Percona XtraDB Cluster

Transcription

1 Percona XtraDB Cluster Ensure High Availability Presenter Karthik P R CEO Mydbops info@mydbops.com

2 Mydbops Mydbops is into MySQL/MongoDB Support and Consulting. It is founded by experts who have scaled database at Yahoo!,Percona and Datavail. We are providing an expert level support and 24*7 monitoring for MySQL databases and its related technologies like MariaDB, Percona ( also clustering ). We support modern database technologies in MySQL which includes Galera ( Clustering ), Group Replication, SQL aware Load balancers like Maxscale / ProxySQL.

3 Our Clients

4 About Me CEO / DB Architect

5 Table of Contents 1. Native MySQL Replication 2. Percona XtraDB Cluster 3. What is new in XtraDB Cluster? 4. Load Balancing 5. Use Cases 6. Limitations

6 Table of Contents 1. Native MySQL Replication 2. Percona XtraDB Cluster 3. What is new in XtraDB Cluster? 4. Load Balancing 5. Use Cases 6. Limitations

7 Native MySQL Replication One of Best Feature in MySQL from start. Asynchronous in nature. Binary log based replication. Data is streamed between nodes. Works irrespective of MySQL Engine used.

8 Native MySQL Replication Can have any kind of topology and any levels

9 Native MySQL Replication Slaves helps in the read scalability. Asynchronous Replication ( lag ) Data loss and data inconsistency Parallelism. 5.6 = Database level 5.7 = Time based group 8.0 = Writeset ( RC )

10 Native MySQL Replication Replication Switchover and Failover Externals scripts for failover. GTID 5.6 and Orchestrator makes things better. Adding a slave (node) Backup and restore. Manual config of slave coordinates.

11 Table of Contents 1. Native MySQL Replication 2. Percona XtraDB Cluster 3. What is new in XtraDB Cluster? 4. Load Balancing 5. Use Cases 6. Limitations

12 Percona XtraDB Cluster Percona XtraDB Cluster is an active/active high availability and high scalability open source solution for MySQL.Percona XtraDB Cluster 5.7 is MySQL 5.7 compatible Galera-based high availability (HA) solution. Tightly integrated with Xtrabackup and ProxySQL for scalability. Heavily tested for production workload and has a huge share in MySQL clustering solution & Openstack for RDBMS.

13 Percona XtraDB Cluster What is Galera? Galera is a replication plugin for the synchronous replication and multi master replication to achieve High Availability. The read and writes can be made on any node and there is no complex failover solutions. An open source from codership team. What is wsrep? WSREP (Write Set REPlication) is an API to connect the Galera library and control the characteristics of Galera.It helps to implement the Certificate based replication and multi master replication.

14 Percona XtraDB Cluster Features Synchronous Replication ( Virtually ) Parallel applier threads Quorum based Automatic node provisioning Multi master writes PXC Specific features

15 Percona XtraDB Cluster Transaction in Galera

16 Percona XtraDB Cluster Transaction in Galera

17 Percona XtraDB Cluster Percona XtraDB Cluster - Setup Group Communication

18 Percona XtraDB Cluster Parallel Appliers Write set consists only rows to replicate. Any transaction which writes different tuples can be parallelized. wsrep_slave_threads controls parallel threads Application Writes Replication Writes

19 Percona XtraDB Cluster Recovery IST (Incremental State Transfer) Disconnected for maintenance Node crashed SST (State Snapshot Transfer) Joining a new node Node disconnected for a long time

20 Table of Contents 1. Native MySQL Replication 2. Percona XtraDB Cluster 3. What is new in XtraDB Cluster? 4. Load Balancing 5. Use Cases 6. Limitations

21 What is new in XtraDB Cluster? Improved scalability by 10x. Tracking IST Progress Gcache Recovery PXC_Strict_mode Performance Schema for Galera Securing PXC

22 What is new in XtraDB Cluster? Improved XtraDB Cluster Scalability

23 What is new in XtraDB Cluster? IST Improvements

24 What is new in XtraDB Cluster? Gcache Recovery ( Codership ) Gcache can be made to disk with gcache.recover=yes it helps in restoring cache on restore.it saves pains in SST. PXC_strict_mode PXC Strict Mode is designed to avoid the use of experimental and unsupported features in Percona XtraDB Cluster. It includes storage engine checks, Primary key checks, binlog format, Autoinc lock mode and others.

25 Table of Contents 1. Native MySQL Replication 2. Percona XtraDB Cluster 3. What is new in XtraDB Cluster? 4. Load Balancing 5. Use Cases 6. Limitations

26 Load Balancing Load balancer for MySQL HAProxy ( TCP Layer ) Maxscale ( Application Layer ) ProxySQL ( Application Layer ) SQL aware load balancer (application layer), forward the queries/statements by understanding the underlying state of PXC. Read-write split up Automatic Switchover

27 Load Balancing ( ProxySQL ) ProxySQL is light weight Build by René Cannaò GPL V3 License SQL based administration Custom cluster health check script Proxysql-admin for easy configuration. ProxySQL 1.4 comes with inbuilt clustering

28 Load Balancing ( Maxscale ) Maxscale Build by MariaDB File based config Pluggable Router GPL and BSL model Maxscale 1.4 (GPL) Maxscale 2.X (BSL)

29 Table of Contents 1. Native MySQL Replication 2. Percona XtraDB Cluster 3. What is new in XtraDB Cluster? 4. Load Balancing 5. Use Cases 6. Limitations

30 Use cases High Availability Quorum Automated Failover Read Scaling ( No write scaling ) No read-write split required Read throughput increased with nodes WAN Based Replication. Optimized WAN segments

31 Use cases Sample Architecture ( 3 node + 2 node ProxySQL )

32 Table of Contents 1. Native MySQL Replication 2. Percona XtraDB Cluster 3. What is new in XtraDB Cluster? 4. Load Balancing 5. Use Cases 6. Limitations

33 Limitations Supports Only InnoDB Engine. Tables should have Primary Key ( else created internally ) All nodes should have same capacity. Avoid heavier and longer transaction ( OLTP workload ) Schema changes are costly ( use pt-osc ) Needs a Stable and strong network.

34 Resources Percona XtraDB Cluster Official website Percona XtraDB Blogs

35 Contact US: Write to me at DB Consulting Contact : info@mydbops.com Phone : info@mydbops.com