FS/multipart: Fix append-parts to use minioMetaTmpBucket. (#3304)

cmd/fs-v1-background-append.go

@@ -49,9 +49,10 @@ type bgAppendPartsInput struct {
 
 // Identifies an appendParts go-routine.
 type bgAppendPartsInfo struct {
-	inputCh   chan bgAppendPartsInput
-	timeoutCh chan struct{} // closed by appendParts go-routine when it timesout
-	endCh     chan struct{} // closed after complete/abort of upload to end the appendParts go-routine
+	inputCh    chan bgAppendPartsInput
+	timeoutCh  chan struct{} // closed by appendParts go-routine when it timesout
+	abortCh    chan struct{} // closed after abort of upload to end the appendParts go-routine
+	completeCh chan struct{} // closed after complete of upload to end the appendParts go-routine
 }
 
 // Called after a part is uploaded so that it can be appended in the background.
@@ -63,9 +64,10 @@ func (b *backgroundAppend) append(disk StorageAPI, bucket, object, uploadID stri
 		// part of a multipart upload is uploaded.
 		inputCh := make(chan bgAppendPartsInput)
 		timeoutCh := make(chan struct{})
-		endCh := make(chan struct{})
+		abortCh := make(chan struct{})
+		completeCh := make(chan struct{})
 
-		info = bgAppendPartsInfo{inputCh, timeoutCh, endCh}
+		info = bgAppendPartsInfo{inputCh, timeoutCh, abortCh, completeCh}
 		b.infoMap[uploadID] = info
 
 		go b.appendParts(disk, bucket, object, uploadID, info)
@@ -92,6 +94,7 @@ func (b *backgroundAppend) append(disk StorageAPI, bucket, object, uploadID stri
 func (b *backgroundAppend) complete(disk StorageAPI, bucket, object, uploadID string, meta fsMetaV1) error {
 	b.Lock()
 	info, ok := b.infoMap[uploadID]
+	delete(b.infoMap, uploadID)
 	b.Unlock()
 	if !ok {
 		return errPartsMissing
@@ -106,13 +109,13 @@ func (b *backgroundAppend) complete(disk StorageAPI, bucket, object, uploadID st
 	}
 	err := <-errCh
 
-	b.remove(uploadID)
+	close(info.completeCh)
 
 	return err
 }
 
 // Called after complete-multipart-upload or abort-multipart-upload so that the appendParts go-routine is not left dangling.
-func (b *backgroundAppend) remove(uploadID string) {
+func (b *backgroundAppend) abort(uploadID string) {
 	b.Lock()
 	defer b.Unlock()
 	info, ok := b.infoMap[uploadID]
@@ -120,7 +123,7 @@ func (b *backgroundAppend) remove(uploadID string) {
 		return
 	}
 	delete(b.infoMap, uploadID)
-	close(info.endCh)
+	close(info.abortCh)
 }
 
 // This is run as a go-routine that appends the parts in the background.
@@ -155,10 +158,12 @@ func (b *backgroundAppend) appendParts(disk StorageAPI, bucket, object, uploadID
 				}
 				appendMeta.AddObjectPart(part.Number, part.Name, part.ETag, part.Size)
 			}
-		case <-info.endCh:
-			// Either complete-multipart-upload or abort-multipart-upload closed endCh to end the appendParts go-routine.
-			appendFilePath := getFSAppendDataPath(uploadID)
-			disk.DeleteFile(bucket, appendFilePath)
+		case <-info.abortCh:
+			// abort-multipart-upload closed abortCh to end the appendParts go-routine.
+			disk.DeleteFile(minioMetaTmpBucket, uploadID)
+			return
+		case <-info.completeCh:
+			// complete-multipart-upload closed completeCh to end the appendParts go-routine.
 			return
 		case <-time.After(appendPartsTimeout):
 			// Timeout the goroutine to garbage collect its resources. This would happen if the client initiates
@@ -167,8 +172,7 @@ func (b *backgroundAppend) appendParts(disk StorageAPI, bucket, object, uploadID
 			delete(b.infoMap, uploadID)
 			b.Unlock()
 			// Delete the temporary append file as well.
-			appendFilePath := getFSAppendDataPath(uploadID)
-			disk.DeleteFile(bucket, appendFilePath)
+			disk.DeleteFile(minioMetaTmpBucket, uploadID)
 
 			close(info.timeoutCh)
 		}
@@ -178,8 +182,7 @@ func (b *backgroundAppend) appendParts(disk StorageAPI, bucket, object, uploadID
 // Appends the "part" to the append-file inside "tmp/" that finally gets moved to the actual location
 // upon complete-multipart-upload.
 func appendPart(disk StorageAPI, bucket, object, uploadID string, part objectPartInfo) error {
-	partPath := pathJoin(bucket, object, uploadID, part.Name)
-	appendFilePath := getFSAppendDataPath(uploadID)
+	partPath := pathJoin(mpartMetaPrefix, bucket, object, uploadID, part.Name)
 
 	offset := int64(0)
 	totalLeft := part.Size
@@ -196,11 +199,11 @@ func appendPart(disk StorageAPI, bucket, object, uploadID string, part objectPar
 			// the exact size of the file and hence know the size of buf[]
 			// EOF/ErrUnexpectedEOF indicates that the length of file was shorter than part.Size and
 			// hence considered as an error condition.
-			disk.DeleteFile(bucket, appendFilePath)
+			disk.DeleteFile(minioMetaTmpBucket, uploadID)
 			return err
 		}
-		if err = disk.AppendFile(minioMetaBucket, appendFilePath, buf[:n]); err != nil {
-			disk.DeleteFile(bucket, appendFilePath)
+		if err = disk.AppendFile(minioMetaTmpBucket, uploadID, buf[:n]); err != nil {
+			disk.DeleteFile(minioMetaTmpBucket, uploadID)
 			return err
 		}
 		offset += n

cmd/fs-v1-multipart.go

@@ -285,11 +285,6 @@ func partToAppend(fsMeta fsMetaV1, fsAppendMeta fsMetaV1) (part objectPartInfo,
 	return fsMeta.Parts[nextPartIndex], true
 }
 
-// Returns path for the append-file.
-func getFSAppendDataPath(uploadID string) string {
-	return path.Join(minioMetaTmpBucket, uploadID)
-}
-
 // PutObjectPart - reads incoming data until EOF for the part file on
 // an ongoing multipart transaction. Internally incoming data is
 // written to '.minio.sys/tmp' location and safely renamed to
@@ -566,21 +561,20 @@ func (fs fsObjects) CompleteMultipartUpload(bucket string, object string, upload
 		return "", toObjectErr(err, minioMetaMultipartBucket, fsMetaPath)
 	}
 
-	appendFallback := true // In case background appendRoutine() did not append the required parts.
+	appendFallback := true // In case background-append did not append the required parts.
 	if isPartsSame(fsMeta.Parts, parts) {
 		err = fs.bgAppend.complete(fs.storage, bucket, object, uploadID, fsMeta)
 		if err == nil {
 			appendFallback = false
-			fsAppendDataPath := getFSAppendDataPath(uploadID)
-			if err = fs.storage.RenameFile(minioMetaBucket, fsAppendDataPath, bucket, object); err != nil {
-				return "", toObjectErr(traceError(err), minioMetaBucket, fsAppendDataPath)
+			if err = fs.storage.RenameFile(minioMetaTmpBucket, uploadID, bucket, object); err != nil {
+				return "", toObjectErr(traceError(err), minioMetaTmpBucket, uploadID)
 			}
 		}
 	}
 
 	if appendFallback {
-		// appendRoutine could not do append all the required parts, hence we do it here.
-		tempObj := path.Join(minioMetaTmpBucket, uploadID+"-"+"part.1")
+		// background append could not do append all the required parts, hence we do it here.
+		tempObj := uploadID + "-" + "part.1"
 
 		// Allocate staging buffer.
 		var buf = make([]byte, readSizeV1)
@@ -702,9 +696,8 @@ func (fs fsObjects) abortMultipartUpload(bucket, object, uploadID string) error
 	if err := cleanupUploadedParts(bucket, object, uploadID, fs.storage); err != nil {
 		return err
 	}
-	fs.bgAppend.remove(uploadID)
-
-	// remove upload ID in uploads.json
+	fs.bgAppend.abort(uploadID)
+	// remove entry from uploads.json with quorum
 	if err := fs.removeUploadID(bucket, object, uploadID); err != nil {
 		return toObjectErr(err, bucket, object)
 	}