@@ -301,12 +301,10 @@ func (er erasureObjects) newMultipartUpload(ctx context.Context, bucket string,
 	partsMetadata := make([]FileInfo, len(onlineDisks))
 
 	fi := newFileInfo(pathJoin(bucket, object), dataDrives, parityDrives)
-	if opts.Versioned {
 	fi.VersionID = opts.VersionID
-		if fi.VersionID == "" {
+	if opts.Versioned && fi.VersionID == "" {
 		fi.VersionID = mustGetUUID()
 	}
-	}
 	fi.DataDir = mustGetUUID()
 
 	// Initialize erasure metadata.

cmd/erasure-object.go

@@ -1433,6 +1433,7 @@ func (er erasureObjects) restoreTransitionedObject(ctx context.Context, bucket s
 	}
 
 	oi = actualfi.ToObjectInfo(bucket, object)
+	ropts := putRestoreOpts(bucket, object, opts.Transition.RestoreRequest, oi)
 	if len(oi.Parts) == 1 {
 		var rs *HTTPRangeSpec
 		gr, err := getTransitionedObjectReader(ctx, bucket, object, rs, http.Header{}, oi, opts)
@@ -1445,15 +1446,16 @@ func (er erasureObjects) restoreTransitionedObject(ctx context.Context, bucket s
 			return setRestoreHeaderFn(oi, toObjectErr(err, bucket, object))
 		}
 		pReader := NewPutObjReader(hashReader)
-		ropts := putRestoreOpts(bucket, object, opts.Transition.RestoreRequest, oi)
 		ropts.UserDefined[xhttp.AmzRestore] = completedRestoreObj(opts.Transition.RestoreExpiry).String()
 		_, err = er.PutObject(ctx, bucket, object, pReader, ropts)
 		return setRestoreHeaderFn(oi, toObjectErr(err, bucket, object))
 	}
-	uploadID, err := er.NewMultipartUpload(ctx, bucket, object, opts)
+
+	uploadID, err := er.NewMultipartUpload(ctx, bucket, object, ropts)
 	if err != nil {
 		return setRestoreHeaderFn(oi, err)
 	}
+
 	var uploadedParts []CompletePart
 	var rs *HTTPRangeSpec
 	// get reader from the warm backend - note that even in the case of encrypted objects, this stream is still encrypted.
@@ -1462,6 +1464,7 @@ func (er erasureObjects) restoreTransitionedObject(ctx context.Context, bucket s
 		return setRestoreHeaderFn(oi, err)
 	}
 	defer gr.Close()
+
 	// rehydrate the parts back on disk as per the original xl.meta prior to transition
 	for _, partInfo := range oi.Parts {
 		hr, err := hash.NewReader(gr, partInfo.Size, "", "", partInfo.Size)
@@ -1478,41 +1481,18 @@ func (er erasureObjects) restoreTransitionedObject(ctx context.Context, bucket s
 		})
 	}
 
-	uploadIDPath := er.getUploadIDDir(bucket, object, uploadID)
-	storageDisks := er.getDisks()
-	// Read metadata associated with the object from all disks.
-	partsMetadata, errs := readAllFileInfo(ctx, storageDisks, minioMetaMultipartBucket, uploadIDPath, "", false)
-
-	// get Quorum for this object
-	_, writeQuorum, err := objectQuorumFromMeta(ctx, partsMetadata, errs, er.defaultParityCount)
-	if err != nil {
-		return setRestoreHeaderFn(oi, toObjectErr(err, bucket, object))
-	}
-
-	reducedErr := reduceWriteQuorumErrs(ctx, errs, objectOpIgnoredErrs, writeQuorum)
-	if reducedErr == errErasureWriteQuorum {
-		return setRestoreHeaderFn(oi, toObjectErr(reducedErr, bucket, object))
-	}
-
-	_, modTime, dataDir := listOnlineDisks(storageDisks, partsMetadata, errs)
-
-	// Pick one from the first valid metadata.
-	fi, err := pickValidFileInfo(ctx, partsMetadata, modTime, dataDir, writeQuorum)
-	if err != nil {
-		return setRestoreHeaderFn(oi, err)
-	}
-	//validate parts created via multipart to transitioned object's parts info in xl.meta
 	partsMatch := true
-	if len(actualfi.Parts) != len(fi.Parts) {
+	// validate parts created via multipart
+	if len(oi.Parts) == len(uploadedParts) {
+		for i, pi := range oi.Parts {
+			if uploadedParts[i].ETag != pi.ETag {
 				partsMatch = false
+				break
 			}
-	if len(actualfi.Parts) == len(fi.Parts) {
+		}
-		for i, pi := range actualfi.Parts {
+	} else {
-			if fi.Parts[i].Size != pi.Size {
 		partsMatch = false
 	}
-		}
-	}
 
 	if !partsMatch {
 		return setRestoreHeaderFn(oi, InvalidObjectState{Bucket: bucket, Object: object})
@@ -1525,6 +1505,7 @@ func (er erasureObjects) restoreTransitionedObject(ctx context.Context, bucket s
 		VersionSuspended: globalBucketVersioningSys.Suspended(bucket),
 	})
 	if err != nil {
+		uploadIDPath := er.getUploadIDDir(bucket, object, uploadID)
 		return setRestoreHeaderFn(oi, toObjectErr(err, minioMetaMultipartBucket, uploadIDPath))
 	}
 	return setRestoreHeaderFn(oi, nil)

cmd/object-api-interface.go

@@ -52,13 +52,13 @@ type ObjectOptions struct {
 	DeleteMarkerReplicationStatus string                 // Is only set in DELETE operations
 	VersionPurgeStatus            VersionPurgeStatusType // Is only set in DELETE operations for delete marker version to be permanently deleted.
 	Transition                    TransitionOptions
+
 	NoLock         bool                                                  // indicates to lower layers if the caller is expecting to hold locks.
 	ProxyRequest   bool                                                  // only set for GET/HEAD in active-active replication scenario
 	ProxyHeaderSet bool                                                  // only set for GET/HEAD in active-active replication scenario
 	ParentIsObject func(ctx context.Context, bucket, parent string) bool // Used to verify if parent is an object.
 
-	// Use the maximum parity (N/2), used when
+	// Use the maximum parity (N/2), used when saving server configuration files
-	// saving server configuration files
 	MaxParity bool
 }