High Availability with Galera Cluster - SkySQL Road Show 2013 in Berlin
•
1 gefällt mir•2,177 views
High Availability with Galera Cluster by Seppo Jaakkola, Codership at the SkySQL Road Show 2013 in Berlin 18.6.2013
Empfohlen
Empfohlen
Weitere ähnliche Inhalte
Was ist angesagt?
Was ist angesagt? (20)
Ähnlich wie High Availability with Galera Cluster - SkySQL Road Show 2013 in Berlin
Ähnlich wie High Availability with Galera Cluster - SkySQL Road Show 2013 in Berlin (20)
Mehr von MariaDB Corporation
Mehr von MariaDB Corporation (20)
Kürzlich hochgeladen
Kürzlich hochgeladen (20)
High Availability with Galera Cluster - SkySQL Road Show 2013 in Berlin
- 1. G a l e r a C l u s t e r Seppo Jaakola Codership
- 2. 2 www.codership.com Agenda ● The Meaning of Galera ● Galera Cluster Short Introduction ● Migrating to Galera Cluster ● Galera Project ● MariaDB Galera Cluster 5.5.29 GA
- 3. 3 www.codership.com What is the Meaning of Galera ? Turns out it has different semantics in: ● Italy ● Uruguay ● Brazil ● Spain, Portugal, Russia...
- 4. 4 www.codership.com Galera in Italy Che cosa significa la parola galera?
- 5. 5 www.codership.com Galera in Italy Che cosa significa la parola galera? Jail / Prison
- 6. 6 www.codership.com Galera in Italy Che cosa significa la parola galera? Poliziotto Jail / Prison
- 8. 8 www.codership.com Galera in Uruguay Que significa galera en Uruguai?
- 9. 9 www.codership.com Galera in Uruguay Que significaca galera en Uruguai? Traditional tall hat
- 10. 10 www.codership.com Galera in Brazil Como sobre em Brazil?
- 11. 11 www.codership.com Galera in Brazil A Group of Happy People
- 12. 12 www.codership.com Galera in Spain, Portugal, Russia... Here's the correct meaning for Galera...
- 13. 13 www.codership.com Galera in Spain, Portugal, Russia... Galley
- 14. Galera Cluster
- 16. 16 www.codership.com MariaDB MariaDB Multi-Master Replication Galera Replication There can be several nodes
- 17. 17 www.codership.com MariaDB MariaDB MariaDB Multi-Master Replication Galera Replication There can be several nodes
- 18. 18 www.codership.com MariaDB MariaDB MariaDB Multi-Master Replication Galera Replication Client can connect to any node There can be several nodes
- 19. 19 www.codership.com MariaDB MariaDB MariaDB Multi-Master Replication Galera Replication Client can connect to any node There can be several nodes read & write read & write read & write Read & write access to any node
- 20. 20 www.codership.com MariaDB MariaDB MariaDB Multi-Master Replication Galera Replication Replication is synchronous read & write read & write read & write Client can connect to any node There can be several nodes Read & write access to any node
- 21. 21 www.codership.com MariaDB Multi-Master Replication a Multi-master cluster looks like one big database with multiple entry points read & write read & write read & write
- 22. 22 www.codership.com MariaDB MariaDB MariaDB Synchronous Replication a Galera Replication Read & write Transaction is processed locally up to commit time
- 23. 23 www.codership.com MariaDB MariaDB MariaDB Synchronous Replication Galera Replication commit Transaction's write set is replicated to whole cluster Slave queueSlave queue
- 24. 24 www.codership.com Galera Replication MariaDB MariaDB MariaDB Synchronous Replication OK Client gets OK status Slave queueSlave queue
- 25. 25 www.codership.com Galera Replication MariaDB MariaDB MariaDB Synchronous Replication Transaction is applied in slaves Slave queueSlave queue
- 26. 26 www.codership.com MariaDB MariaDB MariaDB How node failures are handled a Galera Replication Load Balancing
- 27. 27 www.codership.com MariaDB MariaDB MariaDB Quorum a Galera Replication Load Balancing ● Galera uses quorum based failure handling: – When cluster partitioning is detected, the majority partition "has quorum" and can continue – A minority partition cannot commit transactions, but will attempt to re-connect to primary partition – Note: 50% is not majority! => Minimum 3 nodes recommended. ● Load balancer will notice errors & remove node from pool
- 29. 29 www.codership.com Galera Replication A Optimistic Concurrency Control commit Trx A B commit Trx B
- 30. 30 www.codership.com Galera Replication A Optimistic Concurrency Control commit Trx A B commit Trx B DEADLOCK eror ROLLBACK
- 31. 31 www.codership.com Optimistic Concurrency Control ● Transactions process independently in each cluster node ● Transaction write sets will be replicated at commit time (before commit) ● Cluster wide conflicts will be resolved and conflict victim must rollback Optimistic Concurrency Control
- 32. 32 www.codership.com Multi-Master or Not ● If your application can handle deadlock errors, multi-master is good to use ● However, if database has hot-spots, i.e. multi-master conflicts happen frequently, write performance will suffer ● But read scalability is always guaranteed ● Use Master-Slave, if deadlock errors are a problem or conflict rate hurts your performance
- 34. 34 www.codership.com MariaDB Parallel Replication Slave queue Slave thd Slave thd Any number of slave applier threads can be started Slave control
- 35. 35 www.codership.com MariaDB Parallel Replication Slave queue Slave thd Slave thd Any number of slave applier threads can be started Slave control assigns write sets for slave appliers Slave control
- 36. 36 www.codership.com MariaDB Parallel Replication Slave queue Slave thd Slave thd Any number of slave applier threads can be started Slave control assigns write sets for slave appliers Slave control is on ROW levelSlave control
- 37. 38 www.codership.com MariaDB Parallel Replication Slave queue Slave thd Slave thd Slave control Any number of slave applier threads can be started Slave control assigns write sets for slave appliers Slave control is on ROW level Only applying is parallel commit order is dictated
- 38. 39 www.codership.com Parallel Applying ● Aka parallel replication ● Every application will benefit of it, because it works: ● not on database ● not on table ● but on row level ● wsrep_slave_threads=n ● How many slaves makes sense: ● Monitor wsrep_cert_deps_distance ● Max ~4 * #CPUcores
- 40. 41 www.codership.com Galera Cluster ➢ Good Performance ➢ Optimistic concurrency control ➢ Virtually synchronous replication ➢ Parallel Replication ➢ Optimized Group Communication ➢ 99.99% transparent ➢ InnoDB look & feel ➢ Automatic node joining ➢ Works in LAN / WAN / Cloud
- 41. 42 www.codership.com Galera Cluster ➢ Synchronous multi-master cluster ➢ no data loss ➢ no slave lag ➢ no slave failover ➢ For MySQL/MariaDB InnoDB ➢ 3 or more nodes needed for HA ➢ No single point of failure
- 42. 52 www.codership.com Synchronous Replication That's more like it !!
- 43. 53 www.codership.com Synchronous Replication That's more like it !! Row based
- 44. 54 www.codership.com Synchronous Replication That's more like it !! Multi-Master Row based
- 45. 55 www.codership.com Synchronous Replication That's more like it !! Multi-Master All have Oxford master degree Row based
- 46. 56 www.codership.com Synchronous Replication That's more like it !! Multi-Master All have Oxford master degree Synchronous Row based
- 47. 57 www.codership.com Synchronous Replication That's more like it !! Top notch performance Multi-Master All have Oxford master degree Synchronous Row based
- 48. 58 www.codership.com Synchronous Replication That's more like it !! Top notch performance Multi-Master All have Oxford master degree Arbitrator Synchronous Row based
- 50. 60 www.codership.com MySQL MySQL Automatic Node Joining Galera Replication joiner Cluster handshake
- 51. 61 www.codership.com MySQL Donor Automatic Node Joining Galera Replication joiner Send state
- 52. 62 www.codership.com MySQL MySQL Automatic Node Joining Galera Replication joiner Catch up Slave queue
- 53. 63 www.codership.com MySQL MySQL Automatic Node Joining Galera Replication MySQL
- 54. Migrating to Galera Cluster
- 55. 65 www.codership.com Migrating to Galera Clustering a MySQL slave MySQL master MySQL master slave hierarchy
- 56. 66 www.codership.com MySQL slave MySQL master Galera Node 1 Migrating to Galera Clustering a Install first Galera node to operate as MySQL slave
- 57. 67 www.codership.com MySQL slave MySQL master Galera Node 1 Migrating to Galera Clustering a promote Galera node to operate as one node cluster
- 58. 68 www.codership.com MySQL slave MySQL master Galera Node 1 Migrating to Galera Clustering a Join more nodes in Galera slave cluster Galera Node 2 Galera Node 3
- 59. 69 www.codership.com MySQL slave MySQL master Galera Node 1 Migrating to Galera Clustering a Move traffic to Galera cluster Galera Node 2 Galera Node 3
- 60. 70 www.codership.com Galera Node 1 Migrating to Galera Clustering a Drop obsolete MySQL servers Galera Node 2 Galera Node 3
- 61. Galera Project
- 62. 72 www.codership.com Galera Project ● Galera Cluster for MySQL ● 5 years development ● based on MySQL server community edition ● Fully open source ● Active community ● ~3 releases per year ● Latest release 2.3 ● Major release 3.0 in the works ● MariaDB Galera Cluster 5.5.29 GA !!
- 63. 73 Who is using Galera?
- 64. 74 www.codership.com Galera Project MySQL MariaDB merge merge MySQL Community Edition MariaDBGalera Cluster for MySQL MariaDB Features API MySQL Galera Replication plugin
- 65. 75 www.codership.com Galera Project API Galera Replication plugin API MariaDB MySQL Community Edition MariaDB Galera Cluster MySQL Galera Cluster for MySQL merge Galera Replication plugin MySQL
- 66. 76 www.codership.com Galera Support Codership Level 3 support, Galera MontyProgram Level 3 Support, MariaDB Galera Cluster MariaDB Galera Cluster SkySQL Support Subscriptions
- 67. Questions? Thank you for listening! Happy Clustering :-)