fix MinioChunkManager.Exist a exist path return false (#257)

Signed-off-by: wayblink <anyang.wang@zilliz.com>

core/backup_impl_restore_backup.go

@@ -624,7 +624,7 @@ func collectGroupIdsFromSegments(segments []*backuppb.SegmentBackupInfo) []int64
 }
 
 func (b *BackupContext) executeBulkInsert(ctx context.Context, db, coll string, partition string, files []string, endTime int64) error {
-	log.Debug("execute bulk insert",
+	log.Info("execute bulk insert",
 		zap.String("db", db),
 		zap.String("collection", coll),
 		zap.String("partition", partition),
@@ -712,6 +712,10 @@ func (b *BackupContext) getBackupPartitionPaths(ctx context.Context, bucketName
 		log.Warn("check binlog exist fail", zap.Error(err))
 		return []string{}, err
 	}
+	log.Debug("check delta log exist",
+		zap.Int64("partitionID", partition.PartitionId),
+		zap.String("deltaPath", deltaPath),
+		zap.Bool("exist", exist))
 	if !exist {
 		return []string{insertPath, ""}, nil
 	}

core/storage/minio_chunk_manager.go

@@ -210,16 +210,25 @@ func (mcm *MinioChunkManager) MultiWrite(ctx context.Context, bucketName string,
 
 // Exist checks whether chunk is saved to minio storage.
 func (mcm *MinioChunkManager) Exist(ctx context.Context, bucketName string, filePath string) (bool, error) {
-	_, err := mcm.Client.StatObject(ctx, bucketName, filePath, minio.StatObjectOptions{})
+	//_, err := mcm.Client.StatObject(ctx, bucketName, filePath, minio.StatObjectOptions{})
+	paths, _, err := mcm.ListWithPrefix(ctx, bucketName, filePath, false)
 	if err != nil {
 		errResponse := minio.ToErrorResponse(err)
+		log.Warn("MinioChunkManager Exist errResponse",
+			zap.String("bucket", bucketName),
+			zap.String("filePath", filePath),
+			zap.Any("errResponse", errResponse),
+		)
 		if errResponse.Code == "NoSuchKey" {
 			return false, nil
 		}
 		log.Warn("failed to stat object", zap.String("path", filePath), zap.Error(err))
 		return false, err
 	}
-	return true, nil
+	if len(paths) > 0 {
+		return true, nil
+	}
+	return false, nil
 }
 
 // Read reads the minio storage data if exists.