Cosmos DB：请求失败，因为客户端无法跨1个区域建立到1个endpoint的连接

Question

下面异常记录在应用程序洞察HTTP触发器Azure函数中。

请求失败，因为客户端无法跨%1个区域建立到%1个endpoint的连接。在尝试请求期间客户端CPU过载

Azure功能：

public static class RetrieveNotifications
    {
        [FunctionName(nameof(RetrieveNotifications))]
        public static async Task<IActionResult> Run(
            [HttpTrigger(AuthorizationLevel.Function, "post", Route = null)] HttpRequest req,
            [Inject] ILoggingService loggingService,
            [Inject] IQueryValidator queryValidator,
            [Inject] IQueryHandler<RetrieveNotificationQuery, NotificationSummaryResponse> queryHandler)
        {
            var logger = new Logger(loggingService);

            try
            {
                logger.Info($"Retrieve Notifications request received on {nameof(RetrieveNotifications)}");

                IActionResult actionResult = null;

                string requestBody = await new StreamReader(req.Body).ReadToEndAsync();

                var query = requestBody.AsPoco<RetrieveNotificationQuery>();

                if (queryValidator.Validate<RetrieveNotificationQuery>(req, query, new RetrieveNotificationQueryValidator(), logger, ref actionResult))
                {
                    var response = await queryHandler.HandleAsync(query, logger);
                    actionResult = new OkObjectResult(response);
                }
                return actionResult;
            }
            catch (Exception ex)
            {
                logger.Error($"Exception while processing {nameof(RetrieveNotifications)}", ex,
                nameof(RetrieveNotifications));

                throw;
            }
        }
    }

Answer 1

您的异常包含连通性问题的根源：

The client CPU was overloaded during the attempted request

这意味着CPU不足，无法在预期的超时间隔内处理TCP请求。其原因在官方文档中:https://docs.microsoft.com/azure/cosmos-db/troleshoot-dot-net-sdk-request-timeout#high-cpu-ustrility

检查实例度量，看看是否需要扩展实例的大小来处理正在执行的操作负载。我看到您正在向函数中注入引用，我猜这些是CosmosClient的单例实例（如果不是，它们应该是）。