Cosmos DB 更改源觸發 Azure 功能：租賃丟失異常

Question

以下異常記錄在 Cosmos DB 更改提要觸發 azure 函數的應用程序洞察中：

Microsoft.Azure.Documents.ChangeFeedProcessor.Exceptions.LeaseLostException

[{"severityLevel":"Error","outerId":"0","message":"租約丟失。","parsedStack":[{"assembly":"Microsoft.Azure.Documents.ChangeFeedProcessor, Version =2.2.6.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35","method":"Microsoft.Azure.Documents.ChangeFeedProcessor.LeaseManagement.DocumentServiceLeaseStoreManager+d__16.MoveNext","level":0,"line":0},{ "assembly":"System.Private.CoreLib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e","method":"System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw","level":1,"line ":0},{"assembly":"System.Private.CoreLib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e","method":"System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess","level ":2,"line":0},{"assembly":"System.Private.CoreLib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e","method":"System.Runtime.CompilerServices.TaskAwaiter .HandleNonSuccessAndDebuggerNotification","level":3,"line":0},{"assembly":"Microsoft.Azure.Doc uments.ChangeFeedProcessor, Version=2.2.6.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35","method":"Microsoft.Azure.Documents.ChangeFeedProcessor.PartitionManagement.PartitionController+d__9.MoveNext","level":4,"line" :0},{"assembly":"System.Private.CoreLib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e","method":"System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw","level" :5,"line":0},{"assembly":"System.Private.CoreLib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e","method":"System.Runtime.CompilerServices.TaskAwaiter。 ThrowForNonSuccess","level":6,"line":0},{"assembly":"System.Private.CoreLib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e","method":"System. Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification","level":7,"line":0},{"assembly":"Microsoft.Azure.Documents.ChangeFeedProcessor, Version=2.2.6.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" ,"method":"Microsoft.Azure.Document s.ChangeFeedProcessor.HealthMonitoringPartitionControllerDecorator+d__3.MoveNext","level":8,"line":0}],"type":"Microsoft.Azure.Documents.ChangeFeedProcessor.Exceptions.LeaseLostException","id":"517071" }

Cosmos DB 更改源觸發器 Azure 功能：

public static class NotificationChangeFeed
    {
        [FunctionName(nameof(NotificationChangeFeed))]
        public static async Task Run([CosmosDBTrigger(
            databaseName: CosmosDBConstants.DataBaseName,
            collectionName: CosmosDBConstants.NotificationContainer,
            ConnectionStringSetting = CosmosDBConstants.ConnectionStringName,
            CreateLeaseCollectionIfNotExists = true,
            LeaseCollectionName = CosmosDBConstants.LeaseConainer)]IReadOnlyList<Document> input,
            [Inject] ILoggingService loggingService,
            [Inject] IEmailProcessor emailProcessor)
        {
            var logger = new Logger(loggingService);

            try
            {
                if (input != null && input.Count > 0)
                {
                    foreach (Document document in input)
                    {
                        string requestBody = document.ToString();
                        var notification = requestBody.AsPoco<Notification>();

                        await emailProcessor.HandleEmailAsync(notification, logger);
                        logger.Info($"Email Notification sent successfully for file name: {document.Id}");
                    }
                }
            }
            catch (Exception ex)
            {
                logger.Error($"Unable to process Documents for Email Notification for Files: {input?.Count}", ex,
                    nameof(NotificationChangeFeed));
                throw;
            }
        }
    }

Answer 1

此錯誤意味着lease is lost, that would typically happen when it is taken by another host. Other cases: communication failure, number of retries reached, lease not found. lease is lost, that would typically happen when it is taken by another host. Other cases: communication failure, number of retries reached, lease not found.

• 處理租約的首選方法是使用自動租約Checkpoint實現（如果您使用的是manual checkpointing ）。
• 您還可以檢查 Lease 收集是否存在。

Answer 2

LeaseLost 是一個正常信號，表示當前實例擁有租約，但由於負載平衡（可能是另一個實例出現或實例數量發生變化），它被另一台主機占用。 這是在初始化期間（第一次啟動一組實例）或由於實例數量變化而重新平衡期間的預期。

用戶不需要做什么，因為這是正常生命周期的一部分。 租用現在由另一個實例處理，該實例將讀取租用范圍內的分區中發生的更改。