在我的团队的应用程序中发现以下行为:
多个线程尝试使用下面的行在同一个Blob上获取租约:
await blob.AcquireLeaseAsync(TimeSpan.FromSeconds(lockTime), null, null, new BlobRequestOptions() { RetryPolicy = RetryPolicy }, null);
多个线程在大约同一时间成功获得了租约,每个线程都获得了不同的租约。
这是因为AcquireLeaseAsync是NOT thread-safe对吗?
我以为租约是一种锁,因此一次只能授予一个线程吗?
我们试图添加一个租约ID为null的访问条件,这似乎很有帮助。
await blob.AcquireLeaseAsync(TimeSpan.FromSeconds(lockTime), null, new AccessCondition { LeaseId = null}, new BlobRequestOptions() { RetryPolicy = RetryPolicy }, null);
但是不确定是否万无一失,即尝试获取Blob上的租约时是否有多个线程可以通过此访问条件?
下面是我用来生成此问题的代码:
class Program
{
static void Main(string[] args)
{
Console.WriteLine("started");
var storageConnStr = "";
var client = CloudStorageAccount.Parse(storageConnStr).CreateCloudBlobClient();
var container = client.GetContainerReference("test");
var blob = container.GetBlobReference("Program.cs");
List<Task> list = new List<Task>();
for (int i = 0; i < 100; i++)
{
list.Add(Task.Run(() => AcquireLease(blob)));
}
Task.WhenAll(list).Wait();
}
static void AcquireLease(CloudBlob blob)
{
try
{
var id = blob.AcquireLeaseAsync(TimeSpan.FromSeconds(30), null, null, null, null).Result;
Console.WriteLine($"Successfully acquired lease on thread {Thread.CurrentThread.ManagedThreadId}, lease id {id}, time is {DateTime.UtcNow}");
}
catch (Exception)
{
Console.WriteLine($"Got exception at {Thread.CurrentThread.ManagedThreadId}");
}
}
}
示例输出:
最佳答案
将var id = blob.AcquireLeaseAsync
更改为var id = await blob.AcquireLeaseAsync
关于c# - 同时在同一 azure Blob上获取租约,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/53235616/