CouchBase

A Mini Primer

Agenda

• Brief history
• Feature Overview
• Architecture
• Compare with CouchDB
• See it in action!

Brief History

Features

Key-Value Store

Document Store

Managed Cache

CP or AP?

both

Architecture

Types of Services

• Query Service
  • Query planning, execution and coordination
• Index Service
  • Builds and maintains global secondary indexes
• Data Service
  • Builds and maintains map-reduce views

Indexing

• Map-Reduce views (distributed secondary index)
  • Scatter-and-gather
  • Same semantics as CouchDB
  • No python query server
• Global secondary index
  • Low latency, without compromising mutation performance
• Spatial Views - for geo-spatial data

Querying

• Map-Reduce view
  • Scatter-and-gather, pre-aggregated
  • Javascript M-R function (same as CouchDB)
• Global Secondary Index (GSI)
  • Single-node, JIT-aggregated
  • N1QL (Superset of SQL)
  • Extended SQL construct for JSON manipulation
  • support EXPLAIN

Tunable Durability

• Write to managed cache by default
• Increase durability requirement by using
  • persistTo(number of nodes)
  • replicateTo(number of nodes)
• See the performance impact in demo

Compare with CouchDB

• Both support document storage
  • CouchBase is also a key-value store
• Both have RESTful API
  • CouchBase SDK uses binary protocol by default
• Both support querying by M-R
  • CouchBase also supports SQL-like query lang.
• Out-of-the-box clustering and sharding
• In active development

Demo Time