using continuent tungsten to survive mysql failures...using continuent tungsten to survive mysql...

©Continuent 2013

Using Continuent Tungstento Survive MySQL Failures

Je! Mace, Director of Professional Services

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Introduction

• Continuent Tungsten manages large and small MySQL deployments

• Automatic local failover

• Managed failover between datacenters

• Connectivity options for all applications

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Our Customers

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What’s Your Plan?

• Local failover

• Disaster recovery

• Multiple datacenters

• Erroneous SQL statements

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Sources of Instability

• Network instability

• DNS outages

• Hardware degradation and failure

• Memory management

• System administration

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Keeping It Local

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What is a Dataservice?

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• Encapsulate data availability as a service

• React to changes in system status with automatic failover

• Role based access to database servers

• Provide connectivity to the master

• Optionally connect to a slave for reads

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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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Keeping It Local

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Keeping It Local

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Keeping It Local

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Keeping It Local

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• Di!erent connectivity options

• Limit writes to a single server at any time

• Splitting writes introduces inconsistency

• Continuent Tungsten automatically promotes a master and sends tra"c there

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Data Overload

• Promote sharding to support extra large data sets

• Support parallel replication in Q4 2013

• Single customer is supporting ~300TB across 30 Continuent Tungsten dataservices

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Going Global

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Going Global

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• Primary/DR replication allows for backup datacenter without application changes

• True multi-master replication allows for large distributed systems

• Must account for eventual consistency in the application

• Local failover can reduce the e!ects of a single server outage on the global system

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When Replication Works Too Well

• Replication applies all events, even the ones you don’t want

• Delayed replication

• Filtered replication

• Point In Time Recovery (PITR)

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using continuent tungsten to survive mysql failures...using continuent tungsten to survive mysql...

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