Wars of MySQL Cluster ( InnoDB Cluster VS Galera )
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MySQL Clustering over InnoDB engines has grown a lot over the last decade. Galera began working with InnoDB early and then Group Replication came to the environment later, where the features are now rich and robust. This presentation offers a technical comparison of both of them.
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Wars of MySQL Cluster ( InnoDB Cluster VS Galera )
- 1. Wars of MySQL Clusters (Galera Vs Group Replication) Karthik P R CEO, Mydbops January 30, 2021 Mydbops Database Meetup -8
- 2. Interested in Open Source Database technologies 11 Years of Experience with MySQL Ex-Yahoo! Tech Speaker/ Blogger CEO Mydbops Karthik P R About Me
- 3. Database Consulting Services Managed Database Services Focuses on Top Opensource database MySQL,MariaDB, MongoDB and PostgreSQL ON Premises and Cloud Mydbops Services
- 4. Replication in MySQL Synchronous Replication Solutions History of Synchronous Replication Galera Vs Group Replication Features comparison Agenda
- 6. Replication in MySQL Replication Synchronous Replication Asynchronous Replication Semi Synchronous Replication
- 7. Replication in MySQL Replication ( redundancy ) is a common solution for High Availability Asynchronous Replication Native replication ( data lag ) Logical Replication ( Binlog based ) Various architecture is Possible Filtering in Replication Engine Independent
- 8. Replication in MySQL Synchronous Replication Zero replication lag 2 Phase commit Based on Replication Database State Machine Theory Automated Primary Promotion Replication is Synchronous Applying is Asynchronous
- 10. Synchronous Replication Solutions Synchronous Replication Solutions Galera Group Replication
- 11. Synchronous Replication Solutions in MySQL Synchronous Replication Galera ( Codership ) Plugin with MySQL Percona XtraDB Cluster MariaDB Cluster Group Replication ( MySQL Native )
- 13. Codership Pioneered the Synchronous replication for MySQL. Codership released the first version of Galera in May 2007 Percona XtraDB Cluster First release Apr 2012 MariaDB Cluster First release Feb 2014 MySQL Group Replication Dec 2016 ( 5.7.17 ) History of Synchronous Replication
- 14. Galera Vs Group Replication
- 15. Supports only InnoDB Engine Parallel Replication Multi-master writes Paxos based Optimistic locking Network-based Cluster Galera & Group Replication
- 16. Feature Comparison GCS Protocol Flow Control Node Provisioning Large Transaction Support Consistency Levels Galera & Group Replication
- 17. Feature Comparison WriteSet Support WriteSet / Message Cache Arbitrator Support Native GTID Support Load Balancer Support Galera & Group Replication
- 18. GSC Protocol
- 19. Galera Based Solution Totem Single Ring ordering Group Replication Paxos based. eXtended COMmunication ( XCOM ) GCS Protocol
- 20. Flow Control
- 21. gcs.fc_limit ,gcs.fc_master_slave, gcs.fc_factor group_replication_flow_control_mode Galera Based Solution Flow Control stops the writes when triggered. Group Replication Each node can throttle writes when triggered Collect stats from every node Flow Control
- 23. Galera Based Solution IST ( Incremental snapshot transfer ) Incremental state transfer using gcache SST ( state snapshot transfer ) mysqldump rsync xtrabackup-v2 ( Hot method ) Mariabackup ( Hot method in MariaDB Cluster ) Node Provisioning
- 24. group_replication_clone_threshold auto-provision based on transaction gap. Group Replication Based Solution Message cache ( Incremental data ) Async Replication Clone Plugin - 8.0.17 ( 22-07-2019 ) Node Provisioning
- 25. Additional Information https://galeracluster.com/2021/01/galera-cluster-for-mysql-5-6-50-5-7-32-and-8-0-22-released/ Clone Plugin is supported Galera SST from 8.0.22 ( 14 Jan 2021 ) Not available in PXC or MariaDB Cluster yet Node Provisioning
- 27. Galera Based Solution Streaming Replication Galera 4 ( PXC 8.0 and MariaDB 10.4 & above ) wsrep_trx_fragment_size wsrep_trx_fragment_units Large Transaction Support
- 28. The default is 10MB messages above it are fragmented ( chunked ) and broadcasted. Group Replication Huge transaction are supported from 8.0.16 ( 2019-04-25) group_replication_communication_max_message_size Large Transaction Support
- 30. Galera/PXC The causality check is enabled by "wsrep_sync_wait" It has multiple levels (0,1,2,3,4,8 ) Consistency Levels
- 31. Group Replication The consistency check is controlled by "group_replication_consistency" It is available from 8.0.14 ( 2019-01-21 ) Modes EVENTUAL BEFORE AFTER BEFORE AND AFTER BEFORE_ON_PRIMARY_FAILOVER Consistency Levels
- 32. WriteSet Support
- 33. Galera Based Solution Galera uses writeset from the initial release with its own GTID The Parallel replication is enhanced with writeset. Group Replication Writeset is introduced on MySQL 8.0 Binlog based transaction extraction applier Writeset & Writest session ( logical_clock replication ) Writeset Support
- 35. Galera Based Solution Galera uses writeset cache or Gcache for IST and local recovery. wsrep_provider_option="gcache.size=128M" Group Replication It uses message cache size ( From 8.0.16 ) ( 2019-04-25) Group_replication_message_cache-size ( 128 MB ) 8.0.21 Writeset Cache Support
- 37. * Not a big deal if storage is not a big deal. Galera Based Solution Galera Provides Arbitrartor Support Group Replication Group Replication does not provide Arbitrator Support Arbitrator Support
- 39. Galera Based Solution Generates its own GTID in 5.5, 5.6, 5.7 versions Galera started to support native MySQL GTID from MySQL 8.0. Group Replication Group Replication is built on top of GTID Native GTID Support
- 41. Galera Based Solution Galera has support for Maxscale and ProxySQL ( inbuilt ) Percona XtraDB Cluster has inbuilt support for ProxySQL ProxySQL check can be made better with external scripts Group Replication Group Replication has support for MySQL Router and ProxySQL PrxoySQL is most recommended. Load Balancer Support
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