Java and Mongo

it is….• NoSQL Database• Document based• Cross-platform• Written in C++• BSON (JSON like) - Structure• License: GNU• “Join-less” DB – Performance• Master slave failover – Availability Sharding – Scalability Proprietary & Confidential. © 2012 R/GA All rights reserved. /6

it is….• NoSQL Database• Document based• Cross-platform• Written in C++• BSON (JSON like) - Structure• License: GNU• “Join-less” DB – Improve High Performance• Master slave failover – Improve availability Sharding – Improve scalability Proprietary & Confidential. © 2012 R/GA All rights reserved. /7

it is…. NoSQL DB Document based Database Database A file in your disk Tablespace Collection Bunch of Documents Tables Documents Group of fields Fields Fields String, Integer, Float, name key Timestamp, Binary, Array value value Document (do you remember: joinless?) Proprietary & Confidential. © 2012 R/GA All rights reserved. /8

it is…. Sharding – Improving scalabilitySample Document with 2 fields: first and last Sharding function: Shard1: first=“A* to G* Shard2: first=“H* to M*” Shard3: first=“N* to S*” Shard4: first=“T* to Z*” Proprietary & Confidential. © 2012 R/GA All rights reserved. / 10

it is not….• Query based database• All purpose database• ACID (just between documents at the same hierarchy)• Fixed schema• Unlimited storage database• OLAP – it’s not a DW DB! Proprietary & Confidential. © 2012 R/GA All rights reserved. / 11

BONUS!• 60mi of records• JSON format• Circa 2 hours• 15GB database• Circa 40 min to create an index• Finding • find().count() < 18 milliseconds – first time • find({“area”:”11”, “phone_number”:”88888881”}) Proprietary & Confidential. © 2012 R/GA All rights reserved. / 12

YES you should use it if…..• Fast response for queries (SELECT)• First database• Store Temporary Data• Share data between apps with different flavors (Java, Shell, Javascript - Node.js)• Data Warehouse Cube• File storage (GridFS)• Horizontally scaling – sharding• Web application Proprietary & Confidential. © 2012 R/GA All rights reserved. / 15

YES … examples• Portal Home page• App on Facebook, share data• Delivering content to different clients. • Web browser, iTunes, Mobile, DTV• Delivering content through a Web Server • Storage device, balancing Proprietary & Confidential. © 2012 R/GA All rights reserved. / 16

Not convinced yet? Doubts?• Drivers (Python, Django, Java, Spring, .Net, PHP, Ruby, Rails, Node.js)• Tools •MongoHub - MacOS •Meclipse – Eclipse Plugin •JMongoBrowser – no restrictions• Monitoring •Munin •Cacti •Ganglia• Serving content from Mongo •NGINX and Lighttp Proprietary & Confidential. © 2012 R/GA All rights reserved. / 17

Connecting…. Drivers • Annotation based • Validation JSR303 • Type-safe • DAO<T,V> access abstraction • Easy to implement • Fast • Lightweight • Source code easy to understand Proprietary & Confidential. © 2012 R/GA All rights reserved. / 22

Annotations Class Level• Entity Maps Level Field the class to the collection• Id Can define the namecollection Defines the PK of a of Field Level• Property It’s n ObjectId class collection a field. Defines as param Field level annotation • Serialized Stored in a binary field • Transient Loaded but not stored • NotSaved Not Loaded and not saved Field level annotation • Indexed Create an index with the field Proprietary & Confidential. © 2012 R/GA All rights reserved. / 25

Annotations FK, stores the ObjectID• Entity • Reference• Id Store the Object • Embedded• Property Field level annotation • Serialized Before and After actions • Transient Persisting and Loading • NotSaved • PrePersist • PostPersist Field level annotation • PreLoad • Indexed • PostLoad Proprietary & Confidential. © 2012 R/GA All rights reserved. / 26

Mapping Define a collection: cities Create the PK (ObjectId) Could use @Property to redefine the column name Store the ObjectID from State document outside this Store a list of Neighborhood objects inside the City document Proprietary & Confidential. © 2012 R/GA All rights reserved. / 27

Concluding RemarksJava• Powerful language, powerful VM• Available on Heroku, GAE• JVM BONUS: JRuby, Groovy, ScalaMongoDB• NoSQL – Document Based• Schema-less• JSON like “multi language”• Horizontally scale - Sharding Proprietary & Confidential. © 2012 R/GA All rights reserved. / 33

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Java and Mongo

by Marcio Mangar on Sep 14, 2012

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