Not only SQL

Niklas Gustavssonniklas.gustavsson@callistaenterprise.se@protocol7With thanks to Mårten Gustafson (@martengustafson) for the original presentation

Callista Enterprise | www.callistaenterprise.seNot only SQL

“NoSQL is a movement promoting a loosely defined class of non-relational data stores that break with a long history of relational databases” - Wikipedia

Not a single techniqueNot a single type of dataNot a single type of use case

Non-relationalSchema-less“Easily” scalableREST/JSON API = web friendlyEmphasize P in the CAP theorem

CAP what?

Brewer’s theorem

ConsistencyAvailabilityPartition tolerance

Eventual consistency

Consistency

N = number of nodes to store each data onW=number of nodes for each writeR=number of nodes for each read

R + W > N

What’s out there?

Storage type LicenseImplemented

Amazon Dynamo

Key/Value n/a ?

Cassandra Columnfamily ASL 2.0 Java

CouchDB Document ASL 2.0 Erlang

Dynomite Key/Value BSD/MIT-style Erlang

HBase Columnfamily ASL 2.0 Java

MongoDB Document AGPL v3.0 C++

Neo4J GraphAGPL v3.0 /

CommJava

Riak Key/Value ASL 2.0 Erlang

Redis Key/Value BSD/MIT-style C

Scalaris Key/Value ASL 2.0 Erlang

Tokyo Cabinet Key/Value LGPL C

Voldemort Key/Value ASL 2.0 Java

Distribution

Master / SlaveMaster / Slave(s)Masterless (Master / Master)

DistributionMasterless Master/Slave Hot standby

Amazon Dynamo

Cassandra X

CouchDB X

Dynomite X

HBase ?

MongoDB X X

Neo4J*

Riak X

Redis X

Scalaris X

Tokyo Cabinet

Voldemort X* Neo4J HA coming “soon”

This is

a very simplifi

Common factor

“...of the web...”

Of the who?!

Of the web

“...Django may be built for the Web, but CouchDB is built of the Web. I’ve never seen software that so completely embraces the philosophies behind HTTP. CouchDB makes Django look old-school in the same way that Django makes ASP look outdated”

- http://jacobian.org/writing/of-the-web/

Of the web

“...CouchDB may succeeded, and it may fail; who knows. I’m sure of one thing, though — this is what the software of the future looks like”

- http://jacobian.org/writing/of-the-web/

So freakin’ what?!

All your webish skillz and tools apply...

proxiesload balancers

caches

HTTP client libs (etag, if-modified-since, etc)

language-, platform- and OS-neutral

MIME / Content-Type

These guys can just suck it

HTTP/REST is integration that works

ColumnFamily

Cassandra

Origins at FacebookApache projectThrift API

World view

KeyStore, like a databaseColunmFamily, like a table. Have infinite number of columnsColumn, named, stores binary dataSuperColumn, a column of columnsRow, identified by key, contains columnes No schemaSparse

The Ring

Partitioning

TokenSnitchingPlacement

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Document Store

CouchDB

Document oriented databaseKick ass replicationHTTP/JSON APIMap/reduce view (index) definitions

World view

One document == JSONOne document == One recordMany documents == One databaseMany databases == One instanceNo schema

World view

Documents canhave attachments (binary + mime type)be rendered differently (HTML, XML)

A document

{ "_id": "b098445d587b1f347e48e1a79301de02", "_rev": "1-80bfd8302e0f08eec2396c8107cafc19", "platform": { "browser": "mozilla", "version": "1.9.1.8" }, "timestamp": 1270131033337}

Key, either you Key, either you choose it or choose it or

CouchDB does CouchDB does it for you it for you

Revision Revision numbernumber

FilterCollateAggregate

Views{ "_id": "b098445d587b1f347e48e1a79301de02", "_rev": "1-80bfd8302e0f08eec2396c8107cafc19", "platform": { "browser": "mozilla", "version": "1.9.1.8" }, "timestamp": 1270131033337} +function(doc) { emit(doc.platform.browser, doc.platform.version);} ={ "total_rows": 1, "offset": 0, "rows": [ "id": "b098445d587b1f347e48e1a79301de02", "key": "mozilla", "value": "1.9.1.8" ]}

Views are storedas an accessible web resourceon diskand incrementally updatedas well as replicated with the database

Replication

Peer to peerOnline/OfflineConflict detection and resolutionAny number of nodes

CouchDB - Takeaways

Kick ass replicationViews are fastCan host and serve complete webapps

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Graphs

How to persist a network?

Graph databaseEmbeddedJava (and other languages) APIREST APITraversal and indexes

World view

Nodes and relationshipsTransactional (!)No schema

Traversing

1. Start at a node2. Walk the graph3. Filter nodes4. Decide when to stop

Indexing

Indexing done at insert, or as a batchLucene based indexer for full-text search

Replication

Neo4J HA coming soon, P2P replicationMaster-slave replication

Test one or more NoSQL thingysGet familiar with Brewers CAP theoremGet familiar with the Dynamo paper

Slides/code

Slides: http://www.slideshare.net/protocol7, CC-BY-SA

Code: http://github.com/protocol7

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