Google Cloud Storage 传播 [英] Google Cloud Storage propagation

问题描述

对 Google Cloud Storage 中的文件所做的更改需要多长时间才能传播?

How long does it take for a change to a file in Google Cloud Storage to propagate?

我遇到了这个非常令人沮丧的问题，我更改了文件的内容并通过 gsutil 重新上传了它，但更改没有显示几个小时.有没有办法强制更改的文件立即传播所有内容?

I'm having this very frustrating problem where I change the contents of a file and re-upload it via gsutil, but the change doesn't show up for several hours. Is there a way to force a changed file to propagate everything immediately?

如果我在 Google Cloud Storage 控制台中查看文件，它会看到新文件，但如果我点击公共 URL，它是旧版本，在某些情况下，是 2 个版本之前.

If I look at the file in the Google Cloud Storage console, it sees the new file, but then if I hit the public URL it's an old version and in some cases, 2 versions ago.

有没有我没有设置的标题?

Is there a header that I'm not setting?

我试过 gsutil -h "Cache-Control: no-cache" cp -a public-read MyFile 并没有帮助，但也许旧文件需要在新的 no 之前过期-缓存版本接管?

I tried gsutil -h "Cache-Control: no-cache" cp -a public-read MyFile and it doesn't help, but maybe the old file needs to expire before the new no-cache version takes over?

我对文件做了一个 curl -I 并取回:

I did a curl -I on the file and get this back:

HTTP/1.1 200 OK
Server: HTTP Upload Server Built on Dec 12 2012 15:53:08 (1355356388)
Expires: Fri, 21 Dec 2012 19:58:39 GMT
Date: Fri, 21 Dec 2012 18:58:39 GMT
Last-Modified: Fri, 21 Dec 2012 18:53:41 GMT
ETag: "66d820174d6de17a278b327e4c3e9b4e"
x-goog-sequence-number: 3
x-goog-generation: 1356116021512000
x-goog-metageneration: 1
Content-Type: application/octet-stream
Content-Language: en
Accept-Ranges: bytes
Content-Length: 160
Cache-Control: public, max-age=3600, no-transform
Age: 3449

这似乎表明它会在一个小时内到期，尽管没有缓存.

Which seems to indicate it will expire in an hour, despite the no-cache.

推荐答案

Google Cloud Storage 提供强大的数据一致性:一旦写入完成，从世界任何地方读取都将获得最新数据.

Google Cloud Storage provides strong data consistency: once a write completes, a read from anywhere in the world will get the most recent data.

但是，如果您启用缓存(默认情况下，对于任何公开可读的对象都是如此)，该对象的读取可以看到与该对象上指定的 Cache-Control max-age 一样旧的对象版本.例如，如果您像这样上传文件:

However, if you enable caching (which by default is true for any publicly readable object), reads of that object can see a version of the object as old as the Cache-Control max-age specified on the object. If, for example, you uploaded the file like this:

gsutil cp -a public-read file gs://my_bucket/file

您可以看到 max-age 为 1 小时(3600 秒):

You can see that the max-age is 1 hour (3600 seconds):

gsutil ls -L gs://my_bucket/file
gs://my_bucket/file:
    Creation time:  Fri, 21 Dec 2012 19:59:57 GMT
    Cache-Control:  public, max-age=3600, no-transform
    Content-Length: 1065
    Content-Type:   text/plain
    ETag:       eb3fb83beedf1efffe5b8e32e8d6a65a
    ...

如果你想阻止一个公开可读的对象被缓存，你可以这样做:

If you want to prevent a publicly readable object from being cached you could do:

gsutil setmeta -h Cache-Control:no-cache gs://my_bucket/file

或者，您可以在对象上设置更短的 max-age:

Alternatively, you could set a shorter max-age on the object:

gsutil setmeta -h 'Cache-Control:public, max-age=600, no-transform'

Mike Schwartz，Google 云存储团队

Mike Schwartz, Google Cloud Storage team

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