Tactical fix for specialization issue #2392

Author: mathewc

src/WebJobs.Script.WebHost/App_Start/WebHostResolver.cs

@@ -267,6 +267,13 @@ private TInstance GetActiveInstance<TInstance>(WebHostSettings settings, ref TIn
 
         private void OnSpecializationTimerTick(object state)
         {
+            if (_settingsManager.IsZipDeployment)
+            {
+                // TEMP - when in Zip deploy mode, temporarily disabling timer based specialization
+                // until issue https://github.com/Azure/azure-functions-host/issues/2392 is fixed.
+                return;
+            }
+
             EnsureInitialized((WebHostSettings)state);
 
             // We know we've just specialized, since this timer only runs

src/WebJobs.Script/Config/ScriptSettingsManager.cs

@@ -26,6 +26,8 @@ public static ScriptSettingsManager Instance
 
         public bool IsRemoteDebuggingEnabled => !string.IsNullOrEmpty(GetSetting(EnvironmentSettingNames.RemoteDebuggingPort));
 
+        public virtual bool IsZipDeployment => !string.IsNullOrEmpty(GetSetting(EnvironmentSettingNames.AzureWebsiteZipDeployment));
+
         public bool IsDynamicSku => GetSetting(EnvironmentSettingNames.AzureWebsiteSku) == ScriptConstants.DynamicSku;
 
         public virtual string AzureWebsiteDefaultSubdomain

src/WebJobs.Script/EnvironmentSettingNames.cs

@@ -11,6 +11,7 @@ public static class EnvironmentSettingNames
         public const string AzureWebsiteOwnerName = "WEBSITE_OWNER_NAME";
         public const string AzureWebsiteInstanceId = "WEBSITE_INSTANCE_ID";
         public const string AzureWebsiteSku = "WEBSITE_SKU";
+        public const string AzureWebsiteZipDeployment = "WEBSITE_USE_ZIP";
         public const string RemoteDebuggingPort = "REMOTEDEBUGGINGPORT";
         public const string AzureWebsitePlaceholderMode = "WEBSITE_PLACEHOLDER_MODE";
         public const string AzureWebsiteHomePath = "HOME";