An Introduction to Membase

an introduction to

MEMBASE

@tlossen, 2010-08-05

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“simple, fast, elastic”

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overview

• key-value-store

• API-compatible to memcached

- same protocol / client libs

• ‘memcached with persistence’

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status

• developed by NorthScale & Zynga

• used in production (farmville)

• released in June 2010

- Apache 2.0 License

• current version is 1.6 beta 2

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cluster structure

• all nodes are alike

- one elected as “coordinator”

• each node is master for part of key space

- handles all reads & writes

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sharding

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node

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storage

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replication• each vbucket has configurable

number of replicas

• protects against node failure

- quick failover

• master sends updates to replicas asynchronously

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elasticity

• can add nodes at any time

• can remove nodes at any time

- replicas are promoted to master

• rebalancing necessary

• no downtime!

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rebalancing

• initiated manually

• membase calculates new vbucket map

• masters / replicas are migrated to other nodes (as needed)

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deployment

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q & a

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links

• “Membase Unleashed”

- northscale.com/products/resources.html

• membase.org

• github.com/northscale

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