Update MaxQueuePollingInterval default for Flex Consumption apps

release_notes.md

@@ -20,6 +20,8 @@
 
 ### New Features
 
+- Update MaxQueuePollingInterval default for Flex Consumption apps #2953
+
 ### Bug Fixes
 
 ### Breaking Changes

src/WebJobs.Extensions.DurableTask/Options/AzureStorageOptions.cs

@@ -18,6 +18,7 @@ public class AzureStorageOptions
         private const int MaxTaskHubNameSize = 45;
         private const int MinTaskHubNameSize = 3;
         private const string TaskHubPadding = "Hub";
+        private TimeSpan maxQueuePollingInterval;
 
         /// <summary>
         /// Gets or sets the name of the Azure Storage connection information used to manage the underlying Azure Storage resources.
@@ -160,9 +161,36 @@ public string TrackingStoreConnectionStringName
 
         /// <summary>
         /// Gets or sets the maximum queue polling interval.
+        /// We update the default value to 1 second for the Flex Consumption SKU
+        /// because of a known cold start latency with Flex Consumption
+        /// and Durable Functions.
+        /// The default value is 30 seconds for all other SKUs.
         /// </summary>
         /// <value>Maximum interval for polling control and work-item queues.</value>
-        public TimeSpan MaxQueuePollingInterval { get; set; } = TimeSpan.FromSeconds(30);
+        public TimeSpan MaxQueuePollingInterval
+        {
+            get
+            {
+                if (this.maxQueuePollingInterval == TimeSpan.Zero)
+                {
+                    if (string.Equals(Environment.GetEnvironmentVariable("WEBSITE_SKU"), "FlexConsumption", StringComparison.OrdinalIgnoreCase))
+                    {
+                        this.maxQueuePollingInterval = TimeSpan.FromSeconds(1);
+                    }
+                    else
+                    {
+                        this.maxQueuePollingInterval = TimeSpan.FromSeconds(30);
+                    }
+                }
+
+                return this.maxQueuePollingInterval;
+            }
+
+            set
+            {
+                this.maxQueuePollingInterval = value;
+            }
+        }
 
         /// <summary>
         /// Determines whether or not to use the old partition management strategy, or the new

test/FunctionsV2/AzureStorageOptionsTests.cs

@@ -0,0 +1,59 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the MIT License. See LICENSE in the project root for license information.
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Xunit;
+
+namespace Microsoft.Azure.WebJobs.Extensions.DurableTask.Tests
+{
+    public class AzureStorageOptionsTests
+    {
+#if !FUNCTIONS_V1
+        [Fact]
+        [Trait("Category", PlatformSpecificHelpers.TestCategory)]
+        public void MaxQueuePollingInterval_NonFlexConsumption_DefaultValue()
+        {
+            Environment.SetEnvironmentVariable("WEBSITE_SKU", "Free");
+
+            var options = new AzureStorageOptions();
+            Assert.Equal(TimeSpan.FromSeconds(30), options.MaxQueuePollingInterval);
+        }
+
+        [Fact]
+        [Trait("Category", PlatformSpecificHelpers.TestCategory)]
+        public void MaxQueuePollingInterval_NonFlexConsumption_SetCustomValue()
+        {
+            Environment.SetEnvironmentVariable("WEBSITE_SKU", "Free");
+
+            var options = new AzureStorageOptions();
+            options.MaxQueuePollingInterval = TimeSpan.FromSeconds(4);
+            Assert.Equal(TimeSpan.FromSeconds(4), options.MaxQueuePollingInterval);
+        }
+
+        [Fact]
+        [Trait("Category", PlatformSpecificHelpers.TestCategory)]
+        public void MaxQueuePollingInterval_FlexConsumption_DefaultValue()
+        {
+            Environment.SetEnvironmentVariable("WEBSITE_SKU", "FlexConsumption");
+
+            var options = new AzureStorageOptions();
+            Assert.Equal(TimeSpan.FromSeconds(1), options.MaxQueuePollingInterval);
+        }
+
+        [Fact]
+        [Trait("Category", PlatformSpecificHelpers.TestCategory)]
+        public void MaxQueuePollingInterval_FlexConsumption_SetCustomValue()
+        {
+            Environment.SetEnvironmentVariable("WEBSITE_SKU", "FlexConsumption");
+
+            var options = new AzureStorageOptions();
+            options.MaxQueuePollingInterval = TimeSpan.FromSeconds(6);
+            Assert.Equal(TimeSpan.FromSeconds(6), options.MaxQueuePollingInterval);
+        }
+#endif
+    }
+}