同时调用相同的静态方法时Hangfire DistributedLockTimeoutException

Question

我有一个网络服务，当发布到，会在Hangfire中排队下载图片，这样如果图片下载失败，Hangfire会自动重试：

[AutomaticRetry(Attempts = 5, OnAttemptsExceeded = AttemptsExceededAction.Delete)]
public static void DownloadImage(string url)
{
    ...
}

每次发布​​Web服务时，它都会添加一些调用此方法的后台作业，如下所示：

Hangfire.BackgroundJob.Enqueue(() => Downloader.DownloadImage(o.SourceURL));

我所看到的是，第一个后台作业成功，其余部分在RAPID继承中失败，即在一秒钟内，比如100个排队的作业将失败分配5次（根据AutomaticRetry属性）

Hangfire任务中的错误是：

Hangfire.Storage.DistributedLockTimeoutException

Timeout expired. The timeout elapsed prior to obtaining a distributed lock on the 'HangFire:Downloader.DownloadImage' resource.

Hangfire.Storage.DistributedLockTimeoutException: Timeout expired. The timeout elapsed prior to obtaining a distributed lock on the 'HangFire:Downloader.DownloadImage' resource.
   at Hangfire.SqlServer.SqlServerDistributedLock.Acquire(IDbConnection connection, String resource, TimeSpan timeout)
   at Hangfire.SqlServer.SqlServerDistributedLock..ctor(SqlServerStorage storage, String resource, TimeSpan timeout)
   at Hangfire.SqlServer.SqlServerConnection.AcquireDistributedLock(String resource, TimeSpan timeout)
   at Hangfire.DisableConcurrentExecutionAttribute.OnPerforming(PerformingContext filterContext)
   at Hangfire.Server.BackgroundJobPerformer.InvokePerformFilter(IServerFilter filter, PerformingContext preContext, Func`1 continuation)