![]() ![]() There is nothing here preventing data from being indexed though. With that all in place, it means that no data will ever be looked up to rebuild indexes and Umbraco will not send data to be indexed. Public void Compose(Composition composition)Ĭomposition.Register(Lifetime.Singleton) Lastly, we just need to enable these services: public class DisabledExamineComposer : IUserComposer Protected override void PopulateIndexes(IReadOnlyList indexes) Public override bool IsRegistered(IUmbracoMemberIndex index) => false Public override bool IsRegistered(IIndex index) => false public class DisabledMemberIndexPopulator : MemberIndexPopulator All these do is ensure they are not associated with any index and then just to be sure, does not execute any logic for population. The next thing to do is to create no-op index populators to replace the Umbraco default ones. Private readonly string _lockId = Guid.NewGuid().ToString() Private class RandomIdRamDirectory : RAMDirectory required so that each ram dir has a different ID UmbracoIndexConfig.GetMemberValueSetValidator()) UmbracoIndexConfig.GetPublishedContentValueSetValidator())Ĭ, UmbracoIndexConfig.GetContentValueSetValidator())Ĭ, New CultureInvariantWhitespaceAnalyzer(), New RandomIdRamDirectory(), // in-memory dir we are using an in-memory Lucene directory.Ĭ, all of the below is the same as Umbraco defaults, except : base(profilingLogger, languageService, publicAccessService, memberService, umbracoIndexConfig) IPublicAccessService publicAccessService, public class InMemoryExamineIndexFactory : UmbracoIndexesCreator ![]() This means Umbraco will not try to update the index based on content, media or member changes. ![]() This new one will change the underlying Lucene directory for each index to be a RAMDirectory and will also disable the default Umbraco event handling that populates the indexes. Show me the codeįirst thing is to replace the default index factory. Then disable the queries that execute when Umbraco tries to re-populate the indexes. To do that, you would change the default Umbraco indexes to use an in-memory only store and prohibit data from being put into the indexes. If you don't use Examine APIs on your front-ends then it is a reasonable solution to disable Examine/Lucene on the front-ends to avoid this issue. If you use Examine APIs on your front-end, then you cannot just disable Examine/Lucene so the only reasonable solution is to use an Examine implementation that uses a hosted search service like ExamineX An important thing to realize is that these rebuild queries will occur for all new workers, so if you scaled out from 1 to 10, that is 9 new workers coming online at the same time. This can end up with SQL Lock timeout issues. Why? Because Umbraco v8 uses distributed SQL locks to ensure data integrity and during these queries a content lock will be created which means other back office operations on content will need to wait. When indexes are rebuilt, the worker will query the database for the data and depending on how much data you have in your Umbraco installation, this could take a few minutes which can be problematic. This will occur when Azure moves a site or when a new worker comes online from a scale out action. When a site is moved or provisioned on a new worker the local %temp% location will be empty so Lucene indexes will be rebuilt on startup for that worker. Using the TempEnvDirectoryFactory means that the indexes will only be stored on the worker's local 'fast drive' which is in it's %temp% folder on the local (non-network share) hard disk. Without this setting (or with the SyncTempEnvDirectoryFactory setting) it would mean that each worker will be trying to write Lucene file based indexes to the same location which will result in corrupt indexes and locked files. This is because each scaled out worker is running from the same network share file system. In this case, you need to have the Examine configuration option of: If you are running a Load Balancing setup in Azure App Service then you have the option to scale out (and perhaps you do!). I recently had a request to know if it’s possible to disable Examine/Lucene for front-end servers since they didn’t use Examine/Lucene APIs at all on their front-end pages… here’s the answer Why would you want this? ![]() In Umbraco v8, Examine and Lucene are only used for the back office searches, unless you specifically use those APIs for your front-end pages. ![]()
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