MongoDB: What’s new in the 2.5 Java

driver

The Highly Scalable, Enterprise Grade, Open Source Database

Scott Hernandez

New

• URI

• Unified• Basic

• Replicasets

• Better change detection• Name resolution – re-resolve• Map/Reduce

• Inline• Merge• Rereduce

URI

mongodb://host:portmongodb://host:port,host:port?replicaSet=A,slaveOk=true

Options (basic):• slaveOk• replicaSet• safe• w• wtimoutMS• fsync

Replicasets

• Better checking

• Background thread• Add/remove members• Don’t remove if leads to bad state• Support Authentication (with 1.8)• Name (re)resolution every 5min

Map/Reduce

• Inline

• Return in one document (doc size limit)• Merge

• Overwrite existing docs in destination collection

• Rereduce

• Include new and existing docs in reduce phase• Replace all docs in destination collection

Improvements

• Javadocs

• Mongo constructors

• No longer connects; no side effects

• Exception hierarchy

• MongoException root

• Checking max doc size

• Dynamic from server

Breaking changes

• Map/Reduce w/temp collection• Mongo constructors• GridFS metadata field(s)

Questions

scott@10gen.com

Download: http://www.mongodb.com/downloads