Azure存储Blob类型(CloudBlobContainer，CloudBlobClient等)和线程安全 [英] Azure Storage Blob types (CloudBlobContainer, CloudBlobClient, etc.) and thread safety

问题描述

我正在开发一个Azure应用程序，该应用程序有时需要将大量小Blob上传(下载)到单个容器(超过1k Blob，每个Blob小于1 Mb).为了加快此过程，我想使用多个线程来上传(下载)blob.

I am developing an azure application which needs at some point to upload(download) a large amount of small blobs to a single container (more than 1k blobs, less than 1 Mb each). In order to speed up this process I'd like to use multiple threads for uploading(downloading) blobs.

这是我用于上传单个Blob的例程:

This is routine I use for uploading single blob:

CloudStorageAccount storageAccount = CloudStorageAccount.Parse(ConnectionString);
CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient();
CloudBlobContainer blobContainer = 
    blobClient.GetContainerReference(ContainerName);
blobContainer.CreateIfNotExist();

CloudBlob blob = blobContainer.GetBlobReference(Id);
blob.UploadByteArray(Data);

对于MSDN上面的代码中使用的每种类型，请说以下:

For each type used in the code above MSDN says following:

此类型的任何公共静态(在Visual Basic中为Shared)成员都是 线程安全.不保证任何实例成员都是线程 安全.

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

这是否意味着我需要在每个线程中执行以下代码?或者也许我只能执行一次，并在不同线程之间共享一个CloudBlobContainer实例?

Does it mean that I need to execute following code in every thread? Or maybe I can execute it only once and share single instance of CloudBlobContainer among different threads?

CloudStorageAccount storageAccount = CloudStorageAccount.Parse(ConnectionString);
CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient();
CloudBlobContainer blobContainer = 
    blobClient.GetContainerReference(ContainerName);

我真的很高兴在不同线程中使用CloudBlobContainer的单个实例，否则会严重减慢整个上传(下载)过程.

I would be really happy to use single instance of CloudBlobContainer in different threads otherwise it seriously slows down the whole uploading(downloading) process.

推荐答案

只要您不尝试对容器本身执行更新，就应该很好地共享一个Blob容器引用(即使这样，我也认为这样做会在大多数情况下(如列表)仍然可以).实际上，如果确定容器引用存在，您甚至根本不需要容器引用:

You should be fine sharing a single blob container reference as long as you are not trying to perform an update on the container itself (even then, I think it would still be fine in most scenarios like List). In fact, you don't really even need the container reference if you are sure it exists:

client.GetContainerReference("foo").GetBlobReference("bar");
client.GetBlobReference("foo/bar");  //same

如您所见，获取容器引用的唯一原因是是否要对容器本身执行操作(列表，删除等).如果将Blob引用保留在单独的线程中，就可以了.

As you can see, the only reason to get a container reference is if you want to perform an operation on the container itself (list, delete, etc.). If you keep the blob references in separate threads, you will be fine.

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