©Continuent 2012.

MySQL High AvailabilityPower and Usability

Giuseppe MaxiaQA Director - Continuent, Inc

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About me• Giuseppe Maxia, a.k.a. The Data Charmer

• Worked in the MySQL team (2006-2010)

• Now QA Director, Continuent, Inc

• Using MySQL since 2001

• Creator and maintainer of MySQL Sandbox

• Community Contributor of the year (2006, 2011)

• Oracle ACE (2011)

• Oracle ACE Director (2012)

• BLOG: http://datacharmer.blogspot.com

A

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ToC

• What a demanding database user wants

• easy switch

• easy and automated failover

• easy recovery

• disaster recovery stand-by site

• easy site switch and failover

• easy site recovery

• What Continuent Tungsten does

• all of the above

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What's an EASY failover

• A failover or switch is EASY if:

• I can promote a slave easily

• I can tell easily the other slaves who is new master

• I can get a failover to happen automatically

• Applications keep working without changes

• Failovers only happen when the server is truly dead

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Translation: What a DB user wants is:

• Transparency

Or

• the ability of using a RESILIENT database system without need to know what's going on

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How a non-HA system works

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App Logic

MySQL Client API

master

slaveslave

load balancer

RR

W

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How a non-HA system works (after a switch)

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App Logic

MySQL Client API

master

slaveslave

load balancer

switch

?

?RR

W

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MasterSlave Slave

App Logic

Tungsten Connector

Replicator Replicator Replicator

App Logic

Tungsten Connector

Manager Manager Manager

Monitoring and control

Monitoring and control

db2 db1 db3

Data Service: sj

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How a Tungsten HA system works

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App Logic

MySQL Client API

load balancerR

R

W

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How a Tungsten HA system works

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App Logic

MySQL Client API

load balancer

switch

W

R

R

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Multiple site demo

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Installation principles

• Install from one location only

• Remote installation of all services

• No partial installations: Either all servers are OK, or none will be installed

• Parallel installation

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What does the installation do

host4

1: Validate all servers

host1 host2 host3

Report all errors

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What does the installation do

host4

1: (again) Validate all servers

host1 host2 host3

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What does the installation do

2: install Tungsten in all servers

host3

$CONTINUENT_HOME/ config/ releases/ backups/ thl/ tungsten/

host4host1

host2

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Installation demo

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Standard HA system demo

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How a "smart scale" Tungsten HA system works

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App Logic MySQL Client APIWRR

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Standard HA "smart scale" system demo

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How a multi site (non HA) system works

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App Logic

MySQL Client API

master

slaveslave

load balancer

RR

W

relay

slaveslave

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How a multi site (non HA) system works

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App Logic

MySQL Client API

master

slaveslave

load balancer

RR

W

relay

slaveslave

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How a multi site (non HA) system works

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master

slaveslave

load balancer

RR

relay

slaveslave

App Logic

MySQL Client API

W

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How a multi-site Tungsten system works

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App Logic

MySQL Client API

W

load balancer

RR

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How a multi-site Tungsten system works

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App Logic

MySQL Client API

W

load balancer

RR

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How a multi-site Tungsten system works

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App Logic

MySQL Client API

W

load balancer

RR

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Parting thoughts

• The key elements of HA are:

• transparency

• ease of use

• Continuent Tungsten

• makes cluster usage transparent

• o!ers automatic failover

• makes cluster management easy

• deals with multiple sites with great ease

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Continuent Website:http://www.continuent.com

Tungsten Replicator 2.0:http://code.google.com/p/tungsten-replicator

Our Blogs:http://scale-out-blog.blogspot.comhttp://datacharmer.blogspot.comhttp://flyingclusters.blogspot.com

560 S. Winchester Blvd., Suite 500 San Jose, CA 95128 Tel +1 (866) 998-3642 Fax +1 (408) 668-1009e-mail: sales@continuent.com

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