Every ServiceEndpoint has one or more connection groups and the limit is applied to connections in a connection group. NOTE: The connection pool is centrally managed on. The default connection pool limit means that even though you have 20 BlockBlobClient.UploadAsync calls running in parallel only 2 of them would be actually uploading data and the rest would be stuck in the queue. To speed up the process you decided to upload using using 20 parallel threads. Imagine writing a console application that uploads files to Azure Blob Storage. After the maximum number of connections is reached, HTTP requests will be queued until one of the existing connections becomes available again. NET framework is controlled by the ServicePointManager class and the most important fact to remember is that the pool, by default, is limited to 2 connections to a particular endpoint (host+port pair) in non-web applications, and to unlimited connection per endpoint in ASP.NET applications that have autoConfig enabled (without autoConfig the limit is set to 10). NET Core section for details.NET FrameworkĬonnection pooling in the. NOTE: most of this is not applicable for applications using. NET runtime you are using and ways to tune it to make sure connection limits don’t negatively affect your application performance. The post details the specifics of HTTP connection pooling based on the. NET maintains a pool of HTTP connections that can be reused instead of opening a new one for each request. Establishing a connection is an expensive operation that could take longer than the processing of the request itself. Sending an HTTP request requires a socket connection to be established between client and the server. The Azure SDKs, in turn, wrap the HTTP communication into an easy-to-use set of client and model types.Įvery time you call a method on a Client class, an HTTP request is sent to the service. The majority of Azure services expose functionality over HTTP REST APIs. To build scalable applications it’s important to understand how your downstream dependencies scale and what limitations you can hit.

Parallels client connection