NoSQL from Java developer PoV

@_dagi from @gooddata

Tuesday 25 January 2011

NoSQL Experiences

• Few prototypes on top of NoSQL databases

• Voldemort

• CouchDB

• Neo4J

Tuesday 25 January 2011

Tables/Entities

Integration

Log

10...*

ConnectorConnectorConnectorConnectorConnector

1

0...*

Tuesday 25 January 2011

Implementation details

• Java classes

• ORM mapping (Hibernate)

• DDL schema

Tuesday 25 January 2011

What’s wrong• Every new connector

• new Java class

• new mapping

• DDL

• 3rd party libraries

• ~ 5-10

• ORM/Hibernate/Transactions deep knowledge

Tuesday 25 January 2011

What’s wrong

• Every new connector

• new Java class

• new mapping

• DDL

• 3rd party libraries

• ~ 5-10

• ORM/Hibernate/Transactions deep knowledge

Too co

mplicate

d

for sim

ple

usecas

es!

Tuesday 25 January 2011

Make things as simple as possible, but not

simpler.

Tuesday 25 January 2011

CouchDB

• 3 document types

• Integration, Log, Connector

• Schemaless (No DDL)

• Elastic extensibility

• Java bean <=>JSON mapping

• HTTP client

Tuesday 25 January 2011

ORM/RDBMS vs NoSQL

ORM/RDBMS NoSQL

Java model classes Java model classes

JPA mapping JSON mapping

DDL

Hibernate + 3rd libs

ORM deep knowledge Semantic of HTTP methods

SQL/OQL Map/ReduceTuesday 25 January 2011