[Cosmos DB] Release 4.5.0

build/common.props

@@ -3,7 +3,7 @@
     <!-- Extensions can have independent versions and only increment when released -->
     <Version>3.0.0$(VersionSuffix)</Version>
     <ExtensionsVersion>5.0.0$(VersionSuffix)</ExtensionsVersion> <!-- WebJobs.Extensions -->
-    <CosmosDBVersion>4.4.2$(VersionSuffix)</CosmosDBVersion>
+    <CosmosDBVersion>4.5.0$(VersionSuffix)</CosmosDBVersion>
     <HttpVersion>3.2.0$(VersionSuffix)</HttpVersion>
     <MobileAppsVersion>3.0.0$(VersionSuffix)</MobileAppsVersion>
     <SendGridVersion>3.0.3$(VersionSuffix)</SendGridVersion>

src/WebJobs.Extensions.CosmosDB/Trigger/CosmosDBMetricsProvider.cs

@@ -61,6 +61,14 @@ public async Task<CosmosDBTriggerMetrics> GetMetricsAsync()
                 partitionCount = partitionWorkList.Count;
                 remainingWork = partitionWorkList.Sum(item => item.EstimatedLag);
             }
+            catch (CosmosException cosmosException) when (cosmosException.StatusCode == HttpStatusCode.Gone)
+            {
+                // Temporary handling of split issue described in https://github.com/Azure/azure-cosmos-dotnet-v3/issues/4285
+                // This happens if the main instance is not running, potentially using Consumption Plan
+                // In this case, we return a positive value to make the Scale Controller consider spinning at least a single instance
+                partitionCount = 1;
+                remainingWork = 1;
+            }
             catch (Exception e) when (e is CosmosException || e is InvalidOperationException)
             {
                 if (!TryHandleCosmosException(e))

src/WebJobs.Extensions.CosmosDB/WebJobs.Extensions.CosmosDB.csproj

@@ -19,7 +19,7 @@
     <WarningsAsErrors />
   </PropertyGroup>
   <ItemGroup>
-    <PackageReference Include="Microsoft.Azure.Cosmos" Version="3.35.4" />
+    <PackageReference Include="Microsoft.Azure.Cosmos" Version="3.38.1" />
     <PackageReference Include="Microsoft.Azure.WebJobs" Version="3.0.37" />
     <PackageReference Include="Microsoft.CSharp" Version="4.5.0" />
     <PackageReference Include="Microsoft.Extensions.Azure" Version="1.1.0" />

test/WebJobs.Extensions.CosmosDB.Tests/Trigger/CosmosDBMetricsProviderTests.cs

@@ -163,5 +163,24 @@ public async Task GetMetrics_HandlesExceptions()
             warning = _loggerProvider.GetAllLogMessages().Single(p => p.Level == Microsoft.Extensions.Logging.LogLevel.Warning);
             Assert.Equal("CosmosDBTrigger Exception message: Uh oh again.", warning.FormattedMessage);
         }
+
+        [Fact]
+        public async Task GetMetrics_HandleSplit()
+        {
+            _estimatorIterator
+                .SetupSequence(m => m.HasMoreResults)
+                .Returns(true)
+                .Returns(false);
+
+            _estimatorIterator
+                .Setup(m => m.ReadNextAsync(It.IsAny<CancellationToken>()))
+                .ThrowsAsync(new CosmosException("Partition is gone", HttpStatusCode.Gone, 1002, string.Empty, 0));
+
+            var metrics = await _cosmosDbMetricsProvider.GetMetricsAsync();
+
+            Assert.Equal(1, metrics.PartitionCount);
+            Assert.Equal(1, metrics.RemainingWork);
+            Assert.NotEqual(default(DateTime), metrics.Timestamp);
+        }
     }
 }