避免覆盖Blob [英] Avoid over-writing blobs AZURE

问题描述

如果我在文件已经存在的同一容器中的天蓝色blob上上传文件，它正在覆盖文件，如何避免覆盖相同文件?下面我要提到的情况...

if i upload a file on azure blob in the same container where the file is existing already, it is over-writing the file, how to avoid overwriting the same? below i am mentioning the scenario...

第1步-将天蓝色的文件"abc.jpg"上传到名为"filecontainer"的容器中

step1 - upload file "abc.jpg" on azure in container called say "filecontainer"

第2步-上传后，尝试将一些具有相同名称的不同文件上传到同一容器中

step2 - once it gets uploaded, try uploading some different file with the same name to the same container

输出-它将使用最新上传的文件覆盖现有文件

Output - it will overwrite existing file with the latest uploaded

我的要求-我想避免这种覆盖，因为不同的人可能会将具有相同名称的文件上传到我的容器中.

My Requirement - i want to avoid this overwrite, as different people may upload files having same name to my container.

请帮助

P.S.

-我不想为不同的用户创建不同的容器

-i do not want to create different containers for different users

-我正在将REST API与Jav​​a一起使用

-i am using REST API with Java

推荐答案

Windows Azure Blob存储支持条件标头，使用该标头可以防止Blob覆盖.您可以在此处阅读有关条件标题的更多信息: http://msdn.microsoft. com/en-us/library/windowsazure/dd179371.aspx .

Windows Azure Blob Storage supports conditional headers using which you can prevent overwriting of blobs. You can read more about conditional headers here: http://msdn.microsoft.com/en-us/library/windowsazure/dd179371.aspx.

由于希望不要覆盖Blob，因此需要指定If-None-Match条件标头并将其值设置为*.这将导致上传操作失败，并显示Precondition Failed (412)错误.

Since you want that a blob should not be overwritten, you would need to specify If-None-Match conditional header and set it's value to *. This would cause the upload operation to fail with Precondition Failed (412) error.

其他想法是在上传之前检查blob的存在(通过获取其属性)，但是我不推荐这种方法，因为它可能会导致一些并发问题.

Other idea would be to check for blob's existence just before uploading (by fetching it's properties) however I would not recommend this approach as it may lead to some concurrency issues.

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