The process cannot access the file because it is being used by another process. #39
Description
下载文件时有个rename操作，在windows系统上会panic，报如下错误：The process cannot access the file because it is being used by another process. 在 createDownloadTempFile 这个函数里调用了 os.Create ，但是没有关闭，加上 file.Close() 后问题得以修复，类似的 checkpoint 文件在创建后也没有调用 Close()。