MySQL InnoDB Cluster and MySQL Group Replication @HKOSC 2017

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MySQL Group Replication Deep Dive
马楚成 (Ivan Ma)
ivan-cs.ma@oracle.com
2017-06-10

22y
Constant improvements of MySQL as
a relational database.
3
JSON Functions
Stored Procedures
Async Replication
Semi-Sync Replication
Group Replication
Foreign Keys
Performance Schema
Multi-Triggers
Partitioning
Sub-queriesDocument Store
Prepared Statements
R-Trees
B-Trees
Row-based Replication
Plugin API
Event Scheduler
Unicode
Full-Text Search
Enterprise Monitor
WorkbenchInnoDB

Copyright © 2017, Oracle and/or its affiliates. All rights reserved. | 4
Scale-Out
High Performance
Ease-of-Use
Built-in HA
Out-of-Box Solution
Everything Integrated
MySQL
InnoDB
cluster
GA

MySQL Connector
Application
MySQL Router
MySQL Connector
Application
MySQL Router
MySQL Shell
MySQL Connector
Application
MySQL Router
MySQL Connector
Application
MySQL Router
MySQL InnoDB Cluster: High Level Architecture
MySQL
InnoDB
cluster MySQL Enterprise Monitor
…
5

MySQL InnoDB Cluster: Internal Architecture
M
M M
MySQL Connector
Application
MySQL Router
MySQL Connector
Application
MySQL Router
MySQL Shell
HA
Group Replication
6

InnoDB Cluster
7
App Servers with
MySQL Router
MySQL Group Replication
MySQL Shell
Setup, Manage,
Orchestrate
“High Availability becomes a core
first class feature of MySQL!”

MySQL
Group Replication
Natively distributed and highly available replica sets

MySQL Group Replication: What Is It?
• Group Replication library
– Implementation of Replicated Database State Machine
theory
• MySQL GCS is based on our home-grown Paxos implementation
– Provides virtually synchronous replication for MySQL 5.7+
• Guarantees eventual consistency
– Supported on all MySQL platforms
• Linux, Windows, Solaris, OSX, FreeBSD
“Multi-master update anywhere replication plugin for MySQL with
built-in conflict detection and resolution, automatic distributed
recovery, and group membership.”
9
App Servers with
MySQL Router
MySQL Shell
Setup, Manage,
Orchestrate

MySQL Server: Full Stack

MySQL Server: Group Replication Plugin
• The plugin is responsible for
– Maintaining distributed execution context
– Detecting and handling conflicts
– Handling distributed recovery
• Detect membership changes
• Donate state if needed
• Collect state if needed
– Proposing transactions to other members
– Receiving and handling transactions from other
members
– Deciding the ultimate fate of transactions
• commit or rollback
11
GCS API
Replication
Plugin
Plugin API
MySQL
Server
Group Comm.
System (Corosync)
Group Com. Engine

MySQL Server: GCS
• The communication API (and binding) is
responsible for:
– Abstracting the underlying group communication
system implementation from the plugin itself
– Mapping the interface to a specific group
communication system implementation
• The Group Communication System engine:
– Variant of Paxos developed at MySQL
– Building block to provide distributed agreement
between servers
12
GCS API
Replication
Plugin
Plugin API
MySQL
Server
Group Comm.
System (Corosync)
Group Com. Engine

MySQL Router
Transparent application connection routing

MySQL Router
• Transparent client connection routing
– Load balancing
– Application connection failover
• Stateless design offers easy HA client routing
– A local Router becomes part of the application stack
”MySQL Router allows you to easily migrate your standalone MySQL
instances to natively distributed and highly available InnoDB clusters
without affecting existing applications!”
14
Transparent access to HA databases for MySQL Applications
App Servers with
MySQL Router
MySQL Shell
Setup, Manage,
Orchestrate

MySQL Router: 2.1
• Native support for InnoDB clusters
– Understands Group Replication topology
– Utilizes metadata schema stored on each member
• Bootstraps itself and sets up client routing for the InnoDB cluster
• Allows for intelligent client routing into the InnoDB cluster
– Supports multi-master and single primary modes
• Core improvements
– Built-in keyring for easy and secure password management
15
App Servers with
MySQL Router
MySQL Shell
Setup, Manage,
Orchestrate
”MySQL Router 2.1, with the new metadata_cache plugin, provides
transparent client connection routing and failover into your InnoDB clusters!”

MySQL Shell
Single tool for development, setup,
management, orchestration, and monitoring

MySQL Shell
17
A single unified client for all administrative and operations tasks
App Servers with
MySQL Router
MySQL Shell
Setup, Manage,
Orchestrate
• Multi-Language: JavaScript, Python, and SQL
– Naturally scriptable
• Supports both Document and Relational models
• Exposes full Development and Admin API
”MySQL Shell provides the developer and DBA with a single intuitive,
flexible, and powerful interface for all MySQL related tasks!”

MySQL Shell: Admin API
• mysql-js> dba.help()
• The global variable 'dba' is used to access the
MySQL AdminAPI
• Perform DBA operations
– Manage MySQL InnoDB clusters
• Create clusters
• Validate MySQL instances
• Configure MySQL instances
• Get cluster info
• Modify clusters
Database Administration Interface
App Servers with
MySQL Router
MySQL Shell
Setup, Manage,
Orchestrate
18

MySQL Enterprise Monitor
• Native holistic support for Group Replication / InnoDB clusters (GA in 3.4!)
– Topology views
– Detailed metrics and graphs
– Best Practice advice
19
GA

More …
Saturday, December 10, 2016

Demonstration
21
MySQL Shell
MySQL
InnoDB
cluster
Wordpress
MySQL MySQL MySQL
MySQL
Router

MySQL Shell
22

MySQL Shell – dba.help();
23

MySQL Shell – dba.help(‘deploySandboxInstance’);
• dba.deploySandboxInstance(‘3310’);
24
mysql-js> dba.deploySandboxInstance(3310);
A new MySQL sandbox instance will be created on this host in
/home/mysql/mysql-sandboxes/3310
Please enter a MySQL root password for the new instance:
Deploying new MySQL instance...
Instance localhost:3310 successfully deployed and started.
Use shell.connect('root@localhost:3310'); to connect to the instance.

Adding more MySQL Instances
• dba.deploySandboxInstance(3310);
25
mysql-js> dba.checkInstanceConfiguration(3310);
Invalid connection options, expected either a URI or a Dictionary (ArgumentError)
mysql-js> dba.checkInstanceConfiguration('localhost:3310');
Please provide the password for 'root@localhost:3310':
Validating instance...
The instance 'localhost:3310' is valid for Cluster usage
{
"status": "ok"
}

MySQL Shell
Creating the MySQL InnoDB Cluster
• Connecting to Live Instance e.g. mysql-js>connect localhost:3310
• Creating the Cluster e.g. mysql-js>var cluster = dba.createCluster(‘mycluster’)
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mysql-js> c localhost:3310
Creating a Session to 'root@localhost:3310'
Enter password:
Classic Session successfully established. No default schema selected.
mysql-js> var cluster = dba.createCluster('mycluster');
A new InnoDB cluster will be created on instance 'root@localhost:3310'.
Creating InnoDB cluster 'mycluster' on 'root@localhost:3310'...
Adding Seed Instance...
Cluster successfully created. Use Cluster.addInstance() to add MySQL instances.
At least 3 instances are needed for the cluster to be able to withstand up to
one server failure.

MySQL Shell
Checking Cluster’s status and adding new members to the Cluster
27
mysql-js> cluster.addInstance('localhost:3320');
A new instance will be added to the InnoDB cluster. Depending on the
amount of
data on the cluster this might take from a few seconds to several hours.
Adding instance to the cluster ...
The instance 'root@localhost:3320' was successfully added to the
cluster.
mysql-js> cluster.addInstance('localhost:3330');
A new instance will be added to the InnoDB cluster. Depending on the
amount of
data on the cluster this might take from a few seconds to several hours.
Adding instance to the cluster ...
The instance 'root@localhost:3330' was successfully added to the
cluster.

MySQL Shell
dba.configureLocalInstance(uri)
29
mysql-js> dba.configureLocalInstance('localhost:3310');
Detected as sandbox instance.
Validating MySQL configuration file at: /home/mysql/mysql-
sandboxes/3310/my.cnf
You can now use it in an InnoDB Cluster.
{
"status": "ok"
}
mysql-js> dba.configureLocalInstance('localhost:3320');
Detected as sandbox instance.
Validating MySQL configuration file at: /home/mysql/mysql-
sandboxes/3320/my.cnf
You can now use it in an InnoDB Cluster.
{
"status": "ok"
}
mysql-js>

SandboxInstances
• E.g. MySQL configuration file : /home/mysql/mysql-sandboxes/3310/my.cnf
• dba.configureLocalInstance(uri)
– [mysql@virtual-41 3310]$ ll my.cnf*
– -rw------- 1 mysql mysql 2376 May 31 17:04 my.cnf
– -rw-rw-r-- 1 mysql mysql 882 May 31 17:04 my.cnf.20170531-170412
30

Persist configuration - dba.configureLocalInstance(uri)
31

Questions
Thank You

MySQL InnoDB Cluster and MySQL Group Replication @HKOSC 2017

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