(Re)Indexing Large Repositories in Alfresco
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Alfresco TTL (Re)Indexing Large Repositories Angel Borroy & To Page
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(Re)Indexing Large Repositories in Alfresco
- 1. Angel Borroy Tom Page 10th June 2020 (Re)Indexing Large Repositories
- 2. 22 Agenda (Re)Indexing Large Repositories • Alfresco SOLR in a Nutshell • Indexing Process • Indexing Scenarios • When to Re-Index • Deployment Alternatives • Demo time without downtime! • Benchmark Review • Improvements in 1.4.2 • Future Improvements • Recap Alfresco SOLR
- 3. 3 Alfresco SOLR in a Nutshell SOLR 6 is used in Alfresco to perform two main processes: • Indexing (or tracking) metadata, permissions and content from Alfresco Repository • Returning results from search queries supporting several syntaxes (AFTS, CMIS) Indexing process Asynchronous
- 4. 4 Searching process Eventual consistency SOLR is indexing the information after the database has committed the transaction, so there is a short period of time when not all the documents are available in SOLR Index. We call this eventual consistency, as SOLR will catch up with Repository eventually. Syntax AFTS CMIS Alfresco SOLR in a Nutshell Permission Checks Synchronous
- 5. 5 Alfresco SOLR in a Nutshell Alfresco SOLR Storage By default two SOLR cores are created, one for the living documents (alfresco) and one for the removed documents (archive). Each core includes following storage folders: • Default SOLR Index files in the solrhome/<core>/index folder • Alfresco customized Content Store in the contentstore folder • This folder includes a cached copy of Repository content and metadata • Content Store will be removed in Search Services 2.0 “These folders are populated by the Indexing Process
- 6. 6 Indexing process ● Each tracker is fired asynchronously according to a cron expression: alfresco.cron or alfresco.*.tracker.cron ● Transactions and ACL Change Sets are processed in batches of Nodes or ACLs ● Batches are split to be executed in parallel by Workers ● However, Content Tracker recovers text from content nodes one by one ● Commit Tracker writes the changes from the different Trackers to SOLR Index "eventually" >> Cascade Tracker is not running when indexing from scratch
- 7. 7 Indexing scenarios 1. When updating the repository using applications or bulk ingestion processes, the transactions will include a long list of nodes to be indexed 2. When using Alfresco Share to create new content, there will be more transactions but every transaction will include a small list of nodes to be indexed 3. When setting the permission level for every node in a hierarchy manually, the ACL Change Sets will include a long list of ACLs to be indexed 4. When using default Alfresco permissions design, the ACL Change Sets will include a small list of ACLs to be indexed 5. When using complex format of documents, Transformation Service will require additional resources 6. When using large documents, SOLR Index will require additional storage
- 8. 8 Indexing scenarios Controlling what to index • Content can be excluded from SOLR Index by configuration solrcore.properties > alfresco.index.transformContent=false https://docs.alfresco.com/search-community/concepts/solrcore-properties-file.html • Some nodes can be excluded from SOLR Index by using the Index Control aspect cm:indexControl > cm:isIndexed :: false, metadata and content is not indexed cm:indexControl > cm:isContentIndexed :: false, content is not indexed https://docs.alfresco.com/community/concepts/admin-indexes.html • Some properties can be excluded from SOLR Index by design in the Content Model <property> <index enabled=”false”/> </property> https://docs.alfresco.com/community/references/dev-extension-points-content-model-define-and-deploy.html Add this setting to archive core by default!
- 9. 9 Re-indexing process can take some time, from a few hours to a few days, in large repositories. Full re-index • When upgrading to a major Search Services release, like 2.0 • When the SOLR Index has been corrupted, due to technical reasons • When breaking changes are introduced in common custom Content Models Partial re-index • This process could also take some time, depending on the amount of documents to be re-indexed. But it will take less than a full re-index • When incremental changes are introduced in a Content Model, partial reindexation can be fired by using the SOLR REST API http://localhost:8983/solr/admin/cores?action=reindex&query=TYPE:person When to re-index
- 11. 11 • Using the ZIP Distribution file https://docs.alfresco.com/search-community/concepts/solr-install-config.html • Using Docker or Docker Compose https://github.com/Alfresco/SearchServices/tree/master/search-services https://github.com/Alfresco/acs-community-deployment/tree/master/docker-compose https://github.com/Alfresco/alfresco-docker-installer • Using Kubernetes https://github.com/Alfresco/acs-community-deployment/tree/master/helm/alfresco-content-services-community Installing alternatives
- 12. 12 Deployment schema to minimize downtime in re-indexing processes > When using different SOLR version, configure Alfresco Repository to use the new SOLR server * > When using the same SOLR version, INDEX folder can be used directly * Upgrading from SOLR 4 to SOLR 6 is not allowed when using Alfresco CE 6.2.0-ga (thanks for raising this @AFaust) >> SEARCH-2289 Deployment for Re-Indexing
- 13. 13 When configuring an Alfresco Node to perform the reindexing process, there are some services you can switch off depending on your requirements: • Scheduled Jobs can be disabled, as they will be run by the Alfresco instance in the living service https://docs.alfresco.com/6.2/concepts/scheduled-jobs.html • Some ACS features can be disabled https://docs.alfresco.com/6.2/concepts/maincomponents-disable.html • Additional subsystems (apart from Search or Transformation) can be disabled https://docs.alfresco.com/6.2/concepts/subsystem-categories.html • Activities • Audit • Email • … “Don’t make a copy of your Alfresco Repository production configuration and press the start button! Alfresco Repository Indexing Configuration
- 14. 14 Monitoring Profiling • Using VisualVM or YourKit Java Profiler for the JVMs (Repository, SOLR) • Using pg_stats_statements extension or some other DB tool https://hub.alfresco.com/t5/alfresco-content-services-blog/alfresco-6- profiling-with-docker/ba-p/295846 https://github.com/aborroy/alfresco-6-profiling Monitoring • Using Prometheus with Grafana (Repository, SOLR) https://hub.alfresco.com/t5/alfresco-content-services-blog/monitoring- alfresco-solr-with-prometheus-and-grafana/ba-p/294157 https://github.com/aborroy/alfresco-solr-monitoring
- 15. 1515 Demo time without downtime!
- 16. 16 • Living Docker Compose environment running with around 4,000 text documents indexed • Using YourKit-Java-Profiler to monitor Repository performance • Starting a new Search Services 2.0 server locally to start indexing the repository • Once Search Services 2.0 is updated, change Solr hostname value from Admin Web Console or modify alfresco-global.properties Search Services 2.0 is not released yet! Demo time without downtime! http://127.0.0.1:8083/solr/alfresco/select?indent=on&q=TEXT:[* TO *]&wt=json http://127.0.0.1:8983/solr/alfresco/select?indent=on&q=TEXT:[* TO *]&wt=json
- 18. 18 1 Billion Documents Review (2015) • Review from 1 billion benchmarks (November 2015) • 10 repository nodes (Alfresco 5.1), 20 Solr 4 nodes (Alfresco Index Server) • Indexed 1b documents in 5 days How Alfresco powered a 1.2 Billion document deployment on Amazon Web Services
- 20. 20 1.2 Billion Baseline Plan (2020) • Customer-sponsored benchmark to see performance of system with their configuration • Want 1.2b documents indexed into Search Services • 20 instances, each containing a single shard (DB_ID_RANGE based sharding)
- 21. 21 • Bottlenecks • Database (getChildAssocs) • Transformers (when using large documents) • Network (when using large metadata/content) • Time spent processing data for other shards Performance considerations
- 22. 22 Baseline Results • Estimated completion in 21 days
- 23. 23 Baseline Results • Estimated completion in 21 days
- 24. 24 DB_ID_RANGE Sharding • Does not require specifying total number of shards in advance • Index can continue to grow with repository See https://docs.alfresco.com/search-enterprise/concepts/solr-shard-approaches.html
- 27. 27 Time spend processing transactions for other shards • With DB_ID_RANGE sharding we know that only a range of transactions are relevant • Skip transactions when using DB_ID_RANGE • To support path queries we sometimes need to update data on multiple shards from a single change • Option to disable cascade tracking
- 28. 28 Reduce Database Access and Network Usage • Reduce amount of data requested • Remove unused calls to getChildAssocs • Compress communication where appropriate • Add option to compress content transfer Lorem ipsum dolor sit amet, consectetur adipiscing elit... Please give me all metadata for the node Please give me: ● X ● Y ● Z 78 9c 05 c1 81 09 c0 30 08 04 c0 ...
- 29. 29 Overview of Improvements in 1.4.2 • Search Services 1.4.2 (and Insight Engine 1.4.2) • ACS Repository 6.2 Enterprise • No ACS Community release containing this yet • However can use existing ACS and jars from https://github.com/aborroy/solr-performance-services-repo Reindex of 1.2b documents in 10 days (6 repo nodes, 20 search nodes) Search Services 1.3.0 150 documents/second Search Services 1.4.2 1200-3500 documents/second* (depending on the number of shards, size of documents, etc.) * Depending on exact configuration (Nb. Not yet validated on the production system)
- 31. 31 Future Improvements - Coming in 2.0.0 • Schema Simplification • Smaller index • Removing Duplicate Fields • Smaller communication • Improved Trackers • Less duplication with large transactions • New tracker parallelism option • Content Store Removal • Reduced disk usage • Less duplication • Better usage of Solr optimisations • Adds potential to use other Solr features
- 32. 32 Scenarios datasets • 100,000 documents created with 100,000 transactions • 100,000 documents created with 1 transaction • Changing the path for 100,000 documents • 200,000 ACLs created with 200,000 ACL change sets Parameters investigated • The existing *BatchSize size parameters • The new *MaxParallelism parameters • These change the number of workers assigned to the tracker. They use a ForkJoinPool, and can impact the resources available to other processes Improved Trackers - Testing
- 33. 33 Hotspot calculation • Increasing the Transaction Batch Size for nodes and ACLs has an impact while the maximum number for your deployment is not reached. After that, you can increase this batch size but there will be no performance changes • Increasing the Node Batch Size can improve your performance while you are down the right number for your deployment. After that, you can increase this batch size but the performance will be penalised • Increasing the maximum number of Parallel Threads improved performance until the maximum number for our deployment was reached. However in a real world deployment it may be useful to use a lower number to avoid impacting other processes. Improved Trackers - Testing Duration (ms) #
- 34. 34 Content Store Removal • Solr Content store removal will reduce disk usage and simplify replication The Solr Content Store
- 35. 35 Content Store Removal • Solr Content store removal will reduce disk usage and simplify replication The Solr Content Store Replication of index across Solr nodes
- 36. 3636 Recap
- 37. 37 When to re-index • When upgrading to major Search Services releases How to re-index • Running some small tests to ensure the performance of the indexing process before running it in production • Indexing from scratch with the upgraded Repository • Indexing in a parallel deployment How to measure • Profiling • Monitoring Recap
- 38. Thank you!